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 <pthread_workqueue.h>
  44 #include "un-namespace.h"
  45
  46 #include "libc_private.h"
  47
  48 #include <CrashReporterClient.h>
  49 #include "_simple.h"
  50
  51 extern void (*__cleanup)();
  52 extern void __abort(void) __dead2;
  53
  54 #define TIMEOUT 10000   /* 10 milliseconds */
  55
  56 void
  57 abort()
  58 {
  59         struct sigaction act;
  60
  61         if (!CRGetCrashLogMessage())
  62                 CRSetCrashLogMessage("abort() called");
  63
  64         /*
  65          * POSIX requires we flush stdio buffers on abort.
  66          * XXX ISO C requires that abort() be async-signal-safe.
  67          */
  68         if (__cleanup)
  69                 (*__cleanup)();
  70
  71         sigfillset(&act.sa_mask);
  72         /*
  73          * Don't block SIGABRT to give any handler a chance; we ignore
  74          * any errors -- ISO C doesn't allow abort to return anyway.
  75          */
  76         sigdelset(&act.sa_mask, SIGABRT);
  77
  78         /* <rdar://problem/7397932> abort() should call pthread_kill to deliver a signal to the aborting thread
  79          * This helps gdb focus on the thread calling abort()
  80          */
  81
  82         /* Block all signals on all other threads */
  83         sigset_t fullmask;
  84         sigfillset(&fullmask);
  85         (void)_sigprocmask(SIG_SETMASK, &fullmask, NULL);
  86
  87         /* <rdar://problem/8400096> Set the workqueue killable */
  88         __pthread_workqueue_setkill(1);
  89
  90         (void)pthread_sigmask(SIG_SETMASK, &act.sa_mask, NULL);
  91         (void)pthread_kill(pthread_self(), SIGABRT);
  92
  93         usleep(TIMEOUT); /* give time for signal to happen */
  94
  95         /*
  96          * If SIGABRT was ignored, or caught and the handler returns, do
  97          * it again, only harder.
  98          */
  99          __abort();
 100 }
 101
 102 __private_extern__ void
 103 __abort()
 104 {
 105         struct sigaction act;
 106
 107         if (!CRGetCrashLogMessage())
 108                 CRSetCrashLogMessage("__abort() called");
 109         act.sa_handler = SIG_DFL;
 110         act.sa_flags = 0;
 111         sigfillset(&act.sa_mask);
 112         (void)_sigaction(SIGABRT, &act, NULL);
 113         sigdelset(&act.sa_mask, SIGABRT);
 114
 115         /* <rdar://problem/7397932> abort() should call pthread_kill to deliver a signal to the aborting thread
 116          * This helps gdb focus on the thread calling abort()
 117          */
 118
 119         /* Block all signals on all other threads */
 120         sigset_t fullmask;
 121         sigfillset(&fullmask);
 122         (void)_sigprocmask(SIG_SETMASK, &fullmask, NULL);
 123
 124         /* <rdar://problem/8400096> Set the workqueue killable */
 125         __pthread_workqueue_setkill(1);
 126
 127         (void)pthread_sigmask(SIG_SETMASK, &act.sa_mask, NULL);
 128         (void)pthread_kill(pthread_self(), SIGABRT);
 129
 130         usleep(TIMEOUT); /* give time for signal to happen */
 131
 132         /* If for some reason SIGABRT was not delivered, we exit using __builtin_trap
 133          * which generates an illegal instruction on i386: <rdar://problem/8400958>
 134          * and SIGTRAP on arm.
 135          */
 136         sigfillset(&act.sa_mask);
 137         sigdelset(&act.sa_mask, SIGILL);
 138         sigdelset(&act.sa_mask, SIGTRAP);
 139         (void)_sigprocmask(SIG_SETMASK, &act.sa_mask, NULL);
 140         __builtin_trap();
 141 }
 142
 143 void
 144 abort_report_np(const char *fmt, ...)
 145 {
 146         _SIMPLE_STRING s;
 147         va_list ap;
 148
 149         if ((s = _simple_salloc()) != NULL) {
 150                 va_start(ap, fmt);
 151                 _simple_vsprintf(s, fmt, ap);
 152                 va_end(ap);
 153                 CRSetCrashLogMessage(_simple_string(s));
 154         } else
 155                 CRSetCrashLogMessage(fmt); /* the format string is better than nothing */
 156         abort();
 157 }