sysdeps/generic/abort.c

   1 /* Copyright (C) 1991, 1993, 1995, 1996 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <signal.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <unistd.h>
  23 #include <signal.h>
  24
  25
  26 /* Function to close all streams and also make sure we don't loop by
  27    calling abort while closing the streams.  */
  28 extern void __close_all_streams (void);
  29
  30
  31 /* Cause an abnormal program termination with core-dump.  */
  32 void
  33 abort (void)
  34 {
  35   struct sigaction act;
  36   sigset_t sigs;
  37
  38   if (__sigemptyset (&sigs) == 0 &&
  39       __sigaddset (&sigs, SIGABRT) == 0)
  40     __sigprocmask (SIG_UNBLOCK, &sigs, (sigset_t *) NULL);
  41
  42   /* If there is a user handler installed use it.  We don't close or
  43      flush streams.  */
  44   if (__sigaction (SIGABRT, NULL, &act) >= 0
  45       && act.sa_handler != SIG_DFL)
  46     {
  47       /* Send signal to call user handler.  */
  48       raise (SIGABRT);
  49
  50       /* It returns, so we are responsible for closing the streams.  */
  51       __close_all_streams ();
  52
  53       /* There was a handler installed.  Now remove it.  */
  54       memset (&act, '\0', sizeof (struct sigaction));
  55       act.sa_handler = SIG_DFL;
  56       __sigfillset (&act.sa_mask);
  57       act.sa_flags = 0;
  58       __sigaction (SIGABRT, &act, NULL);
  59     }
  60   else
  61     /* No handler installed so the next `raise' will hopefully
  62        terminate the process.  Therefore we must close the streams.  */
  63     __close_all_streams ();
  64
  65   /* Try again.  */
  66   raise (SIGABRT);
  67
  68   /* If we can't signal ourselves, exit.  */
  69   _exit (127);
  70
  71   /* If even this fails make sure we never return.  */
  72   while (1)
  73     /* For ever and ever.  */
  74     ;
  75 }