github.com/afumu/libc@v0.0.6/musl/src/exit/abort.c (about)

     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  }