| /*--------------------------------------------------------------------*/ |
| /*--- Relay between gdb and gdbserver embedded in valgrind vgdb.c ---*/ |
| /*--------------------------------------------------------------------*/ |
| |
| /* |
| This file is part of Valgrind, a dynamic binary instrumentation |
| framework. |
| |
| Copyright (C) 2011-2013 Philippe Waroquiers |
| |
| This program is free software; you can redistribute it and/or |
| modify it under the terms of the GNU General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307, USA. |
| |
| The GNU General Public License is contained in the file COPYING. |
| */ |
| |
| #include "vgdb.h" |
| |
| #include "config.h" |
| |
| #include <assert.h> |
| #include <dirent.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <limits.h> |
| #include <poll.h> |
| #include <pthread.h> |
| #include <signal.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <netinet/in.h> |
| #include <sys/mman.h> |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/time.h> |
| |
| /* vgdb has two usages: |
| 1. relay application between gdb and the gdbserver embedded in valgrind. |
| 2. standalone to send monitor commands to a running valgrind-ified process |
| |
| It is made of a main program which reads arguments. If no |
| arguments are given or only --pid and --vgdb-prefix, then usage 1 is |
| assumed. |
| |
| As relay application, vgdb reads bytes from gdb on stdin and |
| writes these bytes to valgrind. Bytes read from valgrind are |
| written to gdb on stdout. Read/Write from/to valgrind is done |
| using FIFOs. There is one thread reading from stdin, writing to |
| valgrind on a FIFO. There is one thread reading from valgrind on a |
| FIFO, writing to gdb on stdout |
| |
| As a standalone utility, vgdb builds command packets to write to valgrind, |
| sends it and reads the reply. The same two threads are used to write/read. |
| Once all the commands are sent and their replies received, vgdb will exit. |
| */ |
| |
| int debuglevel; |
| struct timeval dbgtv; |
| static char *vgdb_prefix = NULL; |
| |
| /* Will be set to True when any condition indicating we have to shutdown |
| is encountered. */ |
| Bool shutting_down = False; |
| |
| VgdbShared32 *shared32; |
| VgdbShared64 *shared64; |
| #define VS_written_by_vgdb (shared32 != NULL ? \ |
| shared32->written_by_vgdb \ |
| : shared64->written_by_vgdb) |
| #define VS_seen_by_valgrind (shared32 != NULL ? \ |
| shared32->seen_by_valgrind \ |
| : shared64->seen_by_valgrind) |
| |
| #define VS_vgdb_pid (shared32 != NULL ? shared32->vgdb_pid : shared64->vgdb_pid) |
| |
| void *vmalloc(size_t size) |
| { |
| void * mem = malloc(size); |
| if (mem == NULL) |
| XERROR (errno, "can't allocate memory\n"); |
| return mem; |
| } |
| |
| void *vrealloc(void *ptr,size_t size) |
| { |
| void * mem = realloc(ptr, size); |
| if (mem == NULL) |
| XERROR (errno, "can't reallocate memory\n"); |
| return mem; |
| } |
| |
| /* Return the name of a directory for temporary files. */ |
| static |
| const char *vgdb_tmpdir(void) |
| { |
| const char *tmpdir; |
| |
| tmpdir = getenv("TMPDIR"); |
| if (tmpdir == NULL || *tmpdir == '\0') |
| tmpdir = VG_TMPDIR; |
| if (tmpdir == NULL || *tmpdir == '\0') |
| tmpdir = "/tmp"; /* fallback */ |
| |
| return tmpdir; |
| } |
| |
| /* Return the default path prefix for the named pipes (FIFOs) used by vgdb/gdb |
| to communicate with valgrind */ |
| static |
| char *vgdb_prefix_default(void) |
| { |
| static HChar *prefix; |
| |
| if (prefix == NULL) { |
| const char *tmpdir = vgdb_tmpdir(); |
| prefix = vmalloc(strlen(tmpdir) + strlen("/vgdb-pipe") + 1); |
| strcpy(prefix, tmpdir); |
| strcat(prefix, "/vgdb-pipe"); |
| } |
| return prefix; |
| } |
| |
| /* add nrw to the written_by_vgdb field of shared32 or shared64 */ |
| static |
| void add_written(int nrw) |
| { |
| if (shared32 != NULL) |
| shared32->written_by_vgdb += nrw; |
| else if (shared64 != NULL) |
| shared64->written_by_vgdb += nrw; |
| else |
| assert(0); |
| } |
| |
| static int shared_mem_fd = -1; |
| static |
| void map_vgdbshared (char* shared_mem) |
| { |
| struct stat fdstat; |
| void **s; |
| shared_mem_fd = open(shared_mem, O_RDWR); |
| /* shared_mem_fd will not be closed till vgdb exits. */ |
| |
| if (shared_mem_fd == -1) |
| XERROR (errno, "error opening %s shared memory file\n", shared_mem); |
| |
| if (fstat(shared_mem_fd, &fdstat) != 0) |
| XERROR (errno, "fstat"); |
| |
| if (fdstat.st_size == sizeof(VgdbShared64)) |
| s = (void*) &shared64; |
| else if (fdstat.st_size == sizeof(VgdbShared32)) |
| s = (void*) &shared32; |
| else |
| #if VEX_HOST_WORDSIZE == 8 |
| XERROR (0, |
| "error size shared memory file %s.\n" |
| "expecting size %d (64bits) or %d (32bits) got %ld.\n", |
| shared_mem, |
| (int) sizeof(VgdbShared64), (int) sizeof(VgdbShared32), |
| (long int)fdstat.st_size); |
| #elif VEX_HOST_WORDSIZE == 4 |
| XERROR (0, |
| "error size shared memory file %s.\n" |
| "expecting size %d (32bits) got %ld.\n", |
| shared_mem, |
| (int) sizeof(VgdbShared32), |
| fdstat.st_size); |
| #else |
| # error "unexpected wordsize" |
| #endif |
| |
| #if VEX_HOST_WORDSIZE == 4 |
| if (shared64 != NULL) |
| XERROR (0, "cannot use 32 bits vgdb with a 64bits valgrind process\n"); |
| /* But we can use a 64 bits vgdb with a 32 bits valgrind */ |
| #endif |
| |
| *s = (void*) mmap (NULL, fdstat.st_size, |
| PROT_READ|PROT_WRITE, MAP_SHARED, |
| shared_mem_fd, 0); |
| |
| if (*s == (void *) -1) |
| XERROR (errno, "error mmap shared memory file %s\n", shared_mem); |
| |
| } |
| |
| /* This function loops till shutting_down becomes true. In this loop, |
| it verifies if valgrind process is reading the characters written |
| by vgdb. The verification is done every max_invoke_ms ms. If |
| valgrind is not reading characters, it will use invoker_invoke_gdbserver |
| to ensure that the gdbserver code is called soon by valgrind. */ |
| static int max_invoke_ms = 100; |
| #define NEVER 99999999 |
| static int cmd_time_out = NEVER; |
| static |
| void *invoke_gdbserver_in_valgrind(void *v_pid) |
| { |
| struct timeval cmd_max_end_time; |
| Bool cmd_started = False; |
| struct timeval invoke_time; |
| |
| int pid = *(int *)v_pid; |
| int written_by_vgdb_before_sleep; |
| int seen_by_valgrind_before_sleep; |
| |
| int invoked_written = -1; |
| unsigned int usecs; |
| |
| pthread_cleanup_push(invoker_cleanup_restore_and_detach, v_pid); |
| |
| while (!shutting_down) { |
| written_by_vgdb_before_sleep = VS_written_by_vgdb; |
| seen_by_valgrind_before_sleep = VS_seen_by_valgrind; |
| DEBUG(3, |
| "written_by_vgdb_before_sleep %d " |
| "seen_by_valgrind_before_sleep %d\n", |
| written_by_vgdb_before_sleep, |
| seen_by_valgrind_before_sleep); |
| if (cmd_time_out != NEVER |
| && !cmd_started |
| && written_by_vgdb_before_sleep > seen_by_valgrind_before_sleep) { |
| /* A command was started. Record the time at which it was started. */ |
| DEBUG(1, "IO for command started\n"); |
| gettimeofday(&cmd_max_end_time, NULL); |
| cmd_max_end_time.tv_sec += cmd_time_out; |
| cmd_started = True; |
| } |
| if (max_invoke_ms > 0) { |
| usecs = 1000 * max_invoke_ms; |
| gettimeofday(&invoke_time, NULL); |
| invoke_time.tv_sec += max_invoke_ms / 1000; |
| invoke_time.tv_usec += 1000 * (max_invoke_ms % 1000); |
| invoke_time.tv_sec += invoke_time.tv_usec / (1000 * 1000); |
| invoke_time.tv_usec = invoke_time.tv_usec % (1000 * 1000); |
| } else { |
| usecs = 0; |
| } |
| if (cmd_started) { |
| // 0 usecs here means the thread just has to check gdbserver eats |
| // the characters in <= cmd_time_out seconds. |
| // We will just wait by 1 second max at a time. |
| if (usecs == 0 || usecs > 1000 * 1000) |
| usecs = 1000 * 1000; |
| } |
| usleep(usecs); |
| |
| /* If nothing happened during our sleep, let's try to wake up valgrind |
| or check for cmd time out. */ |
| if (written_by_vgdb_before_sleep == VS_written_by_vgdb |
| && seen_by_valgrind_before_sleep == VS_seen_by_valgrind |
| && VS_written_by_vgdb > VS_seen_by_valgrind) { |
| struct timeval now; |
| gettimeofday(&now, NULL); |
| DEBUG(2, |
| "after sleep " |
| "written_by_vgdb %d " |
| "seen_by_valgrind %d " |
| "invoked_written %d\n", |
| VS_written_by_vgdb, |
| VS_seen_by_valgrind, |
| invoked_written); |
| /* if the pid does not exist anymore, we better stop */ |
| if (kill(pid, 0) != 0) |
| XERROR (errno, |
| "invoke_gdbserver_in_valgrind: " |
| "check for pid %d existence failed\n", pid); |
| if (cmd_started) { |
| if (timercmp (&now, &cmd_max_end_time, >)) |
| XERROR (0, |
| "pid %d did not handle a command in %d seconds\n", |
| pid, cmd_time_out); |
| } |
| if (max_invoke_ms > 0 && timercmp (&now, &invoke_time, >=)) { |
| /* only need to wake up if the nr written has changed since |
| last invoke. */ |
| if (invoked_written != written_by_vgdb_before_sleep) { |
| if (invoker_invoke_gdbserver(pid)) { |
| /* If invoke succesful, no need to invoke again |
| for the same value of written_by_vgdb_before_sleep. */ |
| invoked_written = written_by_vgdb_before_sleep; |
| } |
| } |
| } |
| } else { |
| // Something happened => restart timer check. |
| if (cmd_time_out != NEVER) { |
| DEBUG(2, "some IO was done => restart command\n"); |
| cmd_started = False; |
| } |
| } |
| } |
| pthread_cleanup_pop(0); |
| return NULL; |
| } |
| |
| static |
| int open_fifo (const char* name, int flags, const char* desc) |
| { |
| int fd; |
| DEBUG(1, "opening %s %s\n", name, desc); |
| fd = open(name, flags); |
| if (fd == -1) |
| XERROR (errno, "error opening %s %s\n", name, desc); |
| |
| DEBUG(1, "opened %s %s fd %d\n", name, desc, fd); |
| return fd; |
| } |
| |
| /* acquire a lock on the first byte of the given fd. If not successful, |
| exits with error. |
| This allows to avoid having two vgdb speaking with the same Valgrind |
| gdbserver as this causes serious headaches to the protocol. */ |
| static |
| void acquire_lock (int fd, int valgrind_pid) |
| { |
| struct flock fl; |
| fl.l_type = F_WRLCK; |
| fl.l_whence = SEEK_SET; |
| fl.l_start = 0; |
| fl.l_len = 1; |
| if (fcntl(fd, F_SETLK, &fl) < 0) { |
| if (errno == EAGAIN || errno == EACCES) { |
| XERROR(errno, |
| "Cannot acquire lock.\n" |
| "Probably vgdb pid %d already speaks with Valgrind pid %d\n", |
| VS_vgdb_pid, |
| valgrind_pid); |
| } else { |
| XERROR(errno, "cannot acquire lock.\n"); |
| } |
| } |
| |
| /* Here, we have the lock. It will be released when fd will be closed. */ |
| /* We indicate our pid to Valgrind gdbserver */ |
| if (shared32 != NULL) |
| shared32->vgdb_pid = getpid(); |
| else if (shared64 != NULL) |
| shared64->vgdb_pid = getpid(); |
| else |
| assert(0); |
| } |
| |
| #define PBUFSIZ 16384 /* keep in sync with server.h */ |
| |
| /* read some characters from fd. |
| Returns the nr of characters read, -1 if error. |
| desc is a string used in tracing */ |
| static |
| int read_buf (int fd, char* buf, const char* desc) |
| { |
| int nrread; |
| DEBUG(2, "reading %s\n", desc); |
| nrread = read(fd, buf, PBUFSIZ); |
| if (nrread == -1) { |
| ERROR (errno, "error reading %s\n", desc); |
| return -1; |
| } |
| buf[nrread] = '\0'; |
| DEBUG(2, "read %s %s\n", desc, buf); |
| return nrread; |
| } |
| |
| /* write size bytes from buf to fd. |
| desc is a description of the action for which the write is done. |
| If notify, then add size to the shared cntr indicating to the |
| valgrind process that there is new data. |
| Returns True if write is ok, False if there was a problem. */ |
| static |
| Bool write_buf(int fd, char* buf, int size, const char* desc, Bool notify) |
| { |
| int nrwritten; |
| int nrw; |
| DEBUG(2, "writing %s len %d %.*s notify: %d\n", desc, size, |
| size, buf, notify); |
| nrwritten = 0; |
| while (nrwritten < size) { |
| nrw = write (fd, buf+nrwritten, size - nrwritten); |
| if (nrw == -1) { |
| ERROR(errno, "error write %s\n", desc); |
| return False; |
| } |
| nrwritten = nrwritten + nrw; |
| if (notify) |
| add_written(nrw); |
| } |
| return True; |
| } |
| |
| typedef enum { |
| FROM_GDB, |
| TO_GDB, |
| FROM_PID, |
| TO_PID } ConnectionKind; |
| static const int NumConnectionKind = TO_PID+1; |
| static |
| const char *ppConnectionKind (ConnectionKind con) |
| { |
| switch (con) { |
| case FROM_GDB: return "FROM_GDB"; |
| case TO_GDB: return "TO_GDB"; |
| case FROM_PID: return "FROM_PID"; |
| case TO_PID: return "TO_PID"; |
| default: return "invalid connection kind"; |
| } |
| } |
| |
| static char *shared_mem; |
| |
| static int from_gdb = 0; /* stdin by default, changed if --port is given. */ |
| static char *from_gdb_to_pid; /* fifo name to write gdb command to pid */ |
| /* Returns True in case read/write operations were done properly. |
| Returns False in case of error. |
| to_pid is the file descriptor to write to the process pid. */ |
| static |
| Bool read_from_gdb_write_to_pid(int to_pid) |
| { |
| char buf[PBUFSIZ+1]; // +1 for trailing \0 |
| int nrread; |
| |
| nrread = read_buf(from_gdb, buf, "from gdb on stdin"); |
| if (nrread <= 0) { |
| if (nrread == 0) |
| DEBUG(1, "read 0 bytes from gdb => assume exit\n"); |
| else |
| DEBUG(1, "error reading bytes from gdb\n"); |
| close (from_gdb); |
| shutting_down = True; |
| return False; |
| } |
| return write_buf(to_pid, buf, nrread, "to_pid", /* notify */ True); |
| } |
| |
| static int to_gdb = 1; /* stdout by default, changed if --port is given. */ |
| static char *to_gdb_from_pid; /* fifo name to read pid replies */ |
| /* Returns True in case read/write operations were done properly. |
| Returns False in case of error. |
| from_pid is the file descriptor to read data from the process pid. */ |
| static |
| Bool read_from_pid_write_to_gdb(int from_pid) |
| { |
| char buf[PBUFSIZ+1]; // +1 for trailing \0 |
| int nrread; |
| |
| nrread = read_buf(from_pid, buf, "from pid"); |
| if (nrread <= 0) { |
| if (nrread == 0) |
| DEBUG(1, "read 0 bytes from pid => assume exit\n"); |
| else |
| DEBUG(1, "error reading bytes from pid\n"); |
| close (from_pid); |
| shutting_down = True; |
| return False; |
| } |
| return write_buf(to_gdb, buf, nrread, "to_gdb", /* notify */ False); |
| } |
| |
| static |
| void wait_for_gdb_connect (int in_port) |
| { |
| struct sockaddr_in addr; |
| |
| int listen_gdb = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); |
| int gdb_connect; |
| |
| if (-1 == listen_gdb) { |
| XERROR(errno, "cannot create socket"); |
| } |
| |
| memset(&addr, 0, sizeof(addr)); |
| |
| addr.sin_family = AF_INET; |
| addr.sin_port = htons((unsigned short int)in_port); |
| addr.sin_addr.s_addr = INADDR_ANY; |
| |
| if (-1 == bind(listen_gdb,(struct sockaddr *)&addr, sizeof(addr))) { |
| XERROR(errno, "bind failed"); |
| } |
| fprintf(stderr, "listening on port %d ...", in_port); |
| fflush(stderr); |
| if (-1 == listen(listen_gdb, 1)) { |
| XERROR(errno, "error listen failed"); |
| } |
| |
| gdb_connect = accept(listen_gdb, NULL, NULL); |
| if (gdb_connect < 0) { |
| XERROR(errno, "accept failed"); |
| } |
| fprintf(stderr, "connected.\n"); |
| fflush(stderr); |
| close(listen_gdb); |
| from_gdb = gdb_connect; |
| to_gdb = gdb_connect; |
| } |
| |
| /* prepares the FIFOs filenames, map the shared memory. */ |
| static |
| void prepare_fifos_and_shared_mem(int pid) |
| { |
| const HChar *user, *host; |
| unsigned len; |
| |
| user = getenv("LOGNAME"); |
| if (user == NULL) user = getenv("USER"); |
| if (user == NULL) user = "???"; |
| if (strchr(user, '/')) user = "???"; |
| |
| host = getenv("HOST"); |
| if (host == NULL) host = getenv("HOSTNAME"); |
| if (host == NULL) host = "???"; |
| if (strchr(host, '/')) host = "???"; |
| |
| len = strlen(vgdb_prefix) + strlen(user) + strlen(host) + 40; |
| from_gdb_to_pid = vmalloc (len); |
| to_gdb_from_pid = vmalloc (len); |
| shared_mem = vmalloc (len); |
| /* below 3 lines must match the equivalent in remote-utils.c */ |
| sprintf(from_gdb_to_pid, "%s-from-vgdb-to-%d-by-%s-on-%s", vgdb_prefix, |
| pid, user, host); |
| sprintf(to_gdb_from_pid, "%s-to-vgdb-from-%d-by-%s-on-%s", vgdb_prefix, |
| pid, user, host); |
| sprintf(shared_mem, "%s-shared-mem-vgdb-%d-by-%s-on-%s", vgdb_prefix, |
| pid, user, host); |
| DEBUG (1, "vgdb: using %s %s %s\n", |
| from_gdb_to_pid, to_gdb_from_pid, shared_mem); |
| |
| map_vgdbshared(shared_mem); |
| } |
| |
| /* Convert hex digit A to a number. */ |
| |
| static int |
| fromhex (int a) |
| { |
| if (a >= '0' && a <= '9') |
| return a - '0'; |
| else if (a >= 'a' && a <= 'f') |
| return a - 'a' + 10; |
| else |
| XERROR(0, "Reply contains invalid hex digit %c\n", a); |
| return 0; |
| } |
| |
| /* Returns next char from fd. -1 if error, -2 if EOF. |
| NB: must always call it with the same fd */ |
| static int |
| readchar (int fd) |
| { |
| static char buf[PBUFSIZ+1]; // +1 for trailing \0 |
| static int bufcnt = 0; |
| static unsigned char *bufp; |
| // unsigned bufp to e.g. avoid having 255 converted to int -1 |
| |
| if (bufcnt-- > 0) |
| return *bufp++; |
| |
| bufcnt = read_buf (fd, buf, "static buf readchar"); |
| |
| if (bufcnt <= 0) { |
| if (bufcnt == 0) { |
| fprintf (stderr, "readchar: Got EOF\n"); |
| return -2; |
| } else { |
| ERROR (errno, "readchar\n"); |
| return -1; |
| } |
| } |
| |
| bufp = (unsigned char *)buf; |
| bufcnt--; |
| return *bufp++; |
| } |
| |
| /* Read a packet from fromfd, with error checking, |
| and store it in BUF. |
| Returns length of packet, or -1 if error or -2 if EOF. |
| Writes ack on ackfd */ |
| |
| static int |
| getpkt (char *buf, int fromfd, int ackfd) |
| { |
| char *bp; |
| unsigned char csum, c1, c2; |
| int c; |
| |
| while (1) { |
| csum = 0; |
| |
| while (1) { |
| c = readchar (fromfd); |
| if (c == '$') |
| break; |
| DEBUG(2, "[getpkt: discarding char '%c']\n", c); |
| if (c < 0) |
| return c; |
| } |
| |
| bp = buf; |
| while (1) { |
| c = readchar (fromfd); |
| if (c < 0) |
| return c; |
| if (c == '#') |
| break; |
| if (c == '*') { |
| int repeat; |
| int r; |
| int prev; |
| prev = *(bp-1); |
| csum += c; |
| repeat = readchar (fromfd); |
| csum += repeat; |
| for (r = 0; r < repeat - 29; r ++) |
| *bp++ = prev; |
| } else { |
| *bp++ = c; |
| csum += c; |
| } |
| } |
| *bp = 0; |
| |
| c1 = fromhex (readchar (fromfd)); |
| c2 = fromhex (readchar (fromfd)); |
| |
| if (csum == (c1 << 4) + c2) |
| break; |
| |
| fprintf (stderr, "Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n", |
| (c1 << 4) + c2, csum, buf); |
| if (write (ackfd, "-", 1) != 1) |
| ERROR(0, "error when writing - (nack)\n"); |
| else |
| add_written(1); |
| } |
| |
| DEBUG(2, "getpkt (\"%s\"); [sending ack] \n", buf); |
| if (write (ackfd, "+", 1) != 1) |
| ERROR(0, "error when writing + (ack)\n"); |
| else |
| add_written(1); |
| return bp - buf; |
| } |
| |
| static int sigint = 0; |
| static int sigterm = 0; |
| static int sigpipe = 0; |
| static int sighup = 0; |
| static int sigusr1 = 0; |
| static int sigalrm = 0; |
| static int sigusr1_fd = -1; |
| static pthread_t invoke_gdbserver_in_valgrind_thread; |
| |
| static |
| void received_signal (int signum) |
| { |
| if (signum == SIGINT) |
| sigint++; |
| else if (signum == SIGUSR1) { |
| sigusr1++; |
| if (sigusr1_fd >= 0) { |
| char control_c = '\003'; |
| write_buf(sigusr1_fd, &control_c, 1, |
| "write \\003 on SIGUSR1", /* notify */ True); |
| } |
| } |
| else if (signum == SIGTERM) { |
| shutting_down = True; |
| sigterm++; |
| } else if (signum == SIGHUP) { |
| shutting_down = True; |
| sighup++; |
| } else if (signum == SIGPIPE) { |
| sigpipe++; |
| } else if (signum == SIGALRM) { |
| sigalrm++; |
| #if defined(VGPV_arm_linux_android) \ |
| || defined(VGPV_x86_linux_android) \ |
| || defined(VGPV_mips32_linux_android) \ |
| || defined(VGPV_arm64_linux_android) |
| /* Android has no pthread_cancel. As it also does not have |
| an invoker implementation, there is no need for cleanup action. |
| So, we just do nothing. */ |
| DEBUG(1, "sigalrm received, no action on android\n"); |
| #else |
| /* Note: we cannot directly invoke restore_and_detach : this must |
| be done by the thread that has attached. |
| We have in this thread pushed a cleanup handler that will |
| cleanup what is needed. */ |
| DEBUG(1, "pthread_cancel invoke_gdbserver_in_valgrind_thread\n"); |
| pthread_cancel(invoke_gdbserver_in_valgrind_thread); |
| #endif |
| } else { |
| ERROR(0, "unexpected signal %d\n", signum); |
| } |
| } |
| |
| /* install the signal handlers allowing e.g. vgdb to cleanup in |
| case of termination. */ |
| static |
| void install_handlers(void) |
| { |
| struct sigaction action, oldaction; |
| |
| action.sa_handler = received_signal; |
| sigemptyset (&action.sa_mask); |
| action.sa_flags = 0; |
| |
| /* SIGINT: when user types C-c in gdb, this sends |
| a SIGINT to vgdb + causes a character to be sent to remote gdbserver. |
| The later is enough to wakeup the valgrind process. */ |
| if (sigaction (SIGINT, &action, &oldaction) != 0) |
| XERROR (errno, "vgdb error sigaction SIGINT\n"); |
| /* We might do something more intelligent than just |
| reporting this SIGINT E.g. behave similarly to the gdb: two |
| control-C without feedback from the debugged process would |
| mean to stop debugging it. */ |
| |
| /* SIGUSR1: this is used to facilitate automatic testing. When |
| vgdb receives this signal, it will simulate the user typing C-c. */ |
| if (sigaction (SIGUSR1, &action, &oldaction) != 0) |
| XERROR (errno, "vgdb error sigaction SIGUSR1\n"); |
| |
| |
| /* SIGTERM: can receive this signal (e.g. from gdb) to terminate vgdb |
| when detaching or similar. A clean shutdown will be done as both |
| the read and write side will detect an end of file. */ |
| if (sigaction (SIGTERM, &action, &oldaction) != 0) |
| XERROR (errno, "vgdb error sigaction SIGTERM\n"); |
| |
| /* SIGPIPE: can receive this signal when gdb detaches or kill the |
| process debugged: gdb will close its pipes to vgdb. vgdb |
| must resist to this signal to allow a clean shutdown. */ |
| if (sigaction (SIGPIPE, &action, &oldaction) != 0) |
| XERROR (errno, "vgdb error sigaction SIGPIPE\n"); |
| |
| /* SIGALRM: in case invoke thread is blocked, alarm is used |
| to cleanup. */ |
| if (sigaction (SIGALRM, &action, &oldaction) != 0) |
| XERROR (errno, "vgdb error sigaction SIGALRM\n"); |
| |
| /* unmask all signals, in case the process that launched vgdb |
| masked some. */ |
| if (sigprocmask (SIG_SETMASK, &action.sa_mask, NULL) != 0) |
| XERROR (errno, "vgdb error sigprocmask"); |
| } |
| |
| /* close the FIFOs provided connections, terminate the invoker thread. */ |
| static |
| void close_connection(int to_pid, int from_pid) |
| { |
| DEBUG(1, "nr received signals: sigint %d sigterm %d sighup %d sigpipe %d\n", |
| sigint, sigterm, sighup, sigpipe); |
| /* Note that we do not forward sigterm to the valgrind process: |
| a sigterm signal is (probably) received from gdb if the user wants to |
| kill the debugged process. The kill instruction has been given to |
| the valgrind process, which should execute a clean exit. */ |
| |
| /* We first close the connection to pid. The pid will then |
| terminates its gdbserver work. We keep the from pid |
| fifo opened till the invoker thread is finished. |
| This allows the gdbserver to finish sending its last reply. */ |
| if (close(to_pid) != 0) |
| ERROR(errno, "close to_pid\n"); |
| |
| /* if there is a task that was busy trying to wake up valgrind |
| process, we wait for it to be terminated otherwise threads |
| in the valgrind process can stay stopped if vgdb main |
| exits before the invoke thread had time to detach from |
| all valgrind threads. */ |
| if (max_invoke_ms > 0 || cmd_time_out != NEVER) { |
| int join; |
| |
| /* It is surprisingly complex to properly shutdown or exit the |
| valgrind process in which gdbserver has been invoked through |
| ptrace. In the normal case (gdb detaches from the process, |
| or process is continued), the valgrind process will reach the |
| breakpoint place. Using ptrace, vgdb will ensure the |
| previous activity of the process is resumed (e.g. restart a |
| blocking system call). The special case is when gdb asks the |
| valgrind process to exit (using either the "kill" command or |
| "monitor exit"). In such a case, the valgrind process will |
| call exit. But a ptraced process will be blocked in exit, |
| waiting for the ptracing process to detach or die. vgdb |
| cannot detach unconditionally as otherwise, in the normal |
| case, the valgrind process would stop abnormally with SIGSTOP |
| (as vgdb would not be there to catch it). vgdb can also not |
| die unconditionally otherwise again, similar problem. So, we |
| assume that most of the time, we arrive here in the normal |
| case, and so, the breakpoint has been encountered by the |
| valgrind process, so the invoker thread will exit and the |
| join will succeed. For the "kill" case, we cause an alarm |
| signal to be sent after a few seconds. This means that in the |
| normal case, the gdbserver code in valgrind process must have |
| returned the control in less than the alarm nr of seconds, |
| otherwise, valgrind will stop abnormally with SIGSTOP. */ |
| (void) alarm (3); |
| |
| DEBUG(1, "joining with invoke_gdbserver_in_valgrind_thread\n"); |
| join = pthread_join(invoke_gdbserver_in_valgrind_thread, NULL); |
| if (join != 0) |
| XERROR |
| (join, |
| "vgdb error pthread_join invoke_gdbserver_in_valgrind_thread\n"); |
| } |
| if (close(from_pid) != 0) |
| ERROR(errno, "close from_pid\n"); |
| } |
| |
| /* Relay data between gdb and Valgrind gdbserver, till EOF or an |
| error is encountered. */ |
| static |
| void gdb_relay (int pid) |
| { |
| int from_pid = -1; /* fd to read from pid */ |
| int to_pid = -1; /* fd to write to pid */ |
| |
| int shutdown_loop = 0; |
| fprintf (stderr, "relaying data between gdb and process %d\n", pid); |
| fflush (stderr); |
| |
| if (max_invoke_ms > 0) |
| pthread_create(&invoke_gdbserver_in_valgrind_thread, NULL, |
| invoke_gdbserver_in_valgrind, (void *) &pid); |
| to_pid = open_fifo(from_gdb_to_pid, O_WRONLY, "write to pid"); |
| acquire_lock (shared_mem_fd, pid); |
| |
| from_pid = open_fifo (to_gdb_from_pid, O_RDONLY|O_NONBLOCK, |
| "read mode from pid"); |
| |
| sigusr1_fd = to_pid; /* allow simulating user typing control-c */ |
| |
| while (1) { |
| ConnectionKind ck; |
| int ret; |
| struct pollfd pollfds[NumConnectionKind]; |
| |
| /* watch data written by gdb, watch POLLERR on both gdb fd */ |
| pollfds[FROM_GDB].fd = from_gdb; |
| pollfds[FROM_GDB].events = POLLIN; |
| pollfds[FROM_GDB].revents = 0; |
| pollfds[TO_GDB].fd = to_gdb; |
| pollfds[TO_GDB].events = 0; |
| pollfds[TO_GDB].revents = 0; |
| |
| /* watch data written by pid, watch POLLERR on both pid fd */ |
| pollfds[FROM_PID].fd = from_pid; |
| pollfds[FROM_PID].events = POLLIN; |
| pollfds[FROM_PID].revents = 0; |
| pollfds[TO_PID].fd = to_pid; |
| pollfds[TO_PID].events = 0; |
| pollfds[TO_PID].revents = 0; |
| |
| ret = poll(pollfds, |
| NumConnectionKind, |
| (shutting_down ? |
| 1 /* one second */ |
| : -1 /* infinite */)); |
| DEBUG(2, "poll ret %d errno %d\n", ret, errno); |
| |
| /* check for unexpected error */ |
| if (ret <= 0 && errno != EINTR) { |
| ERROR (errno, "unexpected poll ret %d\n", ret); |
| shutting_down = True; |
| break; |
| } |
| |
| /* check for data to read */ |
| for (ck = 0; ck < NumConnectionKind; ck ++) { |
| if (pollfds[ck].revents & POLLIN) { |
| switch (ck) { |
| case FROM_GDB: |
| if (!read_from_gdb_write_to_pid(to_pid)) |
| shutting_down = True; |
| break; |
| case FROM_PID: |
| if (!read_from_pid_write_to_gdb(from_pid)) |
| shutting_down = True; |
| break; |
| default: XERROR(0, "unexpected POLLIN on %s\n", |
| ppConnectionKind(ck)); |
| } |
| } |
| } |
| |
| /* check for an fd being in error condition */ |
| for (ck = 0; ck < NumConnectionKind; ck ++) { |
| if (pollfds[ck].revents & POLLERR) { |
| DEBUG(1, "connection %s fd %d POLLERR error condition\n", |
| ppConnectionKind(ck), pollfds[ck].fd); |
| invoker_valgrind_dying(); |
| shutting_down = True; |
| } |
| if (pollfds[ck].revents & POLLHUP) { |
| DEBUG(1, "connection %s fd %d POLLHUP error condition\n", |
| ppConnectionKind(ck), pollfds[ck].fd); |
| invoker_valgrind_dying(); |
| shutting_down = True; |
| } |
| if (pollfds[ck].revents & POLLNVAL) { |
| DEBUG(1, "connection %s fd %d POLLNVAL error condition\n", |
| ppConnectionKind(ck), pollfds[ck].fd); |
| invoker_valgrind_dying(); |
| shutting_down = True; |
| } |
| } |
| |
| if (shutting_down) { |
| /* we let some time to the final packets to be transferred */ |
| shutdown_loop++; |
| if (shutdown_loop > 3) |
| break; |
| } |
| } |
| close_connection(to_pid, from_pid); |
| } |
| |
| static int packet_len_for_command(char *cmd) |
| { |
| /* cmd will be send as a packet $qRcmd,xxxx....................xx#cc */ |
| return 7+ 2*strlen(cmd) +3 + 1; |
| } |
| |
| /* hyper-minimal protocol implementation that |
| sends the provided commands (using qRcmd packets) |
| and read and display their replies. */ |
| static |
| void standalone_send_commands(int pid, |
| int last_command, |
| char *commands[] ) |
| { |
| int from_pid = -1; /* fd to read from pid */ |
| int to_pid = -1; /* fd to write to pid */ |
| |
| int i; |
| int hi; |
| char hex[3]; |
| unsigned char cksum; |
| char *hexcommand; |
| char buf[PBUFSIZ+1]; // +1 for trailing \0 |
| int buflen; |
| int nc; |
| |
| |
| if (max_invoke_ms > 0 || cmd_time_out != NEVER) |
| pthread_create(&invoke_gdbserver_in_valgrind_thread, NULL, |
| invoke_gdbserver_in_valgrind, (void *) &pid); |
| |
| to_pid = open_fifo(from_gdb_to_pid, O_WRONLY, "write to pid"); |
| acquire_lock (shared_mem_fd, pid); |
| |
| /* first send a C-c \003 to pid, so that it wakes up the process |
| After that, we can open the fifo from the pid in read mode |
| We then start to wait for packets (normally first a resume reply) |
| At that point, we send our command and expect replies */ |
| buf[0] = '\003'; |
| i = 0; |
| while (!write_buf(to_pid, buf, 1, |
| "write \\003 to wake up", /* notify */ True)) { |
| /* If write fails, retries up to 10 times every 0.5 seconds |
| This aims at solving the race condition described in |
| remote-utils.c remote_finish function. */ |
| usleep(500*1000); |
| i++; |
| if (i >= 10) |
| XERROR (errno, "failed to send wake up char after 10 trials\n"); |
| } |
| from_pid = open_fifo(to_gdb_from_pid, O_RDONLY, |
| "read cmd result from pid"); |
| |
| for (nc = 0; nc <= last_command; nc++) { |
| fprintf (stderr, "sending command %s to pid %d\n", commands[nc], pid); |
| fflush (stderr); |
| |
| /* prepare hexcommand $qRcmd,xxxx....................xx#cc */ |
| hexcommand = vmalloc (packet_len_for_command(commands[nc])); |
| hexcommand[0] = 0; |
| strcat (hexcommand, "$qRcmd,"); |
| for (i = 0; i < strlen(commands[nc]); i++) { |
| sprintf(hex, "%02x", (unsigned char) commands[nc][i]); |
| // Need to use unsigned char, to avoid sign extension. |
| strcat (hexcommand, hex); |
| } |
| /* checksum (but without the $) */ |
| cksum = 0; |
| for (hi = 1; hi < strlen(hexcommand); hi++) |
| cksum+=hexcommand[hi]; |
| strcat(hexcommand, "#"); |
| sprintf(hex, "%02x", cksum); |
| strcat(hexcommand, hex); |
| write_buf(to_pid, hexcommand, strlen(hexcommand), |
| "writing hex command to pid", /* notify */ True); |
| |
| /* we exit of the below loop explicitely when the command has |
| been handled or because a signal handler will set |
| shutting_down. */ |
| while (!shutting_down) { |
| buflen = getpkt(buf, from_pid, to_pid); |
| if (buflen < 0) { |
| ERROR (0, "error reading packet\n"); |
| if (buflen == -2) |
| invoker_valgrind_dying(); |
| break; |
| } |
| if (strlen(buf) == 0) { |
| DEBUG(0, "empty packet rcvd (packet qRcmd not recognised?)\n"); |
| break; |
| } |
| if (strcmp(buf, "OK") == 0) { |
| DEBUG(1, "OK packet rcvd\n"); |
| break; |
| } |
| if (buf[0] == 'E') { |
| DEBUG(0, |
| "E NN error packet rcvd: %s (unknown monitor command?)\n", |
| buf); |
| break; |
| } |
| if (buf[0] == 'W') { |
| DEBUG(0, "W stopped packet rcvd: %s\n", buf); |
| break; |
| } |
| if (buf[0] == 'T') { |
| DEBUG(1, "T resume reply packet received: %s\n", buf); |
| continue; |
| } |
| |
| /* must be here an O packet with hex encoded string reply |
| => decode and print it */ |
| if (buf[0] != 'O') { |
| DEBUG(0, "expecting O packet, received: %s\n", buf); |
| continue; |
| } |
| { |
| char buf_print[buflen/2 + 1]; |
| for (i = 1; i < buflen; i = i + 2) |
| buf_print[i/2] = (fromhex(*(buf+i)) << 4) |
| + fromhex(*(buf+i+1)); |
| buf_print[buflen/2] = 0; |
| printf("%s", buf_print); |
| fflush(stdout); |
| } |
| } |
| free (hexcommand); |
| } |
| shutting_down = True; |
| |
| close_connection(to_pid, from_pid); |
| } |
| |
| /* report to user the existence of a vgdb-able valgrind process |
| with given pid. |
| Note: this function does not use XERROR if an error is encountered |
| while producing the command line for pid, as this is not critical |
| and at least on MacOS, reading cmdline is not available. */ |
| static |
| void report_pid (int pid, Bool on_stdout) |
| { |
| char cmdline_file[50]; // large enough |
| int fd, i; |
| FILE *out = on_stdout ? stdout : stderr; |
| |
| fprintf(out, "use --pid=%d for ", pid); |
| |
| sprintf(cmdline_file, "/proc/%d/cmdline", pid); |
| fd = open (cmdline_file, O_RDONLY); |
| if (fd == -1) { |
| DEBUG(1, "error opening cmdline file %s %s\n", |
| cmdline_file, strerror(errno)); |
| fprintf(out, "(could not open process command line)\n"); |
| } else { |
| char cmdline[100]; |
| ssize_t sz; |
| while ((sz = read(fd, cmdline, sizeof cmdline - 1)) != 0) { |
| for (i = 0; i < sz; i++) |
| if (cmdline[i] == 0) |
| cmdline[i] = ' '; |
| cmdline[sz] = 0; |
| fprintf(out, "%s", cmdline); |
| } |
| if (sz == -1) { |
| DEBUG(1, "error reading cmdline file %s %s\n", |
| cmdline_file, strerror(errno)); |
| fprintf(out, "(error reading process command line)"); |
| } |
| fprintf(out, "\n"); |
| close (fd); |
| } |
| fflush(out); |
| } |
| |
| static |
| void usage(void) |
| { |
| fprintf(stderr, |
| "Usage: vgdb [OPTION]... [[-c] COMMAND]...\n" |
| "vgdb (valgrind gdb) has two usages\n" |
| " 1. standalone to send monitor commands to a Valgrind gdbserver.\n" |
| " The OPTION(s) must be followed by the command to send\n" |
| " To send more than one command, separate the commands with -c\n" |
| " 2. relay application between gdb and a Valgrind gdbserver.\n" |
| " Only OPTION(s) can be given.\n" |
| "\n" |
| " OPTIONS are [--pid=<number>] [--vgdb-prefix=<prefix>]\n" |
| " [--wait=<number>] [--max-invoke-ms=<number>]\n" |
| " [--port=<portnr>\n" |
| " [--cmd-time-out=<number>] [-l] [-D] [-d]\n" |
| " \n" |
| " --pid arg must be given if multiple Valgrind gdbservers are found.\n" |
| " --vgdb-prefix arg must be given to both Valgrind and vgdb utility\n" |
| " if you want to change the prefix (default %s) for the FIFOs communication\n" |
| " between the Valgrind gdbserver and vgdb.\n" |
| " --wait (default 0) tells vgdb to check during the specified number\n" |
| " of seconds if a Valgrind gdbserver can be found.\n" |
| " --max-invoke-ms (default 100) gives the nr of milli-seconds after which vgdb\n" |
| " will force the invocation of the Valgrind gdbserver (if the Valgrind\n" |
| " process is blocked in a system call).\n" |
| " --port instructs vgdb to listen for gdb on the specified port nr.\n" |
| " --cmd-time-out (default 99999999) tells vgdb to exit if the found Valgrind\n" |
| " gdbserver has not processed a command after number seconds\n" |
| " -l arg tells to show the list of running Valgrind gdbserver and then exit.\n" |
| " -D arg tells to show shared mem status and then exit.\n" |
| " -d arg tells to show debug info. Multiple -d args for more debug info\n" |
| "\n" |
| " -h --help shows this message\n" |
| " To get help from the Valgrind gdbserver, use vgdb help\n" |
| "\n", vgdb_prefix_default() |
| ); |
| invoker_restrictions_msg(); |
| } |
| |
| /* If show_list, outputs on stdout the list of Valgrind processes with gdbserver activated. |
| and then exits. |
| |
| else if arg_pid == -1, waits maximum check_trials seconds to discover |
| a valgrind pid appearing. |
| |
| Otherwise verify arg_pid is valid and corresponds to a Valgrind process |
| with gdbserver activated. |
| |
| Returns the pid to work with |
| or exits in case of error (e.g. no pid found corresponding to arg_pid */ |
| |
| static |
| int search_arg_pid(int arg_pid, int check_trials, Bool show_list) |
| { |
| int i; |
| int pid = -1; |
| |
| if (arg_pid == 0 || arg_pid < -1) { |
| fprintf (stderr, "vgdb error: invalid pid %d given\n", arg_pid); |
| exit (1); |
| } else { |
| /* search for a matching named fifo. |
| If we have been given a pid, we will check that the matching FIFO is |
| there (or wait the nr of check_trials for this to appear). |
| If no pid has been given, then if we find only one FIFO, |
| we will use this to build the pid to use. |
| If we find multiple processes with valid FIFO, we report them and will |
| exit with an error. */ |
| DIR *vgdb_dir; |
| char *vgdb_dir_name = vmalloc (strlen (vgdb_prefix) + 3); |
| struct dirent *f; |
| int is; |
| int nr_valid_pid = 0; |
| const char *suffix = "-from-vgdb-to-"; /* followed by pid */ |
| char *vgdb_format = vmalloc (strlen(vgdb_prefix) + strlen(suffix) + 1); |
| |
| strcpy (vgdb_format, vgdb_prefix); |
| strcat (vgdb_format, suffix); |
| |
| if (strchr(vgdb_prefix, '/') != NULL) { |
| strcpy (vgdb_dir_name, vgdb_prefix); |
| for (is = strlen(vgdb_prefix) - 1; is >= 0; is--) |
| if (vgdb_dir_name[is] == '/') { |
| vgdb_dir_name[is+1] = '\0'; |
| break; |
| } |
| } else { |
| strcpy (vgdb_dir_name, ""); |
| } |
| |
| DEBUG(1, "searching pid in directory %s format %s\n", |
| vgdb_dir_name, vgdb_format); |
| |
| /* try to find FIFOs with valid pid. |
| On exit of the loop, pid is set to: |
| the last pid found if show_list (or -1 if no process was listed) |
| -1 if no FIFOs matching a running process is found |
| -2 if multiple FIFOs of running processes are found |
| otherwise it is set to the (only) pid found that can be debugged |
| */ |
| for (i = 0; i < check_trials; i++) { |
| DEBUG(1, "check_trial %d \n", i); |
| if (i > 0) |
| /* wait one second before checking again */ |
| sleep(1); |
| |
| vgdb_dir = opendir (strlen (vgdb_dir_name) ? vgdb_dir_name : "./"); |
| if (vgdb_dir == NULL) |
| XERROR (errno, |
| "vgdb error: opening directory %s searching vgdb fifo\n", |
| vgdb_dir_name); |
| |
| errno = 0; /* avoid complain if vgdb_dir is empty */ |
| while ((f = readdir (vgdb_dir))) { |
| struct stat st; |
| char pathname[strlen(vgdb_dir_name) + strlen(f->d_name) + 1]; |
| char *wrongpid; |
| int newpid; |
| |
| strcpy (pathname, vgdb_dir_name); |
| strcat (pathname, f->d_name); |
| DEBUG(3, "checking pathname is FIFO %s\n", pathname); |
| if (stat (pathname, &st) != 0) { |
| if (debuglevel >= 3) |
| ERROR (errno, "vgdb error: stat %s searching vgdb fifo\n", |
| pathname); |
| } else if (S_ISFIFO (st.st_mode)) { |
| DEBUG(3, "trying FIFO %s\n", pathname); |
| if (strncmp (pathname, vgdb_format, |
| strlen (vgdb_format)) == 0) { |
| newpid = strtol(pathname + strlen (vgdb_format), |
| &wrongpid, 10); |
| if (*wrongpid == '-' && newpid > 0 |
| && kill (newpid, 0) == 0) { |
| nr_valid_pid++; |
| if (show_list) { |
| report_pid (newpid, /*on_stdout*/ True); |
| pid = newpid; |
| } else if (arg_pid != -1) { |
| if (arg_pid == newpid) { |
| pid = newpid; |
| } |
| } else if (nr_valid_pid > 1) { |
| if (nr_valid_pid == 2) { |
| fprintf |
| (stderr, |
| "no --pid= arg given" |
| " and multiple valgrind pids found:\n"); |
| report_pid (pid, /*on_stdout*/ False); |
| } |
| pid = -2; |
| report_pid (newpid, /*on_stdout*/ False); |
| } else { |
| pid = newpid; |
| } |
| } |
| } |
| } |
| errno = 0; /* avoid complain if at the end of vgdb_dir */ |
| } |
| if (f == NULL && errno != 0) |
| XERROR (errno, "vgdb error: reading directory %s for vgdb fifo\n", |
| vgdb_dir_name); |
| |
| closedir (vgdb_dir); |
| if (pid != -1) |
| break; |
| } |
| |
| free (vgdb_dir_name); |
| free (vgdb_format); |
| } |
| |
| if (show_list) { |
| exit (1); |
| } else if (pid == -1) { |
| if (arg_pid == -1) |
| fprintf (stderr, "vgdb error: no FIFO found and no pid given\n"); |
| else |
| fprintf (stderr, "vgdb error: no FIFO found matching pid %d\n", |
| arg_pid); |
| exit (1); |
| } |
| else if (pid == -2) { |
| /* no arg_pid given, multiple FIFOs found */ |
| exit (1); |
| } |
| else { |
| return pid; |
| } |
| } |
| |
| /* return true if the numeric value of an option of the |
| form --xxxxxxxxx=<number> could properly be extracted |
| from arg. If True is returned, *value contains the |
| extracted value.*/ |
| static |
| Bool numeric_val(char* arg, int *value) |
| { |
| const char *eq_pos = strchr(arg, '='); |
| char *wrong; |
| long long int long_value; |
| |
| if (eq_pos == NULL) |
| return False; |
| |
| long_value = strtoll(eq_pos+1, &wrong, 10); |
| if (long_value < 0 || long_value > INT_MAX) |
| return False; |
| if (*wrong) |
| return False; |
| |
| *value = (int) long_value; |
| return True; |
| } |
| |
| /* true if arg matches the provided option */ |
| static |
| Bool is_opt(char* arg, const char *option) |
| { |
| int option_len = strlen(option); |
| if (option[option_len-1] == '=') |
| return (0 == strncmp(option, arg, option_len)); |
| else |
| return (0 == strcmp(option, arg)); |
| } |
| |
| /* Parse command lines options. If error(s), exits. |
| Otherwise returns the options in *p_... args. |
| commands must be big enough for the commands extracted from argv. |
| On return, *p_last_command gives the position in commands where |
| the last command has been allocated (using vmalloc). */ |
| static |
| void parse_options(int argc, char** argv, |
| Bool *p_show_shared_mem, |
| Bool *p_show_list, |
| int *p_arg_pid, |
| int *p_check_trials, |
| int *p_port, |
| int *p_last_command, |
| char *commands[]) |
| { |
| Bool show_shared_mem = False; |
| Bool show_list = False; |
| int arg_pid = -1; |
| int check_trials = 1; |
| int last_command = -1; |
| int int_port = 0; |
| |
| int i; |
| int arg_errors = 0; |
| |
| for (i = 1; i < argc; i++) { |
| if (is_opt(argv[i], "--help") || is_opt(argv[i], "-h")) { |
| usage(); |
| exit(0); |
| } else if (is_opt(argv[i], "-d")) { |
| debuglevel++; |
| } else if (is_opt(argv[i], "-D")) { |
| show_shared_mem = True; |
| } else if (is_opt(argv[i], "-l")) { |
| show_list = True; |
| } else if (is_opt(argv[i], "--pid=")) { |
| int newpid; |
| if (!numeric_val(argv[i], &newpid)) { |
| fprintf (stderr, "invalid --pid argument %s\n", argv[i]); |
| arg_errors++; |
| } else if (arg_pid != -1) { |
| fprintf (stderr, "multiple --pid arguments given\n"); |
| arg_errors++; |
| } else { |
| arg_pid = newpid; |
| } |
| } else if (is_opt(argv[i], "--wait=")) { |
| if (!numeric_val(argv[i], &check_trials)) { |
| fprintf (stderr, "invalid --wait argument %s\n", argv[i]); |
| arg_errors++; |
| } |
| } else if (is_opt(argv[i], "--max-invoke-ms=")) { |
| if (!numeric_val(argv[i], &max_invoke_ms)) { |
| fprintf (stderr, "invalid --max-invoke-ms argument %s\n", argv[i]); |
| arg_errors++; |
| } |
| } else if (is_opt(argv[i], "--cmd-time-out=")) { |
| if (!numeric_val(argv[i], &cmd_time_out)) { |
| fprintf (stderr, "invalid --cmd-time-out argument %s\n", argv[i]); |
| arg_errors++; |
| } |
| } else if (is_opt(argv[i], "--port=")) { |
| if (!numeric_val(argv[i], &int_port)) { |
| fprintf (stderr, "invalid --port argument %s\n", argv[i]); |
| arg_errors++; |
| } |
| } else if (is_opt(argv[i], "--vgdb-prefix=")) { |
| vgdb_prefix = argv[i] + 14; |
| } else if (is_opt(argv[i], "-c")) { |
| last_command++; |
| commands[last_command] = vmalloc (1); |
| commands[last_command][0] = '\0'; |
| } else if (0 == strncmp(argv[i], "-", 1)) { |
| fprintf (stderr, "unknown or invalid argument %s\n", argv[i]); |
| arg_errors++; |
| } else { |
| int len; |
| if (last_command == -1) { |
| /* only one command, no -c command indicator */ |
| last_command++; |
| commands[last_command] = vmalloc (1); |
| commands[last_command][0] = '\0'; |
| } |
| len = strlen(commands[last_command]); |
| commands[last_command] = vrealloc (commands[last_command], |
| len + 1 + strlen(argv[i]) + 1); |
| if (len > 0) |
| strcat (commands[last_command], " "); |
| strcat (commands[last_command], argv[i]); |
| if (packet_len_for_command(commands[last_command]) > PBUFSIZ) { |
| fprintf (stderr, "command %s too long\n", commands[last_command]); |
| arg_errors++; |
| } |
| |
| } |
| } |
| |
| if (vgdb_prefix == NULL) |
| vgdb_prefix = vgdb_prefix_default(); |
| |
| if (isatty(0) |
| && !show_shared_mem |
| && !show_list |
| && int_port == 0 |
| && last_command == -1) { |
| arg_errors++; |
| fprintf (stderr, |
| "Using vgdb standalone implies to give -D or -l or a COMMAND\n"); |
| } |
| |
| if (show_shared_mem && show_list) { |
| arg_errors++; |
| fprintf (stderr, |
| "Can't use both -D and -l options\n"); |
| } |
| |
| if (max_invoke_ms > 0 |
| && cmd_time_out != NEVER |
| && (cmd_time_out * 1000) <= max_invoke_ms) { |
| arg_errors++; |
| fprintf (stderr, |
| "--max-invoke-ms must be < --cmd-time-out * 1000\n"); |
| } |
| |
| if (show_list && arg_pid != -1) { |
| arg_errors++; |
| fprintf (stderr, |
| "Can't use both --pid and -l options\n"); |
| } |
| |
| if (int_port > 0 && last_command != -1) { |
| arg_errors++; |
| fprintf (stderr, |
| "Can't use --port to send commands\n"); |
| } |
| |
| if (arg_errors > 0) { |
| fprintf (stderr, "args error. Try `vgdb --help` for more information\n"); |
| exit(1); |
| } |
| |
| *p_show_shared_mem = show_shared_mem; |
| *p_show_list = show_list; |
| *p_arg_pid = arg_pid; |
| *p_check_trials = check_trials; |
| *p_port = int_port; |
| *p_last_command = last_command; |
| } |
| |
| int main(int argc, char** argv) |
| { |
| int i; |
| int pid; |
| |
| Bool show_shared_mem; |
| Bool show_list; |
| int arg_pid; |
| int check_trials; |
| int in_port; |
| int last_command; |
| char *commands[argc]; // we will never have more commands than args. |
| |
| parse_options(argc, argv, |
| &show_shared_mem, |
| &show_list, |
| &arg_pid, |
| &check_trials, |
| &in_port, |
| &last_command, |
| commands); |
| |
| /* when we are working as a relay for gdb, handle some signals by |
| only reporting them (according to debug level). Also handle these |
| when ptrace will be used: vgdb must clean up the ptrace effect before |
| dying. */ |
| if (max_invoke_ms > 0 || last_command == -1) |
| install_handlers(); |
| |
| pid = search_arg_pid (arg_pid, check_trials, show_list); |
| |
| prepare_fifos_and_shared_mem(pid); |
| |
| if (in_port > 0) |
| wait_for_gdb_connect(in_port); |
| |
| if (show_shared_mem) { |
| fprintf(stderr, |
| "vgdb %d " |
| "written_by_vgdb %d " |
| "seen_by_valgrind %d\n" |
| "vgdb pid %d\n", |
| VS_vgdb_pid, |
| VS_written_by_vgdb, |
| VS_seen_by_valgrind, |
| VS_vgdb_pid); |
| exit (0); |
| } |
| |
| if (last_command >= 0) { |
| standalone_send_commands(pid, last_command, commands); |
| } else { |
| gdb_relay(pid); |
| } |
| |
| |
| free (from_gdb_to_pid); |
| free (to_gdb_from_pid); |
| free (shared_mem); |
| |
| for (i = 0; i <= last_command; i++) |
| free (commands[i]); |
| return 0; |
| } |