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authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /stdlib/abort.c
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
downloadglibc-0ecb606cb6cf65de1d9fc8a919bceb4be476c602.tar.gz
2.5-18.1
Diffstat (limited to 'stdlib/abort.c')
-rw-r--r--stdlib/abort.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/stdlib/abort.c b/stdlib/abort.c
new file mode 100644
index 0000000000..00788f22c7
--- /dev/null
+++ b/stdlib/abort.c
@@ -0,0 +1,140 @@
+/* Copyright (C) 1991,93,95,96,97,98,2001,02 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <bits/libc-lock.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+/* Try to get a machine dependent instruction which will make the
+ program crash. This is used in case everything else fails. */
+#include <abort-instr.h>
+#ifndef ABORT_INSTRUCTION
+/* No such instruction is available. */
+# define ABORT_INSTRUCTION
+#endif
+
+#ifdef USE_IN_LIBIO
+# include <libio/libioP.h>
+# define fflush(s) _IO_flush_all_lockp (0)
+#endif
+
+/* We must avoid to run in circles. Therefore we remember how far we
+ already got. */
+static int stage;
+
+/* We should be prepared for multiple threads trying to run abort. */
+__libc_lock_define_initialized_recursive (static, lock);
+
+
+/* Cause an abnormal program termination with core-dump. */
+void
+abort (void)
+{
+ struct sigaction act;
+ sigset_t sigs;
+
+ /* First acquire the lock. */
+ __libc_lock_lock_recursive (lock);
+
+ /* Now it's for sure we are alone. But recursive calls are possible. */
+
+ /* Unlock SIGABRT. */
+ if (stage == 0)
+ {
+ ++stage;
+ if (__sigemptyset (&sigs) == 0 &&
+ __sigaddset (&sigs, SIGABRT) == 0)
+ __sigprocmask (SIG_UNBLOCK, &sigs, (sigset_t *) NULL);
+ }
+
+ /* Flush all streams. We cannot close them now because the user
+ might have registered a handler for SIGABRT. */
+ if (stage == 1)
+ {
+ ++stage;
+ fflush (NULL);
+ }
+
+ /* Send signal which possibly calls a user handler. */
+ if (stage == 2)
+ {
+ /* This stage is special: we must allow repeated calls of
+ `abort' when a user defined handler for SIGABRT is installed.
+ This is risky since the `raise' implementation might also
+ fail but I don't see another possibility. */
+ int save_stage = stage;
+
+ stage = 0;
+ __libc_lock_unlock_recursive (lock);
+
+ raise (SIGABRT);
+
+ __libc_lock_lock_recursive (lock);
+ stage = save_stage + 1;
+ }
+
+ /* There was a handler installed. Now remove it. */
+ if (stage == 3)
+ {
+ ++stage;
+ memset (&act, '\0', sizeof (struct sigaction));
+ act.sa_handler = SIG_DFL;
+ __sigfillset (&act.sa_mask);
+ act.sa_flags = 0;
+ __sigaction (SIGABRT, &act, NULL);
+ }
+
+ /* Now close the streams which also flushes the output the user
+ defined handler might has produced. */
+ if (stage == 4)
+ {
+ ++stage;
+ __fcloseall ();
+ }
+
+ /* Try again. */
+ if (stage == 5)
+ {
+ ++stage;
+ raise (SIGABRT);
+ }
+
+ /* Now try to abort using the system specific command. */
+ if (stage == 6)
+ {
+ ++stage;
+ ABORT_INSTRUCTION;
+ }
+
+ /* If we can't signal ourselves and the abort instruction failed, exit. */
+ if (stage == 7)
+ {
+ ++stage;
+ _exit (127);
+ }
+
+ /* If even this fails try to use the provided instruction to crash
+ or otherwise make sure we never return. */
+ while (1)
+ /* Try for ever and ever. */
+ ABORT_INSTRUCTION;
+}
+libc_hidden_def (abort)