libc-top-half/musl/src/exit/abort.c

   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
  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 }