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 _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 }