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 sigset_t set, pending;
14 sigemptyset(&set);
15 sigaddset(&set, SIGABRT);
16
17 sigpending(&pending);
18 __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK, &set, 0, _NSIG / 8);
19 if (!sigismember(&pending, SIGABRT)) {
20 raise(SIGABRT);
21 }
22 /* If there was a SIGABRT handler installed and it returned, or if
23 * SIGABRT was blocked or ignored, take an AS-safe lock to prevent
24 * sigaction from installing a new SIGABRT handler, uninstall any
25 * handler that may be present, and re-raise the signal to generate
26 * the default action of abnormal termination. */
27 __block_all_sigs(0);
28 LOCK(__abort_lock);
29 signal(SIGABRT, SIG_DFL);
30 __syscall(SYS_tkill, __pthread_self()->tid, SIGABRT);
31 __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
32 &(long[_NSIG/(8*sizeof(long))]){1UL<<(SIGABRT-1)}, 0, _NSIG/8);
33
34 /* Beyond this point should be unreachable. */
35 a_crash();
36 raise(SIGKILL);
37 _Exit(127);
38 }
39