cdab1becb0
* strace.c (usage): Tweak help text: remove unpaired closing brackets, make -V and -h sit on separate lines (hard to see them otherwise). Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
3037 lines
71 KiB
C
3037 lines
71 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 "defs.h"
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#include <sys/types.h>
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#include <stdarg.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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#include <dirent.h>
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#include <sys/utsname.h>
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#ifdef LINUX
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# include <asm/unistd.h>
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# if defined __NR_tkill
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# define my_tkill(tid, sig) syscall(__NR_tkill, (tid), (sig))
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# else
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/* kill() may choose arbitrarily the target task of the process group
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while we later wait on a that specific TID. PID process waits become
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TID task specific waits for a process under ptrace(2). */
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# warning "Neither tkill(2) nor tgkill(2) available, risk of strace hangs!"
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# define my_tkill(tid, sig) kill((tid), (sig))
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# endif
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#endif
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#if defined(IA64) && defined(LINUX)
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# include <asm/ptrace_offsets.h>
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#endif
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#ifdef USE_PROCFS
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#include <poll.h>
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#endif
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#ifdef SVR4
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#include <sys/stropts.h>
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#ifdef HAVE_MP_PROCFS
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#ifdef HAVE_SYS_UIO_H
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#include <sys/uio.h>
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#endif
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#endif
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#endif
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extern char **environ;
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extern int optind;
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extern char *optarg;
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int debug = 0, followfork = 0;
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unsigned int ptrace_setoptions = 0;
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/* Which WSTOPSIG(status) value marks syscall traps? */
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static unsigned int syscall_trap_sig = SIGTRAP;
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int dtime = 0, xflag = 0, qflag = 0;
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cflag_t cflag = CFLAG_NONE;
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static int iflag = 0, pflag_seen = 0, rflag = 0, tflag = 0;
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/* -I n */
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enum {
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INTR_NOT_SET = 0,
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INTR_ANYWHERE = 1, /* don't block/ignore any signals */
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INTR_WHILE_WAIT = 2, /* block fatal signals while decoding syscall. default */
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INTR_NEVER = 3, /* block fatal signals. default if '-o FILE PROG' */
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INTR_BLOCK_TSTP_TOO = 4, /* block fatal signals and SIGTSTP (^Z) */
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NUM_INTR_OPTS
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};
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static int opt_intr;
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/* We play with signal mask only if this mode is active: */
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#define interactive (opt_intr == INTR_WHILE_WAIT)
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/*
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* daemonized_tracer supports -D option.
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* With this option, strace forks twice.
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* Unlike normal case, with -D *grandparent* process exec's,
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* becoming a traced process. Child exits (this prevents traced process
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* from having children it doesn't expect to have), and grandchild
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* attaches to grandparent similarly to strace -p PID.
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* This allows for more transparent interaction in cases
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* when process and its parent are communicating via signals,
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* wait() etc. Without -D, strace process gets lodged in between,
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* disrupting parent<->child link.
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*/
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static bool daemonized_tracer = 0;
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#ifdef USE_SEIZE
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static int post_attach_sigstop = TCB_IGNORE_ONE_SIGSTOP;
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# define use_seize (post_attach_sigstop == 0)
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#else
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# define post_attach_sigstop TCB_IGNORE_ONE_SIGSTOP
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# define use_seize 0
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#endif
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/* Sometimes we want to print only succeeding syscalls. */
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int not_failing_only = 0;
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/* Show path associated with fd arguments */
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int show_fd_path = 0;
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/* are we filtering traces based on paths? */
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int tracing_paths = 0;
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static int exit_code = 0;
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static int strace_child = 0;
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static int strace_tracer_pid = 0;
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static char *username = NULL;
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static uid_t run_uid;
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static gid_t run_gid;
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int max_strlen = DEFAULT_STRLEN;
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static int acolumn = DEFAULT_ACOLUMN;
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static char *acolumn_spaces;
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static char *outfname = NULL;
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static FILE *outf;
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struct tcb *printing_tcp = NULL;
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static int curcol;
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static struct tcb **tcbtab;
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static unsigned int nprocs, tcbtabsize;
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static const char *progname;
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static char *os_release; /* from uname() */
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static int detach(struct tcb *tcp);
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static int trace(void);
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static void cleanup(void);
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static void interrupt(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
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static volatile int interrupted;
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#endif
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#ifdef USE_PROCFS
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static struct tcb *pfd2tcb(int pfd);
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static void reaper(int sig);
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static void rebuild_pollv(void);
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static struct pollfd *pollv;
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#ifndef HAVE_POLLABLE_PROCFS
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static void proc_poll_open(void);
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static void proc_poller(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 /* USE_PROCFS */
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static void
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usage(FILE *ofp, int exitval)
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{
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fprintf(ofp, "\
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usage: strace [-CdDffhiqrtttTvVxxy] [-I n] [-a column] [-e expr]... [-o file]\n\
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[-p pid]... [-s strsize] [-u username] [-E var=val]...\n\
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[-P path] [PROG [ARGS]]\n\
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or: strace -c [-D] [-I n] [-e expr]... [-O overhead] [-S sortby] [-E var=val]...\n\
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[PROG [ARGS]]\n\
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-c -- count time, calls, and errors for each syscall and report summary\n\
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-C -- like -c but also print regular output while processes are running\n\
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-D -- run tracer process as a detached grandchild, not as parent\n\
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-f -- follow forks, -ff -- with output into separate files\n\
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-F -- attempt to follow vforks\n\
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-i -- print instruction pointer at time of syscall\n\
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-I interruptible\n\
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1: no signals are blocked\n\
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2: fatal signals are blocked while decoding syscall (default)\n\
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3: fatal signals are always blocked (default if '-o FILE PROG')\n\
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4: fatal signals and SIGTSTP (^Z) are always blocked\n\
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(useful to make 'strace -o FILE PROG' not stop on ^Z)\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\n\
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-v -- verbose mode: print unabbreviated argv, stat, termios, 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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-y -- print paths associated with file descriptor arguments\n\
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-h -- print help message\n\
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-V -- print version\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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-E var=val -- put var=val in the environment for command\n\
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-E var -- remove var from the environment for command\n\
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-P path -- trace accesses to path\n\
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" /* this is broken, so don't document it
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-z -- print only succeeding syscalls\n\
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*/
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, DEFAULT_ACOLUMN, DEFAULT_STRLEN, DEFAULT_SORTBY);
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exit(exitval);
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}
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static void die(void) __attribute__ ((noreturn));
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static void die(void)
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{
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if (strace_tracer_pid == getpid()) {
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cflag = 0;
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cleanup();
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}
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exit(1);
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}
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static void verror_msg(int err_no, const char *fmt, va_list p)
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{
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char *msg;
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fflush(NULL);
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/* We want to print entire message with single fprintf to ensure
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* message integrity if stderr is shared with other programs.
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* Thus we use vasprintf + single fprintf.
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*/
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msg = NULL;
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if (vasprintf(&msg, fmt, p) >= 0) {
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if (err_no)
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fprintf(stderr, "%s: %s: %s\n", progname, msg, strerror(err_no));
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else
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fprintf(stderr, "%s: %s\n", progname, msg);
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free(msg);
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} else {
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/* malloc in vasprintf failed, try it without malloc */
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fprintf(stderr, "%s: ", progname);
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vfprintf(stderr, fmt, p);
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if (err_no)
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fprintf(stderr, ": %s\n", strerror(err_no));
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else
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putc('\n', stderr);
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}
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/* We don't switch stderr to buffered, thus fprintf(stderr)
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* always flushes its output and this is not necessary: */
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/* fflush(stderr); */
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}
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void error_msg(const char *fmt, ...)
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{
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va_list p;
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va_start(p, fmt);
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verror_msg(0, fmt, p);
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va_end(p);
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}
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void error_msg_and_die(const char *fmt, ...)
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{
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va_list p;
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va_start(p, fmt);
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verror_msg(0, fmt, p);
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die();
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}
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void perror_msg(const char *fmt, ...)
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{
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va_list p;
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va_start(p, fmt);
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verror_msg(errno, fmt, p);
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va_end(p);
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}
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void perror_msg_and_die(const char *fmt, ...)
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{
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va_list p;
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va_start(p, fmt);
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verror_msg(errno, fmt, p);
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die();
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}
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void die_out_of_memory(void)
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{
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static bool recursed = 0;
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if (recursed)
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exit(1);
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recursed = 1;
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error_msg_and_die("Out of memory");
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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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/* Glue for systems without a MMU that cannot provide fork() */
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#ifdef HAVE_FORK
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# define strace_vforked 0
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#else
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# define strace_vforked 1
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# define fork() vfork()
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#endif
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#ifdef USE_SEIZE
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static int
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ptrace_attach_or_seize(int pid)
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{
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int r;
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if (!use_seize)
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return ptrace(PTRACE_ATTACH, pid, 0, 0);
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r = ptrace(PTRACE_SEIZE, pid, 0, PTRACE_SEIZE_DEVEL);
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if (r)
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return r;
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r = ptrace(PTRACE_INTERRUPT, pid, 0, 0);
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return r;
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}
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#else
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# define ptrace_attach_or_seize(pid) ptrace(PTRACE_ATTACH, (pid), 0, 0)
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#endif
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static void
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set_cloexec_flag(int fd)
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{
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int flags, newflags;
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flags = fcntl(fd, F_GETFD);
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if (flags < 0) {
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/* Can happen only if fd is bad.
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* Should never happen: if it does, we have a bug
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* in the caller. Therefore we just abort
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* instead of propagating the error.
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*/
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perror_msg_and_die("fcntl(%d, F_GETFD)", fd);
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}
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newflags = flags | FD_CLOEXEC;
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if (flags == newflags)
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return;
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fcntl(fd, F_SETFD, newflags); /* never fails */
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}
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/*
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* When strace is setuid executable, we have to swap uids
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* before and after filesystem and process management operations.
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*/
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static void
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swap_uid(void)
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{
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#ifndef SVR4
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int euid = geteuid(), uid = getuid();
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if (euid != uid && setreuid(euid, uid) < 0) {
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perror_msg_and_die("setreuid");
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}
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#endif
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}
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#if _LFS64_LARGEFILE
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# define fopen_for_output fopen64
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#else
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# define fopen_for_output fopen
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#endif
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static FILE *
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strace_fopen(const char *path)
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{
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FILE *fp;
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swap_uid();
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fp = fopen_for_output(path, "w");
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if (!fp)
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perror_msg_and_die("Can't fopen '%s'", path);
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swap_uid();
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set_cloexec_flag(fileno(fp));
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return fp;
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}
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static int popen_pid = 0;
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#ifndef _PATH_BSHELL
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# define _PATH_BSHELL "/bin/sh"
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#endif
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/*
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* We cannot use standard popen(3) here because we have to distinguish
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* popen child process from other processes we trace, and standard popen(3)
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* does not export its child's pid.
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*/
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static FILE *
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strace_popen(const char *command)
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{
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FILE *fp;
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int fds[2];
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swap_uid();
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if (pipe(fds) < 0)
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perror_msg_and_die("pipe");
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set_cloexec_flag(fds[1]); /* never fails */
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popen_pid = vfork();
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if (popen_pid == -1)
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perror_msg_and_die("vfork");
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if (popen_pid == 0) {
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/* child */
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close(fds[1]);
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if (fds[0] != 0) {
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if (dup2(fds[0], 0))
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perror_msg_and_die("dup2");
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close(fds[0]);
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}
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execl(_PATH_BSHELL, "sh", "-c", command, NULL);
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perror_msg_and_die("Can't execute '%s'", _PATH_BSHELL);
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}
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/* parent */
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close(fds[0]);
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swap_uid();
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fp = fdopen(fds[1], "w");
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if (!fp)
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die_out_of_memory();
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return fp;
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}
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static void
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newoutf(struct tcb *tcp)
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{
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if (outfname && followfork > 1) {
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char name[520 + sizeof(int) * 3];
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sprintf(name, "%.512s.%u", outfname, tcp->pid);
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tcp->outf = strace_fopen(name);
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}
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}
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static void
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startup_attach(void)
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{
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int tcbi;
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struct tcb *tcp;
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/*
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* Block user interruptions as we would leave the traced
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* process stopped (process state T) if we would terminate in
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* between PTRACE_ATTACH and wait4() on SIGSTOP.
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* We rely on cleanup() from this point on.
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*/
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if (interactive)
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sigprocmask(SIG_BLOCK, &blocked_set, NULL);
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|
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if (daemonized_tracer) {
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pid_t pid = fork();
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if (pid < 0) {
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perror_msg_and_die("fork");
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}
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if (pid) { /* parent */
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/*
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* Wait for grandchild to attach to straced process
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* (grandparent). Grandchild SIGKILLs us after it attached.
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* Grandparent's wait() is unblocked by our death,
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* it proceeds to exec the straced program.
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*/
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pause();
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_exit(0); /* paranoia */
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}
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/* grandchild */
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/* We will be the tracer process. Remember our new pid: */
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strace_tracer_pid = getpid();
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}
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|
|
for (tcbi = 0; tcbi < tcbtabsize; tcbi++) {
|
|
tcp = tcbtab[tcbi];
|
|
|
|
/* Is this a process we should attach to, but not yet attached? */
|
|
if ((tcp->flags & (TCB_ATTACHED | TCB_STARTUP)) != TCB_ATTACHED)
|
|
continue; /* no */
|
|
|
|
/* Reinitialize the output since it may have changed */
|
|
tcp->outf = outf;
|
|
newoutf(tcp);
|
|
|
|
#ifdef USE_PROCFS
|
|
if (proc_open(tcp, 1) < 0) {
|
|
fprintf(stderr, "trouble opening proc file\n");
|
|
droptcb(tcp);
|
|
continue;
|
|
}
|
|
#else /* !USE_PROCFS */
|
|
# ifdef LINUX
|
|
if (followfork && !daemonized_tracer) {
|
|
char procdir[sizeof("/proc/%d/task") + sizeof(int) * 3];
|
|
DIR *dir;
|
|
|
|
sprintf(procdir, "/proc/%d/task", tcp->pid);
|
|
dir = opendir(procdir);
|
|
if (dir != NULL) {
|
|
unsigned int ntid = 0, nerr = 0;
|
|
struct dirent *de;
|
|
|
|
while ((de = readdir(dir)) != NULL) {
|
|
struct tcb *cur_tcp;
|
|
int tid;
|
|
|
|
if (de->d_fileno == 0)
|
|
continue;
|
|
tid = atoi(de->d_name);
|
|
if (tid <= 0)
|
|
continue;
|
|
++ntid;
|
|
if (ptrace_attach_or_seize(tid) < 0) {
|
|
++nerr;
|
|
if (debug)
|
|
fprintf(stderr, "attach to pid %d failed\n", tid);
|
|
continue;
|
|
}
|
|
if (debug)
|
|
fprintf(stderr, "attach to pid %d succeeded\n", tid);
|
|
cur_tcp = tcp;
|
|
if (tid != tcp->pid)
|
|
cur_tcp = alloctcb(tid);
|
|
cur_tcp->flags |= TCB_ATTACHED | TCB_STARTUP | post_attach_sigstop;
|
|
}
|
|
closedir(dir);
|
|
if (interactive) {
|
|
sigprocmask(SIG_SETMASK, &empty_set, NULL);
|
|
if (interrupted)
|
|
goto ret;
|
|
sigprocmask(SIG_BLOCK, &blocked_set, NULL);
|
|
}
|
|
ntid -= nerr;
|
|
if (ntid == 0) {
|
|
perror("attach: ptrace(PTRACE_ATTACH, ...)");
|
|
droptcb(tcp);
|
|
continue;
|
|
}
|
|
if (!qflag) {
|
|
fprintf(stderr, ntid > 1
|
|
? "Process %u attached with %u threads - interrupt to quit\n"
|
|
: "Process %u attached - interrupt to quit\n",
|
|
tcp->pid, ntid);
|
|
}
|
|
if (!(tcp->flags & TCB_STARTUP)) {
|
|
/* -p PID, we failed to attach to PID itself
|
|
* but did attach to some of its sibling threads.
|
|
* Drop PID's tcp.
|
|
*/
|
|
droptcb(tcp);
|
|
}
|
|
continue;
|
|
} /* if (opendir worked) */
|
|
} /* if (-f) */
|
|
# endif /* LINUX */
|
|
if (ptrace_attach_or_seize(tcp->pid) < 0) {
|
|
perror("attach: ptrace(PTRACE_ATTACH, ...)");
|
|
droptcb(tcp);
|
|
continue;
|
|
}
|
|
tcp->flags |= TCB_STARTUP | post_attach_sigstop;
|
|
if (debug)
|
|
fprintf(stderr, "attach to pid %d (main) succeeded\n", tcp->pid);
|
|
|
|
if (daemonized_tracer) {
|
|
/*
|
|
* It is our grandparent we trace, not a -p PID.
|
|
* Don't want to just detach on exit, so...
|
|
*/
|
|
tcp->flags &= ~TCB_ATTACHED;
|
|
/*
|
|
* Make parent go away.
|
|
* Also makes grandparent's wait() unblock.
|
|
*/
|
|
kill(getppid(), SIGKILL);
|
|
}
|
|
|
|
#endif /* !USE_PROCFS */
|
|
if (!qflag)
|
|
fprintf(stderr,
|
|
"Process %u attached - interrupt to quit\n",
|
|
tcp->pid);
|
|
} /* for each tcbtab[] */
|
|
|
|
ret:
|
|
if (interactive)
|
|
sigprocmask(SIG_SETMASK, &empty_set, NULL);
|
|
}
|
|
|
|
static void
|
|
startup_child(char **argv)
|
|
{
|
|
struct stat statbuf;
|
|
const char *filename;
|
|
char pathname[MAXPATHLEN];
|
|
int pid = 0;
|
|
struct tcb *tcp;
|
|
|
|
filename = argv[0];
|
|
if (strchr(filename, '/')) {
|
|
if (strlen(filename) > sizeof pathname - 1) {
|
|
errno = ENAMETOOLONG;
|
|
perror_msg_and_die("exec");
|
|
}
|
|
strcpy(pathname, filename);
|
|
}
|
|
#ifdef USE_DEBUGGING_EXEC
|
|
/*
|
|
* Debuggers customarily check the current directory
|
|
* first regardless of the path but doing that gives
|
|
* security geeks a panic attack.
|
|
*/
|
|
else if (stat(filename, &statbuf) == 0)
|
|
strcpy(pathname, filename);
|
|
#endif /* USE_DEBUGGING_EXEC */
|
|
else {
|
|
const char *path;
|
|
int m, n, len;
|
|
|
|
for (path = getenv("PATH"); path && *path; path += m) {
|
|
const char *colon = strchr(path, ':');
|
|
if (colon) {
|
|
n = colon - path;
|
|
m = n + 1;
|
|
}
|
|
else
|
|
m = n = strlen(path);
|
|
if (n == 0) {
|
|
if (!getcwd(pathname, MAXPATHLEN))
|
|
continue;
|
|
len = strlen(pathname);
|
|
}
|
|
else if (n > sizeof pathname - 1)
|
|
continue;
|
|
else {
|
|
strncpy(pathname, path, n);
|
|
len = n;
|
|
}
|
|
if (len && pathname[len - 1] != '/')
|
|
pathname[len++] = '/';
|
|
strcpy(pathname + len, filename);
|
|
if (stat(pathname, &statbuf) == 0 &&
|
|
/* Accept only regular files
|
|
with some execute bits set.
|
|
XXX not perfect, might still fail */
|
|
S_ISREG(statbuf.st_mode) &&
|
|
(statbuf.st_mode & 0111))
|
|
break;
|
|
}
|
|
}
|
|
if (stat(pathname, &statbuf) < 0) {
|
|
perror_msg_and_die("Can't stat '%s'", filename);
|
|
}
|
|
strace_child = pid = fork();
|
|
if (pid < 0) {
|
|
perror_msg_and_die("fork");
|
|
}
|
|
if ((pid != 0 && daemonized_tracer) /* -D: parent to become a traced process */
|
|
|| (pid == 0 && !daemonized_tracer) /* not -D: child to become a traced process */
|
|
) {
|
|
pid = getpid();
|
|
if (outf != stderr)
|
|
close(fileno(outf));
|
|
#ifdef USE_PROCFS
|
|
# ifdef MIPS
|
|
/* Kludge for SGI, see proc_open for details. */
|
|
sa.sa_handler = foobar;
|
|
sa.sa_flags = 0;
|
|
sigemptyset(&sa.sa_mask);
|
|
sigaction(SIGINT, &sa, NULL);
|
|
# endif
|
|
# ifndef FREEBSD
|
|
pause();
|
|
# else
|
|
kill(pid, SIGSTOP);
|
|
# endif
|
|
#else /* !USE_PROCFS */
|
|
if (!daemonized_tracer && !use_seize) {
|
|
if (ptrace(PTRACE_TRACEME, 0L, 0L, 0L) < 0) {
|
|
perror_msg_and_die("ptrace(PTRACE_TRACEME, ...)");
|
|
}
|
|
}
|
|
|
|
if (username != NULL) {
|
|
uid_t run_euid = run_uid;
|
|
gid_t run_egid = run_gid;
|
|
|
|
if (statbuf.st_mode & S_ISUID)
|
|
run_euid = statbuf.st_uid;
|
|
if (statbuf.st_mode & S_ISGID)
|
|
run_egid = statbuf.st_gid;
|
|
/*
|
|
* It is important to set groups before we
|
|
* lose privileges on setuid.
|
|
*/
|
|
if (initgroups(username, run_gid) < 0) {
|
|
perror_msg_and_die("initgroups");
|
|
}
|
|
if (setregid(run_gid, run_egid) < 0) {
|
|
perror_msg_and_die("setregid");
|
|
}
|
|
if (setreuid(run_uid, run_euid) < 0) {
|
|
perror_msg_and_die("setreuid");
|
|
}
|
|
}
|
|
else if (geteuid() != 0)
|
|
setreuid(run_uid, run_uid);
|
|
|
|
if (!daemonized_tracer) {
|
|
/*
|
|
* Induce a ptrace stop. Tracer (our parent)
|
|
* will resume us with PTRACE_SYSCALL and display
|
|
* the immediately following execve syscall.
|
|
* Can't do this on NOMMU systems, we are after
|
|
* vfork: parent is blocked, stopping would deadlock.
|
|
*/
|
|
if (!strace_vforked)
|
|
kill(pid, SIGSTOP);
|
|
} else {
|
|
struct sigaction sv_sigchld;
|
|
sigaction(SIGCHLD, NULL, &sv_sigchld);
|
|
/*
|
|
* Make sure it is not SIG_IGN, otherwise wait
|
|
* will not block.
|
|
*/
|
|
signal(SIGCHLD, SIG_DFL);
|
|
/*
|
|
* Wait for grandchild to attach to us.
|
|
* It kills child after that, and wait() unblocks.
|
|
*/
|
|
alarm(3);
|
|
wait(NULL);
|
|
alarm(0);
|
|
sigaction(SIGCHLD, &sv_sigchld, NULL);
|
|
}
|
|
#endif /* !USE_PROCFS */
|
|
|
|
execv(pathname, argv);
|
|
perror_msg_and_die("exec");
|
|
}
|
|
|
|
/* We are the tracer */
|
|
|
|
if (!daemonized_tracer) {
|
|
if (!use_seize) {
|
|
/* child did PTRACE_TRACEME, nothing to do in parent */
|
|
} else {
|
|
if (!strace_vforked) {
|
|
/* Wait until child stopped itself */
|
|
int status;
|
|
while (waitpid(pid, &status, WSTOPPED) < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
perror_msg_and_die("waitpid");
|
|
}
|
|
if (!WIFSTOPPED(status) || WSTOPSIG(status) != SIGSTOP) {
|
|
kill(pid, SIGKILL);
|
|
perror_msg_and_die("Unexpected wait status %x", status);
|
|
}
|
|
}
|
|
/* Else: vforked case, we have no way to sync.
|
|
* Just attach to it as soon as possible.
|
|
* This means that we may miss a few first syscalls...
|
|
*/
|
|
|
|
if (ptrace_attach_or_seize(pid)) {
|
|
kill(pid, SIGKILL);
|
|
perror_msg_and_die("Can't attach to %d", pid);
|
|
}
|
|
if (!strace_vforked)
|
|
kill(pid, SIGCONT);
|
|
}
|
|
tcp = alloctcb(pid);
|
|
if (!strace_vforked)
|
|
tcp->flags |= TCB_STARTUP | post_attach_sigstop;
|
|
else
|
|
tcp->flags |= TCB_STARTUP;
|
|
}
|
|
else {
|
|
/* With -D, *we* are child here, IOW: different pid. Fetch it: */
|
|
strace_tracer_pid = getpid();
|
|
/* The tracee is our parent: */
|
|
pid = getppid();
|
|
tcp = alloctcb(pid);
|
|
/* We want subsequent startup_attach() to attach to it: */
|
|
tcp->flags |= TCB_ATTACHED;
|
|
}
|
|
#ifdef USE_PROCFS
|
|
if (proc_open(tcp, 0) < 0) {
|
|
perror_msg_and_die("trouble opening proc file");
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#ifdef LINUX
|
|
static void kill_save_errno(pid_t pid, int sig)
|
|
{
|
|
int saved_errno = errno;
|
|
|
|
(void) kill(pid, sig);
|
|
errno = saved_errno;
|
|
}
|
|
|
|
/*
|
|
* Test whether the kernel support PTRACE_O_TRACECLONE et al options.
|
|
* First fork a new child, call ptrace with PTRACE_SETOPTIONS on it,
|
|
* and then see which options are supported by the kernel.
|
|
*/
|
|
static void
|
|
test_ptrace_setoptions_followfork(void)
|
|
{
|
|
int pid, expected_grandchild = 0, found_grandchild = 0;
|
|
const unsigned int test_options = PTRACE_O_TRACECLONE |
|
|
PTRACE_O_TRACEFORK |
|
|
PTRACE_O_TRACEVFORK;
|
|
|
|
pid = fork();
|
|
if (pid < 0)
|
|
perror_msg_and_die("fork");
|
|
if (pid == 0) {
|
|
pid = getpid();
|
|
if (ptrace(PTRACE_TRACEME, 0L, 0L, 0L) < 0)
|
|
perror_msg_and_die("%s: PTRACE_TRACEME doesn't work",
|
|
__func__);
|
|
kill(pid, SIGSTOP);
|
|
if (fork() < 0)
|
|
perror_msg_and_die("fork");
|
|
_exit(0);
|
|
}
|
|
|
|
while (1) {
|
|
int status, tracee_pid;
|
|
|
|
errno = 0;
|
|
tracee_pid = wait(&status);
|
|
if (tracee_pid <= 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
else if (errno == ECHILD)
|
|
break;
|
|
kill_save_errno(pid, SIGKILL);
|
|
perror_msg_and_die("%s: unexpected wait result %d",
|
|
__func__, tracee_pid);
|
|
}
|
|
if (WIFEXITED(status)) {
|
|
if (WEXITSTATUS(status)) {
|
|
if (tracee_pid != pid)
|
|
kill_save_errno(pid, SIGKILL);
|
|
error_msg_and_die("%s: unexpected exit status %u",
|
|
__func__, WEXITSTATUS(status));
|
|
}
|
|
continue;
|
|
}
|
|
if (WIFSIGNALED(status)) {
|
|
if (tracee_pid != pid)
|
|
kill_save_errno(pid, SIGKILL);
|
|
error_msg_and_die("%s: unexpected signal %u",
|
|
__func__, WTERMSIG(status));
|
|
}
|
|
if (!WIFSTOPPED(status)) {
|
|
if (tracee_pid != pid)
|
|
kill_save_errno(tracee_pid, SIGKILL);
|
|
kill(pid, SIGKILL);
|
|
error_msg_and_die("%s: unexpected wait status %x",
|
|
__func__, status);
|
|
}
|
|
if (tracee_pid != pid) {
|
|
found_grandchild = tracee_pid;
|
|
if (ptrace(PTRACE_CONT, tracee_pid, 0, 0) < 0) {
|
|
kill_save_errno(tracee_pid, SIGKILL);
|
|
kill_save_errno(pid, SIGKILL);
|
|
perror_msg_and_die("PTRACE_CONT doesn't work");
|
|
}
|
|
continue;
|
|
}
|
|
switch (WSTOPSIG(status)) {
|
|
case SIGSTOP:
|
|
if (ptrace(PTRACE_SETOPTIONS, pid, 0, test_options) < 0
|
|
&& errno != EINVAL && errno != EIO)
|
|
perror_msg("PTRACE_SETOPTIONS");
|
|
break;
|
|
case SIGTRAP:
|
|
if (status >> 16 == PTRACE_EVENT_FORK) {
|
|
long msg = 0;
|
|
|
|
if (ptrace(PTRACE_GETEVENTMSG, pid,
|
|
NULL, (long) &msg) == 0)
|
|
expected_grandchild = msg;
|
|
}
|
|
break;
|
|
}
|
|
if (ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0) {
|
|
kill_save_errno(pid, SIGKILL);
|
|
perror_msg_and_die("PTRACE_SYSCALL doesn't work");
|
|
}
|
|
}
|
|
if (expected_grandchild && expected_grandchild == found_grandchild) {
|
|
ptrace_setoptions |= test_options;
|
|
if (debug)
|
|
fprintf(stderr, "ptrace_setoptions = %#x\n",
|
|
ptrace_setoptions);
|
|
return;
|
|
}
|
|
error_msg("Test for PTRACE_O_TRACECLONE failed, "
|
|
"giving up using this feature.");
|
|
}
|
|
|
|
/*
|
|
* Test whether the kernel support PTRACE_O_TRACESYSGOOD.
|
|
* First fork a new child, call ptrace(PTRACE_SETOPTIONS) on it,
|
|
* and then see whether it will stop with (SIGTRAP | 0x80).
|
|
*
|
|
* Use of this option enables correct handling of user-generated SIGTRAPs,
|
|
* and SIGTRAPs generated by special instructions such as int3 on x86:
|
|
* _start: .globl _start
|
|
* int3
|
|
* movl $42, %ebx
|
|
* movl $1, %eax
|
|
* int $0x80
|
|
* (compile with: "gcc -nostartfiles -nostdlib -o int3 int3.S")
|
|
*/
|
|
static void
|
|
test_ptrace_setoptions_for_all(void)
|
|
{
|
|
const unsigned int test_options = PTRACE_O_TRACESYSGOOD |
|
|
PTRACE_O_TRACEEXEC;
|
|
int pid;
|
|
int it_worked = 0;
|
|
|
|
pid = fork();
|
|
if (pid < 0)
|
|
perror_msg_and_die("fork");
|
|
|
|
if (pid == 0) {
|
|
pid = getpid();
|
|
if (ptrace(PTRACE_TRACEME, 0L, 0L, 0L) < 0)
|
|
/* Note: exits with exitcode 1 */
|
|
perror_msg_and_die("%s: PTRACE_TRACEME doesn't work",
|
|
__func__);
|
|
kill(pid, SIGSTOP);
|
|
_exit(0); /* parent should see entry into this syscall */
|
|
}
|
|
|
|
while (1) {
|
|
int status, tracee_pid;
|
|
|
|
errno = 0;
|
|
tracee_pid = wait(&status);
|
|
if (tracee_pid <= 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
kill_save_errno(pid, SIGKILL);
|
|
perror_msg_and_die("%s: unexpected wait result %d",
|
|
__func__, tracee_pid);
|
|
}
|
|
if (WIFEXITED(status)) {
|
|
if (WEXITSTATUS(status) == 0)
|
|
break;
|
|
error_msg_and_die("%s: unexpected exit status %u",
|
|
__func__, WEXITSTATUS(status));
|
|
}
|
|
if (WIFSIGNALED(status)) {
|
|
error_msg_and_die("%s: unexpected signal %u",
|
|
__func__, WTERMSIG(status));
|
|
}
|
|
if (!WIFSTOPPED(status)) {
|
|
kill(pid, SIGKILL);
|
|
error_msg_and_die("%s: unexpected wait status %x",
|
|
__func__, status);
|
|
}
|
|
if (WSTOPSIG(status) == SIGSTOP) {
|
|
/*
|
|
* We don't check "options aren't accepted" error.
|
|
* If it happens, we'll never get (SIGTRAP | 0x80),
|
|
* and thus will decide to not use the option.
|
|
* IOW: the outcome of the test will be correct.
|
|
*/
|
|
if (ptrace(PTRACE_SETOPTIONS, pid, 0L, test_options) < 0
|
|
&& errno != EINVAL && errno != EIO)
|
|
perror_msg("PTRACE_SETOPTIONS");
|
|
}
|
|
if (WSTOPSIG(status) == (SIGTRAP | 0x80)) {
|
|
it_worked = 1;
|
|
}
|
|
if (ptrace(PTRACE_SYSCALL, pid, 0L, 0L) < 0) {
|
|
kill_save_errno(pid, SIGKILL);
|
|
perror_msg_and_die("PTRACE_SYSCALL doesn't work");
|
|
}
|
|
}
|
|
|
|
if (it_worked) {
|
|
syscall_trap_sig = (SIGTRAP | 0x80);
|
|
ptrace_setoptions |= test_options;
|
|
if (debug)
|
|
fprintf(stderr, "ptrace_setoptions = %#x\n",
|
|
ptrace_setoptions);
|
|
return;
|
|
}
|
|
|
|
error_msg("Test for PTRACE_O_TRACESYSGOOD failed, "
|
|
"giving up using this feature.");
|
|
}
|
|
|
|
# ifdef USE_SEIZE
|
|
static void
|
|
test_ptrace_seize(void)
|
|
{
|
|
int pid;
|
|
|
|
pid = fork();
|
|
if (pid < 0)
|
|
perror_msg_and_die("fork");
|
|
|
|
if (pid == 0) {
|
|
pause();
|
|
_exit(0);
|
|
}
|
|
|
|
/* PTRACE_SEIZE, unlike ATTACH, doesn't force tracee to trap. After
|
|
* attaching tracee continues to run unless a trap condition occurs.
|
|
* PTRACE_SEIZE doesn't affect signal or group stop state.
|
|
*/
|
|
if (ptrace(PTRACE_SEIZE, pid, 0, PTRACE_SEIZE_DEVEL) == 0) {
|
|
post_attach_sigstop = 0; /* this sets use_seize to 1 */
|
|
} else if (debug) {
|
|
fprintf(stderr, "PTRACE_SEIZE doesn't work\n");
|
|
}
|
|
|
|
kill(pid, SIGKILL);
|
|
|
|
while (1) {
|
|
int status, tracee_pid;
|
|
|
|
errno = 0;
|
|
tracee_pid = waitpid(pid, &status, 0);
|
|
if (tracee_pid <= 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
perror_msg_and_die("%s: unexpected wait result %d",
|
|
__func__, tracee_pid);
|
|
}
|
|
if (WIFSIGNALED(status)) {
|
|
return;
|
|
}
|
|
error_msg_and_die("%s: unexpected wait status %x",
|
|
__func__, status);
|
|
}
|
|
}
|
|
# else /* !USE_SEIZE */
|
|
# define test_ptrace_seize() ((void)0)
|
|
# endif
|
|
|
|
#endif
|
|
|
|
/* Noinline: don't want main to have struct utsname permanently on stack */
|
|
static void __attribute__ ((noinline))
|
|
get_os_release(void)
|
|
{
|
|
struct utsname u;
|
|
if (uname(&u) < 0)
|
|
perror_msg_and_die("uname");
|
|
os_release = strdup(u.release);
|
|
if (!os_release)
|
|
die_out_of_memory();
|
|
}
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
struct tcb *tcp;
|
|
int c, pid = 0;
|
|
int optF = 0;
|
|
struct sigaction sa;
|
|
|
|
progname = argv[0] ? argv[0] : "strace";
|
|
|
|
strace_tracer_pid = getpid();
|
|
|
|
get_os_release();
|
|
|
|
/* Allocate the initial tcbtab. */
|
|
tcbtabsize = argc; /* Surely enough for all -p args. */
|
|
tcbtab = calloc(tcbtabsize, sizeof(tcbtab[0]));
|
|
if (!tcbtab)
|
|
die_out_of_memory();
|
|
tcp = calloc(tcbtabsize, sizeof(*tcp));
|
|
if (!tcp)
|
|
die_out_of_memory();
|
|
for (c = 0; c < tcbtabsize; c++)
|
|
tcbtab[c] = tcp++;
|
|
|
|
outf = stderr;
|
|
set_sortby(DEFAULT_SORTBY);
|
|
set_personality(DEFAULT_PERSONALITY);
|
|
qualify("trace=all");
|
|
qualify("abbrev=all");
|
|
qualify("verbose=all");
|
|
qualify("signal=all");
|
|
while ((c = getopt(argc, argv,
|
|
"+cCdfFhiqrtTvVxyz"
|
|
#ifndef USE_PROCFS
|
|
"D"
|
|
#endif
|
|
"a:e:o:O:p:s:S:u:E:P:I:")) != EOF) {
|
|
switch (c) {
|
|
case 'c':
|
|
if (cflag == CFLAG_BOTH) {
|
|
error_msg_and_die("-c and -C are mutually exclusive options");
|
|
}
|
|
cflag = CFLAG_ONLY_STATS;
|
|
break;
|
|
case 'C':
|
|
if (cflag == CFLAG_ONLY_STATS) {
|
|
error_msg_and_die("-c and -C are mutually exclusive options");
|
|
}
|
|
cflag = CFLAG_BOTH;
|
|
break;
|
|
case 'd':
|
|
debug++;
|
|
break;
|
|
#ifndef USE_PROCFS
|
|
case 'D':
|
|
daemonized_tracer = 1;
|
|
break;
|
|
#endif
|
|
case 'F':
|
|
optF = 1;
|
|
break;
|
|
case 'f':
|
|
followfork++;
|
|
break;
|
|
case 'h':
|
|
usage(stdout, 0);
|
|
break;
|
|
case 'i':
|
|
iflag++;
|
|
break;
|
|
case 'q':
|
|
qflag++;
|
|
break;
|
|
case 'r':
|
|
rflag++;
|
|
tflag++;
|
|
break;
|
|
case 't':
|
|
tflag++;
|
|
break;
|
|
case 'T':
|
|
dtime++;
|
|
break;
|
|
case 'x':
|
|
xflag++;
|
|
break;
|
|
case 'y':
|
|
show_fd_path = 1;
|
|
break;
|
|
case 'v':
|
|
qualify("abbrev=none");
|
|
break;
|
|
case 'V':
|
|
printf("%s -- version %s\n", PACKAGE_NAME, VERSION);
|
|
exit(0);
|
|
break;
|
|
case 'z':
|
|
not_failing_only = 1;
|
|
break;
|
|
case 'a':
|
|
acolumn = atoi(optarg);
|
|
if (acolumn < 0)
|
|
error_msg_and_die("Bad column width '%s'", optarg);
|
|
break;
|
|
case 'e':
|
|
qualify(optarg);
|
|
break;
|
|
case 'o':
|
|
outfname = strdup(optarg);
|
|
break;
|
|
case 'O':
|
|
set_overhead(atoi(optarg));
|
|
break;
|
|
case 'p':
|
|
pid = atoi(optarg);
|
|
if (pid <= 0) {
|
|
error_msg("Invalid process id: '%s'", optarg);
|
|
break;
|
|
}
|
|
if (pid == strace_tracer_pid) {
|
|
error_msg("I'm sorry, I can't let you do that, Dave.");
|
|
break;
|
|
}
|
|
tcp = alloc_tcb(pid, 0);
|
|
tcp->flags |= TCB_ATTACHED;
|
|
pflag_seen++;
|
|
break;
|
|
case 'P':
|
|
tracing_paths = 1;
|
|
if (pathtrace_select(optarg)) {
|
|
error_msg_and_die("Failed to select path '%s'", optarg);
|
|
}
|
|
break;
|
|
case 's':
|
|
max_strlen = atoi(optarg);
|
|
if (max_strlen < 0) {
|
|
error_msg_and_die("Invalid -%c argument: '%s'", c, optarg);
|
|
}
|
|
break;
|
|
case 'S':
|
|
set_sortby(optarg);
|
|
break;
|
|
case 'u':
|
|
username = strdup(optarg);
|
|
break;
|
|
case 'E':
|
|
if (putenv(optarg) < 0)
|
|
die_out_of_memory();
|
|
break;
|
|
case 'I':
|
|
opt_intr = atoi(optarg);
|
|
if (opt_intr <= 0 || opt_intr >= NUM_INTR_OPTS) {
|
|
error_msg_and_die("Invalid -%c argument: '%s'", c, optarg);
|
|
}
|
|
break;
|
|
default:
|
|
usage(stderr, 1);
|
|
break;
|
|
}
|
|
}
|
|
argv += optind;
|
|
/* argc -= optind; - no need, argc is not used below */
|
|
|
|
acolumn_spaces = malloc(acolumn + 1);
|
|
if (!acolumn_spaces)
|
|
die_out_of_memory();
|
|
memset(acolumn_spaces, ' ', acolumn);
|
|
acolumn_spaces[acolumn] = '\0';
|
|
|
|
/* Must have PROG [ARGS], or -p PID. Not both. */
|
|
if (!argv[0] == !pflag_seen)
|
|
usage(stderr, 1);
|
|
|
|
if (pflag_seen && daemonized_tracer) {
|
|
error_msg_and_die("-D and -p are mutually exclusive options");
|
|
}
|
|
|
|
if (!followfork)
|
|
followfork = optF;
|
|
|
|
if (followfork > 1 && cflag) {
|
|
error_msg_and_die("(-c or -C) and -ff are mutually exclusive options");
|
|
}
|
|
|
|
/* See if they want to run as another user. */
|
|
if (username != NULL) {
|
|
struct passwd *pent;
|
|
|
|
if (getuid() != 0 || geteuid() != 0) {
|
|
error_msg_and_die("You must be root to use the -u option");
|
|
}
|
|
pent = getpwnam(username);
|
|
if (pent == NULL) {
|
|
error_msg_and_die("Cannot find user '%s'", username);
|
|
}
|
|
run_uid = pent->pw_uid;
|
|
run_gid = pent->pw_gid;
|
|
}
|
|
else {
|
|
run_uid = getuid();
|
|
run_gid = getgid();
|
|
}
|
|
|
|
#ifdef LINUX
|
|
if (followfork)
|
|
test_ptrace_setoptions_followfork();
|
|
test_ptrace_setoptions_for_all();
|
|
test_ptrace_seize();
|
|
#endif
|
|
|
|
/* Check if they want to redirect the output. */
|
|
if (outfname) {
|
|
/* See if they want to pipe the output. */
|
|
if (outfname[0] == '|' || outfname[0] == '!') {
|
|
/*
|
|
* We can't do the <outfname>.PID funny business
|
|
* when using popen, so prohibit it.
|
|
*/
|
|
if (followfork > 1)
|
|
error_msg_and_die("Piping the output and -ff are mutually exclusive");
|
|
outf = strace_popen(outfname + 1);
|
|
}
|
|
else if (followfork <= 1)
|
|
outf = strace_fopen(outfname);
|
|
}
|
|
|
|
if (!outfname || outfname[0] == '|' || outfname[0] == '!') {
|
|
char *buf = malloc(BUFSIZ);
|
|
if (!buf)
|
|
die_out_of_memory();
|
|
setvbuf(outf, buf, _IOLBF, BUFSIZ);
|
|
}
|
|
if (outfname && argv[0]) {
|
|
if (!opt_intr)
|
|
opt_intr = INTR_NEVER;
|
|
qflag = 1;
|
|
}
|
|
if (!opt_intr)
|
|
opt_intr = INTR_WHILE_WAIT;
|
|
|
|
/* argv[0] -pPID -oFILE Default interactive setting
|
|
* yes 0 0 INTR_WHILE_WAIT
|
|
* no 1 0 INTR_WHILE_WAIT
|
|
* yes 0 1 INTR_NEVER
|
|
* no 1 1 INTR_WHILE_WAIT
|
|
*/
|
|
|
|
/* STARTUP_CHILD must be called before the signal handlers get
|
|
installed below as they are inherited into the spawned process.
|
|
Also we do not need to be protected by them as during interruption
|
|
in the STARTUP_CHILD mode we kill the spawned process anyway. */
|
|
if (argv[0])
|
|
startup_child(argv);
|
|
|
|
sigemptyset(&empty_set);
|
|
sigemptyset(&blocked_set);
|
|
sa.sa_handler = SIG_IGN;
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_flags = 0;
|
|
sigaction(SIGTTOU, &sa, NULL); /* SIG_IGN */
|
|
sigaction(SIGTTIN, &sa, NULL); /* SIG_IGN */
|
|
if (opt_intr != INTR_ANYWHERE) {
|
|
if (opt_intr == INTR_BLOCK_TSTP_TOO)
|
|
sigaction(SIGTSTP, &sa, NULL); /* SIG_IGN */
|
|
/*
|
|
* In interactive mode (if no -o OUTFILE, or -p PID is used),
|
|
* fatal signals are blocked while syscall stop is processed,
|
|
* and acted on in between, when waiting for new syscall stops.
|
|
* In non-interactive mode, signals are ignored.
|
|
*/
|
|
if (opt_intr == INTR_WHILE_WAIT) {
|
|
sigaddset(&blocked_set, SIGHUP);
|
|
sigaddset(&blocked_set, SIGINT);
|
|
sigaddset(&blocked_set, SIGQUIT);
|
|
sigaddset(&blocked_set, SIGPIPE);
|
|
sigaddset(&blocked_set, SIGTERM);
|
|
sa.sa_handler = interrupt;
|
|
#ifdef SUNOS4
|
|
/* POSIX signals on sunos4.1 are a little broken. */
|
|
sa.sa_flags = SA_INTERRUPT;
|
|
#endif
|
|
}
|
|
/* SIG_IGN, or set handler for these */
|
|
sigaction(SIGHUP, &sa, NULL);
|
|
sigaction(SIGINT, &sa, NULL);
|
|
sigaction(SIGQUIT, &sa, NULL);
|
|
sigaction(SIGPIPE, &sa, NULL);
|
|
sigaction(SIGTERM, &sa, NULL);
|
|
}
|
|
#ifdef USE_PROCFS
|
|
sa.sa_handler = reaper;
|
|
sigaction(SIGCHLD, &sa, NULL);
|
|
#else
|
|
/* Make sure SIGCHLD has the default action so that waitpid
|
|
definitely works without losing track of children. The user
|
|
should not have given us a bogus state to inherit, but he might
|
|
have. Arguably we should detect SIG_IGN here and pass it on
|
|
to children, but probably noone really needs that. */
|
|
sa.sa_handler = SIG_DFL;
|
|
sigaction(SIGCHLD, &sa, NULL);
|
|
#endif /* USE_PROCFS */
|
|
|
|
if (pflag_seen || daemonized_tracer)
|
|
startup_attach();
|
|
|
|
if (trace() < 0)
|
|
exit(1);
|
|
|
|
cleanup();
|
|
fflush(NULL);
|
|
if (exit_code > 0xff) {
|
|
/* Child was killed by a signal, mimic that. */
|
|
exit_code &= 0xff;
|
|
signal(exit_code, SIG_DFL);
|
|
raise(exit_code);
|
|
/* Paranoia - what if this signal is not fatal?
|
|
Exit with 128 + signo then. */
|
|
exit_code += 128;
|
|
}
|
|
exit(exit_code);
|
|
}
|
|
|
|
static void
|
|
expand_tcbtab(void)
|
|
{
|
|
/* Allocate some more TCBs and expand the table.
|
|
We don't want to relocate the TCBs because our
|
|
callers have pointers and it would be a pain.
|
|
So tcbtab is a table of pointers. Since we never
|
|
free the TCBs, we allocate a single chunk of many. */
|
|
int i = tcbtabsize;
|
|
struct tcb *newtcbs = calloc(tcbtabsize, sizeof(newtcbs[0]));
|
|
struct tcb **newtab = realloc(tcbtab, tcbtabsize * 2 * sizeof(tcbtab[0]));
|
|
if (!newtab || !newtcbs)
|
|
die_out_of_memory();
|
|
tcbtabsize *= 2;
|
|
tcbtab = newtab;
|
|
while (i < tcbtabsize)
|
|
tcbtab[i++] = newtcbs++;
|
|
}
|
|
|
|
struct tcb *
|
|
alloc_tcb(int pid, int command_options_parsed)
|
|
{
|
|
int i;
|
|
struct tcb *tcp;
|
|
|
|
if (nprocs == tcbtabsize)
|
|
expand_tcbtab();
|
|
|
|
for (i = 0; i < tcbtabsize; i++) {
|
|
tcp = tcbtab[i];
|
|
if ((tcp->flags & TCB_INUSE) == 0) {
|
|
memset(tcp, 0, sizeof(*tcp));
|
|
tcp->pid = pid;
|
|
tcp->flags = TCB_INUSE;
|
|
tcp->outf = outf; /* Initialise to current out file */
|
|
#if SUPPORTED_PERSONALITIES > 1
|
|
tcp->currpers = current_personality;
|
|
#endif
|
|
#ifdef USE_PROCFS
|
|
tcp->pfd = -1;
|
|
#endif
|
|
nprocs++;
|
|
if (debug)
|
|
fprintf(stderr, "new tcb for pid %d, active tcbs:%d\n", tcp->pid, nprocs);
|
|
if (command_options_parsed)
|
|
newoutf(tcp);
|
|
return tcp;
|
|
}
|
|
}
|
|
error_msg_and_die("bug in alloc_tcb");
|
|
}
|
|
|
|
#ifdef USE_PROCFS
|
|
int
|
|
proc_open(struct tcb *tcp, int attaching)
|
|
{
|
|
char proc[32];
|
|
long arg;
|
|
#ifdef SVR4
|
|
int i;
|
|
sysset_t syscalls;
|
|
sigset_t signals;
|
|
fltset_t faults;
|
|
#endif
|
|
#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);
|
|
tcp->pfd = open(proc, O_WRONLY|O_EXCL);
|
|
if (tcp->pfd < 0) {
|
|
perror("strace: open(\"/proc/...\", ...)");
|
|
return -1;
|
|
}
|
|
set_cloexec_flag(tcp->pfd);
|
|
sprintf(proc, "/proc/%d/status", tcp->pid);
|
|
tcp->pfd_stat = open(proc, O_RDONLY|O_EXCL);
|
|
if (tcp->pfd_stat < 0) {
|
|
perror("strace: open(\"/proc/...\", ...)");
|
|
return -1;
|
|
}
|
|
set_cloexec_flag(tcp->pfd_stat);
|
|
sprintf(proc, "/proc/%d/as", tcp->pid);
|
|
tcp->pfd_as = open(proc, O_RDONLY|O_EXCL);
|
|
if (tcp->pfd_as < 0) {
|
|
perror("strace: open(\"/proc/...\", ...)");
|
|
return -1;
|
|
}
|
|
set_cloexec_flag(tcp->pfd_as);
|
|
#else
|
|
/* Open the process pseudo-file in /proc. */
|
|
# ifndef FREEBSD
|
|
sprintf(proc, "/proc/%d", tcp->pid);
|
|
tcp->pfd = open(proc, O_RDWR|O_EXCL);
|
|
# else
|
|
sprintf(proc, "/proc/%d/mem", tcp->pid);
|
|
tcp->pfd = open(proc, O_RDWR);
|
|
# endif
|
|
if (tcp->pfd < 0) {
|
|
perror("strace: open(\"/proc/...\", ...)");
|
|
return -1;
|
|
}
|
|
set_cloexec_flag(tcp->pfd);
|
|
#endif
|
|
#ifdef FREEBSD
|
|
sprintf(proc, "/proc/%d/regs", tcp->pid);
|
|
tcp->pfd_reg = open(proc, O_RDONLY);
|
|
if (tcp->pfd_reg < 0) {
|
|
perror("strace: open(\"/proc/.../regs\", ...)");
|
|
return -1;
|
|
}
|
|
if (cflag) {
|
|
sprintf(proc, "/proc/%d/status", tcp->pid);
|
|
tcp->pfd_status = open(proc, O_RDONLY);
|
|
if (tcp->pfd_status < 0) {
|
|
perror("strace: open(\"/proc/.../status\", ...)");
|
|
return -1;
|
|
}
|
|
} else
|
|
tcp->pfd_status = -1;
|
|
#endif /* FREEBSD */
|
|
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;
|
|
}
|
|
}
|
|
#ifndef FREEBSD
|
|
/* Stop the process so that we own the stop. */
|
|
if (IOCTL(tcp->pfd, PIOCSTOP, (char *)NULL) < 0) {
|
|
perror("strace: PIOCSTOP");
|
|
return -1;
|
|
}
|
|
#endif
|
|
#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 */
|
|
#ifndef FREEBSD
|
|
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;
|
|
}
|
|
#else /* FREEBSD */
|
|
/* just unset the PF_LINGER flag for the Run-on-Last-Close. */
|
|
if (ioctl(tcp->pfd, PIOCGFL, &arg) < 0) {
|
|
perror("PIOCGFL");
|
|
return -1;
|
|
}
|
|
arg &= ~PF_LINGER;
|
|
if (ioctl(tcp->pfd, PIOCSFL, arg) < 0) {
|
|
perror("PIOCSFL");
|
|
return -1;
|
|
}
|
|
#endif /* FREEBSD */
|
|
#endif /* !PIOCSET */
|
|
#ifndef FREEBSD
|
|
/* Enable all syscall entries we care about. */
|
|
premptyset(&syscalls);
|
|
for (i = 1; i < MAX_QUALS; ++i) {
|
|
if (i > (sizeof syscalls) * CHAR_BIT) break;
|
|
if (qual_flags[i] & QUAL_TRACE) praddset(&syscalls, i);
|
|
}
|
|
praddset(&syscalls, SYS_execve);
|
|
if (followfork) {
|
|
praddset(&syscalls, SYS_fork);
|
|
#ifdef SYS_forkall
|
|
praddset(&syscalls, SYS_forkall);
|
|
#endif
|
|
#ifdef SYS_fork1
|
|
praddset(&syscalls, SYS_fork1);
|
|
#endif
|
|
#ifdef SYS_rfork1
|
|
praddset(&syscalls, SYS_rfork1);
|
|
#endif
|
|
#ifdef SYS_rforkall
|
|
praddset(&syscalls, SYS_rforkall);
|
|
#endif
|
|
}
|
|
if (IOCTL(tcp->pfd, PIOCSENTRY, &syscalls) < 0) {
|
|
perror("PIOCSENTRY");
|
|
return -1;
|
|
}
|
|
/* Enable the syscall exits. */
|
|
if (IOCTL(tcp->pfd, PIOCSEXIT, &syscalls) < 0) {
|
|
perror("PIOSEXIT");
|
|
return -1;
|
|
}
|
|
/* Enable signals we care about. */
|
|
premptyset(&signals);
|
|
for (i = 1; i < MAX_QUALS; ++i) {
|
|
if (i > (sizeof signals) * CHAR_BIT) break;
|
|
if (qual_flags[i] & QUAL_SIGNAL) praddset(&signals, i);
|
|
}
|
|
if (IOCTL(tcp->pfd, PIOCSTRACE, &signals) < 0) {
|
|
perror("PIOCSTRACE");
|
|
return -1;
|
|
}
|
|
/* Enable faults we care about */
|
|
premptyset(&faults);
|
|
for (i = 1; i < MAX_QUALS; ++i) {
|
|
if (i > (sizeof faults) * CHAR_BIT) break;
|
|
if (qual_flags[i] & QUAL_FAULT) praddset(&faults, i);
|
|
}
|
|
if (IOCTL(tcp->pfd, PIOCSFAULT, &faults) < 0) {
|
|
perror("PIOCSFAULT");
|
|
return -1;
|
|
}
|
|
#else /* FREEBSD */
|
|
/* set events flags. */
|
|
arg = S_SIG | S_SCE | S_SCX;
|
|
if (ioctl(tcp->pfd, PIOCBIS, arg) < 0) {
|
|
perror("PIOCBIS");
|
|
return -1;
|
|
}
|
|
#endif /* FREEBSD */
|
|
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 */
|
|
#ifdef PRSABORT
|
|
/* The child is in a pause(), abort it. */
|
|
arg = PRSABORT;
|
|
if (IOCTL(tcp->pfd, PIOCRUN, &arg) < 0) {
|
|
perror("PIOCRUN");
|
|
return -1;
|
|
}
|
|
#endif
|
|
#endif /* !MIPS*/
|
|
#ifdef FREEBSD
|
|
/* wake up the child if it received the SIGSTOP */
|
|
kill(tcp->pid, SIGCONT);
|
|
#endif
|
|
for (;;) {
|
|
/* Wait for the child to do something. */
|
|
if (IOCTL_WSTOP(tcp) < 0) {
|
|
perror("PIOCWSTOP");
|
|
return -1;
|
|
}
|
|
if (tcp->status.PR_WHY == PR_SYSENTRY) {
|
|
tcp->flags &= ~TCB_INSYSCALL;
|
|
get_scno(tcp);
|
|
if (known_scno(tcp) == SYS_execve)
|
|
break;
|
|
}
|
|
/* Set it running: maybe execve will be next. */
|
|
#ifndef FREEBSD
|
|
arg = 0;
|
|
if (IOCTL(tcp->pfd, PIOCRUN, &arg) < 0)
|
|
#else
|
|
if (IOCTL(tcp->pfd, PIOCRUN, 0) < 0)
|
|
#endif
|
|
{
|
|
perror("PIOCRUN");
|
|
return -1;
|
|
}
|
|
#ifdef FREEBSD
|
|
/* handle the case where we "opened" the child before
|
|
it did the kill -STOP */
|
|
if (tcp->status.PR_WHY == PR_SIGNALLED &&
|
|
tcp->status.PR_WHAT == SIGSTOP)
|
|
kill(tcp->pid, SIGCONT);
|
|
#endif
|
|
}
|
|
}
|
|
#ifdef FREEBSD
|
|
else {
|
|
if (attaching < 2) {
|
|
/* We are attaching to an already running process.
|
|
* Try to figure out the state of the process in syscalls,
|
|
* to handle the first event well.
|
|
* This is done by having a look at the "wchan" property of the
|
|
* process, which tells where it is stopped (if it is). */
|
|
FILE * status;
|
|
char wchan[20]; /* should be enough */
|
|
|
|
sprintf(proc, "/proc/%d/status", tcp->pid);
|
|
status = fopen(proc, "r");
|
|
if (status &&
|
|
(fscanf(status, "%*s %*d %*d %*d %*d %*d,%*d %*s %*d,%*d"
|
|
"%*d,%*d %*d,%*d %19s", wchan) == 1) &&
|
|
strcmp(wchan, "nochan") && strcmp(wchan, "spread") &&
|
|
strcmp(wchan, "stopevent")) {
|
|
/* The process is asleep in the middle of a syscall.
|
|
Fake the syscall entry event */
|
|
tcp->flags &= ~(TCB_INSYSCALL|TCB_STARTUP);
|
|
tcp->status.PR_WHY = PR_SYSENTRY;
|
|
trace_syscall(tcp);
|
|
}
|
|
if (status)
|
|
fclose(status);
|
|
} /* otherwise it's a fork being followed */
|
|
}
|
|
#endif /* FREEBSD */
|
|
#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 /* USE_PROCFS */
|
|
|
|
static struct tcb *
|
|
pid2tcb(int pid)
|
|
{
|
|
int i;
|
|
|
|
if (pid <= 0)
|
|
return NULL;
|
|
|
|
for (i = 0; i < tcbtabsize; i++) {
|
|
struct tcb *tcp = tcbtab[i];
|
|
if (tcp->pid == pid && (tcp->flags & TCB_INUSE))
|
|
return tcp;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
#ifdef USE_PROCFS
|
|
|
|
static struct tcb *
|
|
first_used_tcb(void)
|
|
{
|
|
int i;
|
|
struct tcb *tcp;
|
|
for (i = 0; i < tcbtabsize; i++) {
|
|
tcp = tcbtab[i];
|
|
if (tcp->flags & TCB_INUSE)
|
|
return tcp;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct tcb *
|
|
pfd2tcb(int pfd)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < tcbtabsize; i++) {
|
|
struct tcb *tcp = tcbtab[i];
|
|
if (tcp->pfd != pfd)
|
|
continue;
|
|
if (tcp->flags & TCB_INUSE)
|
|
return tcp;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
#endif /* USE_PROCFS */
|
|
|
|
void
|
|
droptcb(struct tcb *tcp)
|
|
{
|
|
if (tcp->pid == 0)
|
|
return;
|
|
|
|
nprocs--;
|
|
if (debug)
|
|
fprintf(stderr, "dropped tcb for pid %d, %d remain\n", tcp->pid, nprocs);
|
|
|
|
#ifdef USE_PROCFS
|
|
if (tcp->pfd != -1) {
|
|
close(tcp->pfd);
|
|
tcp->pfd = -1;
|
|
# ifdef FREEBSD
|
|
if (tcp->pfd_reg != -1) {
|
|
close(tcp->pfd_reg);
|
|
tcp->pfd_reg = -1;
|
|
}
|
|
if (tcp->pfd_status != -1) {
|
|
close(tcp->pfd_status);
|
|
tcp->pfd_status = -1;
|
|
}
|
|
# endif
|
|
tcp->flags = 0; /* rebuild_pollv needs it */
|
|
rebuild_pollv();
|
|
}
|
|
#endif
|
|
|
|
if (outfname && followfork > 1 && tcp->outf)
|
|
fclose(tcp->outf);
|
|
|
|
memset(tcp, 0, sizeof(*tcp));
|
|
}
|
|
|
|
/* detach traced process; continue with sig
|
|
Never call DETACH twice on the same process as both unattached and
|
|
attached-unstopped processes give the same ESRCH. For unattached process we
|
|
would SIGSTOP it and wait for its SIGSTOP notification forever. */
|
|
|
|
static int
|
|
detach(struct tcb *tcp)
|
|
{
|
|
int error = 0;
|
|
#ifdef LINUX
|
|
int status, catch_sigstop;
|
|
#endif
|
|
|
|
if (tcp->flags & TCB_BPTSET)
|
|
clearbpt(tcp);
|
|
|
|
#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
|
|
/*
|
|
* We attached but possibly didn't see the expected SIGSTOP.
|
|
* We must catch exactly one as otherwise the detached process
|
|
* would be left stopped (process state T).
|
|
*/
|
|
catch_sigstop = (tcp->flags & TCB_IGNORE_ONE_SIGSTOP);
|
|
error = ptrace(PTRACE_DETACH, tcp->pid, (char *) 1, 0);
|
|
if (error == 0) {
|
|
/* On a clear day, you can see forever. */
|
|
}
|
|
else if (errno != ESRCH) {
|
|
/* Shouldn't happen. */
|
|
perror("detach: ptrace(PTRACE_DETACH, ...)");
|
|
}
|
|
else if (my_tkill(tcp->pid, 0) < 0) {
|
|
if (errno != ESRCH)
|
|
perror("detach: checking sanity");
|
|
}
|
|
else if (!catch_sigstop && my_tkill(tcp->pid, SIGSTOP) < 0) {
|
|
if (errno != ESRCH)
|
|
perror("detach: stopping child");
|
|
}
|
|
else
|
|
catch_sigstop = 1;
|
|
if (catch_sigstop) {
|
|
for (;;) {
|
|
#ifdef __WALL
|
|
if (wait4(tcp->pid, &status, __WALL, NULL) < 0) {
|
|
if (errno == ECHILD) /* Already gone. */
|
|
break;
|
|
if (errno != EINVAL) {
|
|
perror("detach: waiting");
|
|
break;
|
|
}
|
|
#endif /* __WALL */
|
|
/* No __WALL here. */
|
|
if (waitpid(tcp->pid, &status, 0) < 0) {
|
|
if (errno != ECHILD) {
|
|
perror("detach: waiting");
|
|
break;
|
|
}
|
|
#ifdef __WCLONE
|
|
/* If no processes, try clones. */
|
|
if (wait4(tcp->pid, &status, __WCLONE,
|
|
NULL) < 0) {
|
|
if (errno != ECHILD)
|
|
perror("detach: waiting");
|
|
break;
|
|
}
|
|
#endif /* __WCLONE */
|
|
}
|
|
#ifdef __WALL
|
|
}
|
|
#endif
|
|
if (!WIFSTOPPED(status)) {
|
|
/* Au revoir, mon ami. */
|
|
break;
|
|
}
|
|
if (WSTOPSIG(status) == SIGSTOP) {
|
|
ptrace_restart(PTRACE_DETACH, tcp, 0);
|
|
break;
|
|
}
|
|
error = ptrace_restart(PTRACE_CONT, tcp,
|
|
WSTOPSIG(status) == syscall_trap_sig ? 0
|
|
: WSTOPSIG(status));
|
|
if (error < 0)
|
|
break;
|
|
}
|
|
}
|
|
#endif /* LINUX */
|
|
|
|
#if defined(SUNOS4)
|
|
/* PTRACE_DETACH won't respect `sig' argument, so we post it here. */
|
|
error = ptrace_restart(PTRACE_DETACH, tcp, 0);
|
|
#endif /* SUNOS4 */
|
|
|
|
if (!qflag)
|
|
fprintf(stderr, "Process %u detached\n", tcp->pid);
|
|
|
|
droptcb(tcp);
|
|
|
|
return error;
|
|
}
|
|
|
|
#ifdef USE_PROCFS
|
|
|
|
static void reaper(int sig)
|
|
{
|
|
int pid;
|
|
int status;
|
|
|
|
while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
|
|
}
|
|
}
|
|
|
|
#endif /* USE_PROCFS */
|
|
|
|
static void
|
|
cleanup(void)
|
|
{
|
|
int i;
|
|
struct tcb *tcp;
|
|
int fatal_sig;
|
|
|
|
/* 'interrupted' is a volatile object, fetch it only once */
|
|
fatal_sig = interrupted;
|
|
if (!fatal_sig)
|
|
fatal_sig = SIGTERM;
|
|
|
|
for (i = 0; i < tcbtabsize; i++) {
|
|
tcp = tcbtab[i];
|
|
if (!(tcp->flags & TCB_INUSE))
|
|
continue;
|
|
if (debug)
|
|
fprintf(stderr,
|
|
"cleanup: looking at pid %u\n", tcp->pid);
|
|
if (printing_tcp &&
|
|
(!outfname || followfork < 2 || printing_tcp == tcp)) {
|
|
tprints(" <unfinished ...>\n");
|
|
printing_tcp = NULL;
|
|
}
|
|
if (tcp->flags & TCB_ATTACHED)
|
|
detach(tcp);
|
|
else {
|
|
kill(tcp->pid, SIGCONT);
|
|
kill(tcp->pid, fatal_sig);
|
|
}
|
|
}
|
|
if (cflag)
|
|
call_summary(outf);
|
|
}
|
|
|
|
static void
|
|
interrupt(int sig)
|
|
{
|
|
interrupted = sig;
|
|
}
|
|
|
|
#ifndef HAVE_STRERROR
|
|
|
|
#if !HAVE_DECL_SYS_ERRLIST
|
|
extern int sys_nerr;
|
|
extern char *sys_errlist[];
|
|
#endif /* HAVE_DECL_SYS_ERRLIST */
|
|
|
|
const char *
|
|
strerror(int err_no)
|
|
{
|
|
static char buf[64];
|
|
|
|
if (err_no < 1 || err_no >= sys_nerr) {
|
|
sprintf(buf, "Unknown error %d", err_no);
|
|
return buf;
|
|
}
|
|
return sys_errlist[err_no];
|
|
}
|
|
|
|
#endif /* HAVE_STERRROR */
|
|
|
|
#ifndef HAVE_STRSIGNAL
|
|
|
|
#if defined HAVE_SYS_SIGLIST && !defined HAVE_DECL_SYS_SIGLIST
|
|
extern char *sys_siglist[];
|
|
#endif
|
|
#if defined HAVE_SYS__SIGLIST && !defined HAVE_DECL__SYS_SIGLIST
|
|
extern char *_sys_siglist[];
|
|
#endif
|
|
|
|
const char *
|
|
strsignal(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 USE_PROCFS
|
|
|
|
static void
|
|
rebuild_pollv(void)
|
|
{
|
|
int i, j;
|
|
|
|
free(pollv);
|
|
pollv = malloc(nprocs * sizeof(pollv[0]));
|
|
if (!pollv)
|
|
die_out_of_memory();
|
|
|
|
for (i = j = 0; i < tcbtabsize; i++) {
|
|
struct tcb *tcp = tcbtab[i];
|
|
if (!(tcp->flags & TCB_INUSE))
|
|
continue;
|
|
pollv[j].fd = tcp->pfd;
|
|
pollv[j].events = POLLWANT;
|
|
j++;
|
|
}
|
|
if (j != nprocs) {
|
|
error_msg_and_die("proc miscount");
|
|
}
|
|
}
|
|
|
|
#ifndef HAVE_POLLABLE_PROCFS
|
|
|
|
static void
|
|
proc_poll_open(void)
|
|
{
|
|
int i;
|
|
|
|
if (pipe(proc_poll_pipe) < 0) {
|
|
perror_msg_and_die("pipe");
|
|
}
|
|
for (i = 0; i < 2; i++) {
|
|
set_cloexec_flag(proc_poll_pipe[i]);
|
|
}
|
|
}
|
|
|
|
static int
|
|
proc_poll(struct pollfd *pollv, int nfds, int timeout)
|
|
{
|
|
int i;
|
|
int n;
|
|
struct proc_pollfd pollinfo;
|
|
|
|
n = read(proc_poll_pipe[0], &pollinfo, sizeof(pollinfo));
|
|
if (n < 0)
|
|
return n;
|
|
if (n != sizeof(struct proc_pollfd)) {
|
|
error_msg_and_die("panic: short read: %d", n);
|
|
}
|
|
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(int sig)
|
|
{
|
|
}
|
|
|
|
static void
|
|
proc_poller(int pfd)
|
|
{
|
|
struct proc_pollfd pollinfo;
|
|
struct sigaction sa;
|
|
sigset_t blocked_set, empty_set;
|
|
int i;
|
|
int n;
|
|
struct rlimit rl;
|
|
#ifdef FREEBSD
|
|
struct procfs_status pfs;
|
|
#endif /* FREEBSD */
|
|
|
|
switch (fork()) {
|
|
case -1:
|
|
perror_msg_and_die("fork");
|
|
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_msg_and_die("getrlimit(RLIMIT_NOFILE, ...)");
|
|
}
|
|
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 (;;) {
|
|
#ifndef FREEBSD
|
|
if (ioctl(pfd, PIOCWSTOP, NULL) < 0)
|
|
#else
|
|
if (ioctl(pfd, PIOCWSTOP, &pfs) < 0)
|
|
#endif
|
|
{
|
|
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 && exiting(tcp))
|
|
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) {
|
|
error_msg_and_die("lost proc");
|
|
}
|
|
droptcb(tcp);
|
|
return -1;
|
|
}
|
|
if (pollv[j].revents & POLLWANT) {
|
|
last = j;
|
|
return pollv[j].fd;
|
|
}
|
|
}
|
|
error_msg_and_die("nothing ready");
|
|
}
|
|
|
|
static int
|
|
trace(void)
|
|
{
|
|
#ifdef POLL_HACK
|
|
struct tcb *in_syscall = NULL;
|
|
#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 = first_used_tcb();
|
|
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;
|
|
what = poll(&pv, 1, 1);
|
|
if (what < 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. */
|
|
tcp = pfd2tcb(pfd);
|
|
if (tcp == NULL) {
|
|
error_msg_and_die("unknown pfd: %u", pfd);
|
|
}
|
|
#ifdef POLL_HACK
|
|
FOUND:
|
|
#endif
|
|
/* Get the status of the process. */
|
|
if (!interrupted) {
|
|
#ifndef FREEBSD
|
|
ioctl_result = IOCTL_WSTOP(tcp);
|
|
#else /* FREEBSD */
|
|
/* Thanks to some scheduling mystery, the first poller
|
|
sometimes waits for the already processed end of fork
|
|
event. Doing a non blocking poll here solves the problem. */
|
|
if (proc_poll_pipe[0] != -1)
|
|
ioctl_result = IOCTL_STATUS(tcp);
|
|
else
|
|
ioctl_result = IOCTL_WSTOP(tcp);
|
|
#endif /* FREEBSD */
|
|
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;
|
|
#ifdef FREEBSD
|
|
case ENOTTY:
|
|
#endif
|
|
case ENOENT:
|
|
droptcb(tcp);
|
|
continue;
|
|
default:
|
|
perror_msg_and_die("PIOCWSTOP");
|
|
}
|
|
}
|
|
|
|
#ifdef FREEBSD
|
|
if ((tcp->flags & TCB_STARTUP) && (tcp->status.PR_WHY == PR_SYSEXIT)) {
|
|
/* discard first event for a syscall we never entered */
|
|
IOCTL(tcp->pfd, PIOCRUN, 0);
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
/* clear the just started flag */
|
|
tcp->flags &= ~TCB_STARTUP;
|
|
|
|
/* set current output file */
|
|
outf = tcp->outf;
|
|
curcol = tcp->curcol;
|
|
|
|
if (cflag) {
|
|
struct timeval stime;
|
|
#ifdef FREEBSD
|
|
char buf[1024];
|
|
int len;
|
|
|
|
len = pread(tcp->pfd_status, buf, sizeof(buf) - 1, 0);
|
|
if (len > 0) {
|
|
buf[len] = '\0';
|
|
sscanf(buf,
|
|
"%*s %*d %*d %*d %*d %*d,%*d %*s %*d,%*d %*d,%*d %ld,%ld",
|
|
&stime.tv_sec, &stime.tv_usec);
|
|
} else
|
|
stime.tv_sec = stime.tv_usec = 0;
|
|
#else /* !FREEBSD */
|
|
stime.tv_sec = tcp->status.pr_stime.tv_sec;
|
|
stime.tv_usec = tcp->status.pr_stime.tv_nsec/1000;
|
|
#endif /* !FREEBSD */
|
|
tv_sub(&tcp->dtime, &stime, &tcp->stime);
|
|
tcp->stime = stime;
|
|
}
|
|
what = tcp->status.PR_WHAT;
|
|
switch (tcp->status.PR_WHY) {
|
|
#ifndef FREEBSD
|
|
case PR_REQUESTED:
|
|
if (tcp->status.PR_FLAGS & PR_ASLEEP) {
|
|
tcp->status.PR_WHY = PR_SYSENTRY;
|
|
if (trace_syscall(tcp) < 0) {
|
|
error_msg_and_die("syscall trouble");
|
|
}
|
|
}
|
|
break;
|
|
#endif /* !FREEBSD */
|
|
case PR_SYSENTRY:
|
|
#ifdef POLL_HACK
|
|
in_syscall = tcp;
|
|
#endif
|
|
case PR_SYSEXIT:
|
|
if (trace_syscall(tcp) < 0) {
|
|
error_msg_and_die("syscall trouble");
|
|
}
|
|
break;
|
|
case PR_SIGNALLED:
|
|
if (cflag != CFLAG_ONLY_STATS
|
|
&& (qual_flags[what] & QUAL_SIGNAL)) {
|
|
printleader(tcp);
|
|
tprintf("--- %s (%s) ---\n",
|
|
signame(what), strsignal(what));
|
|
printing_tcp = NULL;
|
|
#ifdef PR_INFO
|
|
if (tcp->status.PR_INFO.si_signo == what) {
|
|
printleader(tcp);
|
|
tprints(" siginfo=");
|
|
printsiginfo(&tcp->status.PR_INFO, 1);
|
|
tprints("\n");
|
|
printing_tcp = NULL;
|
|
}
|
|
#endif
|
|
}
|
|
break;
|
|
case PR_FAULTED:
|
|
if (cflag != CFLAGS_ONLY_STATS
|
|
&& (qual_flags[what] & QUAL_FAULT)) {
|
|
printleader(tcp);
|
|
tprintf("=== FAULT %d ===\n", what);
|
|
printing_tcp = NULL;
|
|
}
|
|
break;
|
|
#ifdef FREEBSD
|
|
case 0: /* handle case we polled for nothing */
|
|
continue;
|
|
#endif
|
|
default:
|
|
error_msg_and_die("odd stop %d", tcp->status.PR_WHY);
|
|
break;
|
|
}
|
|
/* Remember current print column before continuing. */
|
|
tcp->curcol = curcol;
|
|
arg = 0;
|
|
#ifndef FREEBSD
|
|
if (IOCTL(tcp->pfd, PIOCRUN, &arg) < 0)
|
|
#else
|
|
if (IOCTL(tcp->pfd, PIOCRUN, 0) < 0)
|
|
#endif
|
|
{
|
|
perror_msg_and_die("PIOCRUN");
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#else /* !USE_PROCFS */
|
|
|
|
static int
|
|
trace(void)
|
|
{
|
|
#ifdef LINUX
|
|
struct rusage ru;
|
|
struct rusage *rup = cflag ? &ru : NULL;
|
|
# ifdef __WALL
|
|
static int wait4_options = __WALL;
|
|
# endif
|
|
#endif /* LINUX */
|
|
|
|
while (nprocs != 0) {
|
|
int pid;
|
|
int wait_errno;
|
|
int status, sig;
|
|
int stopped;
|
|
struct tcb *tcp;
|
|
unsigned event;
|
|
|
|
if (interrupted)
|
|
return 0;
|
|
if (interactive)
|
|
sigprocmask(SIG_SETMASK, &empty_set, NULL);
|
|
#ifdef LINUX
|
|
# ifdef __WALL
|
|
pid = wait4(-1, &status, wait4_options, rup);
|
|
if (pid < 0 && (wait4_options & __WALL) && errno == EINVAL) {
|
|
/* this kernel does not support __WALL */
|
|
wait4_options &= ~__WALL;
|
|
pid = wait4(-1, &status, wait4_options, rup);
|
|
}
|
|
if (pid < 0 && !(wait4_options & __WALL) && errno == ECHILD) {
|
|
/* most likely a "cloned" process */
|
|
pid = wait4(-1, &status, __WCLONE, rup);
|
|
if (pid < 0) {
|
|
perror_msg("wait4(__WCLONE) failed");
|
|
}
|
|
}
|
|
# else
|
|
pid = wait4(-1, &status, 0, rup);
|
|
# endif /* __WALL */
|
|
#endif /* LINUX */
|
|
#ifdef SUNOS4
|
|
pid = wait(&status);
|
|
#endif
|
|
wait_errno = errno;
|
|
if (interactive)
|
|
sigprocmask(SIG_BLOCK, &blocked_set, NULL);
|
|
|
|
if (pid < 0) {
|
|
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.
|
|
*/
|
|
return 0;
|
|
default:
|
|
errno = wait_errno;
|
|
perror("strace: wait");
|
|
return -1;
|
|
}
|
|
}
|
|
if (pid == popen_pid) {
|
|
if (WIFEXITED(status) || WIFSIGNALED(status))
|
|
popen_pid = 0;
|
|
continue;
|
|
}
|
|
|
|
event = ((unsigned)status >> 16);
|
|
if (debug) {
|
|
char buf[sizeof("WIFEXITED,exitcode=%u") + sizeof(int)*3 /*paranoia:*/ + 16];
|
|
#ifdef LINUX
|
|
if (event != 0) {
|
|
static const char *const event_names[] = {
|
|
[PTRACE_EVENT_CLONE] = "CLONE",
|
|
[PTRACE_EVENT_FORK] = "FORK",
|
|
[PTRACE_EVENT_VFORK] = "VFORK",
|
|
[PTRACE_EVENT_VFORK_DONE] = "VFORK_DONE",
|
|
[PTRACE_EVENT_EXEC] = "EXEC",
|
|
[PTRACE_EVENT_EXIT] = "EXIT",
|
|
};
|
|
const char *e;
|
|
if (event < ARRAY_SIZE(event_names))
|
|
e = event_names[event];
|
|
else {
|
|
sprintf(buf, "?? (%u)", event);
|
|
e = buf;
|
|
}
|
|
fprintf(stderr, " PTRACE_EVENT_%s", e);
|
|
}
|
|
#endif
|
|
strcpy(buf, "???");
|
|
if (WIFSIGNALED(status))
|
|
#ifdef WCOREDUMP
|
|
sprintf(buf, "WIFSIGNALED,%ssig=%s",
|
|
WCOREDUMP(status) ? "core," : "",
|
|
signame(WTERMSIG(status)));
|
|
#else
|
|
sprintf(buf, "WIFSIGNALED,sig=%s",
|
|
signame(WTERMSIG(status)));
|
|
#endif
|
|
if (WIFEXITED(status))
|
|
sprintf(buf, "WIFEXITED,exitcode=%u", WEXITSTATUS(status));
|
|
if (WIFSTOPPED(status))
|
|
sprintf(buf, "WIFSTOPPED,sig=%s", signame(WSTOPSIG(status)));
|
|
#ifdef WIFCONTINUED
|
|
if (WIFCONTINUED(status))
|
|
strcpy(buf, "WIFCONTINUED");
|
|
#endif
|
|
fprintf(stderr, " [wait(0x%04x) = %u] %s\n", status, pid, buf);
|
|
}
|
|
|
|
/* Look up 'pid' in our table. */
|
|
tcp = pid2tcb(pid);
|
|
|
|
#ifdef LINUX
|
|
/* Under Linux, execve changes pid to thread leader's pid,
|
|
* and we see this changed pid on EVENT_EXEC and later,
|
|
* execve sysexit. Leader "disappears" without exit
|
|
* notification. Let user know that, drop leader's tcb,
|
|
* and fix up pid in execve thread's tcb.
|
|
* Effectively, execve thread's tcb replaces leader's tcb.
|
|
*
|
|
* BTW, leader is 'stuck undead' (doesn't report WIFEXITED
|
|
* on exit syscall) in multithreaded programs exactly
|
|
* in order to handle this case.
|
|
*
|
|
* PTRACE_GETEVENTMSG returns old pid starting from Linux 3.0.
|
|
* On 2.6 and earlier, it can return garbage.
|
|
*/
|
|
if (event == PTRACE_EVENT_EXEC && os_release[0] >= '3') {
|
|
long old_pid = 0;
|
|
if (ptrace(PTRACE_GETEVENTMSG, pid, NULL, (long) &old_pid) >= 0
|
|
&& old_pid > 0
|
|
&& old_pid != pid
|
|
) {
|
|
struct tcb *execve_thread = pid2tcb(old_pid);
|
|
if (tcp) {
|
|
outf = tcp->outf;
|
|
curcol = tcp->curcol;
|
|
if (!cflag) {
|
|
if (printing_tcp)
|
|
tprints(" <unfinished ...>\n");
|
|
printleader(tcp);
|
|
tprintf("+++ superseded by execve in pid %lu +++\n", old_pid);
|
|
printing_tcp = NULL;
|
|
fflush(outf);
|
|
}
|
|
if (execve_thread) {
|
|
/* swap output FILEs (needed for -ff) */
|
|
tcp->outf = execve_thread->outf;
|
|
execve_thread->outf = outf;
|
|
}
|
|
droptcb(tcp);
|
|
}
|
|
tcp = execve_thread;
|
|
if (tcp) {
|
|
tcp->pid = pid;
|
|
tcp->flags |= TCB_REPRINT;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (tcp == NULL) {
|
|
#ifdef LINUX
|
|
if (followfork) {
|
|
/* This is needed to go with the CLONE_PTRACE
|
|
changes in process.c/util.c: we might see
|
|
the child's initial trap before we see the
|
|
parent return from the clone syscall.
|
|
Leave the child suspended until the parent
|
|
returns from its system call. Only then
|
|
will we have the association of parent and
|
|
child so that we know how to do clearbpt
|
|
in the child. */
|
|
tcp = alloctcb(pid);
|
|
tcp->flags |= TCB_ATTACHED | TCB_STARTUP | post_attach_sigstop;
|
|
if (!qflag)
|
|
fprintf(stderr, "Process %d attached\n",
|
|
pid);
|
|
}
|
|
else
|
|
/* This can happen if a clone call used
|
|
CLONE_PTRACE itself. */
|
|
#endif
|
|
{
|
|
if (WIFSTOPPED(status))
|
|
ptrace(PTRACE_CONT, pid, (char *) 1, 0);
|
|
error_msg_and_die("Unknown pid: %u", pid);
|
|
}
|
|
}
|
|
/* set current output file */
|
|
outf = tcp->outf;
|
|
curcol = tcp->curcol;
|
|
#ifdef LINUX
|
|
if (cflag) {
|
|
tv_sub(&tcp->dtime, &ru.ru_stime, &tcp->stime);
|
|
tcp->stime = ru.ru_stime;
|
|
}
|
|
#endif
|
|
|
|
if (WIFSIGNALED(status)) {
|
|
if (pid == strace_child)
|
|
exit_code = 0x100 | WTERMSIG(status);
|
|
if (cflag != CFLAG_ONLY_STATS
|
|
&& (qual_flags[WTERMSIG(status)] & QUAL_SIGNAL)) {
|
|
printleader(tcp);
|
|
#ifdef WCOREDUMP
|
|
tprintf("+++ killed by %s %s+++\n",
|
|
signame(WTERMSIG(status)),
|
|
WCOREDUMP(status) ? "(core dumped) " : "");
|
|
#else
|
|
tprintf("+++ killed by %s +++\n",
|
|
signame(WTERMSIG(status)));
|
|
#endif
|
|
printing_tcp = NULL;
|
|
}
|
|
fflush(tcp->outf);
|
|
droptcb(tcp);
|
|
continue;
|
|
}
|
|
if (WIFEXITED(status)) {
|
|
if (pid == strace_child)
|
|
exit_code = WEXITSTATUS(status);
|
|
if (tcp == printing_tcp) {
|
|
tprints(" <unfinished ...>\n");
|
|
printing_tcp = NULL;
|
|
}
|
|
if (!cflag /* && (qual_flags[WTERMSIG(status)] & QUAL_SIGNAL) */ ) {
|
|
printleader(tcp);
|
|
tprintf("+++ exited with %d +++\n", WEXITSTATUS(status));
|
|
printing_tcp = NULL;
|
|
}
|
|
fflush(tcp->outf);
|
|
droptcb(tcp);
|
|
continue;
|
|
}
|
|
if (!WIFSTOPPED(status)) {
|
|
fprintf(stderr, "PANIC: pid %u not stopped\n", pid);
|
|
droptcb(tcp);
|
|
continue;
|
|
}
|
|
|
|
/* Is this the very first time we see this tracee stopped? */
|
|
if (tcp->flags & TCB_STARTUP) {
|
|
if (debug)
|
|
fprintf(stderr, "pid %d has TCB_STARTUP, initializing it\n", tcp->pid);
|
|
tcp->flags &= ~TCB_STARTUP;
|
|
if (tcp->flags & TCB_BPTSET) {
|
|
/*
|
|
* One example is a breakpoint inherited from
|
|
* parent through fork().
|
|
*/
|
|
if (clearbpt(tcp) < 0) {
|
|
/* Pretty fatal */
|
|
droptcb(tcp);
|
|
cleanup();
|
|
return -1;
|
|
}
|
|
}
|
|
#ifdef LINUX
|
|
if (ptrace_setoptions) {
|
|
if (debug)
|
|
fprintf(stderr, "setting opts %x on pid %d\n", ptrace_setoptions, tcp->pid);
|
|
if (ptrace(PTRACE_SETOPTIONS, tcp->pid, NULL, ptrace_setoptions) < 0) {
|
|
if (errno != ESRCH) {
|
|
/* Should never happen, really */
|
|
perror_msg_and_die("PTRACE_SETOPTIONS");
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
sig = WSTOPSIG(status);
|
|
|
|
if (event != 0) {
|
|
/* Ptrace event */
|
|
#ifdef USE_SEIZE
|
|
if (event == PTRACE_EVENT_STOP || event == PTRACE_EVENT_STOP1) {
|
|
/*
|
|
* PTRACE_INTERRUPT-stop or group-stop.
|
|
* PTRACE_INTERRUPT-stop has sig == SIGTRAP here.
|
|
*/
|
|
if (sig == SIGSTOP
|
|
|| sig == SIGTSTP
|
|
|| sig == SIGTTIN
|
|
|| sig == SIGTTOU
|
|
) {
|
|
stopped = 1;
|
|
goto show_stopsig;
|
|
}
|
|
}
|
|
#endif
|
|
goto restart_tracee_with_sig_0;
|
|
}
|
|
|
|
/* Is this post-attach SIGSTOP?
|
|
* 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 (sig == SIGSTOP && (tcp->flags & TCB_IGNORE_ONE_SIGSTOP)) {
|
|
if (debug)
|
|
fprintf(stderr, "ignored SIGSTOP on pid %d\n", tcp->pid);
|
|
tcp->flags &= ~TCB_IGNORE_ONE_SIGSTOP;
|
|
goto restart_tracee_with_sig_0;
|
|
}
|
|
|
|
if (sig != syscall_trap_sig) {
|
|
siginfo_t si;
|
|
|
|
/* Nonzero (true) if tracee is stopped by signal
|
|
* (as opposed to "tracee received signal").
|
|
*/
|
|
stopped = (ptrace(PTRACE_GETSIGINFO, pid, 0, (long) &si) < 0);
|
|
#ifdef USE_SEIZE
|
|
show_stopsig:
|
|
#endif
|
|
if (cflag != CFLAG_ONLY_STATS
|
|
&& (qual_flags[sig] & QUAL_SIGNAL)) {
|
|
#if defined(PT_CR_IPSR) && defined(PT_CR_IIP)
|
|
long pc = 0;
|
|
long psr = 0;
|
|
|
|
upeek(tcp, PT_CR_IPSR, &psr);
|
|
upeek(tcp, PT_CR_IIP, &pc);
|
|
|
|
# define PSR_RI 41
|
|
pc += (psr >> PSR_RI) & 0x3;
|
|
# define PC_FORMAT_STR " @ %lx"
|
|
# define PC_FORMAT_ARG , pc
|
|
#else
|
|
# define PC_FORMAT_STR ""
|
|
# define PC_FORMAT_ARG /* nothing */
|
|
#endif
|
|
printleader(tcp);
|
|
if (!stopped) {
|
|
tprints("--- ");
|
|
printsiginfo(&si, verbose(tcp));
|
|
tprintf(" (%s)" PC_FORMAT_STR " ---\n",
|
|
strsignal(sig)
|
|
PC_FORMAT_ARG);
|
|
} else
|
|
tprintf("--- %s by %s" PC_FORMAT_STR " ---\n",
|
|
strsignal(sig),
|
|
signame(sig)
|
|
PC_FORMAT_ARG);
|
|
printing_tcp = NULL;
|
|
fflush(tcp->outf);
|
|
}
|
|
|
|
if (!stopped)
|
|
/* It's signal-delivery-stop. Inject the signal */
|
|
goto restart_tracee;
|
|
|
|
/* It's group-stop */
|
|
#ifdef USE_SEIZE
|
|
if (use_seize) {
|
|
/*
|
|
* This ends ptrace-stop, but does *not* end group-stop.
|
|
* This makes stopping signals work properly on straced process
|
|
* (that is, process really stops. It used to continue to run).
|
|
*/
|
|
if (ptrace_restart(PTRACE_LISTEN, tcp, 0) < 0) {
|
|
cleanup();
|
|
return -1;
|
|
}
|
|
continue;
|
|
}
|
|
/* We don't have PTRACE_LISTEN support... */
|
|
#endif
|
|
goto restart_tracee;
|
|
}
|
|
|
|
/* We handled quick cases, we are permitted to interrupt now. */
|
|
if (interrupted)
|
|
return 0;
|
|
|
|
/* This should be syscall entry or exit.
|
|
* (Or it still can be that pesky post-execve SIGTRAP!)
|
|
* Handle it.
|
|
*/
|
|
if (trace_syscall(tcp) < 0 && !tcp->ptrace_errno) {
|
|
/* ptrace() failed in trace_syscall() with ESRCH.
|
|
* Likely a result of process disappearing mid-flight.
|
|
* Observed case: exit_group() terminating
|
|
* all processes in thread group.
|
|
*/
|
|
if (tcp->flags & TCB_ATTACHED) {
|
|
if (printing_tcp) {
|
|
/* Do we have dangling line "syscall(param, param"?
|
|
* Finish the line then.
|
|
*/
|
|
printing_tcp->flags |= TCB_REPRINT;
|
|
tprints(" <unfinished ...>\n");
|
|
printing_tcp = NULL;
|
|
fflush(tcp->outf);
|
|
}
|
|
/* We assume that ptrace error was caused by process death.
|
|
* We used to detach(tcp) here, but since we no longer
|
|
* implement "detach before death" policy/hack,
|
|
* we can let this process to report its death to us
|
|
* normally, via WIFEXITED or WIFSIGNALED wait status.
|
|
*/
|
|
} else {
|
|
/* It's our real child (and we also trace it) */
|
|
/* my_tkill(pid, SIGKILL); - why? */
|
|
/* droptcb(tcp); - why? */
|
|
}
|
|
continue;
|
|
}
|
|
restart_tracee_with_sig_0:
|
|
sig = 0;
|
|
restart_tracee:
|
|
/* Remember current print column before continuing. */
|
|
tcp->curcol = curcol;
|
|
if (ptrace_restart(PTRACE_SYSCALL, tcp, sig) < 0) {
|
|
cleanup();
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#endif /* !USE_PROCFS */
|
|
|
|
void
|
|
tprintf(const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
|
|
va_start(args, fmt);
|
|
if (outf) {
|
|
int n = vfprintf(outf, fmt, args);
|
|
if (n < 0) {
|
|
if (outf != stderr)
|
|
perror(outfname == NULL
|
|
? "<writing to pipe>" : outfname);
|
|
} else
|
|
curcol += n;
|
|
}
|
|
va_end(args);
|
|
}
|
|
|
|
void
|
|
tprints(const char *str)
|
|
{
|
|
if (outf) {
|
|
int n = fputs(str, outf);
|
|
if (n >= 0) {
|
|
curcol += strlen(str);
|
|
return;
|
|
}
|
|
if (outf != stderr)
|
|
perror(outfname == NULL
|
|
? "<writing to pipe>" : outfname);
|
|
}
|
|
}
|
|
|
|
void
|
|
printleader(struct tcb *tcp)
|
|
{
|
|
if (printing_tcp) {
|
|
if (printing_tcp->ptrace_errno) {
|
|
if (printing_tcp->flags & TCB_INSYSCALL) {
|
|
tprints(" <unavailable>) ");
|
|
tabto();
|
|
}
|
|
tprints("= ? <unavailable>\n");
|
|
printing_tcp->ptrace_errno = 0;
|
|
} else if (!outfname || followfork < 2 || printing_tcp == tcp) {
|
|
printing_tcp->flags |= TCB_REPRINT;
|
|
tprints(" <unfinished ...>\n");
|
|
}
|
|
}
|
|
|
|
printing_tcp = tcp;
|
|
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(void)
|
|
{
|
|
if (curcol < acolumn)
|
|
tprints(acolumn_spaces + curcol);
|
|
}
|
|
|
|
#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
|