path: root/src/exit
diff options
authorRich Felker <>2012-06-02 21:53:04 -0400
committerRich Felker <>2012-06-02 21:53:04 -0400
commit2557d0ba47286ed3e868f8ddc9dbed0942fe99dc (patch)
tree7f729a729b7a1c21457783490c793d12a1b2c232 /src/exit
parent6a4b9472fb0a85e55030b37ec3017ba0319e03f9 (diff)
ensure that abort always works
Per POSIX, "The abort() function shall cause abnormal process termination to occur, unless the signal SIGABRT is being caught and the signal handler does not return." If SIGABRT is blocked or if a signal handler is installed and does return, abort is still required to cause abnormal program termination. We cannot use a_crash() to do this, since a SIGILL handler could also be installed (and might even longjmp out of the abort, not expecting to be invoked from within abort), nor can we rely on resetting the signal handler and re-raising the signal (this has race conditions in multi-threaded programs). On the other hand, SIGKILL is a perfectly safe, unblockable way to obtain abnormal program termination, and it requires no ugly loop-and-retry logic.
Diffstat (limited to 'src/exit')
1 files changed, 2 insertions, 0 deletions
diff --git a/src/exit/abort.c b/src/exit/abort.c
index 9a1c3d40..c5b9e526 100644
--- a/src/exit/abort.c
+++ b/src/exit/abort.c
@@ -1,8 +1,10 @@
#include <stdlib.h>
#include <signal.h>
+#include "syscall.h"
void abort(void)
+ raise(SIGKILL);
for (;;);