1779 lines
37 KiB
C
1779 lines
37 KiB
C
/*
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* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
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* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
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* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
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* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id$
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*/
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#include <sys/types.h>
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#include "defs.h"
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#include <signal.h>
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#include <errno.h>
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#include <sys/param.h>
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#include <fcntl.h>
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#include <sys/resource.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <pwd.h>
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#include <grp.h>
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#include <string.h>
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#ifdef SVR4
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#include <sys/stropts.h>
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#include <poll.h>
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#ifdef HAVE_MP_PROCFS
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#include <sys/uio.h>
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#endif
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#endif
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int debug = 0, followfork = 0, followvfork = 0, interactive = 0;
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int rflag = 0, tflag = 0, dtime = 0, cflag = 0;
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int iflag = 0, xflag = 0, qflag = 0;
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int pflag_seen = 0;
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char *username = NULL;
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uid_t run_uid;
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gid_t run_gid;
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int acolumn = DEFAULT_ACOLUMN;
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int max_strlen = DEFAULT_STRLEN;
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char *outfname = NULL;
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FILE *outf;
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struct tcb tcbtab[MAX_PROCS];
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int nprocs;
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char *progname;
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extern char version[];
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extern char **environ;
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static struct tcb *pid2tcb P((int pid));
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static int trace P((void));
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static void cleanup P((void));
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static void interrupt P((int sig));
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static sigset_t empty_set, blocked_set;
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#ifdef HAVE_SIG_ATOMIC_T
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static volatile sig_atomic_t interrupted;
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#else /* !HAVE_SIG_ATOMIC_T */
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#ifdef __STDC__
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static volatile int interrupted;
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#else /* !__STDC__ */
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static int interrupted;
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#endif /* !__STDC__ */
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#endif /* !HAVE_SIG_ATOMIC_T */
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#ifdef SVR4
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static struct tcb *pfd2tcb P((int pfd));
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static void reaper P((int sig));
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static void rebuild_pollv P((void));
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struct pollfd pollv[MAX_PROCS];
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#ifndef HAVE_POLLABLE_PROCFS
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static void proc_poll_open P((void));
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static void proc_poller P((int pfd));
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struct proc_pollfd {
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int fd;
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int revents;
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int pid;
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};
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static int poller_pid;
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static int proc_poll_pipe[2] = { -1, -1 };
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#endif /* !HAVE_POLLABLE_PROCFS */
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#ifdef HAVE_MP_PROCFS
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#define POLLWANT POLLWRNORM
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#else
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#define POLLWANT POLLPRI
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#endif
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#endif /* SVR4 */
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static void
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usage(ofp, exitval)
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FILE *ofp;
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int exitval;
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{
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fprintf(ofp, "\
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usage: strace [-dffhiqrtttTvVxx] [-a column] [-e expr] ... [-o file]\n\
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[-p pid] ... [-s strsize] [-u username] [command [arg ...]]\n\
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or: strace -c [-e expr] ... [-O overhead] [-S sortby] [command [arg ...]]\n\
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-c -- count time, calls, and errors for each syscall and report summary\n\
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-f -- follow forks, -ff -- with output into separate files\n\
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-F -- attempt to follow vforks, -h -- print help message\n\
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-i -- print instruction pointer at time of syscall\n\
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-q -- suppress messages about attaching, detaching, etc.\n\
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-r -- print relative timestamp, -t -- absolute timestamp, -tt -- with usecs\n\
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-T -- print time spent in each syscall, -V -- print version\n\
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-v -- verbose mode: print unabbreviated argv, stat, termio[s], etc. args\n\
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-x -- print non-ascii strings in hex, -xx -- print all strings in hex\n\
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-a column -- alignment COLUMN for printing syscall results (default %d)\n\
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-e expr -- a qualifying expression: option=[!]all or option=[!]val1[,val2]...\n\
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options: trace, abbrev, verbose, raw, signal, read, or write\n\
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-o file -- send trace output to FILE instead of stderr\n\
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-O overhead -- set overhead for tracing syscalls to OVERHEAD usecs\n\
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-p pid -- trace process with process id PID, may be repeated\n\
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-s strsize -- limit length of print strings to STRSIZE chars (default %d)\n\
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-S sortby -- sort syscall counts by: time, calls, name, nothing (default %s)\n\
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-u username -- run command as username handling setuid and/or setgid\n\
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", DEFAULT_ACOLUMN, DEFAULT_STRLEN, DEFAULT_SORTBY);
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exit(exitval);
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}
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#ifdef SVR4
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#ifdef MIPS
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void
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foobar()
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{
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}
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#endif /* MIPS */
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#endif /* SVR4 */
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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extern int optind;
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extern char *optarg;
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struct tcb *tcp;
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int c, pid = 0;
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struct sigaction sa;
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static char buf[BUFSIZ];
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progname = argv[0];
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outf = stderr;
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interactive = 1;
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qualify("trace=all");
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qualify("abbrev=all");
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qualify("verbose=all");
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qualify("signal=all");
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set_sortby(DEFAULT_SORTBY);
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set_personality(DEFAULT_PERSONALITY);
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while ((c = getopt(argc, argv,
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"+cdfFhiqrtTvVxa:e:o:O:p:s:S:u:")) != EOF) {
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switch (c) {
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case 'c':
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cflag++;
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dtime++;
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break;
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case 'd':
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debug++;
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break;
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case 'f':
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followfork++;
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break;
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case 'F':
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followvfork++;
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break;
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case 'h':
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usage(stdout, 0);
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break;
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case 'i':
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iflag++;
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break;
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case 'q':
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qflag++;
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break;
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case 'r':
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rflag++;
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tflag++;
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break;
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case 't':
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tflag++;
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break;
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case 'T':
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dtime++;
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break;
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case 'x':
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xflag++;
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break;
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case 'v':
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qualify("abbrev=none");
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break;
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case 'V':
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printf("%s\n", version);
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exit(0);
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break;
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case 'a':
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acolumn = atoi(optarg);
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break;
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case 'e':
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qualify(optarg);
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break;
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case 'o':
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outfname = strdup(optarg);
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break;
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case 'O':
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set_overhead(atoi(optarg));
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break;
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case 'p':
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if ((pid = atoi(optarg)) == 0) {
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fprintf(stderr, "%s: Invalid process id: %s\n",
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progname, optarg);
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break;
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}
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if (pid == getpid()) {
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fprintf(stderr, "%s: I'm sorry, I can't let you do that, Dave.\n", progname);
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break;
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}
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if ((tcp = alloctcb(pid)) == NULL) {
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fprintf(stderr, "%s: tcb table full, please recompile strace\n",
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progname);
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exit(1);
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}
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tcp->flags |= TCB_ATTACHED;
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pflag_seen++;
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break;
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case 's':
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max_strlen = atoi(optarg);
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break;
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case 'S':
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set_sortby(optarg);
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break;
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case 'u':
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username = strdup(optarg);
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break;
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default:
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usage(stderr, 1);
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break;
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}
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}
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/* See if they want to run as another user. */
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if (username != NULL) {
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struct passwd *pent;
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if (getuid() != 0 || geteuid() != 0) {
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fprintf(stderr,
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"%s: you must be root to use the -u option\n",
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progname);
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exit(1);
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}
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if ((pent = getpwnam(username)) == NULL) {
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fprintf(stderr, "%s: cannot find user `%s'\n",
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progname, optarg);
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exit(1);
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}
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run_uid = pent->pw_uid;
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run_gid = pent->pw_gid;
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}
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else {
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run_uid = getuid();
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run_gid = getgid();
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}
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#ifndef SVR4
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setreuid(geteuid(), getuid());
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#endif
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/* See if they want to pipe the output. */
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if (outfname && (outfname[0] == '|' || outfname[0] == '!')) {
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if ((outf = popen(outfname + 1, "w")) == NULL) {
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fprintf(stderr, "%s: can't popen '%s': %s\n",
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progname, outfname + 1, strerror(errno));
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exit(1);
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}
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free(outfname);
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outfname = NULL;
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}
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/* Check if they want to redirect the output. */
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if (outfname) {
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if ((outf = fopen(outfname, "w")) == NULL) {
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fprintf(stderr, "%s: can't fopen '%s': %s\n",
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progname, outfname, strerror(errno));
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exit(1);
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}
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}
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#ifndef SVR4
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setreuid(geteuid(), getuid());
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#endif
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if (!outfname) {
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qflag = 1;
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setvbuf(outf, buf, _IOLBF, BUFSIZ);
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}
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else if (optind < argc)
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interactive = 0;
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else
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qflag = 1;
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for (c = 0, tcp = tcbtab; c < MAX_PROCS; c++, tcp++) {
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/* Reinitialize the output since it may have changed. */
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tcp->outf = outf;
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if (!(tcp->flags & TCB_INUSE) || !(tcp->flags & TCB_ATTACHED))
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continue;
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#ifdef SVR4
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if (proc_open(tcp, 1) < 0) {
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fprintf(stderr, "trouble opening proc file\n");
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droptcb(tcp);
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continue;
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}
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#else /* !SVR4 */
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if (ptrace(PTRACE_ATTACH, tcp->pid, (char *) 1, 0) < 0) {
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perror("attach: ptrace(PTRACE_ATTACH, ...)");
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droptcb(tcp);
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continue;
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}
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#endif /* !SVR4 */
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if (!qflag)
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fprintf(stderr,
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"Process %u attached - interrupt to quit\n",
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pid);
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}
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if (optind < argc) {
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struct stat statbuf;
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char *filename;
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char pathname[MAXPATHLEN];
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filename = argv[optind];
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if (strchr(filename, '/'))
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strcpy(pathname, filename);
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#ifdef USE_DEBUGGING_EXEC
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/*
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* Debuggers customarily check the current directory
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* first regardless of the path but doing that gives
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* security geeks a panic attack.
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*/
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else if (stat(filename, &statbuf) == 0)
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strcpy(pathname, filename);
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#endif /* USE_DEBUGGING_EXEC */
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else {
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char *path;
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int m, n, len;
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for (path = getenv("PATH"); path && *path; path += m) {
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if (strchr(path, ':')) {
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n = strchr(path, ':') - path;
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m = n + 1;
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}
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else
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m = n = strlen(path);
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if (n == 0) {
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getcwd(pathname, MAXPATHLEN);
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len = strlen(pathname);
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}
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else {
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strncpy(pathname, path, n);
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len = n;
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}
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if (len && pathname[len - 1] != '/')
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pathname[len++] = '/';
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strcpy(pathname + len, filename);
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if (stat(pathname, &statbuf) == 0)
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break;
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}
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}
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if (stat(pathname, &statbuf) < 0) {
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fprintf(stderr, "%s: %s: command not found\n",
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progname, filename);
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exit(1);
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}
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switch (pid = fork()) {
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case -1:
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perror("strace: fork");
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cleanup();
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exit(1);
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break;
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case 0: {
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#ifdef SVR4
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if (outf != stderr) close (fileno (outf));
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#ifdef MIPS
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/* Kludge for SGI, see proc_open for details. */
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sa.sa_handler = foobar;
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sa.sa_flags = 0;
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sigemptyset(&sa.sa_mask);
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sigaction(SIGINT, &sa, NULL);
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#endif /* MIPS */
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pause();
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#else /* !SVR4 */
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if (outf!=stderr)
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close(outf);
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if (ptrace(PTRACE_TRACEME, 0, (char *) 1, 0) < 0) {
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perror("strace: ptrace(PTRACE_TRACEME, ...)");
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return -1;
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}
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if (debug)
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kill(getpid(), SIGSTOP);
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if (username != NULL || geteuid() == 0) {
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uid_t run_euid = run_uid;
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gid_t run_egid = run_gid;
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if (statbuf.st_mode & S_ISUID)
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run_euid = statbuf.st_uid;
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if (statbuf.st_mode & S_ISGID)
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run_egid = statbuf.st_gid;
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/*
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* It is important to set groups before we
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* lose privileges on setuid.
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*/
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if (username != NULL) {
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if (initgroups(username, run_gid) < 0) {
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perror("initgroups");
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exit(1);
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}
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if (setregid(run_gid, run_egid) < 0) {
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perror("setregid");
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exit(1);
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}
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if (setreuid(run_uid, run_euid) < 0) {
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perror("setreuid");
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exit(1);
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}
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}
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}
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else
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setreuid(run_uid, run_uid);
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#endif /* !SVR4 */
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execv(pathname, &argv[optind]);
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perror("strace: exec");
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_exit(1);
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break;
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}
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default:
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if ((tcp = alloctcb(pid)) == NULL) {
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fprintf(stderr, "tcb table full\n");
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cleanup();
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exit(1);
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}
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#ifdef SVR4
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if (proc_open(tcp, 0) < 0) {
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fprintf(stderr, "trouble opening proc file\n");
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cleanup();
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exit(1);
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}
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#endif /* SVR4 */
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#ifndef SVR4
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fake_execve(tcp, pathname, &argv[optind], environ);
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#endif
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break;
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}
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}
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else if (pflag_seen == 0)
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usage(stderr, 1);
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|
|
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sigemptyset(&empty_set);
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sigemptyset(&blocked_set);
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sa.sa_handler = SIG_IGN;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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sigaction(SIGTTOU, &sa, NULL);
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sigaction(SIGTTIN, &sa, NULL);
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|
if (interactive) {
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sigaddset(&blocked_set, SIGHUP);
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sigaddset(&blocked_set, SIGINT);
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sigaddset(&blocked_set, SIGQUIT);
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sigaddset(&blocked_set, SIGPIPE);
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sigaddset(&blocked_set, SIGTERM);
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sa.sa_handler = interrupt;
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#ifdef SUNOS4
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/* POSIX signals on sunos4.1 are a little broken. */
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sa.sa_flags = SA_INTERRUPT;
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#endif /* SUNOS4 */
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}
|
|
sigaction(SIGHUP, &sa, NULL);
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sigaction(SIGINT, &sa, NULL);
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|
sigaction(SIGQUIT, &sa, NULL);
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sigaction(SIGPIPE, &sa, NULL);
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sigaction(SIGTERM, &sa, NULL);
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#ifdef SVR4
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sa.sa_handler = reaper;
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sigaction(SIGCHLD, &sa, NULL);
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#endif /* SVR4 */
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|
|
if (trace() < 0)
|
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exit(1);
|
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cleanup();
|
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exit(0);
|
|
}
|
|
|
|
void
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|
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 HAVE_POLLABLE_PROCFS
|
|
static int last_pfd;
|
|
#endif
|
|
|
|
#ifdef HAVE_MP_PROCFS
|
|
/* Open the process pseudo-files in /proc. */
|
|
sprintf(proc, "/proc/%d/ctl", tcp->pid);
|
|
if ((tcp->pfd = open(proc, O_WRONLY|O_EXCL)) < 0) {
|
|
perror("strace: open(\"/proc/...\", ...)");
|
|
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;
|
|
}
|
|
sprintf(proc, "/proc/%d/status", tcp->pid);
|
|
if ((tcp->pfd_stat = open(proc, O_RDONLY|O_EXCL)) < 0) {
|
|
perror("strace: open(\"/proc/...\", ...)");
|
|
return -1;
|
|
}
|
|
if ((arg = fcntl(tcp->pfd_stat, F_GETFD)) < 0) {
|
|
perror("F_GETFD");
|
|
return -1;
|
|
}
|
|
if (fcntl(tcp->pfd_stat, F_SETFD, arg|FD_CLOEXEC) < 0) {
|
|
perror("F_SETFD");
|
|
return -1;
|
|
}
|
|
sprintf(proc, "/proc/%d/as", tcp->pid);
|
|
if ((tcp->pfd_as = open(proc, O_RDONLY|O_EXCL)) < 0) {
|
|
perror("strace: open(\"/proc/...\", ...)");
|
|
return -1;
|
|
}
|
|
if ((arg = fcntl(tcp->pfd_as, F_GETFD)) < 0) {
|
|
perror("F_GETFD");
|
|
return -1;
|
|
}
|
|
if (fcntl(tcp->pfd_as, F_SETFD, arg|FD_CLOEXEC) < 0) {
|
|
perror("F_SETFD");
|
|
return -1;
|
|
}
|
|
#else
|
|
/* 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;
|
|
}
|
|
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;
|
|
}
|
|
#endif
|
|
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_STATUS (tcp) < 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, NULL) < 0) {
|
|
perror("strace: PIOCSTOP");
|
|
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. */
|
|
arg = PRSABORT;
|
|
if (IOCTL (tcp->pfd, PIOCRUN, &arg) < 0) {
|
|
perror("PIOCRUN");
|
|
return -1;
|
|
}
|
|
#endif /* !MIPS */
|
|
for (;;) {
|
|
/* Wait for the child to do something. */
|
|
if (IOCTL_WSTOP (tcp) < 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. */
|
|
arg = 0;
|
|
if (IOCTL(tcp->pfd, PIOCRUN, &arg) < 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 defined(SPARC)
|
|
#undef PTRACE_DETACH
|
|
#define PTRACE_DETACH PTRACE_SUNDETACH
|
|
#endif
|
|
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 = POLLWANT;
|
|
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 = POLLWANT;
|
|
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 & POLLWANT)) {
|
|
/*
|
|
* 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 & POLLWANT) {
|
|
last = j;
|
|
return pollv[j].fd;
|
|
}
|
|
}
|
|
fprintf(stderr, "strace: nothing ready\n");
|
|
exit(1);
|
|
}
|
|
|
|
static int
|
|
trace()
|
|
{
|
|
#ifdef POLL_HACK
|
|
struct tcb *in_syscall;
|
|
#endif
|
|
struct tcb *tcp;
|
|
int pfd;
|
|
int what;
|
|
int ioctl_result = 0, ioctl_errno = 0;
|
|
long arg;
|
|
|
|
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
|
|
#ifdef POLL_HACK
|
|
/* On some systems (e.g. UnixWare) we get too much ugly
|
|
"unfinished..." stuff when multiple proceses are in
|
|
syscalls. Here's a nasty hack */
|
|
|
|
if (in_syscall) {
|
|
struct pollfd pv;
|
|
tcp = in_syscall;
|
|
in_syscall = NULL;
|
|
pv.fd = tcp->pfd;
|
|
pv.events = POLLWANT;
|
|
if ((what = poll (&pv, 1, 1)) < 0) {
|
|
if (interrupted)
|
|
return 0;
|
|
continue;
|
|
}
|
|
else if (what == 1 && pv.revents & POLLWANT) {
|
|
goto FOUND;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
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);
|
|
}
|
|
FOUND:
|
|
/* Get the status of the process. */
|
|
if (!interrupted) {
|
|
ioctl_result = IOCTL_WSTOP (tcp);
|
|
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:
|
|
#ifdef POLL_HACK
|
|
in_syscall = tcp;
|
|
#endif
|
|
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) ---",
|
|
signame(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;
|
|
}
|
|
arg = 0;
|
|
if (IOCTL (tcp->pfd, PIOCRUN, &arg) < 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) {
|
|
#if 0 /* XXX davidm */ /* WTA: disabled again */
|
|
struct tcb *tcpchild;
|
|
|
|
if ((tcpchild = alloctcb(pid)) == NULL) {
|
|
fprintf(stderr, " [tcb table full]\n");
|
|
kill(pid, SIGKILL); /* XXX */
|
|
return 0;
|
|
}
|
|
tcpchild->flags |= TCB_ATTACHED;
|
|
newoutf(tcpchild);
|
|
tcp->nchildren++;
|
|
if (!qflag)
|
|
fprintf(stderr, "Process %d attached\n", pid);
|
|
#else
|
|
fprintf(stderr, "unknown pid: %u\n", pid);
|
|
if (WIFSTOPPED(status))
|
|
ptrace(PTRACE_CONT, pid, (char *) 1, 0);
|
|
exit(1);
|
|
#endif
|
|
}
|
|
/* 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 +++",
|
|
signame(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, signame(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) ---",
|
|
signame(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;
|
|
}
|
|
|
|
#ifdef HAVE_MP_PROCFS
|
|
|
|
int mp_ioctl (int fd, int cmd, void *arg, int size) {
|
|
|
|
struct iovec iov[2];
|
|
int n = 1;
|
|
|
|
iov[0].iov_base = &cmd;
|
|
iov[0].iov_len = sizeof cmd;
|
|
if (arg) {
|
|
++n;
|
|
iov[1].iov_base = arg;
|
|
iov[1].iov_len = size;
|
|
}
|
|
|
|
return writev (fd, iov, n);
|
|
}
|
|
|
|
#endif
|