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