Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl> |
| 3 | * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl> |
| 4 | * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com> |
Wichert Akkerman | 4dc8a2a | 1999-12-23 14:20:14 +0000 | [diff] [blame] | 5 | * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl> |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. The name of the author may not be used to endorse or promote products |
| 17 | * derived from this software without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 29 | * |
| 30 | * $Id$ |
| 31 | */ |
| 32 | |
| 33 | #include "defs.h" |
| 34 | |
Roland McGrath | 795edb1 | 2005-02-02 04:44:57 +0000 | [diff] [blame] | 35 | #include <sys/types.h> |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 36 | #include <signal.h> |
| 37 | #include <errno.h> |
| 38 | #include <sys/param.h> |
| 39 | #include <fcntl.h> |
| 40 | #include <sys/resource.h> |
| 41 | #include <sys/wait.h> |
| 42 | #include <sys/stat.h> |
| 43 | #include <pwd.h> |
| 44 | #include <grp.h> |
| 45 | #include <string.h> |
John Hughes | 19e4998 | 2001-10-19 08:59:12 +0000 | [diff] [blame] | 46 | #include <limits.h> |
Roland McGrath | 70b0853 | 2004-04-09 00:25:21 +0000 | [diff] [blame] | 47 | #include <dirent.h> |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 48 | |
Roland McGrath | 134813a | 2007-06-02 00:07:33 +0000 | [diff] [blame] | 49 | #ifdef LINUX |
| 50 | # include <asm/unistd.h> |
| 51 | # if defined __NR_tgkill |
| 52 | # define my_tgkill(pid, tid, sig) syscall (__NR_tgkill, (pid), (tid), (sig)) |
| 53 | # elif defined __NR_tkill |
| 54 | # define my_tgkill(pid, tid, sig) syscall (__NR_tkill, (tid), (sig)) |
| 55 | # else |
| 56 | /* kill() may choose arbitrarily the target task of the process group |
| 57 | while we later wait on a that specific TID. PID process waits become |
| 58 | TID task specific waits for a process under ptrace(2). */ |
| 59 | # warning "Neither tkill(2) nor tgkill(2) available, risk of strace hangs!" |
| 60 | # define my_tgkill(pid, tid, sig) kill ((tid), (sig)) |
| 61 | # endif |
| 62 | #endif |
| 63 | |
Wichert Akkerman | 7b3346b | 2001-10-09 23:47:38 +0000 | [diff] [blame] | 64 | #if defined(IA64) && defined(LINUX) |
| 65 | # include <asm/ptrace_offsets.h> |
| 66 | #endif |
| 67 | |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 68 | #ifdef USE_PROCFS |
| 69 | #include <poll.h> |
| 70 | #endif |
| 71 | |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 72 | #ifdef SVR4 |
| 73 | #include <sys/stropts.h> |
Wichert Akkerman | ea78f0f | 1999-11-29 15:34:02 +0000 | [diff] [blame] | 74 | #ifdef HAVE_MP_PROCFS |
John Hughes | 1d08dcf | 2001-07-10 13:48:44 +0000 | [diff] [blame] | 75 | #ifdef HAVE_SYS_UIO_H |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 76 | #include <sys/uio.h> |
| 77 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 78 | #endif |
John Hughes | 1d08dcf | 2001-07-10 13:48:44 +0000 | [diff] [blame] | 79 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 80 | |
Roland McGrath | 41c4822 | 2008-07-18 00:25:10 +0000 | [diff] [blame] | 81 | int debug = 0, followfork = 0; |
Dmitry V. Levin | b9fe011 | 2006-12-13 16:59:44 +0000 | [diff] [blame] | 82 | int dtime = 0, cflag = 0, xflag = 0, qflag = 0; |
| 83 | static int iflag = 0, interactive = 0, pflag_seen = 0, rflag = 0, tflag = 0; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 84 | |
Michal Ludvig | 17f8fb3 | 2002-11-06 13:17:21 +0000 | [diff] [blame] | 85 | /* Sometimes we want to print only succeeding syscalls. */ |
| 86 | int not_failing_only = 0; |
| 87 | |
Dmitry V. Levin | a680965 | 2008-11-10 17:14:58 +0000 | [diff] [blame] | 88 | static int exit_code = 0; |
| 89 | static int strace_child = 0; |
| 90 | |
Dmitry V. Levin | b9fe011 | 2006-12-13 16:59:44 +0000 | [diff] [blame] | 91 | static char *username = NULL; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 92 | uid_t run_uid; |
| 93 | gid_t run_gid; |
| 94 | |
| 95 | int acolumn = DEFAULT_ACOLUMN; |
| 96 | int max_strlen = DEFAULT_STRLEN; |
Dmitry V. Levin | b9fe011 | 2006-12-13 16:59:44 +0000 | [diff] [blame] | 97 | static char *outfname = NULL; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 98 | FILE *outf; |
Roland McGrath | ee9d435 | 2002-12-18 04:16:10 +0000 | [diff] [blame] | 99 | struct tcb **tcbtab; |
| 100 | unsigned int nprocs, tcbtabsize; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 101 | char *progname; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 102 | extern char **environ; |
| 103 | |
Roland McGrath | 0a46388 | 2007-07-05 18:43:16 +0000 | [diff] [blame] | 104 | static int detach P((struct tcb *tcp, int sig)); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 105 | static int trace P((void)); |
| 106 | static void cleanup P((void)); |
| 107 | static void interrupt P((int sig)); |
| 108 | static sigset_t empty_set, blocked_set; |
| 109 | |
| 110 | #ifdef HAVE_SIG_ATOMIC_T |
| 111 | static volatile sig_atomic_t interrupted; |
| 112 | #else /* !HAVE_SIG_ATOMIC_T */ |
| 113 | #ifdef __STDC__ |
| 114 | static volatile int interrupted; |
| 115 | #else /* !__STDC__ */ |
| 116 | static int interrupted; |
| 117 | #endif /* !__STDC__ */ |
| 118 | #endif /* !HAVE_SIG_ATOMIC_T */ |
| 119 | |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 120 | #ifdef USE_PROCFS |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 121 | |
| 122 | static struct tcb *pfd2tcb P((int pfd)); |
| 123 | static void reaper P((int sig)); |
| 124 | static void rebuild_pollv P((void)); |
Roland McGrath | ee9d435 | 2002-12-18 04:16:10 +0000 | [diff] [blame] | 125 | static struct pollfd *pollv; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 126 | |
| 127 | #ifndef HAVE_POLLABLE_PROCFS |
| 128 | |
| 129 | static void proc_poll_open P((void)); |
| 130 | static void proc_poller P((int pfd)); |
| 131 | |
| 132 | struct proc_pollfd { |
| 133 | int fd; |
| 134 | int revents; |
| 135 | int pid; |
| 136 | }; |
| 137 | |
| 138 | static int poller_pid; |
| 139 | static int proc_poll_pipe[2] = { -1, -1 }; |
| 140 | |
| 141 | #endif /* !HAVE_POLLABLE_PROCFS */ |
| 142 | |
Wichert Akkerman | ea78f0f | 1999-11-29 15:34:02 +0000 | [diff] [blame] | 143 | #ifdef HAVE_MP_PROCFS |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 144 | #define POLLWANT POLLWRNORM |
| 145 | #else |
| 146 | #define POLLWANT POLLPRI |
| 147 | #endif |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 148 | #endif /* USE_PROCFS */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 149 | |
| 150 | static void |
| 151 | usage(ofp, exitval) |
| 152 | FILE *ofp; |
| 153 | int exitval; |
| 154 | { |
| 155 | fprintf(ofp, "\ |
| 156 | usage: strace [-dffhiqrtttTvVxx] [-a column] [-e expr] ... [-o file]\n\ |
Roland McGrath | de6e533 | 2003-01-24 04:31:23 +0000 | [diff] [blame] | 157 | [-p pid] ... [-s strsize] [-u username] [-E var=val] ...\n\ |
| 158 | [command [arg ...]]\n\ |
| 159 | or: strace -c [-e expr] ... [-O overhead] [-S sortby] [-E var=val] ...\n\ |
| 160 | [command [arg ...]]\n\ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 161 | -c -- count time, calls, and errors for each syscall and report summary\n\ |
| 162 | -f -- follow forks, -ff -- with output into separate files\n\ |
| 163 | -F -- attempt to follow vforks, -h -- print help message\n\ |
| 164 | -i -- print instruction pointer at time of syscall\n\ |
| 165 | -q -- suppress messages about attaching, detaching, etc.\n\ |
| 166 | -r -- print relative timestamp, -t -- absolute timestamp, -tt -- with usecs\n\ |
| 167 | -T -- print time spent in each syscall, -V -- print version\n\ |
| 168 | -v -- verbose mode: print unabbreviated argv, stat, termio[s], etc. args\n\ |
| 169 | -x -- print non-ascii strings in hex, -xx -- print all strings in hex\n\ |
| 170 | -a column -- alignment COLUMN for printing syscall results (default %d)\n\ |
| 171 | -e expr -- a qualifying expression: option=[!]all or option=[!]val1[,val2]...\n\ |
| 172 | options: trace, abbrev, verbose, raw, signal, read, or write\n\ |
| 173 | -o file -- send trace output to FILE instead of stderr\n\ |
| 174 | -O overhead -- set overhead for tracing syscalls to OVERHEAD usecs\n\ |
| 175 | -p pid -- trace process with process id PID, may be repeated\n\ |
| 176 | -s strsize -- limit length of print strings to STRSIZE chars (default %d)\n\ |
| 177 | -S sortby -- sort syscall counts by: time, calls, name, nothing (default %s)\n\ |
| 178 | -u username -- run command as username handling setuid and/or setgid\n\ |
Roland McGrath | de6e533 | 2003-01-24 04:31:23 +0000 | [diff] [blame] | 179 | -E var=val -- put var=val in the environment for command\n\ |
| 180 | -E var -- remove var from the environment for command\n\ |
| 181 | " /* this is broken, so don't document it |
Michal Ludvig | 17f8fb3 | 2002-11-06 13:17:21 +0000 | [diff] [blame] | 182 | -z -- print only succeeding syscalls\n\ |
Roland McGrath | de6e533 | 2003-01-24 04:31:23 +0000 | [diff] [blame] | 183 | */ |
| 184 | , DEFAULT_ACOLUMN, DEFAULT_STRLEN, DEFAULT_SORTBY); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 185 | exit(exitval); |
| 186 | } |
| 187 | |
| 188 | #ifdef SVR4 |
| 189 | #ifdef MIPS |
| 190 | void |
| 191 | foobar() |
| 192 | { |
| 193 | } |
| 194 | #endif /* MIPS */ |
| 195 | #endif /* SVR4 */ |
| 196 | |
Dmitry V. Levin | 10de62b | 2006-12-13 21:45:31 +0000 | [diff] [blame] | 197 | static int |
| 198 | set_cloexec_flag(int fd) |
| 199 | { |
| 200 | int flags, newflags; |
| 201 | |
| 202 | if ((flags = fcntl(fd, F_GETFD, 0)) < 0) |
| 203 | { |
| 204 | fprintf(stderr, "%s: fcntl F_GETFD: %s\n", |
| 205 | progname, strerror(errno)); |
| 206 | return -1; |
| 207 | } |
| 208 | |
| 209 | newflags = flags | FD_CLOEXEC; |
| 210 | if (flags == newflags) |
| 211 | return 0; |
| 212 | |
| 213 | if (fcntl(fd, F_SETFD, newflags) < 0) |
| 214 | { |
| 215 | fprintf(stderr, "%s: fcntl F_SETFD: %s\n", |
| 216 | progname, strerror(errno)); |
| 217 | return -1; |
| 218 | } |
| 219 | |
| 220 | return 0; |
| 221 | } |
| 222 | |
| 223 | /* |
| 224 | * When strace is setuid executable, we have to swap uids |
| 225 | * before and after filesystem and process management operations. |
| 226 | */ |
| 227 | static void |
| 228 | swap_uid(void) |
| 229 | { |
| 230 | #ifndef SVR4 |
| 231 | int euid = geteuid(), uid = getuid(); |
| 232 | |
| 233 | if (euid != uid && setreuid(euid, uid) < 0) |
| 234 | { |
| 235 | fprintf(stderr, "%s: setreuid: %s\n", |
| 236 | progname, strerror(errno)); |
| 237 | exit(1); |
| 238 | } |
| 239 | #endif |
| 240 | } |
| 241 | |
Roland McGrath | 4bfa626 | 2007-07-05 20:03:16 +0000 | [diff] [blame] | 242 | #if _LFS64_LARGEFILE |
| 243 | # define fopen_for_output fopen64 |
| 244 | #else |
| 245 | # define fopen_for_output fopen |
| 246 | #endif |
| 247 | |
Dmitry V. Levin | 10de62b | 2006-12-13 21:45:31 +0000 | [diff] [blame] | 248 | static FILE * |
| 249 | strace_fopen(const char *path, const char *mode) |
| 250 | { |
| 251 | FILE *fp; |
| 252 | |
| 253 | swap_uid(); |
Roland McGrath | 4bfa626 | 2007-07-05 20:03:16 +0000 | [diff] [blame] | 254 | if ((fp = fopen_for_output(path, mode)) == NULL) |
Dmitry V. Levin | 10de62b | 2006-12-13 21:45:31 +0000 | [diff] [blame] | 255 | fprintf(stderr, "%s: can't fopen '%s': %s\n", |
| 256 | progname, path, strerror(errno)); |
| 257 | swap_uid(); |
| 258 | if (fp && set_cloexec_flag(fileno(fp)) < 0) |
| 259 | { |
| 260 | fclose(fp); |
| 261 | fp = NULL; |
| 262 | } |
| 263 | return fp; |
| 264 | } |
| 265 | |
| 266 | static int popen_pid = -1; |
| 267 | |
| 268 | #ifndef _PATH_BSHELL |
| 269 | # define _PATH_BSHELL "/bin/sh" |
| 270 | #endif |
| 271 | |
| 272 | /* |
| 273 | * We cannot use standard popen(3) here because we have to distinguish |
| 274 | * popen child process from other processes we trace, and standard popen(3) |
| 275 | * does not export its child's pid. |
| 276 | */ |
| 277 | static FILE * |
| 278 | strace_popen(const char *command) |
| 279 | { |
| 280 | int fds[2]; |
| 281 | |
| 282 | swap_uid(); |
| 283 | if (pipe(fds) < 0) |
| 284 | { |
| 285 | fprintf(stderr, "%s: pipe: %s\n", |
| 286 | progname, strerror(errno)); |
| 287 | swap_uid(); |
| 288 | return NULL; |
| 289 | } |
| 290 | |
| 291 | if (set_cloexec_flag(fds[1]) < 0) |
| 292 | { |
| 293 | close(fds[0]); |
| 294 | close(fds[1]); |
| 295 | swap_uid(); |
| 296 | return NULL; |
| 297 | } |
| 298 | |
| 299 | if ((popen_pid = fork()) == -1) |
| 300 | { |
| 301 | fprintf(stderr, "%s: fork: %s\n", |
| 302 | progname, strerror(errno)); |
| 303 | close(fds[0]); |
| 304 | close(fds[1]); |
| 305 | swap_uid(); |
| 306 | return NULL; |
| 307 | } |
| 308 | |
| 309 | if (popen_pid) |
| 310 | { |
| 311 | /* parent */ |
| 312 | close(fds[0]); |
| 313 | swap_uid(); |
| 314 | return fdopen(fds[1], "w"); |
| 315 | } else |
| 316 | { |
| 317 | /* child */ |
| 318 | close(fds[1]); |
| 319 | if (fds[0] && (dup2(fds[0], 0) || close(fds[0]))) |
| 320 | { |
| 321 | fprintf(stderr, "%s: dup2: %s\n", |
| 322 | progname, strerror(errno)); |
| 323 | _exit(1); |
| 324 | } |
| 325 | execl(_PATH_BSHELL, "sh", "-c", command, NULL); |
| 326 | fprintf(stderr, "%s: execl: %s: %s\n", |
| 327 | progname, _PATH_BSHELL, strerror(errno)); |
| 328 | _exit(1); |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | static int |
| 333 | newoutf(struct tcb *tcp) |
| 334 | { |
| 335 | if (outfname && followfork > 1) { |
| 336 | char name[MAXPATHLEN]; |
| 337 | FILE *fp; |
| 338 | |
| 339 | sprintf(name, "%s.%u", outfname, tcp->pid); |
| 340 | if ((fp = strace_fopen(name, "w")) == NULL) |
| 341 | return -1; |
| 342 | tcp->outf = fp; |
| 343 | } |
| 344 | return 0; |
| 345 | } |
| 346 | |
Roland McGrath | 0220331 | 2007-06-11 22:06:31 +0000 | [diff] [blame] | 347 | static void |
| 348 | startup_attach(void) |
| 349 | { |
| 350 | int tcbi; |
| 351 | struct tcb *tcp; |
| 352 | |
| 353 | /* |
| 354 | * Block user interruptions as we would leave the traced |
| 355 | * process stopped (process state T) if we would terminate in |
| 356 | * between PTRACE_ATTACH and wait4 () on SIGSTOP. |
| 357 | * We rely on cleanup () from this point on. |
| 358 | */ |
| 359 | if (interactive) |
| 360 | sigprocmask(SIG_BLOCK, &blocked_set, NULL); |
| 361 | |
| 362 | for (tcbi = 0; tcbi < tcbtabsize; tcbi++) { |
| 363 | tcp = tcbtab[tcbi]; |
| 364 | if (!(tcp->flags & TCB_INUSE) || !(tcp->flags & TCB_ATTACHED)) |
| 365 | continue; |
| 366 | #ifdef LINUX |
| 367 | if (tcp->flags & TCB_CLONE_THREAD) |
| 368 | continue; |
| 369 | #endif |
| 370 | /* Reinitialize the output since it may have changed. */ |
| 371 | tcp->outf = outf; |
| 372 | if (newoutf(tcp) < 0) |
| 373 | exit(1); |
| 374 | |
| 375 | #ifdef USE_PROCFS |
| 376 | if (proc_open(tcp, 1) < 0) { |
| 377 | fprintf(stderr, "trouble opening proc file\n"); |
| 378 | droptcb(tcp); |
| 379 | continue; |
| 380 | } |
| 381 | #else /* !USE_PROCFS */ |
| 382 | # ifdef LINUX |
| 383 | if (followfork) { |
| 384 | char procdir[MAXPATHLEN]; |
| 385 | DIR *dir; |
| 386 | |
| 387 | sprintf(procdir, "/proc/%d/task", tcp->pid); |
| 388 | dir = opendir(procdir); |
| 389 | if (dir != NULL) { |
| 390 | unsigned int ntid = 0, nerr = 0; |
| 391 | struct dirent *de; |
| 392 | int tid; |
| 393 | while ((de = readdir(dir)) != NULL) { |
| 394 | if (de->d_fileno == 0 || |
| 395 | de->d_name[0] == '.') |
| 396 | continue; |
| 397 | tid = atoi(de->d_name); |
| 398 | if (tid <= 0) |
| 399 | continue; |
| 400 | ++ntid; |
| 401 | if (ptrace(PTRACE_ATTACH, tid, |
| 402 | (char *) 1, 0) < 0) |
| 403 | ++nerr; |
| 404 | else if (tid != tcbtab[tcbi]->pid) { |
| 405 | if (nprocs == tcbtabsize && |
| 406 | expand_tcbtab()) |
| 407 | tcp = NULL; |
| 408 | else |
| 409 | tcp = alloctcb(tid); |
| 410 | if (tcp == NULL) |
| 411 | exit(1); |
| 412 | tcp->flags |= TCB_ATTACHED|TCB_CLONE_THREAD|TCB_CLONE_DETACHED|TCB_FOLLOWFORK; |
| 413 | tcbtab[tcbi]->nchildren++; |
| 414 | tcbtab[tcbi]->nclone_threads++; |
| 415 | tcbtab[tcbi]->nclone_detached++; |
| 416 | tcp->parent = tcbtab[tcbi]; |
| 417 | } |
| 418 | if (interactive) { |
| 419 | sigprocmask(SIG_SETMASK, &empty_set, NULL); |
| 420 | if (interrupted) |
| 421 | return; |
| 422 | sigprocmask(SIG_BLOCK, &blocked_set, NULL); |
| 423 | } |
| 424 | } |
| 425 | closedir(dir); |
| 426 | if (nerr == ntid) { |
| 427 | perror("attach: ptrace(PTRACE_ATTACH, ...)"); |
| 428 | droptcb(tcp); |
| 429 | continue; |
| 430 | } |
| 431 | if (!qflag) { |
| 432 | ntid -= nerr; |
| 433 | if (ntid > 1) |
| 434 | fprintf(stderr, "\ |
| 435 | Process %u attached with %u threads - interrupt to quit\n", |
| 436 | tcp->pid, ntid); |
| 437 | else |
| 438 | fprintf(stderr, "\ |
| 439 | Process %u attached - interrupt to quit\n", |
| 440 | tcp->pid); |
| 441 | } |
| 442 | continue; |
| 443 | } |
| 444 | } |
| 445 | # endif |
| 446 | if (ptrace(PTRACE_ATTACH, tcp->pid, (char *) 1, 0) < 0) { |
| 447 | perror("attach: ptrace(PTRACE_ATTACH, ...)"); |
| 448 | droptcb(tcp); |
| 449 | continue; |
| 450 | } |
| 451 | /* INTERRUPTED is going to be checked at the top of TRACE. */ |
| 452 | #endif /* !USE_PROCFS */ |
| 453 | if (!qflag) |
| 454 | fprintf(stderr, |
| 455 | "Process %u attached - interrupt to quit\n", |
| 456 | tcp->pid); |
| 457 | } |
| 458 | |
| 459 | if (interactive) |
| 460 | sigprocmask(SIG_SETMASK, &empty_set, NULL); |
| 461 | } |
| 462 | |
| 463 | static void |
| 464 | startup_child (char **argv) |
| 465 | { |
| 466 | struct stat statbuf; |
| 467 | const char *filename; |
| 468 | char pathname[MAXPATHLEN]; |
| 469 | int pid = 0; |
| 470 | struct tcb *tcp; |
| 471 | |
| 472 | filename = argv[0]; |
| 473 | if (strchr(filename, '/')) { |
| 474 | if (strlen(filename) > sizeof pathname - 1) { |
| 475 | errno = ENAMETOOLONG; |
| 476 | perror("strace: exec"); |
| 477 | exit(1); |
| 478 | } |
| 479 | strcpy(pathname, filename); |
| 480 | } |
| 481 | #ifdef USE_DEBUGGING_EXEC |
| 482 | /* |
| 483 | * Debuggers customarily check the current directory |
| 484 | * first regardless of the path but doing that gives |
| 485 | * security geeks a panic attack. |
| 486 | */ |
| 487 | else if (stat(filename, &statbuf) == 0) |
| 488 | strcpy(pathname, filename); |
| 489 | #endif /* USE_DEBUGGING_EXEC */ |
| 490 | else { |
| 491 | char *path; |
| 492 | int m, n, len; |
| 493 | |
| 494 | for (path = getenv("PATH"); path && *path; path += m) { |
| 495 | if (strchr(path, ':')) { |
| 496 | n = strchr(path, ':') - path; |
| 497 | m = n + 1; |
| 498 | } |
| 499 | else |
| 500 | m = n = strlen(path); |
| 501 | if (n == 0) { |
| 502 | if (!getcwd(pathname, MAXPATHLEN)) |
| 503 | continue; |
| 504 | len = strlen(pathname); |
| 505 | } |
| 506 | else if (n > sizeof pathname - 1) |
| 507 | continue; |
| 508 | else { |
| 509 | strncpy(pathname, path, n); |
| 510 | len = n; |
| 511 | } |
| 512 | if (len && pathname[len - 1] != '/') |
| 513 | pathname[len++] = '/'; |
| 514 | strcpy(pathname + len, filename); |
| 515 | if (stat(pathname, &statbuf) == 0 && |
| 516 | /* Accept only regular files |
| 517 | with some execute bits set. |
| 518 | XXX not perfect, might still fail */ |
| 519 | S_ISREG(statbuf.st_mode) && |
| 520 | (statbuf.st_mode & 0111)) |
| 521 | break; |
| 522 | } |
| 523 | } |
| 524 | if (stat(pathname, &statbuf) < 0) { |
| 525 | fprintf(stderr, "%s: %s: command not found\n", |
| 526 | progname, filename); |
| 527 | exit(1); |
| 528 | } |
Dmitry V. Levin | a680965 | 2008-11-10 17:14:58 +0000 | [diff] [blame] | 529 | strace_child = pid = fork(); |
| 530 | switch (pid) { |
Roland McGrath | 0220331 | 2007-06-11 22:06:31 +0000 | [diff] [blame] | 531 | case -1: |
| 532 | perror("strace: fork"); |
| 533 | cleanup(); |
| 534 | exit(1); |
| 535 | break; |
| 536 | case 0: { |
| 537 | #ifdef USE_PROCFS |
| 538 | if (outf != stderr) close (fileno (outf)); |
| 539 | #ifdef MIPS |
| 540 | /* Kludge for SGI, see proc_open for details. */ |
| 541 | sa.sa_handler = foobar; |
| 542 | sa.sa_flags = 0; |
| 543 | sigemptyset(&sa.sa_mask); |
| 544 | sigaction(SIGINT, &sa, NULL); |
| 545 | #endif /* MIPS */ |
| 546 | #ifndef FREEBSD |
| 547 | pause(); |
| 548 | #else /* FREEBSD */ |
| 549 | kill(getpid(), SIGSTOP); /* stop HERE */ |
| 550 | #endif /* FREEBSD */ |
| 551 | #else /* !USE_PROCFS */ |
| 552 | if (outf!=stderr) |
| 553 | close(fileno (outf)); |
| 554 | |
| 555 | if (ptrace(PTRACE_TRACEME, 0, (char *) 1, 0) < 0) { |
| 556 | perror("strace: ptrace(PTRACE_TRACEME, ...)"); |
| 557 | exit(1); |
| 558 | } |
| 559 | if (debug) |
| 560 | kill(getpid(), SIGSTOP); |
| 561 | |
| 562 | if (username != NULL || geteuid() == 0) { |
| 563 | uid_t run_euid = run_uid; |
| 564 | gid_t run_egid = run_gid; |
| 565 | |
| 566 | if (statbuf.st_mode & S_ISUID) |
| 567 | run_euid = statbuf.st_uid; |
| 568 | if (statbuf.st_mode & S_ISGID) |
| 569 | run_egid = statbuf.st_gid; |
| 570 | |
| 571 | /* |
| 572 | * It is important to set groups before we |
| 573 | * lose privileges on setuid. |
| 574 | */ |
| 575 | if (username != NULL) { |
| 576 | if (initgroups(username, run_gid) < 0) { |
| 577 | perror("initgroups"); |
| 578 | exit(1); |
| 579 | } |
| 580 | if (setregid(run_gid, run_egid) < 0) { |
| 581 | perror("setregid"); |
| 582 | exit(1); |
| 583 | } |
| 584 | if (setreuid(run_uid, run_euid) < 0) { |
| 585 | perror("setreuid"); |
| 586 | exit(1); |
| 587 | } |
| 588 | } |
| 589 | } |
| 590 | else |
| 591 | setreuid(run_uid, run_uid); |
| 592 | |
| 593 | /* |
| 594 | * Induce an immediate stop so that the parent |
| 595 | * will resume us with PTRACE_SYSCALL and display |
| 596 | * this execve call normally. |
| 597 | */ |
| 598 | kill(getpid(), SIGSTOP); |
| 599 | #endif /* !USE_PROCFS */ |
| 600 | |
| 601 | execv(pathname, argv); |
| 602 | perror("strace: exec"); |
| 603 | _exit(1); |
| 604 | break; |
| 605 | } |
| 606 | default: |
| 607 | if ((tcp = alloctcb(pid)) == NULL) { |
| 608 | cleanup(); |
| 609 | exit(1); |
| 610 | } |
| 611 | #ifdef USE_PROCFS |
| 612 | if (proc_open(tcp, 0) < 0) { |
| 613 | fprintf(stderr, "trouble opening proc file\n"); |
| 614 | cleanup(); |
| 615 | exit(1); |
| 616 | } |
| 617 | #endif /* USE_PROCFS */ |
| 618 | break; |
| 619 | } |
| 620 | } |
| 621 | |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 622 | int |
Dmitry V. Levin | 08b623e | 2007-10-08 21:04:41 +0000 | [diff] [blame] | 623 | main(int argc, char *argv[]) |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 624 | { |
| 625 | extern int optind; |
| 626 | extern char *optarg; |
| 627 | struct tcb *tcp; |
| 628 | int c, pid = 0; |
Dmitry V. Levin | 06350db | 2008-07-25 15:42:34 +0000 | [diff] [blame] | 629 | int optF = 0; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 630 | struct sigaction sa; |
| 631 | |
| 632 | static char buf[BUFSIZ]; |
| 633 | |
Dmitry V. Levin | 08b623e | 2007-10-08 21:04:41 +0000 | [diff] [blame] | 634 | progname = argv[0] ? argv[0] : "strace"; |
| 635 | |
Roland McGrath | ee9d435 | 2002-12-18 04:16:10 +0000 | [diff] [blame] | 636 | /* Allocate the initial tcbtab. */ |
| 637 | tcbtabsize = argc; /* Surely enough for all -p args. */ |
Dmitry V. Levin | 08b623e | 2007-10-08 21:04:41 +0000 | [diff] [blame] | 638 | if ((tcbtab = calloc (tcbtabsize, sizeof tcbtab[0])) == NULL) { |
| 639 | fprintf(stderr, "%s: out of memory\n", progname); |
| 640 | exit(1); |
| 641 | } |
| 642 | if ((tcbtab[0] = calloc (tcbtabsize, sizeof tcbtab[0][0])) == NULL) { |
| 643 | fprintf(stderr, "%s: out of memory\n", progname); |
| 644 | exit(1); |
| 645 | } |
Roland McGrath | ee9d435 | 2002-12-18 04:16:10 +0000 | [diff] [blame] | 646 | for (tcp = tcbtab[0]; tcp < &tcbtab[0][tcbtabsize]; ++tcp) |
| 647 | tcbtab[tcp - tcbtab[0]] = &tcbtab[0][tcp - tcbtab[0]]; |
| 648 | |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 649 | outf = stderr; |
| 650 | interactive = 1; |
Roland McGrath | 138c6a3 | 2006-01-12 09:50:49 +0000 | [diff] [blame] | 651 | set_sortby(DEFAULT_SORTBY); |
| 652 | set_personality(DEFAULT_PERSONALITY); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 653 | qualify("trace=all"); |
| 654 | qualify("abbrev=all"); |
| 655 | qualify("verbose=all"); |
| 656 | qualify("signal=all"); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 657 | while ((c = getopt(argc, argv, |
Roland McGrath | de6e533 | 2003-01-24 04:31:23 +0000 | [diff] [blame] | 658 | "+cdfFhiqrtTvVxza:e:o:O:p:s:S:u:E:")) != EOF) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 659 | switch (c) { |
| 660 | case 'c': |
| 661 | cflag++; |
| 662 | dtime++; |
| 663 | break; |
| 664 | case 'd': |
| 665 | debug++; |
| 666 | break; |
Roland McGrath | 41c4822 | 2008-07-18 00:25:10 +0000 | [diff] [blame] | 667 | case 'F': |
Dmitry V. Levin | 06350db | 2008-07-25 15:42:34 +0000 | [diff] [blame] | 668 | optF = 1; |
| 669 | break; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 670 | case 'f': |
| 671 | followfork++; |
| 672 | break; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 673 | case 'h': |
| 674 | usage(stdout, 0); |
| 675 | break; |
| 676 | case 'i': |
| 677 | iflag++; |
| 678 | break; |
| 679 | case 'q': |
| 680 | qflag++; |
| 681 | break; |
| 682 | case 'r': |
| 683 | rflag++; |
| 684 | tflag++; |
| 685 | break; |
| 686 | case 't': |
| 687 | tflag++; |
| 688 | break; |
| 689 | case 'T': |
| 690 | dtime++; |
| 691 | break; |
| 692 | case 'x': |
| 693 | xflag++; |
| 694 | break; |
| 695 | case 'v': |
| 696 | qualify("abbrev=none"); |
| 697 | break; |
| 698 | case 'V': |
Roland McGrath | 9c9a253 | 2003-02-20 02:56:29 +0000 | [diff] [blame] | 699 | printf("%s -- version %s\n", PACKAGE_NAME, VERSION); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 700 | exit(0); |
| 701 | break; |
Michal Ludvig | 17f8fb3 | 2002-11-06 13:17:21 +0000 | [diff] [blame] | 702 | case 'z': |
| 703 | not_failing_only = 1; |
| 704 | break; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 705 | case 'a': |
| 706 | acolumn = atoi(optarg); |
| 707 | break; |
| 708 | case 'e': |
| 709 | qualify(optarg); |
| 710 | break; |
| 711 | case 'o': |
| 712 | outfname = strdup(optarg); |
| 713 | break; |
| 714 | case 'O': |
| 715 | set_overhead(atoi(optarg)); |
| 716 | break; |
| 717 | case 'p': |
Roland McGrath | de6e533 | 2003-01-24 04:31:23 +0000 | [diff] [blame] | 718 | if ((pid = atoi(optarg)) <= 0) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 719 | fprintf(stderr, "%s: Invalid process id: %s\n", |
| 720 | progname, optarg); |
| 721 | break; |
| 722 | } |
| 723 | if (pid == getpid()) { |
Wichert Akkerman | 54a4767 | 1999-10-17 00:57:34 +0000 | [diff] [blame] | 724 | fprintf(stderr, "%s: I'm sorry, I can't let you do that, Dave.\n", progname); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 725 | break; |
| 726 | } |
Dmitry V. Levin | 10de62b | 2006-12-13 21:45:31 +0000 | [diff] [blame] | 727 | if ((tcp = alloc_tcb(pid, 0)) == NULL) { |
Roland McGrath | de6e533 | 2003-01-24 04:31:23 +0000 | [diff] [blame] | 728 | fprintf(stderr, "%s: out of memory\n", |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 729 | progname); |
| 730 | exit(1); |
| 731 | } |
| 732 | tcp->flags |= TCB_ATTACHED; |
| 733 | pflag_seen++; |
| 734 | break; |
| 735 | case 's': |
| 736 | max_strlen = atoi(optarg); |
Roland McGrath | dccec72 | 2005-05-09 07:45:47 +0000 | [diff] [blame] | 737 | if (max_strlen < 0) { |
| 738 | fprintf(stderr, |
| 739 | "%s: invalid -s argument: %s\n", |
| 740 | progname, optarg); |
| 741 | exit(1); |
| 742 | } |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 743 | break; |
| 744 | case 'S': |
| 745 | set_sortby(optarg); |
| 746 | break; |
| 747 | case 'u': |
| 748 | username = strdup(optarg); |
| 749 | break; |
Roland McGrath | de6e533 | 2003-01-24 04:31:23 +0000 | [diff] [blame] | 750 | case 'E': |
| 751 | if (putenv(optarg) < 0) { |
| 752 | fprintf(stderr, "%s: out of memory\n", |
| 753 | progname); |
| 754 | exit(1); |
| 755 | } |
| 756 | break; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 757 | default: |
| 758 | usage(stderr, 1); |
| 759 | break; |
| 760 | } |
| 761 | } |
| 762 | |
Roland McGrath | d0c4c0c | 2006-04-25 07:39:40 +0000 | [diff] [blame] | 763 | if ((optind == argc) == !pflag_seen) |
Roland McGrath | ce0d154 | 2003-11-11 21:24:23 +0000 | [diff] [blame] | 764 | usage(stderr, 1); |
| 765 | |
Dmitry V. Levin | 06350db | 2008-07-25 15:42:34 +0000 | [diff] [blame] | 766 | if (!followfork) |
| 767 | followfork = optF; |
| 768 | |
Roland McGrath | cb9def6 | 2006-04-25 07:48:03 +0000 | [diff] [blame] | 769 | if (followfork > 1 && cflag) { |
| 770 | fprintf(stderr, |
| 771 | "%s: -c and -ff are mutually exclusive options\n", |
| 772 | progname); |
| 773 | exit(1); |
| 774 | } |
| 775 | |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 776 | /* See if they want to run as another user. */ |
| 777 | if (username != NULL) { |
| 778 | struct passwd *pent; |
| 779 | |
| 780 | if (getuid() != 0 || geteuid() != 0) { |
| 781 | fprintf(stderr, |
| 782 | "%s: you must be root to use the -u option\n", |
| 783 | progname); |
| 784 | exit(1); |
| 785 | } |
| 786 | if ((pent = getpwnam(username)) == NULL) { |
| 787 | fprintf(stderr, "%s: cannot find user `%s'\n", |
Roland McGrath | 09553f8 | 2007-07-05 19:31:49 +0000 | [diff] [blame] | 788 | progname, username); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 789 | exit(1); |
| 790 | } |
| 791 | run_uid = pent->pw_uid; |
| 792 | run_gid = pent->pw_gid; |
| 793 | } |
| 794 | else { |
| 795 | run_uid = getuid(); |
| 796 | run_gid = getgid(); |
| 797 | } |
| 798 | |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 799 | /* Check if they want to redirect the output. */ |
| 800 | if (outfname) { |
Roland McGrath | 37b9a66 | 2003-11-07 02:26:54 +0000 | [diff] [blame] | 801 | /* See if they want to pipe the output. */ |
| 802 | if (outfname[0] == '|' || outfname[0] == '!') { |
| 803 | /* |
| 804 | * We can't do the <outfname>.PID funny business |
| 805 | * when using popen, so prohibit it. |
| 806 | */ |
| 807 | if (followfork > 1) { |
| 808 | fprintf(stderr, "\ |
| 809 | %s: piping the output and -ff are mutually exclusive options\n", |
| 810 | progname); |
| 811 | exit(1); |
| 812 | } |
| 813 | |
Dmitry V. Levin | 10de62b | 2006-12-13 21:45:31 +0000 | [diff] [blame] | 814 | if ((outf = strace_popen(outfname + 1)) == NULL) |
Roland McGrath | 37b9a66 | 2003-11-07 02:26:54 +0000 | [diff] [blame] | 815 | exit(1); |
Roland McGrath | 37b9a66 | 2003-11-07 02:26:54 +0000 | [diff] [blame] | 816 | } |
Dmitry V. Levin | 10de62b | 2006-12-13 21:45:31 +0000 | [diff] [blame] | 817 | else if (followfork <= 1 && |
| 818 | (outf = strace_fopen(outfname, "w")) == NULL) |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 819 | exit(1); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 820 | } |
| 821 | |
Roland McGrath | 37b9a66 | 2003-11-07 02:26:54 +0000 | [diff] [blame] | 822 | if (!outfname || outfname[0] == '|' || outfname[0] == '!') |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 823 | setvbuf(outf, buf, _IOLBF, BUFSIZ); |
Roland McGrath | 37b9a66 | 2003-11-07 02:26:54 +0000 | [diff] [blame] | 824 | if (outfname && optind < argc) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 825 | interactive = 0; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 826 | qflag = 1; |
Roland McGrath | 3693105 | 2003-06-03 01:35:20 +0000 | [diff] [blame] | 827 | } |
Roland McGrath | 54cc1c8 | 2007-11-03 23:34:11 +0000 | [diff] [blame] | 828 | /* Valid states here: |
| 829 | optind < argc pflag_seen outfname interactive |
| 830 | 1 0 0 1 |
| 831 | 0 1 0 1 |
| 832 | 1 0 1 0 |
| 833 | 0 1 1 1 |
| 834 | */ |
| 835 | |
| 836 | /* STARTUP_CHILD must be called before the signal handlers get |
| 837 | installed below as they are inherited into the spawned process. |
| 838 | Also we do not need to be protected by them as during interruption |
| 839 | in the STARTUP_CHILD mode we kill the spawned process anyway. */ |
| 840 | if (!pflag_seen) |
| 841 | startup_child(&argv[optind]); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 842 | |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 843 | sigemptyset(&empty_set); |
| 844 | sigemptyset(&blocked_set); |
| 845 | sa.sa_handler = SIG_IGN; |
| 846 | sigemptyset(&sa.sa_mask); |
| 847 | sa.sa_flags = 0; |
| 848 | sigaction(SIGTTOU, &sa, NULL); |
| 849 | sigaction(SIGTTIN, &sa, NULL); |
| 850 | if (interactive) { |
| 851 | sigaddset(&blocked_set, SIGHUP); |
| 852 | sigaddset(&blocked_set, SIGINT); |
| 853 | sigaddset(&blocked_set, SIGQUIT); |
| 854 | sigaddset(&blocked_set, SIGPIPE); |
| 855 | sigaddset(&blocked_set, SIGTERM); |
| 856 | sa.sa_handler = interrupt; |
| 857 | #ifdef SUNOS4 |
| 858 | /* POSIX signals on sunos4.1 are a little broken. */ |
| 859 | sa.sa_flags = SA_INTERRUPT; |
| 860 | #endif /* SUNOS4 */ |
| 861 | } |
| 862 | sigaction(SIGHUP, &sa, NULL); |
| 863 | sigaction(SIGINT, &sa, NULL); |
| 864 | sigaction(SIGQUIT, &sa, NULL); |
| 865 | sigaction(SIGPIPE, &sa, NULL); |
| 866 | sigaction(SIGTERM, &sa, NULL); |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 867 | #ifdef USE_PROCFS |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 868 | sa.sa_handler = reaper; |
| 869 | sigaction(SIGCHLD, &sa, NULL); |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 870 | #else |
| 871 | /* Make sure SIGCHLD has the default action so that waitpid |
| 872 | definitely works without losing track of children. The user |
| 873 | should not have given us a bogus state to inherit, but he might |
| 874 | have. Arguably we should detect SIG_IGN here and pass it on |
| 875 | to children, but probably noone really needs that. */ |
| 876 | sa.sa_handler = SIG_DFL; |
| 877 | sigaction(SIGCHLD, &sa, NULL); |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 878 | #endif /* USE_PROCFS */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 879 | |
Roland McGrath | 0220331 | 2007-06-11 22:06:31 +0000 | [diff] [blame] | 880 | if (pflag_seen) |
| 881 | startup_attach(); |
Roland McGrath | 0220331 | 2007-06-11 22:06:31 +0000 | [diff] [blame] | 882 | |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 883 | if (trace() < 0) |
| 884 | exit(1); |
| 885 | cleanup(); |
Dmitry V. Levin | a680965 | 2008-11-10 17:14:58 +0000 | [diff] [blame] | 886 | fflush(NULL); |
| 887 | if (exit_code > 0xff) { |
| 888 | /* Child was killed by a signal, mimic that. */ |
| 889 | exit_code &= 0xff; |
| 890 | signal(exit_code, SIG_DFL); |
| 891 | raise(exit_code); |
| 892 | /* Paranoia - what if this signal is not fatal? |
| 893 | Exit with 128 + signo then. */ |
| 894 | exit_code += 128; |
| 895 | } |
| 896 | exit(exit_code); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 897 | } |
| 898 | |
Roland McGrath | 7b54a7a | 2004-06-04 01:50:45 +0000 | [diff] [blame] | 899 | int |
| 900 | expand_tcbtab() |
| 901 | { |
| 902 | /* Allocate some more TCBs and expand the table. |
| 903 | We don't want to relocate the TCBs because our |
| 904 | callers have pointers and it would be a pain. |
| 905 | So tcbtab is a table of pointers. Since we never |
| 906 | free the TCBs, we allocate a single chunk of many. */ |
| 907 | struct tcb **newtab = (struct tcb **) |
| 908 | realloc(tcbtab, 2 * tcbtabsize * sizeof tcbtab[0]); |
| 909 | struct tcb *newtcbs = (struct tcb *) calloc(tcbtabsize, |
| 910 | sizeof *newtcbs); |
| 911 | int i; |
| 912 | if (newtab == NULL || newtcbs == NULL) { |
| 913 | if (newtab != NULL) |
| 914 | free(newtab); |
Dmitry V. Levin | 76860f6 | 2006-10-11 22:55:25 +0000 | [diff] [blame] | 915 | fprintf(stderr, "%s: expand_tcbtab: out of memory\n", |
| 916 | progname); |
Roland McGrath | 7b54a7a | 2004-06-04 01:50:45 +0000 | [diff] [blame] | 917 | return 1; |
| 918 | } |
| 919 | for (i = tcbtabsize; i < 2 * tcbtabsize; ++i) |
| 920 | newtab[i] = &newtcbs[i - tcbtabsize]; |
| 921 | tcbtabsize *= 2; |
| 922 | tcbtab = newtab; |
| 923 | |
| 924 | return 0; |
| 925 | } |
| 926 | |
| 927 | |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 928 | struct tcb * |
Dmitry V. Levin | 10de62b | 2006-12-13 21:45:31 +0000 | [diff] [blame] | 929 | alloc_tcb(int pid, int command_options_parsed) |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 930 | { |
| 931 | int i; |
| 932 | struct tcb *tcp; |
| 933 | |
Roland McGrath | ee9d435 | 2002-12-18 04:16:10 +0000 | [diff] [blame] | 934 | for (i = 0; i < tcbtabsize; i++) { |
| 935 | tcp = tcbtab[i]; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 936 | if ((tcp->flags & TCB_INUSE) == 0) { |
| 937 | tcp->pid = pid; |
| 938 | tcp->parent = NULL; |
| 939 | tcp->nchildren = 0; |
Roland McGrath | 0962345 | 2003-05-23 02:27:13 +0000 | [diff] [blame] | 940 | tcp->nzombies = 0; |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 941 | #ifdef TCB_CLONE_THREAD |
| 942 | tcp->nclone_threads = tcp->nclone_detached = 0; |
| 943 | tcp->nclone_waiting = 0; |
| 944 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 945 | tcp->flags = TCB_INUSE | TCB_STARTUP; |
| 946 | tcp->outf = outf; /* Initialise to current out file */ |
| 947 | tcp->stime.tv_sec = 0; |
| 948 | tcp->stime.tv_usec = 0; |
| 949 | tcp->pfd = -1; |
| 950 | nprocs++; |
Dmitry V. Levin | 10de62b | 2006-12-13 21:45:31 +0000 | [diff] [blame] | 951 | if (command_options_parsed) |
| 952 | newoutf(tcp); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 953 | return tcp; |
| 954 | } |
| 955 | } |
Dmitry V. Levin | 10de62b | 2006-12-13 21:45:31 +0000 | [diff] [blame] | 956 | fprintf(stderr, "%s: alloc_tcb: tcb table full\n", progname); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 957 | return NULL; |
| 958 | } |
| 959 | |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 960 | #ifdef USE_PROCFS |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 961 | int |
| 962 | proc_open(tcp, attaching) |
| 963 | struct tcb *tcp; |
| 964 | int attaching; |
| 965 | { |
| 966 | char proc[32]; |
| 967 | long arg; |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 968 | #ifdef SVR4 |
John Hughes | 19e4998 | 2001-10-19 08:59:12 +0000 | [diff] [blame] | 969 | int i; |
| 970 | sysset_t syscalls; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 971 | sigset_t signals; |
| 972 | fltset_t faults; |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 973 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 974 | #ifndef HAVE_POLLABLE_PROCFS |
| 975 | static int last_pfd; |
| 976 | #endif |
| 977 | |
Wichert Akkerman | ea78f0f | 1999-11-29 15:34:02 +0000 | [diff] [blame] | 978 | #ifdef HAVE_MP_PROCFS |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 979 | /* Open the process pseudo-files in /proc. */ |
| 980 | sprintf(proc, "/proc/%d/ctl", tcp->pid); |
| 981 | if ((tcp->pfd = open(proc, O_WRONLY|O_EXCL)) < 0) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 982 | perror("strace: open(\"/proc/...\", ...)"); |
| 983 | return -1; |
| 984 | } |
Dmitry V. Levin | 10de62b | 2006-12-13 21:45:31 +0000 | [diff] [blame] | 985 | if (set_cloexec_flag(tcp->pfd) < 0) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 986 | return -1; |
| 987 | } |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 988 | sprintf(proc, "/proc/%d/status", tcp->pid); |
| 989 | if ((tcp->pfd_stat = open(proc, O_RDONLY|O_EXCL)) < 0) { |
| 990 | perror("strace: open(\"/proc/...\", ...)"); |
| 991 | return -1; |
| 992 | } |
Dmitry V. Levin | 10de62b | 2006-12-13 21:45:31 +0000 | [diff] [blame] | 993 | if (set_cloexec_flag(tcp->pfd_stat) < 0) { |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 994 | return -1; |
| 995 | } |
| 996 | sprintf(proc, "/proc/%d/as", tcp->pid); |
| 997 | if ((tcp->pfd_as = open(proc, O_RDONLY|O_EXCL)) < 0) { |
| 998 | perror("strace: open(\"/proc/...\", ...)"); |
| 999 | return -1; |
| 1000 | } |
Dmitry V. Levin | 10de62b | 2006-12-13 21:45:31 +0000 | [diff] [blame] | 1001 | if (set_cloexec_flag(tcp->pfd_as) < 0) { |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1002 | return -1; |
| 1003 | } |
| 1004 | #else |
| 1005 | /* Open the process pseudo-file in /proc. */ |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1006 | #ifndef FREEBSD |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1007 | sprintf(proc, "/proc/%d", tcp->pid); |
| 1008 | if ((tcp->pfd = open(proc, O_RDWR|O_EXCL)) < 0) { |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1009 | #else /* FREEBSD */ |
| 1010 | sprintf(proc, "/proc/%d/mem", tcp->pid); |
| 1011 | if ((tcp->pfd = open(proc, O_RDWR)) < 0) { |
| 1012 | #endif /* FREEBSD */ |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1013 | perror("strace: open(\"/proc/...\", ...)"); |
| 1014 | return -1; |
| 1015 | } |
Dmitry V. Levin | 10de62b | 2006-12-13 21:45:31 +0000 | [diff] [blame] | 1016 | if (set_cloexec_flag(tcp->pfd) < 0) { |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1017 | return -1; |
| 1018 | } |
| 1019 | #endif |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1020 | #ifdef FREEBSD |
| 1021 | sprintf(proc, "/proc/%d/regs", tcp->pid); |
| 1022 | if ((tcp->pfd_reg = open(proc, O_RDONLY)) < 0) { |
| 1023 | perror("strace: open(\"/proc/.../regs\", ...)"); |
| 1024 | return -1; |
| 1025 | } |
| 1026 | if (cflag) { |
| 1027 | sprintf(proc, "/proc/%d/status", tcp->pid); |
| 1028 | if ((tcp->pfd_status = open(proc, O_RDONLY)) < 0) { |
| 1029 | perror("strace: open(\"/proc/.../status\", ...)"); |
| 1030 | return -1; |
| 1031 | } |
| 1032 | } else |
| 1033 | tcp->pfd_status = -1; |
| 1034 | #endif /* FREEBSD */ |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1035 | rebuild_pollv(); |
| 1036 | if (!attaching) { |
| 1037 | /* |
| 1038 | * Wait for the child to pause. Because of a race |
| 1039 | * condition we have to poll for the event. |
| 1040 | */ |
| 1041 | for (;;) { |
| 1042 | if (IOCTL_STATUS (tcp) < 0) { |
| 1043 | perror("strace: PIOCSTATUS"); |
| 1044 | return -1; |
| 1045 | } |
| 1046 | if (tcp->status.PR_FLAGS & PR_ASLEEP) |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1047 | break; |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1048 | } |
| 1049 | } |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1050 | #ifndef FREEBSD |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1051 | /* Stop the process so that we own the stop. */ |
Wichert Akkerman | 16a03d2 | 2000-08-10 02:14:04 +0000 | [diff] [blame] | 1052 | if (IOCTL(tcp->pfd, PIOCSTOP, (char *)NULL) < 0) { |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1053 | perror("strace: PIOCSTOP"); |
| 1054 | return -1; |
| 1055 | } |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 1056 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1057 | #ifdef PIOCSET |
| 1058 | /* Set Run-on-Last-Close. */ |
| 1059 | arg = PR_RLC; |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1060 | if (IOCTL(tcp->pfd, PIOCSET, &arg) < 0) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1061 | perror("PIOCSET PR_RLC"); |
| 1062 | return -1; |
| 1063 | } |
| 1064 | /* Set or Reset Inherit-on-Fork. */ |
| 1065 | arg = PR_FORK; |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1066 | if (IOCTL(tcp->pfd, followfork ? PIOCSET : PIOCRESET, &arg) < 0) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1067 | perror("PIOC{SET,RESET} PR_FORK"); |
| 1068 | return -1; |
| 1069 | } |
| 1070 | #else /* !PIOCSET */ |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 1071 | #ifndef FREEBSD |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1072 | if (ioctl(tcp->pfd, PIOCSRLC) < 0) { |
| 1073 | perror("PIOCSRLC"); |
| 1074 | return -1; |
| 1075 | } |
| 1076 | if (ioctl(tcp->pfd, followfork ? PIOCSFORK : PIOCRFORK) < 0) { |
| 1077 | perror("PIOC{S,R}FORK"); |
| 1078 | return -1; |
| 1079 | } |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1080 | #else /* FREEBSD */ |
| 1081 | /* just unset the PF_LINGER flag for the Run-on-Last-Close. */ |
| 1082 | if (ioctl(tcp->pfd, PIOCGFL, &arg) < 0) { |
| 1083 | perror("PIOCGFL"); |
| 1084 | return -1; |
| 1085 | } |
| 1086 | arg &= ~PF_LINGER; |
| 1087 | if (ioctl(tcp->pfd, PIOCSFL, arg) < 0) { |
| 1088 | perror("PIOCSFL"); |
| 1089 | return -1; |
| 1090 | } |
| 1091 | #endif /* FREEBSD */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1092 | #endif /* !PIOCSET */ |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1093 | #ifndef FREEBSD |
John Hughes | 19e4998 | 2001-10-19 08:59:12 +0000 | [diff] [blame] | 1094 | /* Enable all syscall entries we care about. */ |
| 1095 | premptyset(&syscalls); |
| 1096 | for (i = 1; i < MAX_QUALS; ++i) { |
| 1097 | if (i > (sizeof syscalls) * CHAR_BIT) break; |
| 1098 | if (qual_flags [i] & QUAL_TRACE) praddset (&syscalls, i); |
| 1099 | } |
| 1100 | praddset (&syscalls, SYS_execve); |
| 1101 | if (followfork) { |
| 1102 | praddset (&syscalls, SYS_fork); |
| 1103 | #ifdef SYS_forkall |
| 1104 | praddset (&syscalls, SYS_forkall); |
| 1105 | #endif |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 1106 | #ifdef SYS_fork1 |
John Hughes | 19e4998 | 2001-10-19 08:59:12 +0000 | [diff] [blame] | 1107 | praddset (&syscalls, SYS_fork1); |
| 1108 | #endif |
| 1109 | #ifdef SYS_rfork1 |
| 1110 | praddset (&syscalls, SYS_rfork1); |
| 1111 | #endif |
| 1112 | #ifdef SYS_rforkall |
| 1113 | praddset (&syscalls, SYS_rforkall); |
| 1114 | #endif |
| 1115 | } |
| 1116 | if (IOCTL(tcp->pfd, PIOCSENTRY, &syscalls) < 0) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1117 | perror("PIOCSENTRY"); |
| 1118 | return -1; |
| 1119 | } |
John Hughes | 19e4998 | 2001-10-19 08:59:12 +0000 | [diff] [blame] | 1120 | /* Enable the syscall exits. */ |
| 1121 | if (IOCTL(tcp->pfd, PIOCSEXIT, &syscalls) < 0) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1122 | perror("PIOSEXIT"); |
| 1123 | return -1; |
| 1124 | } |
John Hughes | 19e4998 | 2001-10-19 08:59:12 +0000 | [diff] [blame] | 1125 | /* Enable signals we care about. */ |
| 1126 | premptyset(&signals); |
| 1127 | for (i = 1; i < MAX_QUALS; ++i) { |
| 1128 | if (i > (sizeof signals) * CHAR_BIT) break; |
| 1129 | if (qual_flags [i] & QUAL_SIGNAL) praddset (&signals, i); |
| 1130 | } |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1131 | if (IOCTL(tcp->pfd, PIOCSTRACE, &signals) < 0) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1132 | perror("PIOCSTRACE"); |
| 1133 | return -1; |
| 1134 | } |
John Hughes | 19e4998 | 2001-10-19 08:59:12 +0000 | [diff] [blame] | 1135 | /* Enable faults we care about */ |
| 1136 | premptyset(&faults); |
| 1137 | for (i = 1; i < MAX_QUALS; ++i) { |
| 1138 | if (i > (sizeof faults) * CHAR_BIT) break; |
| 1139 | if (qual_flags [i] & QUAL_FAULT) praddset (&faults, i); |
| 1140 | } |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1141 | if (IOCTL(tcp->pfd, PIOCSFAULT, &faults) < 0) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1142 | perror("PIOCSFAULT"); |
| 1143 | return -1; |
| 1144 | } |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1145 | #else /* FREEBSD */ |
| 1146 | /* set events flags. */ |
| 1147 | arg = S_SIG | S_SCE | S_SCX ; |
| 1148 | if(ioctl(tcp->pfd, PIOCBIS, arg) < 0) { |
| 1149 | perror("PIOCBIS"); |
| 1150 | return -1; |
| 1151 | } |
| 1152 | #endif /* FREEBSD */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1153 | if (!attaching) { |
| 1154 | #ifdef MIPS |
| 1155 | /* |
| 1156 | * The SGI PRSABORT doesn't work for pause() so |
| 1157 | * we send it a caught signal to wake it up. |
| 1158 | */ |
| 1159 | kill(tcp->pid, SIGINT); |
| 1160 | #else /* !MIPS */ |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 1161 | #ifdef PRSABORT |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1162 | /* The child is in a pause(), abort it. */ |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1163 | arg = PRSABORT; |
| 1164 | if (IOCTL (tcp->pfd, PIOCRUN, &arg) < 0) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1165 | perror("PIOCRUN"); |
| 1166 | return -1; |
| 1167 | } |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 1168 | #endif |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1169 | #endif /* !MIPS*/ |
| 1170 | #ifdef FREEBSD |
| 1171 | /* wake up the child if it received the SIGSTOP */ |
| 1172 | kill(tcp->pid, SIGCONT); |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 1173 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1174 | for (;;) { |
| 1175 | /* Wait for the child to do something. */ |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1176 | if (IOCTL_WSTOP (tcp) < 0) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1177 | perror("PIOCWSTOP"); |
| 1178 | return -1; |
| 1179 | } |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1180 | if (tcp->status.PR_WHY == PR_SYSENTRY) { |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1181 | tcp->flags &= ~TCB_INSYSCALL; |
| 1182 | get_scno(tcp); |
Roland McGrath | 76989d7 | 2005-06-07 23:21:31 +0000 | [diff] [blame] | 1183 | if (known_scno(tcp) == SYS_execve) |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1184 | break; |
| 1185 | } |
| 1186 | /* Set it running: maybe execve will be next. */ |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1187 | #ifndef FREEBSD |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1188 | arg = 0; |
| 1189 | if (IOCTL(tcp->pfd, PIOCRUN, &arg) < 0) { |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1190 | #else /* FREEBSD */ |
| 1191 | if (IOCTL(tcp->pfd, PIOCRUN, 0) < 0) { |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 1192 | #endif /* FREEBSD */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1193 | perror("PIOCRUN"); |
| 1194 | return -1; |
| 1195 | } |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1196 | #ifdef FREEBSD |
| 1197 | /* handle the case where we "opened" the child before |
| 1198 | it did the kill -STOP */ |
| 1199 | if (tcp->status.PR_WHY == PR_SIGNALLED && |
| 1200 | tcp->status.PR_WHAT == SIGSTOP) |
| 1201 | kill(tcp->pid, SIGCONT); |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 1202 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1203 | } |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1204 | #ifndef FREEBSD |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1205 | } |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1206 | #else /* FREEBSD */ |
| 1207 | } else { |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 1208 | if (attaching < 2) { |
Wichert Akkerman | 2e4ffe5 | 2000-09-03 23:57:48 +0000 | [diff] [blame] | 1209 | /* We are attaching to an already running process. |
| 1210 | * Try to figure out the state of the process in syscalls, |
| 1211 | * to handle the first event well. |
| 1212 | * This is done by having a look at the "wchan" property of the |
| 1213 | * process, which tells where it is stopped (if it is). */ |
| 1214 | FILE * status; |
| 1215 | char wchan[20]; /* should be enough */ |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 1216 | |
Wichert Akkerman | 2e4ffe5 | 2000-09-03 23:57:48 +0000 | [diff] [blame] | 1217 | sprintf(proc, "/proc/%d/status", tcp->pid); |
| 1218 | status = fopen(proc, "r"); |
| 1219 | if (status && |
| 1220 | (fscanf(status, "%*s %*d %*d %*d %*d %*d,%*d %*s %*d,%*d" |
| 1221 | "%*d,%*d %*d,%*d %19s", wchan) == 1) && |
| 1222 | strcmp(wchan, "nochan") && strcmp(wchan, "spread") && |
| 1223 | strcmp(wchan, "stopevent")) { |
| 1224 | /* The process is asleep in the middle of a syscall. |
| 1225 | Fake the syscall entry event */ |
| 1226 | tcp->flags &= ~(TCB_INSYSCALL|TCB_STARTUP); |
| 1227 | tcp->status.PR_WHY = PR_SYSENTRY; |
| 1228 | trace_syscall(tcp); |
| 1229 | } |
| 1230 | if (status) |
| 1231 | fclose(status); |
| 1232 | } /* otherwise it's a fork being followed */ |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1233 | } |
| 1234 | #endif /* FREEBSD */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1235 | #ifndef HAVE_POLLABLE_PROCFS |
| 1236 | if (proc_poll_pipe[0] != -1) |
| 1237 | proc_poller(tcp->pfd); |
| 1238 | else if (nprocs > 1) { |
| 1239 | proc_poll_open(); |
| 1240 | proc_poller(last_pfd); |
| 1241 | proc_poller(tcp->pfd); |
| 1242 | } |
| 1243 | last_pfd = tcp->pfd; |
| 1244 | #endif /* !HAVE_POLLABLE_PROCFS */ |
| 1245 | return 0; |
| 1246 | } |
| 1247 | |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1248 | #endif /* USE_PROCFS */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1249 | |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 1250 | struct tcb * |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1251 | pid2tcb(pid) |
| 1252 | int pid; |
| 1253 | { |
| 1254 | int i; |
| 1255 | struct tcb *tcp; |
| 1256 | |
Roland McGrath | ee9d435 | 2002-12-18 04:16:10 +0000 | [diff] [blame] | 1257 | for (i = 0; i < tcbtabsize; i++) { |
| 1258 | tcp = tcbtab[i]; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1259 | if (pid && tcp->pid != pid) |
| 1260 | continue; |
| 1261 | if (tcp->flags & TCB_INUSE) |
| 1262 | return tcp; |
| 1263 | } |
| 1264 | return NULL; |
| 1265 | } |
| 1266 | |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1267 | #ifdef USE_PROCFS |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1268 | |
| 1269 | static struct tcb * |
| 1270 | pfd2tcb(pfd) |
| 1271 | int pfd; |
| 1272 | { |
| 1273 | int i; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1274 | |
Roland McGrath | ca16be8 | 2003-01-10 19:55:28 +0000 | [diff] [blame] | 1275 | for (i = 0; i < tcbtabsize; i++) { |
| 1276 | struct tcb *tcp = tcbtab[i]; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1277 | if (tcp->pfd != pfd) |
| 1278 | continue; |
| 1279 | if (tcp->flags & TCB_INUSE) |
| 1280 | return tcp; |
| 1281 | } |
| 1282 | return NULL; |
| 1283 | } |
| 1284 | |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1285 | #endif /* USE_PROCFS */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1286 | |
| 1287 | void |
| 1288 | droptcb(tcp) |
| 1289 | struct tcb *tcp; |
| 1290 | { |
| 1291 | if (tcp->pid == 0) |
| 1292 | return; |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 1293 | #ifdef TCB_CLONE_THREAD |
| 1294 | if (tcp->nclone_threads > 0) { |
| 1295 | /* There are other threads left in this process, but this |
| 1296 | is the one whose PID represents the whole process. |
| 1297 | We need to keep this record around as a zombie until |
| 1298 | all the threads die. */ |
| 1299 | tcp->flags |= TCB_EXITING; |
| 1300 | return; |
| 1301 | } |
| 1302 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1303 | nprocs--; |
| 1304 | tcp->pid = 0; |
Wichert Akkerman | eb8ebda | 2002-04-01 17:48:02 +0000 | [diff] [blame] | 1305 | |
Roland McGrath | e29341c | 2003-01-10 20:14:20 +0000 | [diff] [blame] | 1306 | if (tcp->parent != NULL) { |
| 1307 | tcp->parent->nchildren--; |
| 1308 | #ifdef TCB_CLONE_THREAD |
| 1309 | if (tcp->flags & TCB_CLONE_DETACHED) |
| 1310 | tcp->parent->nclone_detached--; |
| 1311 | if (tcp->flags & TCB_CLONE_THREAD) |
| 1312 | tcp->parent->nclone_threads--; |
| 1313 | #endif |
Roland McGrath | 0962345 | 2003-05-23 02:27:13 +0000 | [diff] [blame] | 1314 | #ifdef TCB_CLONE_DETACHED |
| 1315 | if (!(tcp->flags & TCB_CLONE_DETACHED)) |
| 1316 | #endif |
| 1317 | tcp->parent->nzombies++; |
Roland McGrath | 276ceb3 | 2007-11-13 08:12:12 +0000 | [diff] [blame] | 1318 | #ifdef LINUX |
| 1319 | /* Update `tcp->parent->parent->nchildren' and the other fields |
| 1320 | like NCLONE_DETACHED, only for zombie group leader that has |
| 1321 | already reported and been short-circuited at the top of this |
| 1322 | function. The same condition as at the top of DETACH. */ |
| 1323 | if ((tcp->flags & TCB_CLONE_THREAD) && |
| 1324 | tcp->parent->nclone_threads == 0 && |
| 1325 | (tcp->parent->flags & TCB_EXITING)) |
| 1326 | droptcb(tcp->parent); |
| 1327 | #endif |
Roland McGrath | e29341c | 2003-01-10 20:14:20 +0000 | [diff] [blame] | 1328 | tcp->parent = NULL; |
| 1329 | } |
| 1330 | |
| 1331 | tcp->flags = 0; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1332 | if (tcp->pfd != -1) { |
| 1333 | close(tcp->pfd); |
| 1334 | tcp->pfd = -1; |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1335 | #ifdef FREEBSD |
| 1336 | if (tcp->pfd_reg != -1) { |
| 1337 | close(tcp->pfd_reg); |
| 1338 | tcp->pfd_reg = -1; |
| 1339 | } |
| 1340 | if (tcp->pfd_status != -1) { |
| 1341 | close(tcp->pfd_status); |
| 1342 | tcp->pfd_status = -1; |
| 1343 | } |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 1344 | #endif /* !FREEBSD */ |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1345 | #ifdef USE_PROCFS |
Roland McGrath | e29341c | 2003-01-10 20:14:20 +0000 | [diff] [blame] | 1346 | rebuild_pollv(); /* Note, flags needs to be cleared by now. */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1347 | #endif |
| 1348 | } |
Wichert Akkerman | eb8ebda | 2002-04-01 17:48:02 +0000 | [diff] [blame] | 1349 | |
Wichert Akkerman | 822f0c9 | 2002-04-03 10:55:14 +0000 | [diff] [blame] | 1350 | if (outfname && followfork > 1 && tcp->outf) |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1351 | fclose(tcp->outf); |
Wichert Akkerman | eb8ebda | 2002-04-01 17:48:02 +0000 | [diff] [blame] | 1352 | |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1353 | tcp->outf = 0; |
| 1354 | } |
| 1355 | |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1356 | #ifndef USE_PROCFS |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1357 | |
| 1358 | static int |
| 1359 | resume(tcp) |
| 1360 | struct tcb *tcp; |
| 1361 | { |
| 1362 | if (tcp == NULL) |
| 1363 | return -1; |
| 1364 | |
| 1365 | if (!(tcp->flags & TCB_SUSPENDED)) { |
| 1366 | fprintf(stderr, "PANIC: pid %u not suspended\n", tcp->pid); |
| 1367 | return -1; |
| 1368 | } |
| 1369 | tcp->flags &= ~TCB_SUSPENDED; |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 1370 | #ifdef TCB_CLONE_THREAD |
| 1371 | if (tcp->flags & TCB_CLONE_THREAD) |
| 1372 | tcp->parent->nclone_waiting--; |
| 1373 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1374 | |
Denys Vlasenko | 732d1bf | 2008-12-17 19:21:59 +0000 | [diff] [blame^] | 1375 | if (ptrace_restart(PTRACE_SYSCALL, tcp, 0) < 0) |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1376 | return -1; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1377 | |
| 1378 | if (!qflag) |
| 1379 | fprintf(stderr, "Process %u resumed\n", tcp->pid); |
| 1380 | return 0; |
| 1381 | } |
| 1382 | |
Roland McGrath | 1bfd310 | 2007-08-03 10:02:00 +0000 | [diff] [blame] | 1383 | static int |
| 1384 | resume_from_tcp (struct tcb *tcp) |
| 1385 | { |
| 1386 | int error = 0; |
| 1387 | int resumed = 0; |
| 1388 | |
| 1389 | /* XXX This won't always be quite right (but it never was). |
| 1390 | A waiter with argument 0 or < -1 is waiting for any pid in |
| 1391 | a particular pgrp, which this child might or might not be |
| 1392 | in. The waiter will only wake up if it's argument is -1 |
| 1393 | or if it's waiting for tcp->pid's pgrp. It makes a |
| 1394 | difference to wake up a waiter when there might be more |
| 1395 | traced children, because it could get a false ECHILD |
| 1396 | error. OTOH, if this was the last child in the pgrp, then |
| 1397 | it ought to wake up and get ECHILD. We would have to |
| 1398 | search the system for all pid's in the pgrp to be sure. |
| 1399 | |
| 1400 | && (t->waitpid == -1 || |
| 1401 | (t->waitpid == 0 && getpgid (tcp->pid) == getpgid (t->pid)) |
| 1402 | || (t->waitpid < 0 && t->waitpid == -getpid (t->pid))) |
| 1403 | */ |
| 1404 | |
| 1405 | if (tcp->parent && |
| 1406 | (tcp->parent->flags & TCB_SUSPENDED) && |
| 1407 | (tcp->parent->waitpid <= 0 || tcp->parent->waitpid == tcp->pid)) { |
| 1408 | error = resume(tcp->parent); |
| 1409 | ++resumed; |
| 1410 | } |
| 1411 | #ifdef TCB_CLONE_THREAD |
| 1412 | if (tcp->parent && tcp->parent->nclone_waiting > 0) { |
| 1413 | /* Some other threads of our parent are waiting too. */ |
| 1414 | unsigned int i; |
| 1415 | |
| 1416 | /* Resume all the threads that were waiting for this PID. */ |
| 1417 | for (i = 0; i < tcbtabsize; i++) { |
| 1418 | struct tcb *t = tcbtab[i]; |
| 1419 | if (t->parent == tcp->parent && t != tcp |
| 1420 | && ((t->flags & (TCB_CLONE_THREAD|TCB_SUSPENDED)) |
| 1421 | == (TCB_CLONE_THREAD|TCB_SUSPENDED)) |
| 1422 | && t->waitpid == tcp->pid) { |
| 1423 | error |= resume (t); |
| 1424 | ++resumed; |
| 1425 | } |
| 1426 | } |
| 1427 | if (resumed == 0) |
| 1428 | /* Noone was waiting for this PID in particular, |
| 1429 | so now we might need to resume some wildcarders. */ |
| 1430 | for (i = 0; i < tcbtabsize; i++) { |
| 1431 | struct tcb *t = tcbtab[i]; |
| 1432 | if (t->parent == tcp->parent && t != tcp |
| 1433 | && ((t->flags |
| 1434 | & (TCB_CLONE_THREAD|TCB_SUSPENDED)) |
| 1435 | == (TCB_CLONE_THREAD|TCB_SUSPENDED)) |
| 1436 | && t->waitpid <= 0 |
| 1437 | ) { |
| 1438 | error |= resume (t); |
| 1439 | break; |
| 1440 | } |
| 1441 | } |
| 1442 | } |
| 1443 | |
| 1444 | return error; |
| 1445 | } |
| 1446 | #endif |
| 1447 | |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1448 | #endif /* !USE_PROCFS */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1449 | |
Roland McGrath | 0a46388 | 2007-07-05 18:43:16 +0000 | [diff] [blame] | 1450 | /* detach traced process; continue with sig |
| 1451 | Never call DETACH twice on the same process as both unattached and |
| 1452 | attached-unstopped processes give the same ESRCH. For unattached process we |
| 1453 | would SIGSTOP it and wait for its SIGSTOP notification forever. */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1454 | |
| 1455 | static int |
| 1456 | detach(tcp, sig) |
| 1457 | struct tcb *tcp; |
| 1458 | int sig; |
| 1459 | { |
| 1460 | int error = 0; |
Roland McGrath | ca16be8 | 2003-01-10 19:55:28 +0000 | [diff] [blame] | 1461 | #ifdef LINUX |
Roland McGrath | 1bfd310 | 2007-08-03 10:02:00 +0000 | [diff] [blame] | 1462 | int status, catch_sigstop; |
Roland McGrath | a08a97e | 2005-08-03 11:23:46 +0000 | [diff] [blame] | 1463 | struct tcb *zombie = NULL; |
| 1464 | |
| 1465 | /* If the group leader is lingering only because of this other |
| 1466 | thread now dying, then detach the leader as well. */ |
| 1467 | if ((tcp->flags & TCB_CLONE_THREAD) && |
| 1468 | tcp->parent->nclone_threads == 1 && |
| 1469 | (tcp->parent->flags & TCB_EXITING)) |
| 1470 | zombie = tcp->parent; |
Roland McGrath | ca16be8 | 2003-01-10 19:55:28 +0000 | [diff] [blame] | 1471 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1472 | |
| 1473 | if (tcp->flags & TCB_BPTSET) |
| 1474 | sig = SIGKILL; |
| 1475 | |
| 1476 | #ifdef LINUX |
| 1477 | /* |
| 1478 | * Linux wrongly insists the child be stopped |
Roland McGrath | 7bf1047 | 2002-12-16 20:42:50 +0000 | [diff] [blame] | 1479 | * before detaching. Arghh. We go through hoops |
| 1480 | * to make a clean break of things. |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1481 | */ |
Roland McGrath | 7bf1047 | 2002-12-16 20:42:50 +0000 | [diff] [blame] | 1482 | #if defined(SPARC) |
| 1483 | #undef PTRACE_DETACH |
| 1484 | #define PTRACE_DETACH PTRACE_SUNDETACH |
| 1485 | #endif |
Roland McGrath | 0220331 | 2007-06-11 22:06:31 +0000 | [diff] [blame] | 1486 | /* |
| 1487 | * On TCB_STARTUP we did PTRACE_ATTACH but still did not get the |
| 1488 | * expected SIGSTOP. We must catch exactly one as otherwise the |
| 1489 | * detached process would be left stopped (process state T). |
| 1490 | */ |
| 1491 | catch_sigstop = (tcp->flags & TCB_STARTUP); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1492 | if ((error = ptrace(PTRACE_DETACH, tcp->pid, (char *) 1, sig)) == 0) { |
| 1493 | /* On a clear day, you can see forever. */ |
Roland McGrath | 7bf1047 | 2002-12-16 20:42:50 +0000 | [diff] [blame] | 1494 | } |
| 1495 | else if (errno != ESRCH) { |
| 1496 | /* Shouldn't happen. */ |
| 1497 | perror("detach: ptrace(PTRACE_DETACH, ...)"); |
| 1498 | } |
Roland McGrath | 134813a | 2007-06-02 00:07:33 +0000 | [diff] [blame] | 1499 | else if (my_tgkill((tcp->flags & TCB_CLONE_THREAD ? tcp->parent->pid |
| 1500 | : tcp->pid), |
| 1501 | tcp->pid, 0) < 0) { |
Roland McGrath | 7bf1047 | 2002-12-16 20:42:50 +0000 | [diff] [blame] | 1502 | if (errno != ESRCH) |
| 1503 | perror("detach: checking sanity"); |
| 1504 | } |
Roland McGrath | 0220331 | 2007-06-11 22:06:31 +0000 | [diff] [blame] | 1505 | else if (!catch_sigstop && my_tgkill((tcp->flags & TCB_CLONE_THREAD |
| 1506 | ? tcp->parent->pid : tcp->pid), |
| 1507 | tcp->pid, SIGSTOP) < 0) { |
Roland McGrath | 7bf1047 | 2002-12-16 20:42:50 +0000 | [diff] [blame] | 1508 | if (errno != ESRCH) |
| 1509 | perror("detach: stopping child"); |
| 1510 | } |
Roland McGrath | 0220331 | 2007-06-11 22:06:31 +0000 | [diff] [blame] | 1511 | else |
| 1512 | catch_sigstop = 1; |
| 1513 | if (catch_sigstop) |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1514 | for (;;) { |
Roland McGrath | 7508cb4 | 2002-12-17 10:48:05 +0000 | [diff] [blame] | 1515 | #ifdef __WALL |
| 1516 | if (wait4(tcp->pid, &status, __WALL, NULL) < 0) { |
| 1517 | if (errno == ECHILD) /* Already gone. */ |
| 1518 | break; |
| 1519 | if (errno != EINVAL) { |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 1520 | perror("detach: waiting"); |
Roland McGrath | 7508cb4 | 2002-12-17 10:48:05 +0000 | [diff] [blame] | 1521 | break; |
| 1522 | } |
| 1523 | #endif /* __WALL */ |
| 1524 | /* No __WALL here. */ |
| 1525 | if (waitpid(tcp->pid, &status, 0) < 0) { |
| 1526 | if (errno != ECHILD) { |
| 1527 | perror("detach: waiting"); |
| 1528 | break; |
| 1529 | } |
| 1530 | #ifdef __WCLONE |
| 1531 | /* If no processes, try clones. */ |
| 1532 | if (wait4(tcp->pid, &status, __WCLONE, |
| 1533 | NULL) < 0) { |
| 1534 | if (errno != ECHILD) |
| 1535 | perror("detach: waiting"); |
| 1536 | break; |
| 1537 | } |
| 1538 | #endif /* __WCLONE */ |
| 1539 | } |
| 1540 | #ifdef __WALL |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 1541 | } |
Roland McGrath | 7508cb4 | 2002-12-17 10:48:05 +0000 | [diff] [blame] | 1542 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1543 | if (!WIFSTOPPED(status)) { |
| 1544 | /* Au revoir, mon ami. */ |
| 1545 | break; |
| 1546 | } |
| 1547 | if (WSTOPSIG(status) == SIGSTOP) { |
Denys Vlasenko | 732d1bf | 2008-12-17 19:21:59 +0000 | [diff] [blame^] | 1548 | ptrace_restart(PTRACE_DETACH, tcp, sig); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1549 | break; |
| 1550 | } |
Denys Vlasenko | 732d1bf | 2008-12-17 19:21:59 +0000 | [diff] [blame^] | 1551 | error = ptrace_restart(PTRACE_CONT, tcp, |
| 1552 | WSTOPSIG(status) == SIGTRAP ? 0 |
| 1553 | : WSTOPSIG(status)); |
| 1554 | if (error < 0) |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1555 | break; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1556 | } |
Roland McGrath | 7bf1047 | 2002-12-16 20:42:50 +0000 | [diff] [blame] | 1557 | #endif /* LINUX */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1558 | |
| 1559 | #if defined(SUNOS4) |
| 1560 | /* PTRACE_DETACH won't respect `sig' argument, so we post it here. */ |
| 1561 | if (sig && kill(tcp->pid, sig) < 0) |
| 1562 | perror("detach: kill"); |
| 1563 | sig = 0; |
Denys Vlasenko | 732d1bf | 2008-12-17 19:21:59 +0000 | [diff] [blame^] | 1564 | error = ptrace_restart(PTRACE_DETACH, tcp, sig); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1565 | #endif /* SUNOS4 */ |
| 1566 | |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1567 | #ifndef USE_PROCFS |
Roland McGrath | 1bfd310 | 2007-08-03 10:02:00 +0000 | [diff] [blame] | 1568 | error |= resume_from_tcp (tcp); |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 1569 | #endif |
| 1570 | |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1571 | if (!qflag) |
| 1572 | fprintf(stderr, "Process %u detached\n", tcp->pid); |
| 1573 | |
| 1574 | droptcb(tcp); |
Roland McGrath | a08a97e | 2005-08-03 11:23:46 +0000 | [diff] [blame] | 1575 | |
| 1576 | #ifdef LINUX |
Roland McGrath | 0a46388 | 2007-07-05 18:43:16 +0000 | [diff] [blame] | 1577 | if (zombie != NULL) { |
| 1578 | /* TCP no longer exists therefore you must not detach () it. */ |
| 1579 | droptcb(zombie); |
| 1580 | } |
Roland McGrath | a08a97e | 2005-08-03 11:23:46 +0000 | [diff] [blame] | 1581 | #endif |
| 1582 | |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1583 | return error; |
| 1584 | } |
| 1585 | |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1586 | #ifdef USE_PROCFS |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1587 | |
| 1588 | static void |
| 1589 | reaper(sig) |
| 1590 | int sig; |
| 1591 | { |
| 1592 | int pid; |
| 1593 | int status; |
| 1594 | |
| 1595 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0) { |
| 1596 | #if 0 |
| 1597 | struct tcb *tcp; |
| 1598 | |
| 1599 | tcp = pid2tcb(pid); |
| 1600 | if (tcp) |
| 1601 | droptcb(tcp); |
| 1602 | #endif |
| 1603 | } |
| 1604 | } |
| 1605 | |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1606 | #endif /* USE_PROCFS */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1607 | |
| 1608 | static void |
| 1609 | cleanup() |
| 1610 | { |
| 1611 | int i; |
| 1612 | struct tcb *tcp; |
| 1613 | |
Roland McGrath | ee9d435 | 2002-12-18 04:16:10 +0000 | [diff] [blame] | 1614 | for (i = 0; i < tcbtabsize; i++) { |
| 1615 | tcp = tcbtab[i]; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1616 | if (!(tcp->flags & TCB_INUSE)) |
| 1617 | continue; |
| 1618 | if (debug) |
| 1619 | fprintf(stderr, |
| 1620 | "cleanup: looking at pid %u\n", tcp->pid); |
| 1621 | if (tcp_last && |
| 1622 | (!outfname || followfork < 2 || tcp_last == tcp)) { |
| 1623 | tprintf(" <unfinished ...>\n"); |
| 1624 | tcp_last = NULL; |
| 1625 | } |
| 1626 | if (tcp->flags & TCB_ATTACHED) |
| 1627 | detach(tcp, 0); |
| 1628 | else { |
| 1629 | kill(tcp->pid, SIGCONT); |
| 1630 | kill(tcp->pid, SIGTERM); |
| 1631 | } |
| 1632 | } |
| 1633 | if (cflag) |
| 1634 | call_summary(outf); |
| 1635 | } |
| 1636 | |
| 1637 | static void |
| 1638 | interrupt(sig) |
| 1639 | int sig; |
| 1640 | { |
| 1641 | interrupted = 1; |
| 1642 | } |
| 1643 | |
| 1644 | #ifndef HAVE_STRERROR |
| 1645 | |
Roland McGrath | 6d2b349 | 2002-12-30 00:51:30 +0000 | [diff] [blame] | 1646 | #if !HAVE_DECL_SYS_ERRLIST |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1647 | extern int sys_nerr; |
| 1648 | extern char *sys_errlist[]; |
Roland McGrath | 6d2b349 | 2002-12-30 00:51:30 +0000 | [diff] [blame] | 1649 | #endif /* HAVE_DECL_SYS_ERRLIST */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1650 | |
| 1651 | const char * |
| 1652 | strerror(errno) |
| 1653 | int errno; |
| 1654 | { |
| 1655 | static char buf[64]; |
| 1656 | |
| 1657 | if (errno < 1 || errno >= sys_nerr) { |
| 1658 | sprintf(buf, "Unknown error %d", errno); |
| 1659 | return buf; |
| 1660 | } |
| 1661 | return sys_errlist[errno]; |
| 1662 | } |
| 1663 | |
| 1664 | #endif /* HAVE_STERRROR */ |
| 1665 | |
| 1666 | #ifndef HAVE_STRSIGNAL |
| 1667 | |
Roland McGrath | 8f474e0 | 2003-01-14 07:53:33 +0000 | [diff] [blame] | 1668 | #if defined HAVE_SYS_SIGLIST && !defined HAVE_DECL_SYS_SIGLIST |
Roland McGrath | 6d2b349 | 2002-12-30 00:51:30 +0000 | [diff] [blame] | 1669 | extern char *sys_siglist[]; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1670 | #endif |
Roland McGrath | 8f474e0 | 2003-01-14 07:53:33 +0000 | [diff] [blame] | 1671 | #if defined HAVE_SYS__SIGLIST && !defined HAVE_DECL__SYS_SIGLIST |
| 1672 | extern char *_sys_siglist[]; |
| 1673 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1674 | |
| 1675 | const char * |
| 1676 | strsignal(sig) |
| 1677 | int sig; |
| 1678 | { |
| 1679 | static char buf[64]; |
| 1680 | |
| 1681 | if (sig < 1 || sig >= NSIG) { |
| 1682 | sprintf(buf, "Unknown signal %d", sig); |
| 1683 | return buf; |
| 1684 | } |
| 1685 | #ifdef HAVE__SYS_SIGLIST |
| 1686 | return _sys_siglist[sig]; |
| 1687 | #else |
| 1688 | return sys_siglist[sig]; |
| 1689 | #endif |
| 1690 | } |
| 1691 | |
| 1692 | #endif /* HAVE_STRSIGNAL */ |
| 1693 | |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1694 | #ifdef USE_PROCFS |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1695 | |
| 1696 | static void |
| 1697 | rebuild_pollv() |
| 1698 | { |
| 1699 | int i, j; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1700 | |
Roland McGrath | ee9d435 | 2002-12-18 04:16:10 +0000 | [diff] [blame] | 1701 | if (pollv != NULL) |
| 1702 | free (pollv); |
Roland McGrath | c012d22 | 2003-01-10 20:05:56 +0000 | [diff] [blame] | 1703 | pollv = (struct pollfd *) malloc(nprocs * sizeof pollv[0]); |
Roland McGrath | ee9d435 | 2002-12-18 04:16:10 +0000 | [diff] [blame] | 1704 | if (pollv == NULL) { |
Roland McGrath | 46100d0 | 2005-06-01 18:55:42 +0000 | [diff] [blame] | 1705 | fprintf(stderr, "%s: out of memory\n", progname); |
Roland McGrath | ee9d435 | 2002-12-18 04:16:10 +0000 | [diff] [blame] | 1706 | exit(1); |
| 1707 | } |
| 1708 | |
Roland McGrath | ca16be8 | 2003-01-10 19:55:28 +0000 | [diff] [blame] | 1709 | for (i = j = 0; i < tcbtabsize; i++) { |
| 1710 | struct tcb *tcp = tcbtab[i]; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1711 | if (!(tcp->flags & TCB_INUSE)) |
| 1712 | continue; |
| 1713 | pollv[j].fd = tcp->pfd; |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1714 | pollv[j].events = POLLWANT; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1715 | j++; |
| 1716 | } |
| 1717 | if (j != nprocs) { |
| 1718 | fprintf(stderr, "strace: proc miscount\n"); |
| 1719 | exit(1); |
| 1720 | } |
| 1721 | } |
| 1722 | |
| 1723 | #ifndef HAVE_POLLABLE_PROCFS |
| 1724 | |
| 1725 | static void |
| 1726 | proc_poll_open() |
| 1727 | { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1728 | int i; |
| 1729 | |
| 1730 | if (pipe(proc_poll_pipe) < 0) { |
| 1731 | perror("pipe"); |
| 1732 | exit(1); |
| 1733 | } |
| 1734 | for (i = 0; i < 2; i++) { |
Dmitry V. Levin | 10de62b | 2006-12-13 21:45:31 +0000 | [diff] [blame] | 1735 | if (set_cloexec_flag(proc_poll_pipe[i]) < 0) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1736 | exit(1); |
| 1737 | } |
| 1738 | } |
| 1739 | } |
| 1740 | |
| 1741 | static int |
| 1742 | proc_poll(pollv, nfds, timeout) |
| 1743 | struct pollfd *pollv; |
| 1744 | int nfds; |
| 1745 | int timeout; |
| 1746 | { |
| 1747 | int i; |
| 1748 | int n; |
| 1749 | struct proc_pollfd pollinfo; |
| 1750 | |
| 1751 | if ((n = read(proc_poll_pipe[0], &pollinfo, sizeof(pollinfo))) < 0) |
| 1752 | return n; |
| 1753 | if (n != sizeof(struct proc_pollfd)) { |
| 1754 | fprintf(stderr, "panic: short read: %d\n", n); |
| 1755 | exit(1); |
| 1756 | } |
| 1757 | for (i = 0; i < nprocs; i++) { |
| 1758 | if (pollv[i].fd == pollinfo.fd) |
| 1759 | pollv[i].revents = pollinfo.revents; |
| 1760 | else |
| 1761 | pollv[i].revents = 0; |
| 1762 | } |
| 1763 | poller_pid = pollinfo.pid; |
| 1764 | return 1; |
| 1765 | } |
| 1766 | |
| 1767 | static void |
| 1768 | wakeup_handler(sig) |
| 1769 | int sig; |
| 1770 | { |
| 1771 | } |
| 1772 | |
| 1773 | static void |
| 1774 | proc_poller(pfd) |
| 1775 | int pfd; |
| 1776 | { |
| 1777 | struct proc_pollfd pollinfo; |
| 1778 | struct sigaction sa; |
| 1779 | sigset_t blocked_set, empty_set; |
| 1780 | int i; |
| 1781 | int n; |
| 1782 | struct rlimit rl; |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1783 | #ifdef FREEBSD |
| 1784 | struct procfs_status pfs; |
| 1785 | #endif /* FREEBSD */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1786 | |
| 1787 | switch (fork()) { |
| 1788 | case -1: |
| 1789 | perror("fork"); |
Dmitry V. Levin | a680965 | 2008-11-10 17:14:58 +0000 | [diff] [blame] | 1790 | _exit(1); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1791 | case 0: |
| 1792 | break; |
| 1793 | default: |
| 1794 | return; |
| 1795 | } |
| 1796 | |
| 1797 | sa.sa_handler = interactive ? SIG_DFL : SIG_IGN; |
| 1798 | sa.sa_flags = 0; |
| 1799 | sigemptyset(&sa.sa_mask); |
| 1800 | sigaction(SIGHUP, &sa, NULL); |
| 1801 | sigaction(SIGINT, &sa, NULL); |
| 1802 | sigaction(SIGQUIT, &sa, NULL); |
| 1803 | sigaction(SIGPIPE, &sa, NULL); |
| 1804 | sigaction(SIGTERM, &sa, NULL); |
| 1805 | sa.sa_handler = wakeup_handler; |
| 1806 | sigaction(SIGUSR1, &sa, NULL); |
| 1807 | sigemptyset(&blocked_set); |
| 1808 | sigaddset(&blocked_set, SIGUSR1); |
| 1809 | sigprocmask(SIG_BLOCK, &blocked_set, NULL); |
| 1810 | sigemptyset(&empty_set); |
| 1811 | |
| 1812 | if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { |
| 1813 | perror("getrlimit(RLIMIT_NOFILE, ...)"); |
Dmitry V. Levin | a680965 | 2008-11-10 17:14:58 +0000 | [diff] [blame] | 1814 | _exit(1); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1815 | } |
| 1816 | n = rl.rlim_cur; |
| 1817 | for (i = 0; i < n; i++) { |
| 1818 | if (i != pfd && i != proc_poll_pipe[1]) |
| 1819 | close(i); |
| 1820 | } |
| 1821 | |
| 1822 | pollinfo.fd = pfd; |
| 1823 | pollinfo.pid = getpid(); |
| 1824 | for (;;) { |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1825 | #ifndef FREEBSD |
| 1826 | if (ioctl(pfd, PIOCWSTOP, NULL) < 0) |
| 1827 | #else /* FREEBSD */ |
| 1828 | if (ioctl(pfd, PIOCWSTOP, &pfs) < 0) |
| 1829 | #endif /* FREEBSD */ |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1830 | { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1831 | switch (errno) { |
| 1832 | case EINTR: |
| 1833 | continue; |
| 1834 | case EBADF: |
| 1835 | pollinfo.revents = POLLERR; |
| 1836 | break; |
| 1837 | case ENOENT: |
| 1838 | pollinfo.revents = POLLHUP; |
| 1839 | break; |
| 1840 | default: |
| 1841 | perror("proc_poller: PIOCWSTOP"); |
| 1842 | } |
| 1843 | write(proc_poll_pipe[1], &pollinfo, sizeof(pollinfo)); |
| 1844 | _exit(0); |
| 1845 | } |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1846 | pollinfo.revents = POLLWANT; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1847 | write(proc_poll_pipe[1], &pollinfo, sizeof(pollinfo)); |
| 1848 | sigsuspend(&empty_set); |
| 1849 | } |
| 1850 | } |
| 1851 | |
| 1852 | #endif /* !HAVE_POLLABLE_PROCFS */ |
| 1853 | |
| 1854 | static int |
| 1855 | choose_pfd() |
| 1856 | { |
| 1857 | int i, j; |
| 1858 | struct tcb *tcp; |
| 1859 | |
| 1860 | static int last; |
| 1861 | |
| 1862 | if (followfork < 2 && |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1863 | last < nprocs && (pollv[last].revents & POLLWANT)) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1864 | /* |
| 1865 | * The previous process is ready to run again. We'll |
| 1866 | * let it do so if it is currently in a syscall. This |
| 1867 | * heuristic improves the readability of the trace. |
| 1868 | */ |
| 1869 | tcp = pfd2tcb(pollv[last].fd); |
| 1870 | if (tcp && (tcp->flags & TCB_INSYSCALL)) |
| 1871 | return pollv[last].fd; |
| 1872 | } |
| 1873 | |
| 1874 | for (i = 0; i < nprocs; i++) { |
| 1875 | /* Let competing children run round robin. */ |
| 1876 | j = (i + last + 1) % nprocs; |
| 1877 | if (pollv[j].revents & (POLLHUP | POLLERR)) { |
| 1878 | tcp = pfd2tcb(pollv[j].fd); |
| 1879 | if (!tcp) { |
| 1880 | fprintf(stderr, "strace: lost proc\n"); |
| 1881 | exit(1); |
| 1882 | } |
| 1883 | droptcb(tcp); |
| 1884 | return -1; |
| 1885 | } |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1886 | if (pollv[j].revents & POLLWANT) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1887 | last = j; |
| 1888 | return pollv[j].fd; |
| 1889 | } |
| 1890 | } |
| 1891 | fprintf(stderr, "strace: nothing ready\n"); |
| 1892 | exit(1); |
| 1893 | } |
| 1894 | |
| 1895 | static int |
| 1896 | trace() |
| 1897 | { |
Wichert Akkerman | 9dbf154 | 1999-11-26 13:11:29 +0000 | [diff] [blame] | 1898 | #ifdef POLL_HACK |
John Hughes | d870b3c | 2002-05-21 11:24:18 +0000 | [diff] [blame] | 1899 | struct tcb *in_syscall = NULL; |
Wichert Akkerman | 9dbf154 | 1999-11-26 13:11:29 +0000 | [diff] [blame] | 1900 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1901 | struct tcb *tcp; |
| 1902 | int pfd; |
| 1903 | int what; |
| 1904 | int ioctl_result = 0, ioctl_errno = 0; |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1905 | long arg; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1906 | |
| 1907 | for (;;) { |
| 1908 | if (interactive) |
| 1909 | sigprocmask(SIG_SETMASK, &empty_set, NULL); |
| 1910 | |
| 1911 | if (nprocs == 0) |
| 1912 | break; |
| 1913 | |
| 1914 | switch (nprocs) { |
| 1915 | case 1: |
| 1916 | #ifndef HAVE_POLLABLE_PROCFS |
| 1917 | if (proc_poll_pipe[0] == -1) { |
| 1918 | #endif |
| 1919 | tcp = pid2tcb(0); |
| 1920 | if (!tcp) |
| 1921 | continue; |
| 1922 | pfd = tcp->pfd; |
| 1923 | if (pfd == -1) |
| 1924 | continue; |
| 1925 | break; |
| 1926 | #ifndef HAVE_POLLABLE_PROCFS |
| 1927 | } |
| 1928 | /* fall through ... */ |
| 1929 | #endif /* !HAVE_POLLABLE_PROCFS */ |
| 1930 | default: |
| 1931 | #ifdef HAVE_POLLABLE_PROCFS |
Wichert Akkerman | 9dbf154 | 1999-11-26 13:11:29 +0000 | [diff] [blame] | 1932 | #ifdef POLL_HACK |
| 1933 | /* On some systems (e.g. UnixWare) we get too much ugly |
| 1934 | "unfinished..." stuff when multiple proceses are in |
| 1935 | syscalls. Here's a nasty hack */ |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 1936 | |
Wichert Akkerman | 9dbf154 | 1999-11-26 13:11:29 +0000 | [diff] [blame] | 1937 | if (in_syscall) { |
| 1938 | struct pollfd pv; |
| 1939 | tcp = in_syscall; |
| 1940 | in_syscall = NULL; |
| 1941 | pv.fd = tcp->pfd; |
| 1942 | pv.events = POLLWANT; |
| 1943 | if ((what = poll (&pv, 1, 1)) < 0) { |
| 1944 | if (interrupted) |
| 1945 | return 0; |
| 1946 | continue; |
| 1947 | } |
| 1948 | else if (what == 1 && pv.revents & POLLWANT) { |
| 1949 | goto FOUND; |
| 1950 | } |
| 1951 | } |
| 1952 | #endif |
| 1953 | |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1954 | if (poll(pollv, nprocs, INFTIM) < 0) { |
| 1955 | if (interrupted) |
| 1956 | return 0; |
| 1957 | continue; |
| 1958 | } |
| 1959 | #else /* !HAVE_POLLABLE_PROCFS */ |
| 1960 | if (proc_poll(pollv, nprocs, INFTIM) < 0) { |
| 1961 | if (interrupted) |
| 1962 | return 0; |
| 1963 | continue; |
| 1964 | } |
| 1965 | #endif /* !HAVE_POLLABLE_PROCFS */ |
| 1966 | pfd = choose_pfd(); |
| 1967 | if (pfd == -1) |
| 1968 | continue; |
| 1969 | break; |
| 1970 | } |
| 1971 | |
| 1972 | /* Look up `pfd' in our table. */ |
| 1973 | if ((tcp = pfd2tcb(pfd)) == NULL) { |
| 1974 | fprintf(stderr, "unknown pfd: %u\n", pfd); |
| 1975 | exit(1); |
| 1976 | } |
John Hughes | b664308 | 2002-05-23 11:02:22 +0000 | [diff] [blame] | 1977 | #ifdef POLL_HACK |
Wichert Akkerman | 9dbf154 | 1999-11-26 13:11:29 +0000 | [diff] [blame] | 1978 | FOUND: |
John Hughes | b664308 | 2002-05-23 11:02:22 +0000 | [diff] [blame] | 1979 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1980 | /* Get the status of the process. */ |
| 1981 | if (!interrupted) { |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1982 | #ifndef FREEBSD |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 1983 | ioctl_result = IOCTL_WSTOP (tcp); |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 1984 | #else /* FREEBSD */ |
| 1985 | /* Thanks to some scheduling mystery, the first poller |
| 1986 | sometimes waits for the already processed end of fork |
| 1987 | event. Doing a non blocking poll here solves the problem. */ |
| 1988 | if (proc_poll_pipe[0] != -1) |
| 1989 | ioctl_result = IOCTL_STATUS (tcp); |
| 1990 | else |
| 1991 | ioctl_result = IOCTL_WSTOP (tcp); |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 1992 | #endif /* FREEBSD */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 1993 | ioctl_errno = errno; |
| 1994 | #ifndef HAVE_POLLABLE_PROCFS |
| 1995 | if (proc_poll_pipe[0] != -1) { |
| 1996 | if (ioctl_result < 0) |
| 1997 | kill(poller_pid, SIGKILL); |
| 1998 | else |
| 1999 | kill(poller_pid, SIGUSR1); |
| 2000 | } |
| 2001 | #endif /* !HAVE_POLLABLE_PROCFS */ |
| 2002 | } |
| 2003 | if (interrupted) |
| 2004 | return 0; |
| 2005 | |
| 2006 | if (interactive) |
| 2007 | sigprocmask(SIG_BLOCK, &blocked_set, NULL); |
| 2008 | |
| 2009 | if (ioctl_result < 0) { |
| 2010 | /* Find out what happened if it failed. */ |
| 2011 | switch (ioctl_errno) { |
| 2012 | case EINTR: |
| 2013 | case EBADF: |
| 2014 | continue; |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 2015 | #ifdef FREEBSD |
| 2016 | case ENOTTY: |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 2017 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2018 | case ENOENT: |
| 2019 | droptcb(tcp); |
| 2020 | continue; |
| 2021 | default: |
| 2022 | perror("PIOCWSTOP"); |
| 2023 | exit(1); |
| 2024 | } |
| 2025 | } |
| 2026 | |
Wichert Akkerman | 2e4ffe5 | 2000-09-03 23:57:48 +0000 | [diff] [blame] | 2027 | #ifdef FREEBSD |
| 2028 | if ((tcp->flags & TCB_STARTUP) && (tcp->status.PR_WHY == PR_SYSEXIT)) { |
| 2029 | /* discard first event for a syscall we never entered */ |
| 2030 | IOCTL (tcp->pfd, PIOCRUN, 0); |
| 2031 | continue; |
| 2032 | } |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 2033 | #endif |
| 2034 | |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2035 | /* clear the just started flag */ |
| 2036 | tcp->flags &= ~TCB_STARTUP; |
| 2037 | |
| 2038 | /* set current output file */ |
| 2039 | outf = tcp->outf; |
| 2040 | |
| 2041 | if (cflag) { |
| 2042 | struct timeval stime; |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 2043 | #ifdef FREEBSD |
| 2044 | char buf[1024]; |
| 2045 | int len; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2046 | |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 2047 | if ((len = pread(tcp->pfd_status, buf, sizeof(buf) - 1, 0)) > 0) { |
| 2048 | buf[len] = '\0'; |
| 2049 | sscanf(buf, |
| 2050 | "%*s %*d %*d %*d %*d %*d,%*d %*s %*d,%*d %*d,%*d %ld,%ld", |
| 2051 | &stime.tv_sec, &stime.tv_usec); |
| 2052 | } else |
| 2053 | stime.tv_sec = stime.tv_usec = 0; |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 2054 | #else /* !FREEBSD */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2055 | stime.tv_sec = tcp->status.pr_stime.tv_sec; |
| 2056 | stime.tv_usec = tcp->status.pr_stime.tv_nsec/1000; |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 2057 | #endif /* !FREEBSD */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2058 | tv_sub(&tcp->dtime, &stime, &tcp->stime); |
| 2059 | tcp->stime = stime; |
| 2060 | } |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 2061 | what = tcp->status.PR_WHAT; |
| 2062 | switch (tcp->status.PR_WHY) { |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 2063 | #ifndef FREEBSD |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2064 | case PR_REQUESTED: |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 2065 | if (tcp->status.PR_FLAGS & PR_ASLEEP) { |
| 2066 | tcp->status.PR_WHY = PR_SYSENTRY; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2067 | if (trace_syscall(tcp) < 0) { |
| 2068 | fprintf(stderr, "syscall trouble\n"); |
| 2069 | exit(1); |
| 2070 | } |
| 2071 | } |
| 2072 | break; |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 2073 | #endif /* !FREEBSD */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2074 | case PR_SYSENTRY: |
Wichert Akkerman | 9dbf154 | 1999-11-26 13:11:29 +0000 | [diff] [blame] | 2075 | #ifdef POLL_HACK |
| 2076 | in_syscall = tcp; |
| 2077 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2078 | case PR_SYSEXIT: |
| 2079 | if (trace_syscall(tcp) < 0) { |
| 2080 | fprintf(stderr, "syscall trouble\n"); |
| 2081 | exit(1); |
| 2082 | } |
| 2083 | break; |
| 2084 | case PR_SIGNALLED: |
| 2085 | if (!cflag && (qual_flags[what] & QUAL_SIGNAL)) { |
| 2086 | printleader(tcp); |
| 2087 | tprintf("--- %s (%s) ---", |
Nate Sammons | ce780fc | 1999-03-29 23:23:13 +0000 | [diff] [blame] | 2088 | signame(what), strsignal(what)); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2089 | printtrailer(tcp); |
John Hughes | 5826589 | 2001-10-18 15:13:53 +0000 | [diff] [blame] | 2090 | #ifdef PR_INFO |
| 2091 | if (tcp->status.PR_INFO.si_signo == what) { |
| 2092 | printleader(tcp); |
| 2093 | tprintf(" siginfo="); |
| 2094 | printsiginfo(&tcp->status.PR_INFO, 1); |
| 2095 | printtrailer(tcp); |
| 2096 | } |
| 2097 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2098 | } |
| 2099 | break; |
| 2100 | case PR_FAULTED: |
| 2101 | if (!cflag && (qual_flags[what] & QUAL_FAULT)) { |
| 2102 | printleader(tcp); |
| 2103 | tprintf("=== FAULT %d ===", what); |
| 2104 | printtrailer(tcp); |
| 2105 | } |
| 2106 | break; |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 2107 | #ifdef FREEBSD |
| 2108 | case 0: /* handle case we polled for nothing */ |
| 2109 | continue; |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 2110 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2111 | default: |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 2112 | fprintf(stderr, "odd stop %d\n", tcp->status.PR_WHY); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2113 | exit(1); |
| 2114 | break; |
| 2115 | } |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 2116 | arg = 0; |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 2117 | #ifndef FREEBSD |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 2118 | if (IOCTL (tcp->pfd, PIOCRUN, &arg) < 0) { |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 2119 | #else |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 2120 | if (IOCTL (tcp->pfd, PIOCRUN, 0) < 0) { |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 2121 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2122 | perror("PIOCRUN"); |
| 2123 | exit(1); |
| 2124 | } |
| 2125 | } |
| 2126 | return 0; |
| 2127 | } |
| 2128 | |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 2129 | #else /* !USE_PROCFS */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2130 | |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2131 | #ifdef TCB_GROUP_EXITING |
| 2132 | /* Handle an exit detach or death signal that is taking all the |
| 2133 | related clone threads with it. This is called in three circumstances: |
| 2134 | SIG == -1 TCP has already died (TCB_ATTACHED is clear, strace is parent). |
| 2135 | SIG == 0 Continuing TCP will perform an exit_group syscall. |
| 2136 | SIG == other Continuing TCP with SIG will kill the process. |
| 2137 | */ |
| 2138 | static int |
| 2139 | handle_group_exit(struct tcb *tcp, int sig) |
| 2140 | { |
| 2141 | /* We need to locate our records of all the clone threads |
| 2142 | related to TCP, either its children or siblings. */ |
| 2143 | struct tcb *leader = ((tcp->flags & TCB_CLONE_THREAD) |
| 2144 | ? tcp->parent |
| 2145 | : tcp->nclone_detached > 0 |
| 2146 | ? tcp : NULL); |
| 2147 | |
| 2148 | if (sig < 0) { |
Roland McGrath | 0569095 | 2004-10-20 01:00:27 +0000 | [diff] [blame] | 2149 | if (leader != NULL && leader != tcp && |
| 2150 | !(leader->flags & TCB_GROUP_EXITING)) |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2151 | fprintf(stderr, |
| 2152 | "PANIC: handle_group_exit: %d leader %d\n", |
| 2153 | tcp->pid, leader ? leader->pid : -1); |
Roland McGrath | 0a46388 | 2007-07-05 18:43:16 +0000 | [diff] [blame] | 2154 | /* TCP no longer exists therefore you must not detach () it. */ |
Roland McGrath | 1bfd310 | 2007-08-03 10:02:00 +0000 | [diff] [blame] | 2155 | #ifndef USE_PROCFS |
| 2156 | resume_from_tcp (tcp); |
| 2157 | #endif |
Roland McGrath | 0a46388 | 2007-07-05 18:43:16 +0000 | [diff] [blame] | 2158 | droptcb(tcp); /* Already died. */ |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2159 | } |
| 2160 | else { |
Roland McGrath | a08a97e | 2005-08-03 11:23:46 +0000 | [diff] [blame] | 2161 | /* Mark that we are taking the process down. */ |
| 2162 | tcp->flags |= TCB_EXITING | TCB_GROUP_EXITING; |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2163 | if (tcp->flags & TCB_ATTACHED) { |
Roland McGrath | d6a32f1 | 2007-07-11 08:35:11 +0000 | [diff] [blame] | 2164 | detach(tcp, sig); |
Roland McGrath | 1bfd310 | 2007-08-03 10:02:00 +0000 | [diff] [blame] | 2165 | if (leader != NULL && leader != tcp) |
| 2166 | leader->flags |= TCB_GROUP_EXITING; |
Denys Vlasenko | 732d1bf | 2008-12-17 19:21:59 +0000 | [diff] [blame^] | 2167 | } else { |
| 2168 | if (ptrace_restart(PTRACE_CONT, tcp, sig) < 0) { |
| 2169 | cleanup(); |
| 2170 | return -1; |
| 2171 | } |
| 2172 | if (leader != NULL) { |
Roland McGrath | 0569095 | 2004-10-20 01:00:27 +0000 | [diff] [blame] | 2173 | leader->flags |= TCB_GROUP_EXITING; |
Denys Vlasenko | 732d1bf | 2008-12-17 19:21:59 +0000 | [diff] [blame^] | 2174 | if (leader != tcp) |
| 2175 | droptcb(tcp); |
| 2176 | } |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2177 | /* The leader will report to us as parent now, |
| 2178 | and then we'll get to the SIG==-1 case. */ |
| 2179 | return 0; |
| 2180 | } |
| 2181 | } |
| 2182 | |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2183 | return 0; |
| 2184 | } |
| 2185 | #endif |
| 2186 | |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2187 | static int |
| 2188 | trace() |
| 2189 | { |
| 2190 | int pid; |
| 2191 | int wait_errno; |
| 2192 | int status; |
| 2193 | struct tcb *tcp; |
| 2194 | #ifdef LINUX |
| 2195 | struct rusage ru; |
Wichert Akkerman | 2f1d87e | 2001-03-28 14:40:14 +0000 | [diff] [blame] | 2196 | #ifdef __WALL |
| 2197 | static int wait4_options = __WALL; |
| 2198 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2199 | #endif /* LINUX */ |
| 2200 | |
| 2201 | while (nprocs != 0) { |
Roland McGrath | 0220331 | 2007-06-11 22:06:31 +0000 | [diff] [blame] | 2202 | if (interrupted) |
| 2203 | return 0; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2204 | if (interactive) |
| 2205 | sigprocmask(SIG_SETMASK, &empty_set, NULL); |
| 2206 | #ifdef LINUX |
Wichert Akkerman | 2f1d87e | 2001-03-28 14:40:14 +0000 | [diff] [blame] | 2207 | #ifdef __WALL |
| 2208 | pid = wait4(-1, &status, wait4_options, cflag ? &ru : NULL); |
Roland McGrath | 5bc0555 | 2002-12-17 04:50:47 +0000 | [diff] [blame] | 2209 | if (pid < 0 && (wait4_options & __WALL) && errno == EINVAL) { |
Wichert Akkerman | 2f1d87e | 2001-03-28 14:40:14 +0000 | [diff] [blame] | 2210 | /* this kernel does not support __WALL */ |
| 2211 | wait4_options &= ~__WALL; |
| 2212 | errno = 0; |
| 2213 | pid = wait4(-1, &status, wait4_options, |
| 2214 | cflag ? &ru : NULL); |
| 2215 | } |
Roland McGrath | 5bc0555 | 2002-12-17 04:50:47 +0000 | [diff] [blame] | 2216 | if (pid < 0 && !(wait4_options & __WALL) && errno == ECHILD) { |
Wichert Akkerman | 2f1d87e | 2001-03-28 14:40:14 +0000 | [diff] [blame] | 2217 | /* most likely a "cloned" process */ |
| 2218 | pid = wait4(-1, &status, __WCLONE, |
| 2219 | cflag ? &ru : NULL); |
| 2220 | if (pid == -1) { |
| 2221 | fprintf(stderr, "strace: clone wait4 " |
| 2222 | "failed: %s\n", strerror(errno)); |
| 2223 | } |
| 2224 | } |
| 2225 | #else |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2226 | pid = wait4(-1, &status, 0, cflag ? &ru : NULL); |
Wichert Akkerman | 2f1d87e | 2001-03-28 14:40:14 +0000 | [diff] [blame] | 2227 | #endif /* __WALL */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2228 | #endif /* LINUX */ |
| 2229 | #ifdef SUNOS4 |
| 2230 | pid = wait(&status); |
| 2231 | #endif /* SUNOS4 */ |
| 2232 | wait_errno = errno; |
| 2233 | if (interactive) |
| 2234 | sigprocmask(SIG_BLOCK, &blocked_set, NULL); |
| 2235 | |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2236 | if (pid == -1) { |
| 2237 | switch (wait_errno) { |
| 2238 | case EINTR: |
| 2239 | continue; |
| 2240 | case ECHILD: |
| 2241 | /* |
| 2242 | * We would like to verify this case |
| 2243 | * but sometimes a race in Solbourne's |
| 2244 | * version of SunOS sometimes reports |
| 2245 | * ECHILD before sending us SIGCHILD. |
| 2246 | */ |
| 2247 | #if 0 |
| 2248 | if (nprocs == 0) |
| 2249 | return 0; |
| 2250 | fprintf(stderr, "strace: proc miscount\n"); |
| 2251 | exit(1); |
| 2252 | #endif |
| 2253 | return 0; |
| 2254 | default: |
| 2255 | errno = wait_errno; |
| 2256 | perror("strace: wait"); |
| 2257 | return -1; |
| 2258 | } |
| 2259 | } |
Dmitry V. Levin | 10de62b | 2006-12-13 21:45:31 +0000 | [diff] [blame] | 2260 | if (pid == popen_pid) { |
| 2261 | if (WIFEXITED(status) || WIFSIGNALED(status)) |
| 2262 | popen_pid = -1; |
| 2263 | continue; |
| 2264 | } |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2265 | if (debug) |
| 2266 | fprintf(stderr, " [wait(%#x) = %u]\n", status, pid); |
| 2267 | |
| 2268 | /* Look up `pid' in our table. */ |
| 2269 | if ((tcp = pid2tcb(pid)) == NULL) { |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2270 | #ifdef LINUX |
Roland McGrath | 41c4822 | 2008-07-18 00:25:10 +0000 | [diff] [blame] | 2271 | if (followfork) { |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2272 | /* This is needed to go with the CLONE_PTRACE |
| 2273 | changes in process.c/util.c: we might see |
| 2274 | the child's initial trap before we see the |
| 2275 | parent return from the clone syscall. |
| 2276 | Leave the child suspended until the parent |
| 2277 | returns from its system call. Only then |
| 2278 | will we have the association of parent and |
| 2279 | child so that we know how to do clearbpt |
| 2280 | in the child. */ |
Dmitry V. Levin | 76860f6 | 2006-10-11 22:55:25 +0000 | [diff] [blame] | 2281 | if (nprocs == tcbtabsize && |
| 2282 | expand_tcbtab()) |
| 2283 | tcp = NULL; |
| 2284 | else |
| 2285 | tcp = alloctcb(pid); |
| 2286 | if (tcp == NULL) { |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2287 | kill(pid, SIGKILL); /* XXX */ |
| 2288 | return 0; |
| 2289 | } |
| 2290 | tcp->flags |= TCB_ATTACHED | TCB_SUSPENDED; |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2291 | if (!qflag) |
| 2292 | fprintf(stderr, "\ |
| 2293 | Process %d attached (waiting for parent)\n", |
| 2294 | pid); |
Wichert Akkerman | 8b1b40c | 2000-02-03 21:58:30 +0000 | [diff] [blame] | 2295 | } |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2296 | else |
| 2297 | /* This can happen if a clone call used |
| 2298 | CLONE_PTRACE itself. */ |
Wichert Akkerman | 8b1b40c | 2000-02-03 21:58:30 +0000 | [diff] [blame] | 2299 | #endif |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2300 | { |
| 2301 | fprintf(stderr, "unknown pid: %u\n", pid); |
| 2302 | if (WIFSTOPPED(status)) |
| 2303 | ptrace(PTRACE_CONT, pid, (char *) 1, 0); |
| 2304 | exit(1); |
| 2305 | } |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2306 | } |
| 2307 | /* set current output file */ |
| 2308 | outf = tcp->outf; |
| 2309 | if (cflag) { |
| 2310 | #ifdef LINUX |
| 2311 | tv_sub(&tcp->dtime, &ru.ru_stime, &tcp->stime); |
| 2312 | tcp->stime = ru.ru_stime; |
| 2313 | #endif /* !LINUX */ |
| 2314 | } |
| 2315 | |
| 2316 | if (tcp->flags & TCB_SUSPENDED) { |
| 2317 | /* |
| 2318 | * Apparently, doing any ptrace() call on a stopped |
| 2319 | * process, provokes the kernel to report the process |
| 2320 | * status again on a subsequent wait(), even if the |
| 2321 | * process has not been actually restarted. |
| 2322 | * Since we have inspected the arguments of suspended |
| 2323 | * processes we end up here testing for this case. |
| 2324 | */ |
| 2325 | continue; |
| 2326 | } |
| 2327 | if (WIFSIGNALED(status)) { |
Dmitry V. Levin | a680965 | 2008-11-10 17:14:58 +0000 | [diff] [blame] | 2328 | if (pid == strace_child) |
| 2329 | exit_code = 0x100 | WTERMSIG(status); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2330 | if (!cflag |
| 2331 | && (qual_flags[WTERMSIG(status)] & QUAL_SIGNAL)) { |
| 2332 | printleader(tcp); |
Roland McGrath | 2efe879 | 2004-01-13 09:59:45 +0000 | [diff] [blame] | 2333 | tprintf("+++ killed by %s %s+++", |
| 2334 | signame(WTERMSIG(status)), |
| 2335 | #ifdef WCOREDUMP |
| 2336 | WCOREDUMP(status) ? "(core dumped) " : |
| 2337 | #endif |
| 2338 | ""); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2339 | printtrailer(tcp); |
| 2340 | } |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2341 | #ifdef TCB_GROUP_EXITING |
| 2342 | handle_group_exit(tcp, -1); |
| 2343 | #else |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2344 | droptcb(tcp); |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2345 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2346 | continue; |
| 2347 | } |
| 2348 | if (WIFEXITED(status)) { |
Dmitry V. Levin | a680965 | 2008-11-10 17:14:58 +0000 | [diff] [blame] | 2349 | if (pid == strace_child) |
| 2350 | exit_code = WEXITSTATUS(status); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2351 | if (debug) |
| 2352 | fprintf(stderr, "pid %u exited\n", pid); |
Roland McGrath | 0569095 | 2004-10-20 01:00:27 +0000 | [diff] [blame] | 2353 | if ((tcp->flags & TCB_ATTACHED) |
| 2354 | #ifdef TCB_GROUP_EXITING |
| 2355 | && !(tcp->parent && (tcp->parent->flags & |
| 2356 | TCB_GROUP_EXITING)) |
Roland McGrath | 1bfd310 | 2007-08-03 10:02:00 +0000 | [diff] [blame] | 2357 | && !(tcp->flags & TCB_GROUP_EXITING) |
Roland McGrath | 0569095 | 2004-10-20 01:00:27 +0000 | [diff] [blame] | 2358 | #endif |
| 2359 | ) |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2360 | fprintf(stderr, |
| 2361 | "PANIC: attached pid %u exited\n", |
| 2362 | pid); |
Roland McGrath | 0a39690 | 2003-06-10 03:05:53 +0000 | [diff] [blame] | 2363 | if (tcp == tcp_last) { |
| 2364 | if ((tcp->flags & (TCB_INSYSCALL|TCB_REPRINT)) |
| 2365 | == TCB_INSYSCALL) |
| 2366 | tprintf(" <unfinished ... exit status %d>\n", |
| 2367 | WEXITSTATUS(status)); |
| 2368 | tcp_last = NULL; |
| 2369 | } |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2370 | #ifdef TCB_GROUP_EXITING |
| 2371 | handle_group_exit(tcp, -1); |
| 2372 | #else |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2373 | droptcb(tcp); |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2374 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2375 | continue; |
| 2376 | } |
| 2377 | if (!WIFSTOPPED(status)) { |
| 2378 | fprintf(stderr, "PANIC: pid %u not stopped\n", pid); |
| 2379 | droptcb(tcp); |
| 2380 | continue; |
| 2381 | } |
| 2382 | if (debug) |
| 2383 | fprintf(stderr, "pid %u stopped, [%s]\n", |
Nate Sammons | ce780fc | 1999-03-29 23:23:13 +0000 | [diff] [blame] | 2384 | pid, signame(WSTOPSIG(status))); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2385 | |
Roland McGrath | 0220331 | 2007-06-11 22:06:31 +0000 | [diff] [blame] | 2386 | /* |
| 2387 | * Interestingly, the process may stop |
| 2388 | * with STOPSIG equal to some other signal |
| 2389 | * than SIGSTOP if we happend to attach |
| 2390 | * just before the process takes a signal. |
| 2391 | */ |
| 2392 | if ((tcp->flags & TCB_STARTUP) && WSTOPSIG(status) == SIGSTOP) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2393 | /* |
| 2394 | * This flag is there to keep us in sync. |
| 2395 | * Next time this process stops it should |
| 2396 | * really be entering a system call. |
| 2397 | */ |
| 2398 | tcp->flags &= ~TCB_STARTUP; |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2399 | if (tcp->flags & TCB_BPTSET) { |
Roland McGrath | 0220331 | 2007-06-11 22:06:31 +0000 | [diff] [blame] | 2400 | /* |
| 2401 | * One example is a breakpoint inherited from |
| 2402 | * parent through fork (). |
| 2403 | */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2404 | if (clearbpt(tcp) < 0) /* Pretty fatal */ { |
| 2405 | droptcb(tcp); |
| 2406 | cleanup(); |
| 2407 | return -1; |
| 2408 | } |
| 2409 | } |
| 2410 | goto tracing; |
| 2411 | } |
| 2412 | |
| 2413 | if (WSTOPSIG(status) != SIGTRAP) { |
| 2414 | if (WSTOPSIG(status) == SIGSTOP && |
| 2415 | (tcp->flags & TCB_SIGTRAPPED)) { |
| 2416 | /* |
| 2417 | * Trapped attempt to block SIGTRAP |
| 2418 | * Hope we are back in control now. |
| 2419 | */ |
| 2420 | tcp->flags &= ~(TCB_INSYSCALL | TCB_SIGTRAPPED); |
Denys Vlasenko | 732d1bf | 2008-12-17 19:21:59 +0000 | [diff] [blame^] | 2421 | if (ptrace_restart(PTRACE_SYSCALL, tcp, 0) < 0) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2422 | cleanup(); |
| 2423 | return -1; |
| 2424 | } |
| 2425 | continue; |
| 2426 | } |
| 2427 | if (!cflag |
| 2428 | && (qual_flags[WSTOPSIG(status)] & QUAL_SIGNAL)) { |
Jan Kratochvil | 1f94271 | 2008-08-06 21:38:52 +0000 | [diff] [blame] | 2429 | unsigned long addr = 0; |
| 2430 | long pc = 0; |
Dmitry V. Levin | 9633942 | 2006-10-11 23:11:43 +0000 | [diff] [blame] | 2431 | #if defined(PT_CR_IPSR) && defined(PT_CR_IIP) && defined(PT_GETSIGINFO) |
Wichert Akkerman | 7b3346b | 2001-10-09 23:47:38 +0000 | [diff] [blame] | 2432 | # define PSR_RI 41 |
| 2433 | struct siginfo si; |
Jan Kratochvil | 1f94271 | 2008-08-06 21:38:52 +0000 | [diff] [blame] | 2434 | long psr; |
Wichert Akkerman | 7b3346b | 2001-10-09 23:47:38 +0000 | [diff] [blame] | 2435 | |
Denys Vlasenko | 932fc7d | 2008-12-16 18:18:40 +0000 | [diff] [blame] | 2436 | upeek(tcp, PT_CR_IPSR, &psr); |
| 2437 | upeek(tcp, PT_CR_IIP, &pc); |
Wichert Akkerman | 7b3346b | 2001-10-09 23:47:38 +0000 | [diff] [blame] | 2438 | |
| 2439 | pc += (psr >> PSR_RI) & 0x3; |
| 2440 | ptrace(PT_GETSIGINFO, pid, 0, (long) &si); |
| 2441 | addr = (unsigned long) si.si_addr; |
Roland McGrath | 3a055d7 | 2005-03-06 22:24:29 +0000 | [diff] [blame] | 2442 | #elif defined PTRACE_GETSIGINFO |
| 2443 | if (WSTOPSIG(status) == SIGSEGV || |
| 2444 | WSTOPSIG(status) == SIGBUS) { |
| 2445 | siginfo_t si; |
| 2446 | if (ptrace(PTRACE_GETSIGINFO, pid, |
| 2447 | 0, &si) == 0) |
| 2448 | addr = (unsigned long) |
| 2449 | si.si_addr; |
| 2450 | } |
Wichert Akkerman | 7b3346b | 2001-10-09 23:47:38 +0000 | [diff] [blame] | 2451 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2452 | printleader(tcp); |
Wichert Akkerman | 7b3346b | 2001-10-09 23:47:38 +0000 | [diff] [blame] | 2453 | tprintf("--- %s (%s) @ %lx (%lx) ---", |
Nate Sammons | ce780fc | 1999-03-29 23:23:13 +0000 | [diff] [blame] | 2454 | signame(WSTOPSIG(status)), |
Wichert Akkerman | 7b3346b | 2001-10-09 23:47:38 +0000 | [diff] [blame] | 2455 | strsignal(WSTOPSIG(status)), pc, addr); |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2456 | printtrailer(tcp); |
| 2457 | } |
Roland McGrath | 0569095 | 2004-10-20 01:00:27 +0000 | [diff] [blame] | 2458 | if (((tcp->flags & TCB_ATTACHED) || |
| 2459 | tcp->nclone_threads > 0) && |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2460 | !sigishandled(tcp, WSTOPSIG(status))) { |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2461 | #ifdef TCB_GROUP_EXITING |
| 2462 | handle_group_exit(tcp, WSTOPSIG(status)); |
| 2463 | #else |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2464 | detach(tcp, WSTOPSIG(status)); |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2465 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2466 | continue; |
| 2467 | } |
Denys Vlasenko | 732d1bf | 2008-12-17 19:21:59 +0000 | [diff] [blame^] | 2468 | if (ptrace_restart(PTRACE_SYSCALL, tcp, WSTOPSIG(status)) < 0) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2469 | cleanup(); |
| 2470 | return -1; |
| 2471 | } |
| 2472 | tcp->flags &= ~TCB_SUSPENDED; |
| 2473 | continue; |
| 2474 | } |
Roland McGrath | 0220331 | 2007-06-11 22:06:31 +0000 | [diff] [blame] | 2475 | /* we handled the STATUS, we are permitted to interrupt now. */ |
| 2476 | if (interrupted) |
| 2477 | return 0; |
Denys Vlasenko | 732d1bf | 2008-12-17 19:21:59 +0000 | [diff] [blame^] | 2478 | if (trace_syscall(tcp) < 0 && !tcp->ptrace_errno) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2479 | if (tcp->flags & TCB_ATTACHED) |
| 2480 | detach(tcp, 0); |
| 2481 | else { |
| 2482 | ptrace(PTRACE_KILL, |
| 2483 | tcp->pid, (char *) 1, SIGTERM); |
| 2484 | droptcb(tcp); |
| 2485 | } |
| 2486 | continue; |
| 2487 | } |
| 2488 | if (tcp->flags & TCB_EXITING) { |
Roland McGrath | e85bbfe | 2003-01-09 06:53:31 +0000 | [diff] [blame] | 2489 | #ifdef TCB_GROUP_EXITING |
| 2490 | if (tcp->flags & TCB_GROUP_EXITING) { |
| 2491 | if (handle_group_exit(tcp, 0) < 0) |
| 2492 | return -1; |
| 2493 | continue; |
| 2494 | } |
| 2495 | #endif |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2496 | if (tcp->flags & TCB_ATTACHED) |
| 2497 | detach(tcp, 0); |
Denys Vlasenko | 732d1bf | 2008-12-17 19:21:59 +0000 | [diff] [blame^] | 2498 | else if (ptrace_restart(PTRACE_CONT, tcp, 0) < 0) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2499 | cleanup(); |
| 2500 | return -1; |
| 2501 | } |
| 2502 | continue; |
| 2503 | } |
| 2504 | if (tcp->flags & TCB_SUSPENDED) { |
| 2505 | if (!qflag) |
| 2506 | fprintf(stderr, "Process %u suspended\n", pid); |
| 2507 | continue; |
| 2508 | } |
| 2509 | tracing: |
Denys Vlasenko | 732d1bf | 2008-12-17 19:21:59 +0000 | [diff] [blame^] | 2510 | if (ptrace_restart(PTRACE_SYSCALL, tcp, 0) < 0) { |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2511 | cleanup(); |
| 2512 | return -1; |
| 2513 | } |
| 2514 | } |
| 2515 | return 0; |
| 2516 | } |
| 2517 | |
Wichert Akkerman | bf79f2e | 2000-09-01 21:03:06 +0000 | [diff] [blame] | 2518 | #endif /* !USE_PROCFS */ |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2519 | |
| 2520 | static int curcol; |
| 2521 | |
| 2522 | #ifdef __STDC__ |
| 2523 | #include <stdarg.h> |
| 2524 | #define VA_START(a, b) va_start(a, b) |
| 2525 | #else |
| 2526 | #include <varargs.h> |
| 2527 | #define VA_START(a, b) va_start(a) |
| 2528 | #endif |
| 2529 | |
| 2530 | void |
| 2531 | #ifdef __STDC__ |
| 2532 | tprintf(const char *fmt, ...) |
| 2533 | #else |
| 2534 | tprintf(fmt, va_alist) |
| 2535 | char *fmt; |
| 2536 | va_dcl |
| 2537 | #endif |
| 2538 | { |
| 2539 | va_list args; |
| 2540 | |
| 2541 | VA_START(args, fmt); |
Roland McGrath | b310a0c | 2003-11-06 23:41:22 +0000 | [diff] [blame] | 2542 | if (outf) { |
| 2543 | int n = vfprintf(outf, fmt, args); |
| 2544 | if (n < 0 && outf != stderr) |
| 2545 | perror(outfname == NULL |
| 2546 | ? "<writing to pipe>" : outfname); |
| 2547 | else |
| 2548 | curcol += n; |
| 2549 | } |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2550 | va_end(args); |
| 2551 | return; |
| 2552 | } |
| 2553 | |
| 2554 | void |
| 2555 | printleader(tcp) |
| 2556 | struct tcb *tcp; |
| 2557 | { |
Denys Vlasenko | 732d1bf | 2008-12-17 19:21:59 +0000 | [diff] [blame^] | 2558 | if (tcp_last) { |
| 2559 | if (tcp_last->ptrace_errno) { |
| 2560 | if (tcp_last->flags & TCB_INSYSCALL) { |
| 2561 | tprintf(" <unavailable>)"); |
| 2562 | tabto(acolumn); |
| 2563 | } |
| 2564 | tprintf("= ? <unavailable>\n"); |
| 2565 | tcp_last->ptrace_errno = 0; |
| 2566 | } else if (!outfname || followfork < 2 || tcp_last == tcp) { |
| 2567 | tcp_last->flags |= TCB_REPRINT; |
| 2568 | tprintf(" <unfinished ...>\n"); |
| 2569 | } |
Wichert Akkerman | 76baf7c | 1999-02-19 00:21:36 +0000 | [diff] [blame] | 2570 | } |
| 2571 | curcol = 0; |
| 2572 | if ((followfork == 1 || pflag_seen > 1) && outfname) |
| 2573 | tprintf("%-5d ", tcp->pid); |
| 2574 | else if (nprocs > 1 && !outfname) |
| 2575 | tprintf("[pid %5u] ", tcp->pid); |
| 2576 | if (tflag) { |
| 2577 | char str[sizeof("HH:MM:SS")]; |
| 2578 | struct timeval tv, dtv; |
| 2579 | static struct timeval otv; |
| 2580 | |
| 2581 | gettimeofday(&tv, NULL); |
| 2582 | if (rflag) { |
| 2583 | if (otv.tv_sec == 0) |
| 2584 | otv = tv; |
| 2585 | tv_sub(&dtv, &tv, &otv); |
| 2586 | tprintf("%6ld.%06ld ", |
| 2587 | (long) dtv.tv_sec, (long) dtv.tv_usec); |
| 2588 | otv = tv; |
| 2589 | } |
| 2590 | else if (tflag > 2) { |
| 2591 | tprintf("%ld.%06ld ", |
| 2592 | (long) tv.tv_sec, (long) tv.tv_usec); |
| 2593 | } |
| 2594 | else { |
| 2595 | time_t local = tv.tv_sec; |
| 2596 | strftime(str, sizeof(str), "%T", localtime(&local)); |
| 2597 | if (tflag > 1) |
| 2598 | tprintf("%s.%06ld ", str, (long) tv.tv_usec); |
| 2599 | else |
| 2600 | tprintf("%s ", str); |
| 2601 | } |
| 2602 | } |
| 2603 | if (iflag) |
| 2604 | printcall(tcp); |
| 2605 | } |
| 2606 | |
| 2607 | void |
| 2608 | tabto(col) |
| 2609 | int col; |
| 2610 | { |
| 2611 | if (curcol < col) |
| 2612 | tprintf("%*s", col - curcol, ""); |
| 2613 | } |
| 2614 | |
| 2615 | void |
| 2616 | printtrailer(tcp) |
| 2617 | struct tcb *tcp; |
| 2618 | { |
| 2619 | tprintf("\n"); |
| 2620 | tcp_last = NULL; |
| 2621 | } |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 2622 | |
Wichert Akkerman | ea78f0f | 1999-11-29 15:34:02 +0000 | [diff] [blame] | 2623 | #ifdef HAVE_MP_PROCFS |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 2624 | |
| 2625 | int mp_ioctl (int fd, int cmd, void *arg, int size) { |
| 2626 | |
| 2627 | struct iovec iov[2]; |
| 2628 | int n = 1; |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 2629 | |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 2630 | iov[0].iov_base = &cmd; |
| 2631 | iov[0].iov_len = sizeof cmd; |
| 2632 | if (arg) { |
| 2633 | ++n; |
| 2634 | iov[1].iov_base = arg; |
| 2635 | iov[1].iov_len = size; |
| 2636 | } |
Roland McGrath | 553a609 | 2002-12-16 20:40:39 +0000 | [diff] [blame] | 2637 | |
Wichert Akkerman | 9ce1a63 | 1999-08-29 23:15:07 +0000 | [diff] [blame] | 2638 | return writev (fd, iov, n); |
| 2639 | } |
| 2640 | |
| 2641 | #endif |