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authorEric Andersen <andersen@codepoet.org>2001-11-21 14:46:32 +0000
committerEric Andersen <andersen@codepoet.org>2001-11-21 14:46:32 +0000
commit4248737d6d674ca07d9264419a902a87355c09c6 (patch)
tree5bb8fa2ae100f598d788dde41f21276e7bdf92c1
parent14f7d9c3fd3fe0898e7479684a3733975101c290 (diff)
Cleanup abort() so it behaves itself a bit better
-rw-r--r--libc/stdlib/abort.c75
1 files changed, 65 insertions, 10 deletions
diff --git a/libc/stdlib/abort.c b/libc/stdlib/abort.c
index 7b7d6bb50..53abbd284 100644
--- a/libc/stdlib/abort.c
+++ b/libc/stdlib/abort.c
@@ -21,31 +21,86 @@ Cambridge, MA 02139, USA. */
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
+
+/* Our last ditch effort to commit suicide */
+#if defined(__i386__)
+#define ABORT_INSTRUCTION asm ("hlt")
+#elif defined(__ia64__)
+#define ABORT_INSTRUCTION asm ("break 0")
+#elif defined(__mc68000__)
+#define ABORT_INSTRUCTION asm ("illegal")
+#elif defined(__mips__)
+#define ABORT_INSTRUCTION asm ("break 255")
+#elif defined(__s390__)
+#define ABORT_INSTRUCTION asm (".word 0")
+#elif defined(__sparc__)
+#define ABORT_INSTRUCTION asm ("unimp 0xf00")
+#elif defined(__x86_64__)
+#define ABORT_INSTRUCTION asm ("hlt")
+#else
+#define ABORT_INSTRUCTION
+#endif
+
typedef void (*vfuncp) (void);
extern vfuncp __uClibc_cleanup;
extern void _exit __P((int __status)) __attribute__ ((__noreturn__));
+static int been_there_done_that = 0;
/* Cause an abnormal program termination with core-dump. */
void abort(void)
{
- sigset_t sigset;
+ sigset_t sigset;
+
+ /* Unmask SIGABRT to be sure we can get it */
+ if (__sigemptyset(&sigset) == 0 && __sigaddset(&sigset, SIGABRT) == 0) {
+ sigprocmask(SIG_UNBLOCK, &sigset, (sigset_t *) NULL);
+ }
+
+ /* __uClibc_cleanup NULLs itself out after being called */
+ if (__uClibc_cleanup) {
+ __uClibc_cleanup();
+ }
+
+ while (1) {
+ /* Try to suicide with a SIGABRT. */
+ if (been_there_done_that == 0) {
+ been_there_done_that++;
+ raise(SIGABRT);
+ }
+
+ /* Still here? Try to remove any signal handlers. */
+ if (been_there_done_that == 1) {
+ struct sigaction act;
- if (sigemptyset(&sigset) == 0 && sigaddset(&sigset, SIGABRT) == 0) {
- sigprocmask(SIG_UNBLOCK, &sigset, (sigset_t *) NULL);
+ been_there_done_that++;
+ memset (&act, '\0', sizeof (struct sigaction));
+ act.sa_handler = SIG_DFL;
+ __sigfillset (&act.sa_mask);
+ act.sa_flags = 0;
+ sigaction (SIGABRT, &act, NULL);
}
- if (__uClibc_cleanup) { /* Not already executing __uClibc_cleanup. */
- __uClibc_cleanup();
+ /* Still here? Try to suicide with an illegal instruction */
+ if (been_there_done_that == 2) {
+ been_there_done_that++;
+ ABORT_INSTRUCTION;
}
+ /* Still here? Try to at least exit */
+ if (been_there_done_that == 3) {
+ been_there_done_that++;
+ _exit (127);
+ }
+
+ /* Still here? We're screwed. Sleepy time. Good night */
while (1)
- if (raise(SIGABRT))
- /* If we can't signal ourselves, exit. */
- _exit(127);
- /* If we signal ourselves and are still alive,
- or can't exit, loop forever. */
+ /* Try for ever and ever. */
+ ABORT_INSTRUCTION;
+ }
}
+