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-rw-r--r--src/exit/abort.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/src/exit/abort.c b/src/exit/abort.c
index ecc0f735..d6bd546b 100644
--- a/src/exit/abort.c
+++ b/src/exit/abort.c
@@ -3,11 +3,30 @@
#include "syscall.h"
#include "pthread_impl.h"
#include "atomic.h"
+#include "libc.h"
+#include "ksigaction.h"
+
+__attribute__((__visibility__("hidden")))
+volatile int __abort_lock[1];
_Noreturn void abort(void)
{
raise(SIGABRT);
+
+ /* If there was a SIGABRT handler installed and it returned, or if
+ * SIGABRT was blocked or ignored, take an AS-safe lock to prevent
+ * sigaction from installing a new SIGABRT handler, uninstall any
+ * handler that may be present, and re-raise the signal to generate
+ * the default action of abnormal termination. */
__block_all_sigs(0);
+ LOCK(__abort_lock);
+ __syscall(SYS_rt_sigaction, SIGABRT,
+ &(struct k_sigaction){.handler = SIG_DFL}, 0, _NSIG/8);
+ __syscall(SYS_tkill, __pthread_self()->tid, SIGABRT);
+ __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
+ &(long[_NSIG/(8*sizeof(long))]){1UL<<(SIGABRT-1)}, 0, _NSIG/8);
+
+ /* Beyond this point should be unreachable. */
a_crash();
raise(SIGKILL);
_Exit(127);