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>
5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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.
35 #include <sys/types.h>
38 #include <sys/param.h>
40 #include <sys/resource.h>
49 #if defined(IA64) && defined(LINUX)
50 # include <asm/ptrace_offsets.h>
58 #include <sys/stropts.h>
66 int debug = 0, followfork = 0, followvfork = 0, interactive = 0;
67 int rflag = 0, tflag = 0, dtime = 0, cflag = 0;
68 int iflag = 0, xflag = 0, qflag = 0;
71 /* Sometimes we want to print only succeeding syscalls. */
72 int not_failing_only = 0;
74 char *username = NULL;
78 int acolumn = DEFAULT_ACOLUMN;
79 int max_strlen = DEFAULT_STRLEN;
80 char *outfname = NULL;
83 unsigned int nprocs, tcbtabsize;
85 extern char **environ;
87 static int trace P((void));
88 static void cleanup P((void));
89 static void interrupt P((int sig));
90 static sigset_t empty_set, blocked_set;
92 #ifdef HAVE_SIG_ATOMIC_T
93 static volatile sig_atomic_t interrupted;
94 #else /* !HAVE_SIG_ATOMIC_T */
96 static volatile int interrupted;
98 static int interrupted;
99 #endif /* !__STDC__ */
100 #endif /* !HAVE_SIG_ATOMIC_T */
104 static struct tcb *pfd2tcb P((int pfd));
105 static void reaper P((int sig));
106 static void rebuild_pollv P((void));
107 static struct pollfd *pollv;
109 #ifndef HAVE_POLLABLE_PROCFS
111 static void proc_poll_open P((void));
112 static void proc_poller P((int pfd));
120 static int poller_pid;
121 static int proc_poll_pipe[2] = { -1, -1 };
123 #endif /* !HAVE_POLLABLE_PROCFS */
125 #ifdef HAVE_MP_PROCFS
126 #define POLLWANT POLLWRNORM
128 #define POLLWANT POLLPRI
130 #endif /* USE_PROCFS */
138 usage: strace [-dffhiqrtttTvVxx] [-a column] [-e expr] ... [-o file]\n\
139 [-p pid] ... [-s strsize] [-u username] [-E var=val] ...\n\
140 [command [arg ...]]\n\
141 or: strace -c [-e expr] ... [-O overhead] [-S sortby] [-E var=val] ...\n\
142 [command [arg ...]]\n\
143 -c -- count time, calls, and errors for each syscall and report summary\n\
144 -f -- follow forks, -ff -- with output into separate files\n\
145 -F -- attempt to follow vforks, -h -- print help message\n\
146 -i -- print instruction pointer at time of syscall\n\
147 -q -- suppress messages about attaching, detaching, etc.\n\
148 -r -- print relative timestamp, -t -- absolute timestamp, -tt -- with usecs\n\
149 -T -- print time spent in each syscall, -V -- print version\n\
150 -v -- verbose mode: print unabbreviated argv, stat, termio[s], etc. args\n\
151 -x -- print non-ascii strings in hex, -xx -- print all strings in hex\n\
152 -a column -- alignment COLUMN for printing syscall results (default %d)\n\
153 -e expr -- a qualifying expression: option=[!]all or option=[!]val1[,val2]...\n\
154 options: trace, abbrev, verbose, raw, signal, read, or write\n\
155 -o file -- send trace output to FILE instead of stderr\n\
156 -O overhead -- set overhead for tracing syscalls to OVERHEAD usecs\n\
157 -p pid -- trace process with process id PID, may be repeated\n\
158 -s strsize -- limit length of print strings to STRSIZE chars (default %d)\n\
159 -S sortby -- sort syscall counts by: time, calls, name, nothing (default %s)\n\
160 -u username -- run command as username handling setuid and/or setgid\n\
161 -E var=val -- put var=val in the environment for command\n\
162 -E var -- remove var from the environment for command\n\
163 " /* this is broken, so don't document it
164 -z -- print only succeeding syscalls\n\
166 , DEFAULT_ACOLUMN, DEFAULT_STRLEN, DEFAULT_SORTBY);
190 static char buf[BUFSIZ];
192 /* Allocate the initial tcbtab. */
193 tcbtabsize = argc; /* Surely enough for all -p args. */
194 tcbtab = (struct tcb **) malloc (tcbtabsize * sizeof tcbtab[0]);
195 tcbtab[0] = (struct tcb *) calloc (tcbtabsize, sizeof *tcbtab[0]);
196 for (tcp = tcbtab[0]; tcp < &tcbtab[0][tcbtabsize]; ++tcp)
197 tcbtab[tcp - tcbtab[0]] = &tcbtab[0][tcp - tcbtab[0]];
202 qualify("trace=all");
203 qualify("abbrev=all");
204 qualify("verbose=all");
205 qualify("signal=all");
206 set_sortby(DEFAULT_SORTBY);
207 set_personality(DEFAULT_PERSONALITY);
208 while ((c = getopt(argc, argv,
209 "+cdfFhiqrtTvVxza:e:o:O:p:s:S:u:E:")) != EOF) {
247 qualify("abbrev=none");
250 printf("%s -- version %s\n", PACKAGE_NAME, VERSION);
254 not_failing_only = 1;
257 acolumn = atoi(optarg);
263 outfname = strdup(optarg);
266 set_overhead(atoi(optarg));
269 if ((pid = atoi(optarg)) <= 0) {
270 fprintf(stderr, "%s: Invalid process id: %s\n",
274 if (pid == getpid()) {
275 fprintf(stderr, "%s: I'm sorry, I can't let you do that, Dave.\n", progname);
278 if ((tcp = alloctcb(pid)) == NULL) {
279 fprintf(stderr, "%s: out of memory\n",
283 tcp->flags |= TCB_ATTACHED;
287 max_strlen = atoi(optarg);
288 if (max_strlen < 0) {
290 "%s: invalid -s argument: %s\n",
299 username = strdup(optarg);
302 if (putenv(optarg) < 0) {
303 fprintf(stderr, "%s: out of memory\n",
314 if (optind == argc && !pflag_seen)
317 /* See if they want to run as another user. */
318 if (username != NULL) {
321 if (getuid() != 0 || geteuid() != 0) {
323 "%s: you must be root to use the -u option\n",
327 if ((pent = getpwnam(username)) == NULL) {
328 fprintf(stderr, "%s: cannot find user `%s'\n",
332 run_uid = pent->pw_uid;
333 run_gid = pent->pw_gid;
341 setreuid(geteuid(), getuid());
344 /* Check if they want to redirect the output. */
348 /* See if they want to pipe the output. */
349 if (outfname[0] == '|' || outfname[0] == '!') {
351 * We can't do the <outfname>.PID funny business
352 * when using popen, so prohibit it.
354 if (followfork > 1) {
356 %s: piping the output and -ff are mutually exclusive options\n",
361 if ((outf = popen(outfname + 1, "w")) == NULL) {
362 fprintf(stderr, "%s: can't popen '%s': %s\n",
363 progname, outfname + 1,
368 else if ((outf = fopen(outfname, "w")) == NULL) {
369 fprintf(stderr, "%s: can't fopen '%s': %s\n",
370 progname, outfname, strerror(errno));
374 if ((f=fcntl(fileno(outf), F_GETFD)) < 0 ) {
375 perror("failed to get flags for outputfile");
379 if (fcntl(fileno(outf), F_SETFD, f|FD_CLOEXEC) < 0 ) {
380 perror("failed to set flags for outputfile");
386 setreuid(geteuid(), getuid());
389 if (!outfname || outfname[0] == '|' || outfname[0] == '!')
390 setvbuf(outf, buf, _IOLBF, BUFSIZ);
391 if (outfname && optind < argc) {
396 for (c = 0; c < tcbtabsize; c++) {
398 /* Reinitialize the output since it may have changed. */
400 if (!(tcp->flags & TCB_INUSE) || !(tcp->flags & TCB_ATTACHED))
403 if (proc_open(tcp, 1) < 0) {
404 fprintf(stderr, "trouble opening proc file\n");
408 #else /* !USE_PROCFS */
410 if (tcp->flags & TCB_CLONE_THREAD)
413 char procdir[MAXPATHLEN];
415 sprintf(procdir, "/proc/%d/task", tcp->pid);
416 dir = opendir(procdir);
418 unsigned int ntid = 0, nerr = 0;
421 while ((de = readdir(dir)) != NULL) {
422 if (de->d_fileno == 0 ||
423 de->d_name[0] == '.')
425 tid = atoi(de->d_name);
429 if (ptrace(PTRACE_ATTACH, tid,
432 else if (tid != tcbtab[c]->pid) {
433 if (nprocs == tcbtabsize &&
439 fprintf(stderr, "%s: out of memory\n",
443 tcp->flags |= TCB_ATTACHED|TCB_CLONE_THREAD|TCB_CLONE_DETACHED|TCB_FOLLOWFORK;
444 tcbtab[c]->nchildren++;
445 tcbtab[c]->nclone_threads++;
446 tcbtab[c]->nclone_detached++;
447 tcp->parent = tcbtab[c];
452 perror("attach: ptrace(PTRACE_ATTACH, ...)");
460 Process %u attached with %u threads - interrupt to quit\n",
464 Process %u attached - interrupt to quit\n",
471 if (ptrace(PTRACE_ATTACH, tcp->pid, (char *) 1, 0) < 0) {
472 perror("attach: ptrace(PTRACE_ATTACH, ...)");
476 #endif /* !USE_PROCFS */
479 "Process %u attached - interrupt to quit\n",
486 char pathname[MAXPATHLEN];
488 filename = argv[optind];
489 if (strchr(filename, '/')) {
490 if (strlen(filename) > sizeof pathname - 1) {
491 errno = ENAMETOOLONG;
492 perror("strace: exec");
495 strcpy(pathname, filename);
497 #ifdef USE_DEBUGGING_EXEC
499 * Debuggers customarily check the current directory
500 * first regardless of the path but doing that gives
501 * security geeks a panic attack.
503 else if (stat(filename, &statbuf) == 0)
504 strcpy(pathname, filename);
505 #endif /* USE_DEBUGGING_EXEC */
510 for (path = getenv("PATH"); path && *path; path += m) {
511 if (strchr(path, ':')) {
512 n = strchr(path, ':') - path;
516 m = n = strlen(path);
518 getcwd(pathname, MAXPATHLEN);
519 len = strlen(pathname);
521 else if (n > sizeof pathname - 1)
524 strncpy(pathname, path, n);
527 if (len && pathname[len - 1] != '/')
528 pathname[len++] = '/';
529 strcpy(pathname + len, filename);
530 if (stat(pathname, &statbuf) == 0 &&
531 /* Accept only regular files
532 with some execute bits set.
533 XXX not perfect, might still fail */
534 S_ISREG(statbuf.st_mode) &&
535 (statbuf.st_mode & 0111))
539 if (stat(pathname, &statbuf) < 0) {
540 fprintf(stderr, "%s: %s: command not found\n",
544 switch (pid = fork()) {
546 perror("strace: fork");
552 if (outf != stderr) close (fileno (outf));
554 /* Kludge for SGI, see proc_open for details. */
555 sa.sa_handler = foobar;
557 sigemptyset(&sa.sa_mask);
558 sigaction(SIGINT, &sa, NULL);
563 kill(getpid(), SIGSTOP); /* stop HERE */
565 #else /* !USE_PROCFS */
567 close(fileno (outf));
569 if (ptrace(PTRACE_TRACEME, 0, (char *) 1, 0) < 0) {
570 perror("strace: ptrace(PTRACE_TRACEME, ...)");
574 kill(getpid(), SIGSTOP);
576 if (username != NULL || geteuid() == 0) {
577 uid_t run_euid = run_uid;
578 gid_t run_egid = run_gid;
580 if (statbuf.st_mode & S_ISUID)
581 run_euid = statbuf.st_uid;
582 if (statbuf.st_mode & S_ISGID)
583 run_egid = statbuf.st_gid;
586 * It is important to set groups before we
587 * lose privileges on setuid.
589 if (username != NULL) {
590 if (initgroups(username, run_gid) < 0) {
591 perror("initgroups");
594 if (setregid(run_gid, run_egid) < 0) {
598 if (setreuid(run_uid, run_euid) < 0) {
605 setreuid(run_uid, run_uid);
608 * Induce an immediate stop so that the parent
609 * will resume us with PTRACE_SYSCALL and display
610 * this execve call normally.
612 kill(getpid(), SIGSTOP);
613 #endif /* !USE_PROCFS */
615 execv(pathname, &argv[optind]);
616 perror("strace: exec");
621 if ((tcp = alloctcb(pid)) == NULL) {
622 fprintf(stderr, "tcb table full\n");
627 if (proc_open(tcp, 0) < 0) {
628 fprintf(stderr, "trouble opening proc file\n");
632 #endif /* USE_PROCFS */
637 sigemptyset(&empty_set);
638 sigemptyset(&blocked_set);
639 sa.sa_handler = SIG_IGN;
640 sigemptyset(&sa.sa_mask);
642 sigaction(SIGTTOU, &sa, NULL);
643 sigaction(SIGTTIN, &sa, NULL);
645 sigaddset(&blocked_set, SIGHUP);
646 sigaddset(&blocked_set, SIGINT);
647 sigaddset(&blocked_set, SIGQUIT);
648 sigaddset(&blocked_set, SIGPIPE);
649 sigaddset(&blocked_set, SIGTERM);
650 sa.sa_handler = interrupt;
652 /* POSIX signals on sunos4.1 are a little broken. */
653 sa.sa_flags = SA_INTERRUPT;
656 sigaction(SIGHUP, &sa, NULL);
657 sigaction(SIGINT, &sa, NULL);
658 sigaction(SIGQUIT, &sa, NULL);
659 sigaction(SIGPIPE, &sa, NULL);
660 sigaction(SIGTERM, &sa, NULL);
662 sa.sa_handler = reaper;
663 sigaction(SIGCHLD, &sa, NULL);
665 /* Make sure SIGCHLD has the default action so that waitpid
666 definitely works without losing track of children. The user
667 should not have given us a bogus state to inherit, but he might
668 have. Arguably we should detect SIG_IGN here and pass it on
669 to children, but probably noone really needs that. */
670 sa.sa_handler = SIG_DFL;
671 sigaction(SIGCHLD, &sa, NULL);
672 #endif /* USE_PROCFS */
684 char name[MAXPATHLEN];
687 if (outfname && followfork > 1) {
688 sprintf(name, "%s.%u", outfname, tcp->pid);
690 setreuid(geteuid(), getuid());
692 fp = fopen(name, "w");
694 setreuid(geteuid(), getuid());
708 /* Allocate some more TCBs and expand the table.
709 We don't want to relocate the TCBs because our
710 callers have pointers and it would be a pain.
711 So tcbtab is a table of pointers. Since we never
712 free the TCBs, we allocate a single chunk of many. */
713 struct tcb **newtab = (struct tcb **)
714 realloc(tcbtab, 2 * tcbtabsize * sizeof tcbtab[0]);
715 struct tcb *newtcbs = (struct tcb *) calloc(tcbtabsize,
718 if (newtab == NULL || newtcbs == NULL) {
723 for (i = tcbtabsize; i < 2 * tcbtabsize; ++i)
724 newtab[i] = &newtcbs[i - tcbtabsize];
739 for (i = 0; i < tcbtabsize; i++) {
741 if ((tcp->flags & TCB_INUSE) == 0) {
746 #ifdef TCB_CLONE_THREAD
747 tcp->nclone_threads = tcp->nclone_detached = 0;
748 tcp->nclone_waiting = 0;
750 tcp->flags = TCB_INUSE | TCB_STARTUP;
751 tcp->outf = outf; /* Initialise to current out file */
752 tcp->stime.tv_sec = 0;
753 tcp->stime.tv_usec = 0;
764 proc_open(tcp, attaching)
776 #ifndef HAVE_POLLABLE_PROCFS
780 #ifdef HAVE_MP_PROCFS
781 /* Open the process pseudo-files in /proc. */
782 sprintf(proc, "/proc/%d/ctl", tcp->pid);
783 if ((tcp->pfd = open(proc, O_WRONLY|O_EXCL)) < 0) {
784 perror("strace: open(\"/proc/...\", ...)");
787 if ((arg = fcntl(tcp->pfd, F_GETFD)) < 0) {
791 if (fcntl(tcp->pfd, F_SETFD, arg|FD_CLOEXEC) < 0) {
795 sprintf(proc, "/proc/%d/status", tcp->pid);
796 if ((tcp->pfd_stat = open(proc, O_RDONLY|O_EXCL)) < 0) {
797 perror("strace: open(\"/proc/...\", ...)");
800 if ((arg = fcntl(tcp->pfd_stat, F_GETFD)) < 0) {
804 if (fcntl(tcp->pfd_stat, F_SETFD, arg|FD_CLOEXEC) < 0) {
808 sprintf(proc, "/proc/%d/as", tcp->pid);
809 if ((tcp->pfd_as = open(proc, O_RDONLY|O_EXCL)) < 0) {
810 perror("strace: open(\"/proc/...\", ...)");
813 if ((arg = fcntl(tcp->pfd_as, F_GETFD)) < 0) {
817 if (fcntl(tcp->pfd_as, F_SETFD, arg|FD_CLOEXEC) < 0) {
822 /* Open the process pseudo-file in /proc. */
824 sprintf(proc, "/proc/%d", tcp->pid);
825 if ((tcp->pfd = open(proc, O_RDWR|O_EXCL)) < 0) {
827 sprintf(proc, "/proc/%d/mem", tcp->pid);
828 if ((tcp->pfd = open(proc, O_RDWR)) < 0) {
830 perror("strace: open(\"/proc/...\", ...)");
833 if ((arg = fcntl(tcp->pfd, F_GETFD)) < 0) {
837 if (fcntl(tcp->pfd, F_SETFD, arg|FD_CLOEXEC) < 0) {
843 sprintf(proc, "/proc/%d/regs", tcp->pid);
844 if ((tcp->pfd_reg = open(proc, O_RDONLY)) < 0) {
845 perror("strace: open(\"/proc/.../regs\", ...)");
849 sprintf(proc, "/proc/%d/status", tcp->pid);
850 if ((tcp->pfd_status = open(proc, O_RDONLY)) < 0) {
851 perror("strace: open(\"/proc/.../status\", ...)");
855 tcp->pfd_status = -1;
860 * Wait for the child to pause. Because of a race
861 * condition we have to poll for the event.
864 if (IOCTL_STATUS (tcp) < 0) {
865 perror("strace: PIOCSTATUS");
868 if (tcp->status.PR_FLAGS & PR_ASLEEP)
873 /* Stop the process so that we own the stop. */
874 if (IOCTL(tcp->pfd, PIOCSTOP, (char *)NULL) < 0) {
875 perror("strace: PIOCSTOP");
880 /* Set Run-on-Last-Close. */
882 if (IOCTL(tcp->pfd, PIOCSET, &arg) < 0) {
883 perror("PIOCSET PR_RLC");
886 /* Set or Reset Inherit-on-Fork. */
888 if (IOCTL(tcp->pfd, followfork ? PIOCSET : PIOCRESET, &arg) < 0) {
889 perror("PIOC{SET,RESET} PR_FORK");
894 if (ioctl(tcp->pfd, PIOCSRLC) < 0) {
898 if (ioctl(tcp->pfd, followfork ? PIOCSFORK : PIOCRFORK) < 0) {
899 perror("PIOC{S,R}FORK");
903 /* just unset the PF_LINGER flag for the Run-on-Last-Close. */
904 if (ioctl(tcp->pfd, PIOCGFL, &arg) < 0) {
909 if (ioctl(tcp->pfd, PIOCSFL, arg) < 0) {
914 #endif /* !PIOCSET */
916 /* Enable all syscall entries we care about. */
917 premptyset(&syscalls);
918 for (i = 1; i < MAX_QUALS; ++i) {
919 if (i > (sizeof syscalls) * CHAR_BIT) break;
920 if (qual_flags [i] & QUAL_TRACE) praddset (&syscalls, i);
922 praddset (&syscalls, SYS_execve);
924 praddset (&syscalls, SYS_fork);
926 praddset (&syscalls, SYS_forkall);
929 praddset (&syscalls, SYS_fork1);
932 praddset (&syscalls, SYS_rfork1);
935 praddset (&syscalls, SYS_rforkall);
938 if (IOCTL(tcp->pfd, PIOCSENTRY, &syscalls) < 0) {
939 perror("PIOCSENTRY");
942 /* Enable the syscall exits. */
943 if (IOCTL(tcp->pfd, PIOCSEXIT, &syscalls) < 0) {
947 /* Enable signals we care about. */
948 premptyset(&signals);
949 for (i = 1; i < MAX_QUALS; ++i) {
950 if (i > (sizeof signals) * CHAR_BIT) break;
951 if (qual_flags [i] & QUAL_SIGNAL) praddset (&signals, i);
953 if (IOCTL(tcp->pfd, PIOCSTRACE, &signals) < 0) {
954 perror("PIOCSTRACE");
957 /* Enable faults we care about */
959 for (i = 1; i < MAX_QUALS; ++i) {
960 if (i > (sizeof faults) * CHAR_BIT) break;
961 if (qual_flags [i] & QUAL_FAULT) praddset (&faults, i);
963 if (IOCTL(tcp->pfd, PIOCSFAULT, &faults) < 0) {
964 perror("PIOCSFAULT");
968 /* set events flags. */
969 arg = S_SIG | S_SCE | S_SCX ;
970 if(ioctl(tcp->pfd, PIOCBIS, arg) < 0) {
978 * The SGI PRSABORT doesn't work for pause() so
979 * we send it a caught signal to wake it up.
981 kill(tcp->pid, SIGINT);
984 /* The child is in a pause(), abort it. */
986 if (IOCTL (tcp->pfd, PIOCRUN, &arg) < 0) {
993 /* wake up the child if it received the SIGSTOP */
994 kill(tcp->pid, SIGCONT);
997 /* Wait for the child to do something. */
998 if (IOCTL_WSTOP (tcp) < 0) {
1002 if (tcp->status.PR_WHY == PR_SYSENTRY) {
1003 tcp->flags &= ~TCB_INSYSCALL;
1005 if (known_scno(tcp) == SYS_execve)
1008 /* Set it running: maybe execve will be next. */
1011 if (IOCTL(tcp->pfd, PIOCRUN, &arg) < 0) {
1013 if (IOCTL(tcp->pfd, PIOCRUN, 0) < 0) {
1014 #endif /* FREEBSD */
1019 /* handle the case where we "opened" the child before
1020 it did the kill -STOP */
1021 if (tcp->status.PR_WHY == PR_SIGNALLED &&
1022 tcp->status.PR_WHAT == SIGSTOP)
1023 kill(tcp->pid, SIGCONT);
1030 if (attaching < 2) {
1031 /* We are attaching to an already running process.
1032 * Try to figure out the state of the process in syscalls,
1033 * to handle the first event well.
1034 * This is done by having a look at the "wchan" property of the
1035 * process, which tells where it is stopped (if it is). */
1037 char wchan[20]; /* should be enough */
1039 sprintf(proc, "/proc/%d/status", tcp->pid);
1040 status = fopen(proc, "r");
1042 (fscanf(status, "%*s %*d %*d %*d %*d %*d,%*d %*s %*d,%*d"
1043 "%*d,%*d %*d,%*d %19s", wchan) == 1) &&
1044 strcmp(wchan, "nochan") && strcmp(wchan, "spread") &&
1045 strcmp(wchan, "stopevent")) {
1046 /* The process is asleep in the middle of a syscall.
1047 Fake the syscall entry event */
1048 tcp->flags &= ~(TCB_INSYSCALL|TCB_STARTUP);
1049 tcp->status.PR_WHY = PR_SYSENTRY;
1054 } /* otherwise it's a fork being followed */
1056 #endif /* FREEBSD */
1057 #ifndef HAVE_POLLABLE_PROCFS
1058 if (proc_poll_pipe[0] != -1)
1059 proc_poller(tcp->pfd);
1060 else if (nprocs > 1) {
1062 proc_poller(last_pfd);
1063 proc_poller(tcp->pfd);
1065 last_pfd = tcp->pfd;
1066 #endif /* !HAVE_POLLABLE_PROCFS */
1070 #endif /* USE_PROCFS */
1079 for (i = 0; i < tcbtabsize; i++) {
1081 if (pid && tcp->pid != pid)
1083 if (tcp->flags & TCB_INUSE)
1097 for (i = 0; i < tcbtabsize; i++) {
1098 struct tcb *tcp = tcbtab[i];
1099 if (tcp->pfd != pfd)
1101 if (tcp->flags & TCB_INUSE)
1107 #endif /* USE_PROCFS */
1115 #ifdef TCB_CLONE_THREAD
1116 if (tcp->nclone_threads > 0) {
1117 /* There are other threads left in this process, but this
1118 is the one whose PID represents the whole process.
1119 We need to keep this record around as a zombie until
1120 all the threads die. */
1121 tcp->flags |= TCB_EXITING;
1128 if (tcp->parent != NULL) {
1129 tcp->parent->nchildren--;
1130 #ifdef TCB_CLONE_THREAD
1131 if (tcp->flags & TCB_CLONE_DETACHED)
1132 tcp->parent->nclone_detached--;
1133 if (tcp->flags & TCB_CLONE_THREAD)
1134 tcp->parent->nclone_threads--;
1136 #ifdef TCB_CLONE_DETACHED
1137 if (!(tcp->flags & TCB_CLONE_DETACHED))
1139 tcp->parent->nzombies++;
1144 if (tcp->pfd != -1) {
1148 if (tcp->pfd_reg != -1) {
1149 close(tcp->pfd_reg);
1152 if (tcp->pfd_status != -1) {
1153 close(tcp->pfd_status);
1154 tcp->pfd_status = -1;
1156 #endif /* !FREEBSD */
1158 rebuild_pollv(); /* Note, flags needs to be cleared by now. */
1162 if (outfname && followfork > 1 && tcp->outf)
1177 if (!(tcp->flags & TCB_SUSPENDED)) {
1178 fprintf(stderr, "PANIC: pid %u not suspended\n", tcp->pid);
1181 tcp->flags &= ~TCB_SUSPENDED;
1182 #ifdef TCB_CLONE_THREAD
1183 if (tcp->flags & TCB_CLONE_THREAD)
1184 tcp->parent->nclone_waiting--;
1187 if (ptrace(PTRACE_SYSCALL, tcp->pid, (char *) 1, 0) < 0) {
1188 perror("resume: ptrace(PTRACE_SYSCALL, ...)");
1193 fprintf(stderr, "Process %u resumed\n", tcp->pid);
1197 #endif /* !USE_PROCFS */
1199 /* detach traced process; continue with sig */
1208 int status, resumed;
1211 if (tcp->flags & TCB_BPTSET)
1216 * Linux wrongly insists the child be stopped
1217 * before detaching. Arghh. We go through hoops
1218 * to make a clean break of things.
1221 #undef PTRACE_DETACH
1222 #define PTRACE_DETACH PTRACE_SUNDETACH
1224 if ((error = ptrace(PTRACE_DETACH, tcp->pid, (char *) 1, sig)) == 0) {
1225 /* On a clear day, you can see forever. */
1227 else if (errno != ESRCH) {
1228 /* Shouldn't happen. */
1229 perror("detach: ptrace(PTRACE_DETACH, ...)");
1231 else if (kill(tcp->pid, 0) < 0) {
1233 perror("detach: checking sanity");
1235 else if (kill(tcp->pid, SIGSTOP) < 0) {
1237 perror("detach: stopping child");
1242 if (wait4(tcp->pid, &status, __WALL, NULL) < 0) {
1243 if (errno == ECHILD) /* Already gone. */
1245 if (errno != EINVAL) {
1246 perror("detach: waiting");
1250 /* No __WALL here. */
1251 if (waitpid(tcp->pid, &status, 0) < 0) {
1252 if (errno != ECHILD) {
1253 perror("detach: waiting");
1257 /* If no processes, try clones. */
1258 if (wait4(tcp->pid, &status, __WCLONE,
1260 if (errno != ECHILD)
1261 perror("detach: waiting");
1264 #endif /* __WCLONE */
1269 if (!WIFSTOPPED(status)) {
1270 /* Au revoir, mon ami. */
1273 if (WSTOPSIG(status) == SIGSTOP) {
1274 if ((error = ptrace(PTRACE_DETACH,
1275 tcp->pid, (char *) 1, sig)) < 0) {
1277 perror("detach: ptrace(PTRACE_DETACH, ...)");
1278 /* I died trying. */
1282 if ((error = ptrace(PTRACE_CONT, tcp->pid, (char *) 1,
1283 WSTOPSIG(status) == SIGTRAP ?
1284 0 : WSTOPSIG(status))) < 0) {
1286 perror("detach: ptrace(PTRACE_CONT, ...)");
1294 /* PTRACE_DETACH won't respect `sig' argument, so we post it here. */
1295 if (sig && kill(tcp->pid, sig) < 0)
1296 perror("detach: kill");
1298 if ((error = ptrace(PTRACE_DETACH, tcp->pid, (char *) 1, sig)) < 0)
1299 perror("detach: ptrace(PTRACE_DETACH, ...)");
1305 /* XXX This won't always be quite right (but it never was).
1306 A waiter with argument 0 or < -1 is waiting for any pid in
1307 a particular pgrp, which this child might or might not be
1308 in. The waiter will only wake up if it's argument is -1
1309 or if it's waiting for tcp->pid's pgrp. It makes a
1310 difference to wake up a waiter when there might be more
1311 traced children, because it could get a false ECHILD
1312 error. OTOH, if this was the last child in the pgrp, then
1313 it ought to wake up and get ECHILD. We would have to
1314 search the system for all pid's in the pgrp to be sure.
1316 && (t->waitpid == -1 ||
1317 (t->waitpid == 0 && getpgid (tcp->pid) == getpgid (t->pid))
1318 || (t->waitpid < 0 && t->waitpid == -getpid (t->pid)))
1322 (tcp->parent->flags & TCB_SUSPENDED) &&
1323 (tcp->parent->waitpid <= 0 || tcp->parent->waitpid == tcp->pid)) {
1324 error = resume(tcp->parent);
1327 #ifdef TCB_CLONE_THREAD
1328 if (tcp->parent && tcp->parent->nclone_waiting > 0) {
1329 /* Some other threads of our parent are waiting too. */
1332 /* Resume all the threads that were waiting for this PID. */
1333 for (i = 0; i < tcbtabsize; i++) {
1334 struct tcb *t = tcbtab[i];
1335 if (t->parent == tcp->parent && t != tcp
1336 && ((t->flags & (TCB_CLONE_THREAD|TCB_SUSPENDED))
1337 == (TCB_CLONE_THREAD|TCB_SUSPENDED))
1338 && t->waitpid == tcp->pid) {
1339 error |= resume (t);
1344 /* Noone was waiting for this PID in particular,
1345 so now we might need to resume some wildcarders. */
1346 for (i = 0; i < tcbtabsize; i++) {
1347 struct tcb *t = tcbtab[i];
1348 if (t->parent == tcp->parent && t != tcp
1350 & (TCB_CLONE_THREAD|TCB_SUSPENDED))
1351 == (TCB_CLONE_THREAD|TCB_SUSPENDED))
1354 error |= resume (t);
1361 #endif /* !USE_PROCFS */
1364 fprintf(stderr, "Process %u detached\n", tcp->pid);
1379 while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
1390 #endif /* USE_PROCFS */
1398 for (i = 0; i < tcbtabsize; i++) {
1400 if (!(tcp->flags & TCB_INUSE))
1404 "cleanup: looking at pid %u\n", tcp->pid);
1406 (!outfname || followfork < 2 || tcp_last == tcp)) {
1407 tprintf(" <unfinished ...>\n");
1410 if (tcp->flags & TCB_ATTACHED)
1413 kill(tcp->pid, SIGCONT);
1414 kill(tcp->pid, SIGTERM);
1428 #ifndef HAVE_STRERROR
1430 #if !HAVE_DECL_SYS_ERRLIST
1431 extern int sys_nerr;
1432 extern char *sys_errlist[];
1433 #endif /* HAVE_DECL_SYS_ERRLIST */
1439 static char buf[64];
1441 if (errno < 1 || errno >= sys_nerr) {
1442 sprintf(buf, "Unknown error %d", errno);
1445 return sys_errlist[errno];
1448 #endif /* HAVE_STERRROR */
1450 #ifndef HAVE_STRSIGNAL
1452 #if defined HAVE_SYS_SIGLIST && !defined HAVE_DECL_SYS_SIGLIST
1453 extern char *sys_siglist[];
1455 #if defined HAVE_SYS__SIGLIST && !defined HAVE_DECL__SYS_SIGLIST
1456 extern char *_sys_siglist[];
1463 static char buf[64];
1465 if (sig < 1 || sig >= NSIG) {
1466 sprintf(buf, "Unknown signal %d", sig);
1469 #ifdef HAVE__SYS_SIGLIST
1470 return _sys_siglist[sig];
1472 return sys_siglist[sig];
1476 #endif /* HAVE_STRSIGNAL */
1487 pollv = (struct pollfd *) malloc(nprocs * sizeof pollv[0]);
1488 if (pollv == NULL) {
1489 fprintf(stderr, "%s: out of memory\n", progname);
1493 for (i = j = 0; i < tcbtabsize; i++) {
1494 struct tcb *tcp = tcbtab[i];
1495 if (!(tcp->flags & TCB_INUSE))
1497 pollv[j].fd = tcp->pfd;
1498 pollv[j].events = POLLWANT;
1502 fprintf(stderr, "strace: proc miscount\n");
1507 #ifndef HAVE_POLLABLE_PROCFS
1515 if (pipe(proc_poll_pipe) < 0) {
1519 for (i = 0; i < 2; i++) {
1520 if ((arg = fcntl(proc_poll_pipe[i], F_GETFD)) < 0) {
1524 if (fcntl(proc_poll_pipe[i], F_SETFD, arg|FD_CLOEXEC) < 0) {
1532 proc_poll(pollv, nfds, timeout)
1533 struct pollfd *pollv;
1539 struct proc_pollfd pollinfo;
1541 if ((n = read(proc_poll_pipe[0], &pollinfo, sizeof(pollinfo))) < 0)
1543 if (n != sizeof(struct proc_pollfd)) {
1544 fprintf(stderr, "panic: short read: %d\n", n);
1547 for (i = 0; i < nprocs; i++) {
1548 if (pollv[i].fd == pollinfo.fd)
1549 pollv[i].revents = pollinfo.revents;
1551 pollv[i].revents = 0;
1553 poller_pid = pollinfo.pid;
1567 struct proc_pollfd pollinfo;
1568 struct sigaction sa;
1569 sigset_t blocked_set, empty_set;
1574 struct procfs_status pfs;
1575 #endif /* FREEBSD */
1587 sa.sa_handler = interactive ? SIG_DFL : SIG_IGN;
1589 sigemptyset(&sa.sa_mask);
1590 sigaction(SIGHUP, &sa, NULL);
1591 sigaction(SIGINT, &sa, NULL);
1592 sigaction(SIGQUIT, &sa, NULL);
1593 sigaction(SIGPIPE, &sa, NULL);
1594 sigaction(SIGTERM, &sa, NULL);
1595 sa.sa_handler = wakeup_handler;
1596 sigaction(SIGUSR1, &sa, NULL);
1597 sigemptyset(&blocked_set);
1598 sigaddset(&blocked_set, SIGUSR1);
1599 sigprocmask(SIG_BLOCK, &blocked_set, NULL);
1600 sigemptyset(&empty_set);
1602 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) {
1603 perror("getrlimit(RLIMIT_NOFILE, ...)");
1607 for (i = 0; i < n; i++) {
1608 if (i != pfd && i != proc_poll_pipe[1])
1613 pollinfo.pid = getpid();
1616 if (ioctl(pfd, PIOCWSTOP, NULL) < 0)
1618 if (ioctl(pfd, PIOCWSTOP, &pfs) < 0)
1619 #endif /* FREEBSD */
1625 pollinfo.revents = POLLERR;
1628 pollinfo.revents = POLLHUP;
1631 perror("proc_poller: PIOCWSTOP");
1633 write(proc_poll_pipe[1], &pollinfo, sizeof(pollinfo));
1636 pollinfo.revents = POLLWANT;
1637 write(proc_poll_pipe[1], &pollinfo, sizeof(pollinfo));
1638 sigsuspend(&empty_set);
1642 #endif /* !HAVE_POLLABLE_PROCFS */
1652 if (followfork < 2 &&
1653 last < nprocs && (pollv[last].revents & POLLWANT)) {
1655 * The previous process is ready to run again. We'll
1656 * let it do so if it is currently in a syscall. This
1657 * heuristic improves the readability of the trace.
1659 tcp = pfd2tcb(pollv[last].fd);
1660 if (tcp && (tcp->flags & TCB_INSYSCALL))
1661 return pollv[last].fd;
1664 for (i = 0; i < nprocs; i++) {
1665 /* Let competing children run round robin. */
1666 j = (i + last + 1) % nprocs;
1667 if (pollv[j].revents & (POLLHUP | POLLERR)) {
1668 tcp = pfd2tcb(pollv[j].fd);
1670 fprintf(stderr, "strace: lost proc\n");
1676 if (pollv[j].revents & POLLWANT) {
1681 fprintf(stderr, "strace: nothing ready\n");
1689 struct tcb *in_syscall = NULL;
1694 int ioctl_result = 0, ioctl_errno = 0;
1699 sigprocmask(SIG_SETMASK, &empty_set, NULL);
1706 #ifndef HAVE_POLLABLE_PROCFS
1707 if (proc_poll_pipe[0] == -1) {
1716 #ifndef HAVE_POLLABLE_PROCFS
1718 /* fall through ... */
1719 #endif /* !HAVE_POLLABLE_PROCFS */
1721 #ifdef HAVE_POLLABLE_PROCFS
1723 /* On some systems (e.g. UnixWare) we get too much ugly
1724 "unfinished..." stuff when multiple proceses are in
1725 syscalls. Here's a nasty hack */
1732 pv.events = POLLWANT;
1733 if ((what = poll (&pv, 1, 1)) < 0) {
1738 else if (what == 1 && pv.revents & POLLWANT) {
1744 if (poll(pollv, nprocs, INFTIM) < 0) {
1749 #else /* !HAVE_POLLABLE_PROCFS */
1750 if (proc_poll(pollv, nprocs, INFTIM) < 0) {
1755 #endif /* !HAVE_POLLABLE_PROCFS */
1762 /* Look up `pfd' in our table. */
1763 if ((tcp = pfd2tcb(pfd)) == NULL) {
1764 fprintf(stderr, "unknown pfd: %u\n", pfd);
1770 /* Get the status of the process. */
1773 ioctl_result = IOCTL_WSTOP (tcp);
1775 /* Thanks to some scheduling mystery, the first poller
1776 sometimes waits for the already processed end of fork
1777 event. Doing a non blocking poll here solves the problem. */
1778 if (proc_poll_pipe[0] != -1)
1779 ioctl_result = IOCTL_STATUS (tcp);
1781 ioctl_result = IOCTL_WSTOP (tcp);
1782 #endif /* FREEBSD */
1783 ioctl_errno = errno;
1784 #ifndef HAVE_POLLABLE_PROCFS
1785 if (proc_poll_pipe[0] != -1) {
1786 if (ioctl_result < 0)
1787 kill(poller_pid, SIGKILL);
1789 kill(poller_pid, SIGUSR1);
1791 #endif /* !HAVE_POLLABLE_PROCFS */
1797 sigprocmask(SIG_BLOCK, &blocked_set, NULL);
1799 if (ioctl_result < 0) {
1800 /* Find out what happened if it failed. */
1801 switch (ioctl_errno) {
1812 perror("PIOCWSTOP");
1818 if ((tcp->flags & TCB_STARTUP) && (tcp->status.PR_WHY == PR_SYSEXIT)) {
1819 /* discard first event for a syscall we never entered */
1820 IOCTL (tcp->pfd, PIOCRUN, 0);
1825 /* clear the just started flag */
1826 tcp->flags &= ~TCB_STARTUP;
1828 /* set current output file */
1832 struct timeval stime;
1837 if ((len = pread(tcp->pfd_status, buf, sizeof(buf) - 1, 0)) > 0) {
1840 "%*s %*d %*d %*d %*d %*d,%*d %*s %*d,%*d %*d,%*d %ld,%ld",
1841 &stime.tv_sec, &stime.tv_usec);
1843 stime.tv_sec = stime.tv_usec = 0;
1844 #else /* !FREEBSD */
1845 stime.tv_sec = tcp->status.pr_stime.tv_sec;
1846 stime.tv_usec = tcp->status.pr_stime.tv_nsec/1000;
1847 #endif /* !FREEBSD */
1848 tv_sub(&tcp->dtime, &stime, &tcp->stime);
1851 what = tcp->status.PR_WHAT;
1852 switch (tcp->status.PR_WHY) {
1855 if (tcp->status.PR_FLAGS & PR_ASLEEP) {
1856 tcp->status.PR_WHY = PR_SYSENTRY;
1857 if (trace_syscall(tcp) < 0) {
1858 fprintf(stderr, "syscall trouble\n");
1863 #endif /* !FREEBSD */
1869 if (trace_syscall(tcp) < 0) {
1870 fprintf(stderr, "syscall trouble\n");
1875 if (!cflag && (qual_flags[what] & QUAL_SIGNAL)) {
1877 tprintf("--- %s (%s) ---",
1878 signame(what), strsignal(what));
1881 if (tcp->status.PR_INFO.si_signo == what) {
1883 tprintf(" siginfo=");
1884 printsiginfo(&tcp->status.PR_INFO, 1);
1891 if (!cflag && (qual_flags[what] & QUAL_FAULT)) {
1893 tprintf("=== FAULT %d ===", what);
1898 case 0: /* handle case we polled for nothing */
1902 fprintf(stderr, "odd stop %d\n", tcp->status.PR_WHY);
1908 if (IOCTL (tcp->pfd, PIOCRUN, &arg) < 0) {
1910 if (IOCTL (tcp->pfd, PIOCRUN, 0) < 0) {
1919 #else /* !USE_PROCFS */
1921 #ifdef TCB_GROUP_EXITING
1922 /* Handle an exit detach or death signal that is taking all the
1923 related clone threads with it. This is called in three circumstances:
1924 SIG == -1 TCP has already died (TCB_ATTACHED is clear, strace is parent).
1925 SIG == 0 Continuing TCP will perform an exit_group syscall.
1926 SIG == other Continuing TCP with SIG will kill the process.
1929 handle_group_exit(struct tcb *tcp, int sig)
1931 /* We need to locate our records of all the clone threads
1932 related to TCP, either its children or siblings. */
1933 struct tcb *leader = ((tcp->flags & TCB_CLONE_THREAD)
1935 : tcp->nclone_detached > 0
1939 if (leader != NULL && leader != tcp &&
1940 !(leader->flags & TCB_GROUP_EXITING))
1942 "PANIC: handle_group_exit: %d leader %d\n",
1943 tcp->pid, leader ? leader->pid : -1);
1944 droptcb(tcp); /* Already died. */
1947 if (tcp->flags & TCB_ATTACHED) {
1948 if (leader != NULL && leader != tcp) {
1949 if (leader->flags & TCB_ATTACHED) {
1950 /* We need to detach the leader so
1951 that the process death will be
1952 reported to its real parent.
1953 But we kill it first to prevent
1954 it doing anything before we kill
1955 the whole process in a moment.
1956 We can use PTRACE_KILL on a
1957 thread that's not already
1958 stopped. Then the value we pass
1959 in PTRACE_DETACH just sets the
1960 death signal reported to the
1962 ptrace(PTRACE_KILL, leader->pid, 0, 0);
1965 " [%d exit %d kills %d]\n",
1966 tcp->pid, sig, leader->pid);
1967 detach(leader, sig);
1970 leader->flags |= TCB_GROUP_EXITING;
1974 else if (ptrace(PTRACE_CONT, tcp->pid, (char *) 1, sig) < 0) {
1975 perror("strace: ptrace(PTRACE_CONT, ...)");
1981 leader->flags |= TCB_GROUP_EXITING;
1982 if (leader != NULL && leader != tcp)
1984 /* The leader will report to us as parent now,
1985 and then we'll get to the SIG==-1 case. */
2004 static int wait4_options = __WALL;
2008 while (nprocs != 0) {
2010 sigprocmask(SIG_SETMASK, &empty_set, NULL);
2013 pid = wait4(-1, &status, wait4_options, cflag ? &ru : NULL);
2014 if (pid < 0 && (wait4_options & __WALL) && errno == EINVAL) {
2015 /* this kernel does not support __WALL */
2016 wait4_options &= ~__WALL;
2018 pid = wait4(-1, &status, wait4_options,
2019 cflag ? &ru : NULL);
2021 if (pid < 0 && !(wait4_options & __WALL) && errno == ECHILD) {
2022 /* most likely a "cloned" process */
2023 pid = wait4(-1, &status, __WCLONE,
2024 cflag ? &ru : NULL);
2026 fprintf(stderr, "strace: clone wait4 "
2027 "failed: %s\n", strerror(errno));
2031 pid = wait4(-1, &status, 0, cflag ? &ru : NULL);
2035 pid = wait(&status);
2039 sigprocmask(SIG_BLOCK, &blocked_set, NULL);
2045 switch (wait_errno) {
2050 * We would like to verify this case
2051 * but sometimes a race in Solbourne's
2052 * version of SunOS sometimes reports
2053 * ECHILD before sending us SIGCHILD.
2058 fprintf(stderr, "strace: proc miscount\n");
2064 perror("strace: wait");
2069 fprintf(stderr, " [wait(%#x) = %u]\n", status, pid);
2071 /* Look up `pid' in our table. */
2072 if ((tcp = pid2tcb(pid)) == NULL) {
2074 if (followfork || followvfork) {
2075 /* This is needed to go with the CLONE_PTRACE
2076 changes in process.c/util.c: we might see
2077 the child's initial trap before we see the
2078 parent return from the clone syscall.
2079 Leave the child suspended until the parent
2080 returns from its system call. Only then
2081 will we have the association of parent and
2082 child so that we know how to do clearbpt
2084 if ((tcp = alloctcb(pid)) == NULL) {
2085 fprintf(stderr, " [tcb table full]\n");
2086 kill(pid, SIGKILL); /* XXX */
2089 tcp->flags |= TCB_ATTACHED | TCB_SUSPENDED;
2093 Process %d attached (waiting for parent)\n",
2097 /* This can happen if a clone call used
2098 CLONE_PTRACE itself. */
2101 fprintf(stderr, "unknown pid: %u\n", pid);
2102 if (WIFSTOPPED(status))
2103 ptrace(PTRACE_CONT, pid, (char *) 1, 0);
2107 /* set current output file */
2111 tv_sub(&tcp->dtime, &ru.ru_stime, &tcp->stime);
2112 tcp->stime = ru.ru_stime;
2116 if (tcp->flags & TCB_SUSPENDED) {
2118 * Apparently, doing any ptrace() call on a stopped
2119 * process, provokes the kernel to report the process
2120 * status again on a subsequent wait(), even if the
2121 * process has not been actually restarted.
2122 * Since we have inspected the arguments of suspended
2123 * processes we end up here testing for this case.
2127 if (WIFSIGNALED(status)) {
2129 && (qual_flags[WTERMSIG(status)] & QUAL_SIGNAL)) {
2131 tprintf("+++ killed by %s %s+++",
2132 signame(WTERMSIG(status)),
2134 WCOREDUMP(status) ? "(core dumped) " :
2139 #ifdef TCB_GROUP_EXITING
2140 handle_group_exit(tcp, -1);
2146 if (WIFEXITED(status)) {
2148 fprintf(stderr, "pid %u exited\n", pid);
2149 if ((tcp->flags & TCB_ATTACHED)
2150 #ifdef TCB_GROUP_EXITING
2151 && !(tcp->parent && (tcp->parent->flags &
2156 "PANIC: attached pid %u exited\n",
2158 if (tcp == tcp_last) {
2159 if ((tcp->flags & (TCB_INSYSCALL|TCB_REPRINT))
2161 tprintf(" <unfinished ... exit status %d>\n",
2162 WEXITSTATUS(status));
2165 #ifdef TCB_GROUP_EXITING
2166 handle_group_exit(tcp, -1);
2172 if (!WIFSTOPPED(status)) {
2173 fprintf(stderr, "PANIC: pid %u not stopped\n", pid);
2178 fprintf(stderr, "pid %u stopped, [%s]\n",
2179 pid, signame(WSTOPSIG(status)));
2181 if (tcp->flags & TCB_STARTUP) {
2183 * This flag is there to keep us in sync.
2184 * Next time this process stops it should
2185 * really be entering a system call.
2187 tcp->flags &= ~TCB_STARTUP;
2188 if (tcp->flags & TCB_ATTACHED) {
2190 * Interestingly, the process may stop
2191 * with STOPSIG equal to some other signal
2192 * than SIGSTOP if we happend to attach
2193 * just before the process takes a signal.
2195 if (!WIFSTOPPED(status)) {
2197 "pid %u not stopped\n", pid);
2198 detach(tcp, WSTOPSIG(status));
2204 /* A child of us stopped at exec */
2205 if (WSTOPSIG(status) == SIGTRAP && followvfork)
2209 if (tcp->flags & TCB_BPTSET) {
2210 if (clearbpt(tcp) < 0) /* Pretty fatal */ {
2219 if (WSTOPSIG(status) != SIGTRAP) {
2220 if (WSTOPSIG(status) == SIGSTOP &&
2221 (tcp->flags & TCB_SIGTRAPPED)) {
2223 * Trapped attempt to block SIGTRAP
2224 * Hope we are back in control now.
2226 tcp->flags &= ~(TCB_INSYSCALL | TCB_SIGTRAPPED);
2227 if (ptrace(PTRACE_SYSCALL,
2228 pid, (char *) 1, 0) < 0) {
2229 perror("trace: ptrace(PTRACE_SYSCALL, ...)");
2236 && (qual_flags[WSTOPSIG(status)] & QUAL_SIGNAL)) {
2237 unsigned long addr = 0, pc = 0;
2238 #ifdef PT_GETSIGINFO
2243 upeek(pid, PT_CR_IPSR, &psr);
2244 upeek(pid, PT_CR_IIP, &pc);
2246 pc += (psr >> PSR_RI) & 0x3;
2247 ptrace(PT_GETSIGINFO, pid, 0, (long) &si);
2248 addr = (unsigned long) si.si_addr;
2249 #elif defined PTRACE_GETSIGINFO
2250 if (WSTOPSIG(status) == SIGSEGV ||
2251 WSTOPSIG(status) == SIGBUS) {
2253 if (ptrace(PTRACE_GETSIGINFO, pid,
2255 addr = (unsigned long)
2260 tprintf("--- %s (%s) @ %lx (%lx) ---",
2261 signame(WSTOPSIG(status)),
2262 strsignal(WSTOPSIG(status)), pc, addr);
2265 if (((tcp->flags & TCB_ATTACHED) ||
2266 tcp->nclone_threads > 0) &&
2267 !sigishandled(tcp, WSTOPSIG(status))) {
2268 #ifdef TCB_GROUP_EXITING
2269 handle_group_exit(tcp, WSTOPSIG(status));
2271 detach(tcp, WSTOPSIG(status));
2275 if (ptrace(PTRACE_SYSCALL, pid, (char *) 1,
2276 WSTOPSIG(status)) < 0) {
2277 perror("trace: ptrace(PTRACE_SYSCALL, ...)");
2281 tcp->flags &= ~TCB_SUSPENDED;
2284 if (trace_syscall(tcp) < 0) {
2285 if (tcp->flags & TCB_ATTACHED)
2289 tcp->pid, (char *) 1, SIGTERM);
2294 if (tcp->flags & TCB_EXITING) {
2295 #ifdef TCB_GROUP_EXITING
2296 if (tcp->flags & TCB_GROUP_EXITING) {
2297 if (handle_group_exit(tcp, 0) < 0)
2302 if (tcp->flags & TCB_ATTACHED)
2304 else if (ptrace(PTRACE_CONT, pid, (char *) 1, 0) < 0) {
2305 perror("strace: ptrace(PTRACE_CONT, ...)");
2311 if (tcp->flags & TCB_SUSPENDED) {
2313 fprintf(stderr, "Process %u suspended\n", pid);
2317 if (ptrace(PTRACE_SYSCALL, pid, (char *) 1, 0) < 0) {
2318 perror("trace: ptrace(PTRACE_SYSCALL, ...)");
2326 #endif /* !USE_PROCFS */
2332 #define VA_START(a, b) va_start(a, b)
2334 #include <varargs.h>
2335 #define VA_START(a, b) va_start(a)
2340 tprintf(const char *fmt, ...)
2342 tprintf(fmt, va_alist)
2349 VA_START(args, fmt);
2351 int n = vfprintf(outf, fmt, args);
2352 if (n < 0 && outf != stderr)
2353 perror(outfname == NULL
2354 ? "<writing to pipe>" : outfname);
2366 if (tcp_last && (!outfname || followfork < 2 || tcp_last == tcp)) {
2367 tcp_last->flags |= TCB_REPRINT;
2368 tprintf(" <unfinished ...>\n");
2371 if ((followfork == 1 || pflag_seen > 1) && outfname)
2372 tprintf("%-5d ", tcp->pid);
2373 else if (nprocs > 1 && !outfname)
2374 tprintf("[pid %5u] ", tcp->pid);
2376 char str[sizeof("HH:MM:SS")];
2377 struct timeval tv, dtv;
2378 static struct timeval otv;
2380 gettimeofday(&tv, NULL);
2382 if (otv.tv_sec == 0)
2384 tv_sub(&dtv, &tv, &otv);
2385 tprintf("%6ld.%06ld ",
2386 (long) dtv.tv_sec, (long) dtv.tv_usec);
2389 else if (tflag > 2) {
2390 tprintf("%ld.%06ld ",
2391 (long) tv.tv_sec, (long) tv.tv_usec);
2394 time_t local = tv.tv_sec;
2395 strftime(str, sizeof(str), "%T", localtime(&local));
2397 tprintf("%s.%06ld ", str, (long) tv.tv_usec);
2399 tprintf("%s ", str);
2411 tprintf("%*s", col - curcol, "");
2422 #ifdef HAVE_MP_PROCFS
2424 int mp_ioctl (int fd, int cmd, void *arg, int size) {
2426 struct iovec iov[2];
2429 iov[0].iov_base = &cmd;
2430 iov[0].iov_len = sizeof cmd;
2433 iov[1].iov_base = arg;
2434 iov[1].iov_len = size;
2437 return writev (fd, iov, n);