Initial revision
diff --git a/strace.c b/strace.c
new file mode 100644
index 0000000..5b23f81
--- /dev/null
+++ b/strace.c
@@ -0,0 +1,1653 @@
+/*
+ * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
+ * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
+ * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $Id$
+ */
+
+#include "defs.h"
+
+#include <signal.h>
+#include <errno.h>
+#include <sys/param.h>
+#include <fcntl.h>
+#include <sys/resource.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <pwd.h>
+#include <grp.h>
+#include <string.h>
+
+#ifdef SVR4
+#include <sys/stropts.h>
+#include <poll.h>
+#endif
+
+int debug = 0, followfork = 0, followvfork = 0, interactive = 0;
+int rflag = 0, tflag = 0, dtime = 0, cflag = 0;
+int iflag = 0, xflag = 0, qflag = 0;
+int pflag_seen = 0;
+
+char *username = NULL;
+uid_t run_uid;
+gid_t run_gid;
+
+int acolumn = DEFAULT_ACOLUMN;
+int max_strlen = DEFAULT_STRLEN;
+char *outfname = NULL;
+FILE *outf;
+struct tcb tcbtab[MAX_PROCS];
+int nprocs;
+char *progname;
+extern char version[];
+extern char **environ;
+
+static struct tcb *pid2tcb P((int pid));
+static int trace P((void));
+static void cleanup P((void));
+static void interrupt P((int sig));
+static sigset_t empty_set, blocked_set;
+
+#ifdef HAVE_SIG_ATOMIC_T
+static volatile sig_atomic_t interrupted;
+#else /* !HAVE_SIG_ATOMIC_T */
+#ifdef __STDC__
+static volatile int interrupted;
+#else /* !__STDC__ */
+static int interrupted;
+#endif /* !__STDC__ */
+#endif /* !HAVE_SIG_ATOMIC_T */
+
+#ifdef SVR4
+
+static struct tcb *pfd2tcb P((int pfd));
+static void reaper P((int sig));
+static void rebuild_pollv P((void));
+struct pollfd pollv[MAX_PROCS];
+
+#ifndef HAVE_POLLABLE_PROCFS
+
+static void proc_poll_open P((void));
+static void proc_poller P((int pfd));
+
+struct proc_pollfd {
+ int fd;
+ int revents;
+ int pid;
+};
+
+static int poller_pid;
+static int proc_poll_pipe[2] = { -1, -1 };
+
+#endif /* !HAVE_POLLABLE_PROCFS */
+
+#endif /* SVR4 */
+
+static void
+usage(ofp, exitval)
+FILE *ofp;
+int exitval;
+{
+ fprintf(ofp, "\
+usage: strace [-dffhiqrtttTvVxx] [-a column] [-e expr] ... [-o file]\n\
+ [-p pid] ... [-s strsize] [-u username] [command [arg ...]]\n\
+ or: strace -c [-e expr] ... [-O overhead] [-S sortby] [command [arg ...]]\n\
+-c -- count time, calls, and errors for each syscall and report summary\n\
+-f -- follow forks, -ff -- with output into separate files\n\
+-F -- attempt to follow vforks, -h -- print help message\n\
+-i -- print instruction pointer at time of syscall\n\
+-q -- suppress messages about attaching, detaching, etc.\n\
+-r -- print relative timestamp, -t -- absolute timestamp, -tt -- with usecs\n\
+-T -- print time spent in each syscall, -V -- print version\n\
+-v -- verbose mode: print unabbreviated argv, stat, termio[s], etc. args\n\
+-x -- print non-ascii strings in hex, -xx -- print all strings in hex\n\
+-a column -- alignment COLUMN for printing syscall results (default %d)\n\
+-e expr -- a qualifying expression: option=[!]all or option=[!]val1[,val2]...\n\
+ options: trace, abbrev, verbose, raw, signal, read, or write\n\
+-o file -- send trace output to FILE instead of stderr\n\
+-O overhead -- set overhead for tracing syscalls to OVERHEAD usecs\n\
+-p pid -- trace process with process id PID, may be repeated\n\
+-s strsize -- limit length of print strings to STRSIZE chars (default %d)\n\
+-S sortby -- sort syscall counts by: time, calls, name, nothing (default %s)\n\
+-u username -- run command as username handling setuid and/or setgid\n\
+", DEFAULT_ACOLUMN, DEFAULT_STRLEN, DEFAULT_SORTBY);
+ exit(exitval);
+}
+
+#ifdef SVR4
+#ifdef MIPS
+void
+foobar()
+{
+}
+#endif /* MIPS */
+#endif /* SVR4 */
+
+int
+main(argc, argv)
+int argc;
+char *argv[];
+{
+ extern int optind;
+ extern char *optarg;
+ struct tcb *tcp;
+ int c, pid = 0;
+ struct sigaction sa;
+
+ static char buf[BUFSIZ];
+
+ progname = argv[0];
+ outf = stderr;
+ interactive = 1;
+ qualify("trace=all");
+ qualify("abbrev=all");
+ qualify("verbose=all");
+ qualify("signal=all");
+ set_sortby(DEFAULT_SORTBY);
+ set_personality(DEFAULT_PERSONALITY);
+ while ((c = getopt(argc, argv,
+ "+cdfFhiqrtTvVxa:e:o:O:p:s:S:u:")) != EOF) {
+ switch (c) {
+ case 'c':
+ cflag++;
+ dtime++;
+ break;
+ case 'd':
+ debug++;
+ break;
+ case 'f':
+ followfork++;
+ break;
+ case 'F':
+ followvfork++;
+ break;
+ case 'h':
+ usage(stdout, 0);
+ break;
+ case 'i':
+ iflag++;
+ break;
+ case 'q':
+ qflag++;
+ break;
+ case 'r':
+ rflag++;
+ tflag++;
+ break;
+ case 't':
+ tflag++;
+ break;
+ case 'T':
+ dtime++;
+ break;
+ case 'x':
+ xflag++;
+ break;
+ case 'v':
+ qualify("abbrev=none");
+ break;
+ case 'V':
+ printf("%s\n", version);
+ exit(0);
+ break;
+ case 'a':
+ acolumn = atoi(optarg);
+ break;
+ case 'e':
+ qualify(optarg);
+ break;
+ case 'o':
+ outfname = strdup(optarg);
+ break;
+ case 'O':
+ set_overhead(atoi(optarg));
+ break;
+ case 'p':
+ if ((pid = atoi(optarg)) == 0) {
+ fprintf(stderr, "%s: Invalid process id: %s\n",
+ progname, optarg);
+ break;
+ }
+ if (pid == getpid()) {
+ fprintf(stderr, "%s: I'm sorry, I can't let you do that, Dave.", progname);
+ break;
+ }
+ if ((tcp = alloctcb(pid)) == NULL) {
+ fprintf(stderr, "%s: tcb table full, please recompile strace\n",
+ progname);
+ exit(1);
+ }
+ tcp->flags |= TCB_ATTACHED;
+ pflag_seen++;
+ break;
+ case 's':
+ max_strlen = atoi(optarg);
+ break;
+ case 'S':
+ set_sortby(optarg);
+ break;
+ case 'u':
+ username = strdup(optarg);
+ break;
+ default:
+ usage(stderr, 1);
+ break;
+ }
+ }
+
+ /* See if they want to run as another user. */
+ if (username != NULL) {
+ struct passwd *pent;
+
+ if (getuid() != 0 || geteuid() != 0) {
+ fprintf(stderr,
+ "%s: you must be root to use the -u option\n",
+ progname);
+ exit(1);
+ }
+ if ((pent = getpwnam(username)) == NULL) {
+ fprintf(stderr, "%s: cannot find user `%s'\n",
+ progname, optarg);
+ exit(1);
+ }
+ run_uid = pent->pw_uid;
+ run_gid = pent->pw_gid;
+ }
+ else {
+ run_uid = getuid();
+ run_gid = getgid();
+ }
+
+#ifndef SVR4
+ setreuid(geteuid(), getuid());
+#endif
+
+ /* See if they want to pipe the output. */
+ if (outfname && (outfname[0] == '|' || outfname[0] == '!')) {
+ if ((outf = popen(outfname + 1, "w")) == NULL) {
+ fprintf(stderr, "%s: can't popen '%s': %s\n",
+ progname, outfname + 1, strerror(errno));
+ exit(1);
+ }
+ free(outfname);
+ outfname = NULL;
+ }
+
+ /* Check if they want to redirect the output. */
+ if (outfname) {
+ if ((outf = fopen(outfname, "w")) == NULL) {
+ fprintf(stderr, "%s: can't fopen '%s': %s\n",
+ progname, outfname, strerror(errno));
+ exit(1);
+ }
+ }
+
+#ifndef SVR4
+ setreuid(geteuid(), getuid());
+#endif
+
+ if (!outfname) {
+ qflag = 1;
+ setvbuf(outf, buf, _IOLBF, BUFSIZ);
+ }
+ else if (optind < argc)
+ interactive = 0;
+ else
+ qflag = 1;
+
+ for (c = 0, tcp = tcbtab; c < MAX_PROCS; c++, tcp++) {
+ /* Reinitialize the output since it may have changed. */
+ tcp->outf = outf;
+ if (!(tcp->flags & TCB_INUSE) || !(tcp->flags & TCB_ATTACHED))
+ continue;
+#ifdef SVR4
+ if (proc_open(tcp, 1) < 0) {
+ fprintf(stderr, "trouble opening proc file\n");
+ droptcb(tcp);
+ continue;
+ }
+#else /* !SVR4 */
+ if (ptrace(PTRACE_ATTACH, tcp->pid, (char *) 1, 0) < 0) {
+ perror("attach: ptrace(PTRACE_ATTACH, ...)");
+ droptcb(tcp);
+ continue;
+ }
+#endif /* !SVR4 */
+ if (!qflag)
+ fprintf(stderr,
+ "Process %u attached - interrupt to quit\n",
+ pid);
+ }
+
+ if (optind < argc) {
+ struct stat statbuf;
+ char *filename;
+ char pathname[MAXPATHLEN];
+
+ filename = argv[optind];
+ if (strchr(filename, '/'))
+ strcpy(pathname, filename);
+#ifdef USE_DEBUGGING_EXEC
+ /*
+ * Debuggers customarily check the current directory
+ * first regardless of the path but doing that gives
+ * security geeks a panic attack.
+ */
+ else if (stat(filename, &statbuf) == 0)
+ strcpy(pathname, filename);
+#endif /* USE_DEBUGGING_EXEC */
+ else {
+ char *path;
+ int m, n, len;
+
+ for (path = getenv("PATH"); path && *path; path += m) {
+ if (strchr(path, ':')) {
+ n = strchr(path, ':') - path;
+ m = n + 1;
+ }
+ else
+ m = n = strlen(path);
+ if (n == 0) {
+ getcwd(pathname, MAXPATHLEN);
+ len = strlen(pathname);
+ }
+ else {
+ strncpy(pathname, path, n);
+ len = n;
+ }
+ if (len && pathname[len - 1] != '/')
+ pathname[len++] = '/';
+ strcpy(pathname + len, filename);
+ if (stat(pathname, &statbuf) == 0)
+ break;
+ }
+ }
+ if (stat(pathname, &statbuf) < 0) {
+ fprintf(stderr, "%s: %s: command not found\n",
+ progname, filename);
+ exit(1);
+ }
+ switch (pid = fork()) {
+ case -1:
+ perror("strace: fork");
+ cleanup();
+ exit(1);
+ break;
+ case 0: {
+#ifdef SVR4
+#ifdef MIPS
+ /* Kludge for SGI, see proc_open for details. */
+ sa.sa_handler = foobar;
+ sa.sa_flags = 0;
+ sigemptyset(&sa.sa_mask);
+ sigaction(SIGINT, &sa, NULL);
+#endif /* MIPS */
+ pause();
+#else /* !SVR4 */
+ if (ptrace(PTRACE_TRACEME, 0, (char *) 1, 0) < 0) {
+ perror("strace: ptrace(PTRACE_TRACEME, ...)");
+ return -1;
+ }
+ if (debug)
+ kill(getpid(), SIGSTOP);
+
+ if (username != NULL || geteuid() == 0) {
+ uid_t run_euid = run_uid;
+ gid_t run_egid = run_gid;
+
+ if (statbuf.st_mode & S_ISUID)
+ run_euid = statbuf.st_uid;
+ if (statbuf.st_mode & S_ISGID)
+ run_egid = statbuf.st_gid;
+
+ /*
+ * It is important to set groups before we
+ * lose privileges on setuid.
+ */
+ if (username != NULL
+ && initgroups(username, run_gid) < 0) {
+ perror("initgroups");
+ exit(1);
+ }
+ if (setregid(run_gid, run_egid) < 0) {
+ perror("setregid");
+ exit(1);
+ }
+ if (setreuid(run_uid, run_euid) < 0) {
+ perror("setreuid");
+ exit(1);
+ }
+ }
+ else
+ setreuid(run_uid, run_uid);
+#endif /* !SVR4 */
+
+ execv(pathname, &argv[optind]);
+ perror("strace: exec");
+ _exit(1);
+ break;
+ }
+ default:
+ if ((tcp = alloctcb(pid)) == NULL) {
+ fprintf(stderr, "tcb table full\n");
+ cleanup();
+ exit(1);
+ }
+#ifdef SVR4
+ if (proc_open(tcp, 0) < 0) {
+ fprintf(stderr, "trouble opening proc file\n");
+ cleanup();
+ exit(1);
+ }
+#endif /* SVR4 */
+#ifndef SVR4
+ fake_execve(tcp, pathname, &argv[optind], environ);
+#endif
+ break;
+ }
+ }
+ else if (pflag_seen == 0)
+ usage(stderr, 1);
+
+ sigemptyset(&empty_set);
+ sigemptyset(&blocked_set);
+ sa.sa_handler = SIG_IGN;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = 0;
+ sigaction(SIGTTOU, &sa, NULL);
+ sigaction(SIGTTIN, &sa, NULL);
+ if (interactive) {
+ sigaddset(&blocked_set, SIGHUP);
+ sigaddset(&blocked_set, SIGINT);
+ sigaddset(&blocked_set, SIGQUIT);
+ sigaddset(&blocked_set, SIGPIPE);
+ sigaddset(&blocked_set, SIGTERM);
+ sa.sa_handler = interrupt;
+#ifdef SUNOS4
+ /* POSIX signals on sunos4.1 are a little broken. */
+ sa.sa_flags = SA_INTERRUPT;
+#endif /* SUNOS4 */
+ }
+ sigaction(SIGHUP, &sa, NULL);
+ sigaction(SIGINT, &sa, NULL);
+ sigaction(SIGQUIT, &sa, NULL);
+ sigaction(SIGPIPE, &sa, NULL);
+ sigaction(SIGTERM, &sa, NULL);
+#ifdef SVR4
+ sa.sa_handler = reaper;
+ sigaction(SIGCHLD, &sa, NULL);
+#endif /* SVR4 */
+
+ if (trace() < 0)
+ exit(1);
+ cleanup();
+ exit(0);
+}
+
+void
+newoutf(tcp)
+struct tcb *tcp;
+{
+ char name[MAXPATHLEN];
+ FILE *fp;
+
+ if (outfname && followfork > 1) {
+ sprintf(name, "%s.%u", outfname, tcp->pid);
+#ifndef SVR4
+ setreuid(geteuid(), getuid());
+#endif
+ fp = fopen(name, "w");
+#ifndef SVR4
+ setreuid(geteuid(), getuid());
+#endif
+ if (fp == NULL) {
+ perror("fopen");
+ return;
+ }
+ tcp->outf = fp;
+ }
+ return;
+}
+
+struct tcb *
+alloctcb(pid)
+int pid;
+{
+ int i;
+ struct tcb *tcp;
+
+ for (i = 0, tcp = tcbtab; i < MAX_PROCS; i++, tcp++) {
+ if ((tcp->flags & TCB_INUSE) == 0) {
+ tcp->pid = pid;
+ tcp->parent = NULL;
+ tcp->nchildren = 0;
+ tcp->flags = TCB_INUSE | TCB_STARTUP;
+ tcp->outf = outf; /* Initialise to current out file */
+ tcp->stime.tv_sec = 0;
+ tcp->stime.tv_usec = 0;
+ tcp->pfd = -1;
+ nprocs++;
+ return tcp;
+ }
+ }
+ return NULL;
+}
+
+#ifdef SVR4
+
+int
+proc_open(tcp, attaching)
+struct tcb *tcp;
+int attaching;
+{
+ char proc[32];
+ long arg;
+ sysset_t sc_enter, sc_exit;
+ sigset_t signals;
+ fltset_t faults;
+#ifndef MIPS
+ prrun_t run;
+#endif
+#ifndef HAVE_POLLABLE_PROCFS
+ static int last_pfd;
+#endif
+
+ /* Open the process pseudo-file in /proc. */
+ sprintf(proc, "/proc/%d", tcp->pid);
+ if ((tcp->pfd = open(proc, O_RDWR|O_EXCL)) < 0) {
+ perror("strace: open(\"/proc/...\", ...)");
+ return -1;
+ }
+ rebuild_pollv();
+ if (!attaching) {
+ /*
+ * Wait for the child to pause. Because of a race
+ * condition we have to poll for the event.
+ */
+ for (;;) {
+ if (ioctl(tcp->pfd, PIOCSTATUS, &tcp->status) < 0) {
+ perror("strace: PIOCSTATUS");
+ return -1;
+ }
+ if (tcp->status.pr_flags & PR_ASLEEP)
+ break;
+ }
+ }
+ /* Stop the process so that we own the stop. */
+ if (ioctl(tcp->pfd, PIOCSTOP, &tcp->status) < 0) {
+ perror("strace: PIOCSTOP");
+ return -1;
+ }
+ if ((arg = fcntl(tcp->pfd, F_GETFD)) < 0) {
+ perror("F_GETFD");
+ return -1;
+ }
+ if (fcntl(tcp->pfd, F_SETFD, arg|FD_CLOEXEC) < 0) {
+ perror("F_SETFD");
+ return -1;
+ }
+#ifdef PIOCSET
+ /* Set Run-on-Last-Close. */
+ arg = PR_RLC;
+ if (ioctl(tcp->pfd, PIOCSET, &arg) < 0) {
+ perror("PIOCSET PR_RLC");
+ return -1;
+ }
+ /* Set or Reset Inherit-on-Fork. */
+ arg = PR_FORK;
+ if (ioctl(tcp->pfd, followfork ? PIOCSET : PIOCRESET, &arg) < 0) {
+ perror("PIOC{SET,RESET} PR_FORK");
+ return -1;
+ }
+#else /* !PIOCSET */
+ if (ioctl(tcp->pfd, PIOCSRLC) < 0) {
+ perror("PIOCSRLC");
+ return -1;
+ }
+ if (ioctl(tcp->pfd, followfork ? PIOCSFORK : PIOCRFORK) < 0) {
+ perror("PIOC{S,R}FORK");
+ return -1;
+ }
+#endif /* !PIOCSET */
+ /* Enable all syscall entries. */
+ prfillset(&sc_enter);
+ if (ioctl(tcp->pfd, PIOCSENTRY, &sc_enter) < 0) {
+ perror("PIOCSENTRY");
+ return -1;
+ }
+ /* Enable all syscall exits. */
+ prfillset(&sc_exit);
+ if (ioctl(tcp->pfd, PIOCSEXIT, &sc_exit) < 0) {
+ perror("PIOSEXIT");
+ return -1;
+ }
+ /* Enable all signals. */
+ prfillset(&signals);
+ if (ioctl(tcp->pfd, PIOCSTRACE, &signals) < 0) {
+ perror("PIOCSTRACE");
+ return -1;
+ }
+ /* Enable all faults. */
+ prfillset(&faults);
+ if (ioctl(tcp->pfd, PIOCSFAULT, &faults) < 0) {
+ perror("PIOCSFAULT");
+ return -1;
+ }
+ if (!attaching) {
+#ifdef MIPS
+ /*
+ * The SGI PRSABORT doesn't work for pause() so
+ * we send it a caught signal to wake it up.
+ */
+ kill(tcp->pid, SIGINT);
+#else /* !MIPS */
+ /* The child is in a pause(), abort it. */
+ run.pr_flags = PRSABORT;
+ if (ioctl(tcp->pfd, PIOCRUN, &run) < 0) {
+ perror("PIOCRUN");
+ return -1;
+ }
+#endif /* !MIPS */
+ for (;;) {
+ /* Wait for the child to do something. */
+ if (ioctl(tcp->pfd, PIOCWSTOP, &tcp->status) < 0) {
+ perror("PIOCWSTOP");
+ return -1;
+ }
+ if (tcp->status.pr_why == PR_SYSENTRY) {
+#ifdef HAVE_PR_SYSCALL
+ int scno = tcp->status.pr_syscall;
+#else /* !HAVE_PR_SYSCALL */
+ int scno = tcp->status.pr_what;
+#endif /* !HAVE_PR_SYSCALL */
+ if (scno == SYS_execve)
+ break;
+ }
+ /* Set it running: maybe execve will be next. */
+ if (ioctl(tcp->pfd, PIOCRUN, NULL) < 0) {
+ perror("PIOCRUN");
+ return -1;
+ }
+ }
+ }
+#ifndef HAVE_POLLABLE_PROCFS
+ if (proc_poll_pipe[0] != -1)
+ proc_poller(tcp->pfd);
+ else if (nprocs > 1) {
+ proc_poll_open();
+ proc_poller(last_pfd);
+ proc_poller(tcp->pfd);
+ }
+ last_pfd = tcp->pfd;
+#endif /* !HAVE_POLLABLE_PROCFS */
+ return 0;
+}
+
+#endif /* SVR4 */
+
+static struct tcb *
+pid2tcb(pid)
+int pid;
+{
+ int i;
+ struct tcb *tcp;
+
+ for (i = 0, tcp = tcbtab; i < MAX_PROCS; i++, tcp++) {
+ if (pid && tcp->pid != pid)
+ continue;
+ if (tcp->flags & TCB_INUSE)
+ return tcp;
+ }
+ return NULL;
+}
+
+#ifdef SVR4
+
+static struct tcb *
+pfd2tcb(pfd)
+int pfd;
+{
+ int i;
+ struct tcb *tcp;
+
+ for (i = 0, tcp = tcbtab; i < MAX_PROCS; i++, tcp++) {
+ if (tcp->pfd != pfd)
+ continue;
+ if (tcp->flags & TCB_INUSE)
+ return tcp;
+ }
+ return NULL;
+}
+
+#endif /* SVR4 */
+
+void
+droptcb(tcp)
+struct tcb *tcp;
+{
+ if (tcp->pid == 0)
+ return;
+ nprocs--;
+ tcp->pid = 0;
+ tcp->flags = 0;
+ if (tcp->pfd != -1) {
+ close(tcp->pfd);
+ tcp->pfd = -1;
+#ifdef SVR4
+ rebuild_pollv();
+#endif
+ }
+ if (tcp->parent != NULL) {
+ tcp->parent->nchildren--;
+ tcp->parent = NULL;
+ }
+#if 0
+ if (tcp->outf != stderr)
+ fclose(tcp->outf);
+#endif
+ tcp->outf = 0;
+}
+
+#ifndef SVR4
+
+static int
+resume(tcp)
+struct tcb *tcp;
+{
+ if (tcp == NULL)
+ return -1;
+
+ if (!(tcp->flags & TCB_SUSPENDED)) {
+ fprintf(stderr, "PANIC: pid %u not suspended\n", tcp->pid);
+ return -1;
+ }
+ tcp->flags &= ~TCB_SUSPENDED;
+
+ if (ptrace(PTRACE_SYSCALL, tcp->pid, (char *) 1, 0) < 0) {
+ perror("resume: ptrace(PTRACE_SYSCALL, ...)");
+ return -1;
+ }
+
+ if (!qflag)
+ fprintf(stderr, "Process %u resumed\n", tcp->pid);
+ return 0;
+}
+
+#endif /* !SVR4 */
+
+/* detach traced process; continue with sig */
+
+static int
+detach(tcp, sig)
+struct tcb *tcp;
+int sig;
+{
+ int error = 0;
+#ifdef LINUX
+ int status;
+#endif
+
+ if (tcp->flags & TCB_BPTSET)
+ sig = SIGKILL;
+
+#ifdef LINUX
+ /*
+ * Linux wrongly insists the child be stopped
+ * before detaching. Arghh. We go through hoops
+ * to make a clean break of things.
+ */
+ if ((error = ptrace(PTRACE_DETACH, tcp->pid, (char *) 1, sig)) == 0) {
+ /* On a clear day, you can see forever. */
+ }
+ else if (errno != ESRCH) {
+ /* Shouldn't happen. */
+ perror("detach: ptrace(PTRACE_DETACH, ...)");
+ }
+ else if (kill(tcp->pid, 0) < 0) {
+ if (errno != ESRCH)
+ perror("detach: checking sanity");
+ }
+ else if (kill(tcp->pid, SIGSTOP) < 0) {
+ if (errno != ESRCH)
+ perror("detach: stopping child");
+ }
+ else {
+ for (;;) {
+ if (waitpid(tcp->pid, &status, 0) < 0) {
+ if (errno != ECHILD)
+ perror("detach: waiting");
+ break;
+ }
+ if (!WIFSTOPPED(status)) {
+ /* Au revoir, mon ami. */
+ break;
+ }
+ if (WSTOPSIG(status) == SIGSTOP) {
+ if ((error = ptrace(PTRACE_DETACH,
+ tcp->pid, (char *) 1, sig)) < 0) {
+ if (errno != ESRCH)
+ perror("detach: ptrace(PTRACE_DETACH, ...)");
+ /* I died trying. */
+ }
+ break;
+ }
+ if ((error = ptrace(PTRACE_CONT, tcp->pid, (char *) 1,
+ WSTOPSIG(status) == SIGTRAP ?
+ 0 : WSTOPSIG(status))) < 0) {
+ if (errno != ESRCH)
+ perror("detach: ptrace(PTRACE_CONT, ...)");
+ break;
+ }
+ }
+ }
+#endif /* LINUX */
+
+#if defined(SUNOS4)
+ /* PTRACE_DETACH won't respect `sig' argument, so we post it here. */
+ if (sig && kill(tcp->pid, sig) < 0)
+ perror("detach: kill");
+ sig = 0;
+ if ((error = ptrace(PTRACE_DETACH, tcp->pid, (char *) 1, sig)) < 0)
+ perror("detach: ptrace(PTRACE_DETACH, ...)");
+#endif /* SUNOS4 */
+
+#ifndef SVR4
+ if (waiting_parent(tcp))
+ error = resume(tcp->parent);
+#endif /* !SVR4 */
+
+ if (!qflag)
+ fprintf(stderr, "Process %u detached\n", tcp->pid);
+
+ droptcb(tcp);
+ return error;
+}
+
+#ifdef SVR4
+
+static void
+reaper(sig)
+int sig;
+{
+ int pid;
+ int status;
+
+ while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
+#if 0
+ struct tcb *tcp;
+
+ tcp = pid2tcb(pid);
+ if (tcp)
+ droptcb(tcp);
+#endif
+ }
+}
+
+#endif /* SVR4 */
+
+static void
+cleanup()
+{
+ int i;
+ struct tcb *tcp;
+
+ for (i = 0, tcp = tcbtab; i < MAX_PROCS; i++, tcp++) {
+ if (!(tcp->flags & TCB_INUSE))
+ continue;
+ if (debug)
+ fprintf(stderr,
+ "cleanup: looking at pid %u\n", tcp->pid);
+ if (tcp_last &&
+ (!outfname || followfork < 2 || tcp_last == tcp)) {
+ tprintf(" <unfinished ...>\n");
+ tcp_last = NULL;
+ }
+ if (tcp->flags & TCB_ATTACHED)
+ detach(tcp, 0);
+ else {
+ kill(tcp->pid, SIGCONT);
+ kill(tcp->pid, SIGTERM);
+ }
+ }
+ if (cflag)
+ call_summary(outf);
+}
+
+static void
+interrupt(sig)
+int sig;
+{
+ interrupted = 1;
+}
+
+#ifndef HAVE_STRERROR
+
+#ifndef SYS_ERRLIST_DECLARED
+extern int sys_nerr;
+extern char *sys_errlist[];
+#endif /* SYS_ERRLIST_DECLARED */
+
+const char *
+strerror(errno)
+int errno;
+{
+ static char buf[64];
+
+ if (errno < 1 || errno >= sys_nerr) {
+ sprintf(buf, "Unknown error %d", errno);
+ return buf;
+ }
+ return sys_errlist[errno];
+}
+
+#endif /* HAVE_STERRROR */
+
+#ifndef HAVE_STRSIGNAL
+
+#ifndef SYS_SIGLIST_DECLARED
+#ifdef HAVE__SYS_SIGLIST
+ extern char *_sys_siglist[];
+#else
+ extern char *sys_siglist[];
+#endif
+#endif /* SYS_SIGLIST_DECLARED */
+
+const char *
+strsignal(sig)
+int sig;
+{
+ static char buf[64];
+
+ if (sig < 1 || sig >= NSIG) {
+ sprintf(buf, "Unknown signal %d", sig);
+ return buf;
+ }
+#ifdef HAVE__SYS_SIGLIST
+ return _sys_siglist[sig];
+#else
+ return sys_siglist[sig];
+#endif
+}
+
+#endif /* HAVE_STRSIGNAL */
+
+#ifdef SVR4
+
+static void
+rebuild_pollv()
+{
+ int i, j;
+ struct tcb *tcp;
+
+ for (i = j = 0, tcp = tcbtab; i < MAX_PROCS; i++, tcp++) {
+ if (!(tcp->flags & TCB_INUSE))
+ continue;
+ pollv[j].fd = tcp->pfd;
+ pollv[j].events = POLLPRI;
+ j++;
+ }
+ if (j != nprocs) {
+ fprintf(stderr, "strace: proc miscount\n");
+ exit(1);
+ }
+}
+
+#ifndef HAVE_POLLABLE_PROCFS
+
+static void
+proc_poll_open()
+{
+ int arg;
+ int i;
+
+ if (pipe(proc_poll_pipe) < 0) {
+ perror("pipe");
+ exit(1);
+ }
+ for (i = 0; i < 2; i++) {
+ if ((arg = fcntl(proc_poll_pipe[i], F_GETFD)) < 0) {
+ perror("F_GETFD");
+ exit(1);
+ }
+ if (fcntl(proc_poll_pipe[i], F_SETFD, arg|FD_CLOEXEC) < 0) {
+ perror("F_SETFD");
+ exit(1);
+ }
+ }
+}
+
+static int
+proc_poll(pollv, nfds, timeout)
+struct pollfd *pollv;
+int nfds;
+int timeout;
+{
+ int i;
+ int n;
+ struct proc_pollfd pollinfo;
+
+ if ((n = read(proc_poll_pipe[0], &pollinfo, sizeof(pollinfo))) < 0)
+ return n;
+ if (n != sizeof(struct proc_pollfd)) {
+ fprintf(stderr, "panic: short read: %d\n", n);
+ exit(1);
+ }
+ for (i = 0; i < nprocs; i++) {
+ if (pollv[i].fd == pollinfo.fd)
+ pollv[i].revents = pollinfo.revents;
+ else
+ pollv[i].revents = 0;
+ }
+ poller_pid = pollinfo.pid;
+ return 1;
+}
+
+static void
+wakeup_handler(sig)
+int sig;
+{
+}
+
+static void
+proc_poller(pfd)
+int pfd;
+{
+ struct proc_pollfd pollinfo;
+ struct sigaction sa;
+ sigset_t blocked_set, empty_set;
+ int i;
+ int n;
+ struct rlimit rl;
+
+ switch (fork()) {
+ case -1:
+ perror("fork");
+ _exit(0);
+ case 0:
+ break;
+ default:
+ return;
+ }
+
+ sa.sa_handler = interactive ? SIG_DFL : SIG_IGN;
+ sa.sa_flags = 0;
+ sigemptyset(&sa.sa_mask);
+ sigaction(SIGHUP, &sa, NULL);
+ sigaction(SIGINT, &sa, NULL);
+ sigaction(SIGQUIT, &sa, NULL);
+ sigaction(SIGPIPE, &sa, NULL);
+ sigaction(SIGTERM, &sa, NULL);
+ sa.sa_handler = wakeup_handler;
+ sigaction(SIGUSR1, &sa, NULL);
+ sigemptyset(&blocked_set);
+ sigaddset(&blocked_set, SIGUSR1);
+ sigprocmask(SIG_BLOCK, &blocked_set, NULL);
+ sigemptyset(&empty_set);
+
+ if (getrlimit(RLIMIT_NOFILE, &rl) < 0) {
+ perror("getrlimit(RLIMIT_NOFILE, ...)");
+ _exit(0);
+ }
+ n = rl.rlim_cur;
+ for (i = 0; i < n; i++) {
+ if (i != pfd && i != proc_poll_pipe[1])
+ close(i);
+ }
+
+ pollinfo.fd = pfd;
+ pollinfo.pid = getpid();
+ for (;;) {
+ if (ioctl(pfd, PIOCWSTOP, NULL) < 0) {
+ switch (errno) {
+ case EINTR:
+ continue;
+ case EBADF:
+ pollinfo.revents = POLLERR;
+ break;
+ case ENOENT:
+ pollinfo.revents = POLLHUP;
+ break;
+ default:
+ perror("proc_poller: PIOCWSTOP");
+ }
+ write(proc_poll_pipe[1], &pollinfo, sizeof(pollinfo));
+ _exit(0);
+ }
+ pollinfo.revents = POLLPRI;
+ write(proc_poll_pipe[1], &pollinfo, sizeof(pollinfo));
+ sigsuspend(&empty_set);
+ }
+}
+
+#endif /* !HAVE_POLLABLE_PROCFS */
+
+static int
+choose_pfd()
+{
+ int i, j;
+ struct tcb *tcp;
+
+ static int last;
+
+ if (followfork < 2 &&
+ last < nprocs && (pollv[last].revents & POLLPRI)) {
+ /*
+ * The previous process is ready to run again. We'll
+ * let it do so if it is currently in a syscall. This
+ * heuristic improves the readability of the trace.
+ */
+ tcp = pfd2tcb(pollv[last].fd);
+ if (tcp && (tcp->flags & TCB_INSYSCALL))
+ return pollv[last].fd;
+ }
+
+ for (i = 0; i < nprocs; i++) {
+ /* Let competing children run round robin. */
+ j = (i + last + 1) % nprocs;
+ if (pollv[j].revents & (POLLHUP | POLLERR)) {
+ tcp = pfd2tcb(pollv[j].fd);
+ if (!tcp) {
+ fprintf(stderr, "strace: lost proc\n");
+ exit(1);
+ }
+ droptcb(tcp);
+ return -1;
+ }
+ if (pollv[j].revents & POLLPRI) {
+ last = j;
+ return pollv[j].fd;
+ }
+ }
+ fprintf(stderr, "strace: nothing ready\n");
+ exit(1);
+}
+
+static int
+trace()
+{
+ struct tcb *tcp;
+ int pfd;
+ int what;
+ int ioctl_result = 0, ioctl_errno = 0;
+
+ for (;;) {
+ if (interactive)
+ sigprocmask(SIG_SETMASK, &empty_set, NULL);
+
+ if (nprocs == 0)
+ break;
+
+ switch (nprocs) {
+ case 1:
+#ifndef HAVE_POLLABLE_PROCFS
+ if (proc_poll_pipe[0] == -1) {
+#endif
+ tcp = pid2tcb(0);
+ if (!tcp)
+ continue;
+ pfd = tcp->pfd;
+ if (pfd == -1)
+ continue;
+ break;
+#ifndef HAVE_POLLABLE_PROCFS
+ }
+ /* fall through ... */
+#endif /* !HAVE_POLLABLE_PROCFS */
+ default:
+#ifdef HAVE_POLLABLE_PROCFS
+ if (poll(pollv, nprocs, INFTIM) < 0) {
+ if (interrupted)
+ return 0;
+ continue;
+ }
+#else /* !HAVE_POLLABLE_PROCFS */
+ if (proc_poll(pollv, nprocs, INFTIM) < 0) {
+ if (interrupted)
+ return 0;
+ continue;
+ }
+#endif /* !HAVE_POLLABLE_PROCFS */
+ pfd = choose_pfd();
+ if (pfd == -1)
+ continue;
+ break;
+ }
+
+ /* Look up `pfd' in our table. */
+ if ((tcp = pfd2tcb(pfd)) == NULL) {
+ fprintf(stderr, "unknown pfd: %u\n", pfd);
+ exit(1);
+ }
+ /* Get the status of the process. */
+ if (!interrupted) {
+ ioctl_result = ioctl(tcp->pfd, PIOCWSTOP,
+ &tcp->status);
+ ioctl_errno = errno;
+#ifndef HAVE_POLLABLE_PROCFS
+ if (proc_poll_pipe[0] != -1) {
+ if (ioctl_result < 0)
+ kill(poller_pid, SIGKILL);
+ else
+ kill(poller_pid, SIGUSR1);
+ }
+#endif /* !HAVE_POLLABLE_PROCFS */
+ }
+ if (interrupted)
+ return 0;
+
+ if (interactive)
+ sigprocmask(SIG_BLOCK, &blocked_set, NULL);
+
+ if (ioctl_result < 0) {
+ /* Find out what happened if it failed. */
+ switch (ioctl_errno) {
+ case EINTR:
+ case EBADF:
+ continue;
+ case ENOENT:
+ droptcb(tcp);
+ continue;
+ default:
+ perror("PIOCWSTOP");
+ exit(1);
+ }
+ }
+
+ /* clear the just started flag */
+ tcp->flags &= ~TCB_STARTUP;
+
+ /* set current output file */
+ outf = tcp->outf;
+
+ if (cflag) {
+ struct timeval stime;
+
+ stime.tv_sec = tcp->status.pr_stime.tv_sec;
+ stime.tv_usec = tcp->status.pr_stime.tv_nsec/1000;
+ tv_sub(&tcp->dtime, &stime, &tcp->stime);
+ tcp->stime = stime;
+ }
+
+ what = tcp->status.pr_what;
+ switch (tcp->status.pr_why) {
+ case PR_REQUESTED:
+ if (tcp->status.pr_flags & PR_ASLEEP) {
+ tcp->status.pr_why = PR_SYSENTRY;
+ if (trace_syscall(tcp) < 0) {
+ fprintf(stderr, "syscall trouble\n");
+ exit(1);
+ }
+ }
+ break;
+ case PR_SYSENTRY:
+ case PR_SYSEXIT:
+ if (trace_syscall(tcp) < 0) {
+ fprintf(stderr, "syscall trouble\n");
+ exit(1);
+ }
+ break;
+ case PR_SIGNALLED:
+ if (!cflag && (qual_flags[what] & QUAL_SIGNAL)) {
+ printleader(tcp);
+ tprintf("--- %s (%s) ---",
+ signalent[what], strsignal(what));
+ printtrailer(tcp);
+ }
+ break;
+ case PR_FAULTED:
+ if (!cflag && (qual_flags[what] & QUAL_FAULT)) {
+ printleader(tcp);
+ tprintf("=== FAULT %d ===", what);
+ printtrailer(tcp);
+ }
+ break;
+ default:
+ fprintf(stderr, "odd stop %d\n", tcp->status.pr_why);
+ exit(1);
+ break;
+ }
+ if (ioctl(tcp->pfd, PIOCRUN, NULL) < 0) {
+ perror("PIOCRUN");
+ exit(1);
+ }
+ }
+ return 0;
+}
+
+#else /* !SVR4 */
+
+static int
+trace()
+{
+ int pid;
+ int wait_errno;
+ int status;
+ struct tcb *tcp;
+#ifdef LINUX
+ struct rusage ru;
+#endif /* LINUX */
+
+ while (nprocs != 0) {
+ if (interactive)
+ sigprocmask(SIG_SETMASK, &empty_set, NULL);
+#ifdef LINUX
+ pid = wait4(-1, &status, 0, cflag ? &ru : NULL);
+#endif /* LINUX */
+#ifdef SUNOS4
+ pid = wait(&status);
+#endif /* SUNOS4 */
+ wait_errno = errno;
+ if (interactive)
+ sigprocmask(SIG_BLOCK, &blocked_set, NULL);
+
+ if (interrupted)
+ return 0;
+
+ if (pid == -1) {
+ switch (wait_errno) {
+ case EINTR:
+ continue;
+ case ECHILD:
+ /*
+ * We would like to verify this case
+ * but sometimes a race in Solbourne's
+ * version of SunOS sometimes reports
+ * ECHILD before sending us SIGCHILD.
+ */
+#if 0
+ if (nprocs == 0)
+ return 0;
+ fprintf(stderr, "strace: proc miscount\n");
+ exit(1);
+#endif
+ return 0;
+ default:
+ errno = wait_errno;
+ perror("strace: wait");
+ return -1;
+ }
+ }
+ if (debug)
+ fprintf(stderr, " [wait(%#x) = %u]\n", status, pid);
+
+ /* Look up `pid' in our table. */
+ if ((tcp = pid2tcb(pid)) == NULL) {
+ fprintf(stderr, "unknown pid: %u\n", pid);
+ if (WIFSTOPPED(status))
+ ptrace(PTRACE_CONT, pid, (char *) 1, 0);
+ exit(1);
+ }
+ /* set current output file */
+ outf = tcp->outf;
+ if (cflag) {
+#ifdef LINUX
+ tv_sub(&tcp->dtime, &ru.ru_stime, &tcp->stime);
+ tcp->stime = ru.ru_stime;
+#endif /* !LINUX */
+ }
+
+ if (tcp->flags & TCB_SUSPENDED) {
+ /*
+ * Apparently, doing any ptrace() call on a stopped
+ * process, provokes the kernel to report the process
+ * status again on a subsequent wait(), even if the
+ * process has not been actually restarted.
+ * Since we have inspected the arguments of suspended
+ * processes we end up here testing for this case.
+ */
+ continue;
+ }
+ if (WIFSIGNALED(status)) {
+ if (!cflag
+ && (qual_flags[WTERMSIG(status)] & QUAL_SIGNAL)) {
+ printleader(tcp);
+ tprintf("+++ killed by %s +++",
+ signalent[WTERMSIG(status)]);
+ printtrailer(tcp);
+ }
+ droptcb(tcp);
+ continue;
+ }
+ if (WIFEXITED(status)) {
+ if (debug)
+ fprintf(stderr, "pid %u exited\n", pid);
+ if (tcp->flags & TCB_ATTACHED)
+ fprintf(stderr,
+ "PANIC: attached pid %u exited\n",
+ pid);
+ droptcb(tcp);
+ continue;
+ }
+ if (!WIFSTOPPED(status)) {
+ fprintf(stderr, "PANIC: pid %u not stopped\n", pid);
+ droptcb(tcp);
+ continue;
+ }
+ if (debug)
+ fprintf(stderr, "pid %u stopped, [%s]\n",
+ pid, signalent[WSTOPSIG(status)]);
+
+ if (tcp->flags & TCB_STARTUP) {
+ /*
+ * This flag is there to keep us in sync.
+ * Next time this process stops it should
+ * really be entering a system call.
+ */
+ tcp->flags &= ~TCB_STARTUP;
+ if (tcp->flags & TCB_ATTACHED) {
+ /*
+ * Interestingly, the process may stop
+ * with STOPSIG equal to some other signal
+ * than SIGSTOP if we happend to attach
+ * just before the process takes a signal.
+ */
+ if (!WIFSTOPPED(status)) {
+ fprintf(stderr,
+ "pid %u not stopped\n", pid);
+ detach(tcp, WSTOPSIG(status));
+ continue;
+ }
+ }
+ else {
+#ifdef SUNOS4
+ /* A child of us stopped at exec */
+ if (WSTOPSIG(status) == SIGTRAP && followvfork)
+ fixvfork(tcp);
+#endif /* SUNOS4 */
+ }
+ if (tcp->flags & TCB_BPTSET) {
+ if (clearbpt(tcp) < 0) /* Pretty fatal */ {
+ droptcb(tcp);
+ cleanup();
+ return -1;
+ }
+ }
+ goto tracing;
+ }
+
+ if (WSTOPSIG(status) != SIGTRAP) {
+ if (WSTOPSIG(status) == SIGSTOP &&
+ (tcp->flags & TCB_SIGTRAPPED)) {
+ /*
+ * Trapped attempt to block SIGTRAP
+ * Hope we are back in control now.
+ */
+ tcp->flags &= ~(TCB_INSYSCALL | TCB_SIGTRAPPED);
+ if (ptrace(PTRACE_SYSCALL,
+ pid, (char *) 1, 0) < 0) {
+ perror("trace: ptrace(PTRACE_SYSCALL, ...)");
+ cleanup();
+ return -1;
+ }
+ continue;
+ }
+ if (!cflag
+ && (qual_flags[WSTOPSIG(status)] & QUAL_SIGNAL)) {
+ printleader(tcp);
+ tprintf("--- %s (%s) ---",
+ signalent[WSTOPSIG(status)],
+ strsignal(WSTOPSIG(status)));
+ printtrailer(tcp);
+ }
+ if ((tcp->flags & TCB_ATTACHED) &&
+ !sigishandled(tcp, WSTOPSIG(status))) {
+ detach(tcp, WSTOPSIG(status));
+ continue;
+ }
+ if (ptrace(PTRACE_SYSCALL, pid, (char *) 1,
+ WSTOPSIG(status)) < 0) {
+ perror("trace: ptrace(PTRACE_SYSCALL, ...)");
+ cleanup();
+ return -1;
+ }
+ tcp->flags &= ~TCB_SUSPENDED;
+ continue;
+ }
+ if (trace_syscall(tcp) < 0) {
+ if (tcp->flags & TCB_ATTACHED)
+ detach(tcp, 0);
+ else {
+ ptrace(PTRACE_KILL,
+ tcp->pid, (char *) 1, SIGTERM);
+ droptcb(tcp);
+ }
+ continue;
+ }
+ if (tcp->flags & TCB_EXITING) {
+ if (tcp->flags & TCB_ATTACHED)
+ detach(tcp, 0);
+ else if (ptrace(PTRACE_CONT, pid, (char *) 1, 0) < 0) {
+ perror("strace: ptrace(PTRACE_CONT, ...)");
+ cleanup();
+ return -1;
+ }
+ continue;
+ }
+ if (tcp->flags & TCB_SUSPENDED) {
+ if (!qflag)
+ fprintf(stderr, "Process %u suspended\n", pid);
+ continue;
+ }
+ tracing:
+ if (ptrace(PTRACE_SYSCALL, pid, (char *) 1, 0) < 0) {
+ perror("trace: ptrace(PTRACE_SYSCALL, ...)");
+ cleanup();
+ return -1;
+ }
+ }
+ return 0;
+}
+
+#endif /* !SVR4 */
+
+static int curcol;
+
+#ifdef __STDC__
+#include <stdarg.h>
+#define VA_START(a, b) va_start(a, b)
+#else
+#include <varargs.h>
+#define VA_START(a, b) va_start(a)
+#endif
+
+void
+#ifdef __STDC__
+tprintf(const char *fmt, ...)
+#else
+tprintf(fmt, va_alist)
+char *fmt;
+va_dcl
+#endif
+{
+ va_list args;
+
+ VA_START(args, fmt);
+ if (outf)
+ curcol += vfprintf(outf, fmt, args);
+ va_end(args);
+ return;
+}
+
+void
+printleader(tcp)
+struct tcb *tcp;
+{
+ if (tcp_last && (!outfname || followfork < 2 || tcp_last == tcp)) {
+ tcp_last->flags |= TCB_REPRINT;
+ tprintf(" <unfinished ...>\n");
+ }
+ curcol = 0;
+ if ((followfork == 1 || pflag_seen > 1) && outfname)
+ tprintf("%-5d ", tcp->pid);
+ else if (nprocs > 1 && !outfname)
+ tprintf("[pid %5u] ", tcp->pid);
+ if (tflag) {
+ char str[sizeof("HH:MM:SS")];
+ struct timeval tv, dtv;
+ static struct timeval otv;
+
+ gettimeofday(&tv, NULL);
+ if (rflag) {
+ if (otv.tv_sec == 0)
+ otv = tv;
+ tv_sub(&dtv, &tv, &otv);
+ tprintf("%6ld.%06ld ",
+ (long) dtv.tv_sec, (long) dtv.tv_usec);
+ otv = tv;
+ }
+ else if (tflag > 2) {
+ tprintf("%ld.%06ld ",
+ (long) tv.tv_sec, (long) tv.tv_usec);
+ }
+ else {
+ time_t local = tv.tv_sec;
+ strftime(str, sizeof(str), "%T", localtime(&local));
+ if (tflag > 1)
+ tprintf("%s.%06ld ", str, (long) tv.tv_usec);
+ else
+ tprintf("%s ", str);
+ }
+ }
+ if (iflag)
+ printcall(tcp);
+}
+
+void
+tabto(col)
+int col;
+{
+ if (curcol < col)
+ tprintf("%*s", col - curcol, "");
+}
+
+void
+printtrailer(tcp)
+struct tcb *tcp;
+{
+ tprintf("\n");
+ tcp_last = NULL;
+}