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 #pragma clang diagnostic push
  31 #pragma clang diagnostic ignored "-Wstrict-prototypes"
  32
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 static char sccsid[] = "@(#)abort.c     8.1 (Berkeley) 6/4/93";
  35 #endif /* LIBC_SCCS and not lint */
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD: src/lib/libc/stdlib/abort.c,v 1.11 2007/01/09 00:28:09 imp Exp $");
  38
  39 #include "namespace.h"
  40 #include <signal.h>
  41 #include <stdarg.h>
  42 #include <stdlib.h>
  43 #include <stddef.h>
  44 #include <unistd.h>
  45 #include <pthread.h>
  46 #include <pthread_workqueue.h>
  47 #include "un-namespace.h"
  48
  49 #include "libc_private.h"
  50
  51 #include <CrashReporterClient.h>
  52 #include "_simple.h"
  53
  54 extern void (*__cleanup)();
  55 extern void __abort(void) __dead2;
  56
  57 #define TIMEOUT 10000   /* 10 milliseconds */
  58
  59 void
  60 abort()
  61 {
  62         struct sigaction act;
  63
  64         if (!CRGetCrashLogMessage())
  65                 CRSetCrashLogMessage("abort() called");
  66
  67         /*
  68          * POSIX requires we flush stdio buffers on abort.
  69          * XXX ISO C requires that abort() be async-signal-safe.
  70          */
  71         if (__cleanup)
  72                 (*__cleanup)();
  73
  74         sigfillset(&act.sa_mask);
  75         /*
  76          * Don't block SIGABRT to give any handler a chance; we ignore
  77          * any errors -- ISO C doesn't allow abort to return anyway.
  78          */
  79         sigdelset(&act.sa_mask, SIGABRT);
  80
  81         /* <rdar://problem/7397932> abort() should call pthread_kill to deliver a signal to the aborting thread
  82          * This helps gdb focus on the thread calling abort()
  83          */
  84
  85         /* Block all signals on all other threads */
  86         sigset_t fullmask;
  87         sigfillset(&fullmask);
  88         (void)_sigprocmask(SIG_SETMASK, &fullmask, NULL);
  89
  90         /* <rdar://problem/8400096> Set the workqueue killable */
  91         __pthread_workqueue_setkill(1);
  92
  93         (void)pthread_sigmask(SIG_SETMASK, &act.sa_mask, NULL);
  94         (void)pthread_kill(pthread_self(), SIGABRT);
  95
  96         usleep(TIMEOUT); /* give time for signal to happen */
  97
  98         /*
  99          * If SIGABRT was ignored, or caught and the handler returns, do
 100          * it again, only harder.
 101          */
 102          __abort();
 103 }
 104
 105 __private_extern__ void
 106 __abort()
 107 {
 108         struct sigaction act;
 109
 110         if (!CRGetCrashLogMessage())
 111                 CRSetCrashLogMessage("__abort() called");
 112         act.sa_handler = SIG_DFL;
 113         act.sa_flags = 0;
 114         sigfillset(&act.sa_mask);
 115         (void)_sigaction(SIGABRT, &act, NULL);
 116         sigdelset(&act.sa_mask, SIGABRT);
 117
 118         /* <rdar://problem/7397932> abort() should call pthread_kill to deliver a signal to the aborting thread
 119          * This helps gdb focus on the thread calling abort()
 120          */
 121
 122         /* Block all signals on all other threads */
 123         sigset_t fullmask;
 124         sigfillset(&fullmask);
 125         (void)_sigprocmask(SIG_SETMASK, &fullmask, NULL);
 126
 127         /* <rdar://problem/8400096> Set the workqueue killable */
 128         __pthread_workqueue_setkill(1);
 129
 130         (void)pthread_sigmask(SIG_SETMASK, &act.sa_mask, NULL);
 131         (void)pthread_kill(pthread_self(), SIGABRT);
 132
 133         usleep(TIMEOUT); /* give time for signal to happen */
 134
 135         /* If for some reason SIGABRT was not delivered, we exit using __builtin_trap
 136          * which generates an illegal instruction on i386: <rdar://problem/8400958>
 137          * and SIGTRAP on arm.
 138          */
 139         sigfillset(&act.sa_mask);
 140         sigdelset(&act.sa_mask, SIGILL);
 141         sigdelset(&act.sa_mask, SIGTRAP);
 142         (void)_sigprocmask(SIG_SETMASK, &act.sa_mask, NULL);
 143         __builtin_trap();
 144 }
 145
 146 void
 147 abort_report_np(const char *fmt, ...)
 148 {
 149         _SIMPLE_STRING s;
 150         va_list ap;
 151
 152         if ((s = _simple_salloc()) != NULL) {
 153                 va_start(ap, fmt);
 154                 _simple_vsprintf(s, fmt, ap);
 155                 va_end(ap);
 156                 CRSetCrashLogMessage(_simple_string(s));
 157         } else
 158                 CRSetCrashLogMessage(fmt); /* the format string is better than nothing */
 159         abort();
 160 }
 161 #pragma clang diagnostic pop