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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)abort.c     8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD: src/lib/libc/stdlib/abort.c,v 1.8 2002/07/10 16:35:02 wollman Exp $");
  39
  40 #include <signal.h>
  41 #include <stdlib.h>
  42 #include <stddef.h>
  43 #include <unistd.h>
  44 #include <pthread.h>
  45
  46 void (*__cleanup)();
  47
  48 /* XXX - why are these declarations here? */
  49 extern int      __sys_sigprocmask(int, const sigset_t *, sigset_t *);
  50 extern int      __sys_sigaction(int, const struct sigaction *,
  51                     struct sigaction *);
  52
  53 void
  54 abort()
  55 {
  56         struct sigaction act;
  57
  58         /*
  59          * POSIX requires we flush stdio buffers on abort.
  60          * XXX ISO C requires that abort() be async-signal-safe.
  61          */
  62         if (__cleanup)
  63                 (*__cleanup)();
  64
  65         sigfillset(&act.sa_mask);
  66         /*
  67          * Don't block SIGABRT to give any handler a chance; we ignore
  68          * any errors -- ISO C doesn't allow abort to return anyway.
  69          */
  70         sigdelset(&act.sa_mask, SIGABRT);
  71         (void)__sys_sigprocmask(SIG_SETMASK, &act.sa_mask, NULL);
  72         (void)kill(getpid(), SIGABRT);
  73
  74         /*
  75          * If SIGABRT was ignored, or caught and the handler returns, do
  76          * it again, only harder.
  77          */
  78         act.sa_handler = SIG_DFL;
  79         act.sa_flags = 0;
  80         sigfillset(&act.sa_mask);
  81         (void)__sys_sigaction(SIGABRT, &act, NULL);
  82         sigdelset(&act.sa_mask, SIGABRT);
  83         (void)__sys_sigprocmask(SIG_SETMASK, &act.sa_mask, NULL);
  84         (void)kill(getpid(), SIGABRT);
  85         exit(1);
  86 }