1#include <stdlib.h>
 2#include <signal.h>
 3#include "syscall.h"
 4#include "pthread_impl.h"
 5#include "atomic.h"
 6#include "lock.h"
 7#include "ksigaction.h"
 8
 9_Noreturn void abort(void)
10{
11	raise(SIGABRT);
12
13	/* If there was a SIGABRT handler installed and it returned, or if
14	 * SIGABRT was blocked or ignored, take an AS-safe lock to prevent
15	 * sigaction from installing a new SIGABRT handler, uninstall any
16	 * handler that may be present, and re-raise the signal to generate
17	 * the default action of abnormal termination. */
18	__block_all_sigs(0);
19	LOCK(__abort_lock);
20	__syscall(SYS_rt_sigaction, SIGABRT,
21		&(struct k_sigaction){.handler = SIG_DFL}, 0, _NSIG/8);
22	__syscall(SYS_tkill, __pthread_self()->tid, SIGABRT);
23	__syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
24		&(long[_NSIG/(8*sizeof(long))]){1UL<<(SIGABRT-1)}, 0, _NSIG/8);
25
26	/* Beyond this point should be unreachable. */
27	a_crash();
28	raise(SIGKILL);
29	_Exit(127);
30}