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 hidden volatile int __abort_lock[1];
10
abort(void)11 _Noreturn void abort(void)
12 {
13 raise(SIGABRT);
14
15 /* If there was a SIGABRT handler installed and it returned, or if
16 * SIGABRT was blocked or ignored, take an AS-safe lock to prevent
17 * sigaction from installing a new SIGABRT handler, uninstall any
18 * handler that may be present, and re-raise the signal to generate
19 * the default action of abnormal termination. */
20 __block_all_sigs(0);
21 LOCK(__abort_lock);
22 __syscall(SYS_rt_sigaction, SIGABRT,
23 &(struct k_sigaction){.handler = SIG_DFL}, 0, _NSIG/8);
24 __syscall(SYS_tkill, __pthread_self()->tid, SIGABRT);
25 __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
26 &(long[_NSIG/(8*sizeof(long))]){1UL<<(SIGABRT-1)}, 0, _NSIG/8);
27
28 /* Beyond this point should be unreachable. */
29 a_crash();
30 raise(SIGKILL);
31 _Exit(127);
32 }
33