Initial version

1 files changed, 30 insertions, 0 deletions

diff --git a/src/exit/abort.c b/src/exit/abort.c
new file mode 100644
index 0000000..f21f458
--- /dev/null
+++ b/src/exit/abort.c
@@ -0,0 +1,30 @@
+#include <stdlib.h>
+#include <signal.h>
+#include "syscall.h"
+#include "pthread_impl.h"
+#include "atomic.h"
+#include "lock.h"
+#include "ksigaction.h"
+
+_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);
+}