stdlib/FreeBSD/abort.c

   1 /*
   2  * Copyright (c) 1985, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31 static char sccsid[] = "@(#)abort.c     8.1 (Berkeley) 6/4/93";
  32 #endif /* LIBC_SCCS and not lint */
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD: src/lib/libc/stdlib/abort.c,v 1.11 2007/01/09 00:28:09 imp Exp $");
  35
  36 #include "namespace.h"
  37 #include <signal.h>
  38 #include <stdarg.h>
  39 #include <stdlib.h>
  40 #include <stddef.h>
  41 #include <unistd.h>
  42 #include <pthread.h>
  43 #include "un-namespace.h"
  44
  45 #include "libc_private.h"
  46
  47 #include "CrashReporterClient.h"
  48 #include "_simple.h"
  49
  50 extern void (*__cleanup)();
  51 extern void __abort(void) __dead2;
  52
  53 #define TIMEOUT 10000   /* 10 milliseconds */
  54
  55 void
  56 abort()
  57 {
  58         struct sigaction act;
  59
  60         if (!CRGetCrashLogMessage())
  61                 CRSetCrashLogMessage("abort() called");
  62
  63         /*
  64          * POSIX requires we flush stdio buffers on abort.
  65          * XXX ISO C requires that abort() be async-signal-safe.
  66          */
  67         if (__cleanup)
  68                 (*__cleanup)();
  69
  70         sigfillset(&act.sa_mask);
  71         /*
  72          * Don't block SIGABRT to give any handler a chance; we ignore
  73          * any errors -- ISO C doesn't allow abort to return anyway.
  74          */
  75         sigdelset(&act.sa_mask, SIGABRT);
  76
  77         /* <rdar://problem/7397932> abort() should call pthread_kill to deliver a signal to the aborting thread
  78          * This helps gdb focus on the thread calling abort()
  79          */
  80         if (__is_threaded) {
  81             /* Block all signals on all other threads */
  82             sigset_t fullmask;
  83             sigfillset(&fullmask);
  84             (void)_sigprocmask(SIG_SETMASK, &fullmask, NULL);
  85
  86             /* <rdar://problem/8400096> Set the workqueue killable */
  87             __pthread_workqueue_setkill(1);
  88
  89             (void)pthread_sigmask(SIG_SETMASK, &act.sa_mask, NULL);
  90             (void)pthread_kill(pthread_self(), SIGABRT);
  91         } else {
  92             (void)_sigprocmask(SIG_SETMASK, &act.sa_mask, NULL);
  93             (void)kill(getpid(), SIGABRT);
  94         }
  95         usleep(TIMEOUT); /* give time for signal to happen */
  96
  97         /*
  98          * If SIGABRT was ignored, or caught and the handler returns, do
  99          * it again, only harder.
 100          */
 101          __abort();
 102 }
 103
 104 __private_extern__ void
 105 __abort()
 106 {
 107         struct sigaction act;
 108
 109         if (!CRGetCrashLogMessage())
 110                 CRSetCrashLogMessage("__abort() called");
 111         act.sa_handler = SIG_DFL;
 112         act.sa_flags = 0;
 113         sigfillset(&act.sa_mask);
 114         (void)_sigaction(SIGABRT, &act, NULL);
 115         sigdelset(&act.sa_mask, SIGABRT);
 116
 117         /* <rdar://problem/7397932> abort() should call pthread_kill to deliver a signal to the aborting thread
 118          * This helps gdb focus on the thread calling abort()
 119          */
 120         if (__is_threaded) {
 121             /* Block all signals on all other threads */
 122             sigset_t fullmask;
 123             sigfillset(&fullmask);
 124             (void)_sigprocmask(SIG_SETMASK, &fullmask, NULL);
 125
 126             /* <rdar://problem/8400096> Set the workqueue killable */
 127             __pthread_workqueue_setkill(1);
 128
 129             (void)pthread_sigmask(SIG_SETMASK, &act.sa_mask, NULL);
 130             (void)pthread_kill(pthread_self(), SIGABRT);
 131         } else {
 132             (void)_sigprocmask(SIG_SETMASK, &act.sa_mask, NULL);
 133             (void)kill(getpid(), SIGABRT);
 134         }
 135         usleep(TIMEOUT); /* give time for signal to happen */
 136
 137         /* If for some reason SIGABRT was not delivered, we exit using __builtin_trap
 138          * which generates an illegal instruction on i386: <rdar://problem/8400958>
 139          * and SIGTRAP on arm.
 140          */
 141         sigfillset(&act.sa_mask);
 142         sigdelset(&act.sa_mask, SIGILL);
 143         sigdelset(&act.sa_mask, SIGTRAP);
 144         (void)_sigprocmask(SIG_SETMASK, &act.sa_mask, NULL);
 145         __builtin_trap();
 146 }
 147
 148 __private_extern__ void
 149 abort_report_np(const char *fmt, ...)
 150 {
 151         _SIMPLE_STRING s;
 152         va_list ap;
 153
 154         if ((s = _simple_salloc()) != NULL) {
 155                 va_start(ap, fmt);
 156                 _simple_vsprintf(s, fmt, ap);
 157                 va_end(ap);
 158                 CRSetCrashLogMessage(_simple_string(s));
 159         } else
 160                 CRSetCrashLogMessage(fmt); /* the format string is better than nothing */
 161         abort();
 162 }