diff options
Diffstat (limited to 'src/exit/abort.c')
| -rw-r--r-- | src/exit/abort.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/exit/abort.c b/src/exit/abort.c index ecc0f735..d6bd546b 100644 --- a/src/exit/abort.c +++ b/src/exit/abort.c @@ -3,11 +3,30 @@ #include "syscall.h" #include "pthread_impl.h" #include "atomic.h" +#include "libc.h" +#include "ksigaction.h" + +__attribute__((__visibility__("hidden"))) +volatile int __abort_lock[1]; _Noreturn void abort(void) { raise(SIGABRT); + + /* If there was a SIGABRT handler installed and it returned, or if + * SIGABRT was blocked or ignored, take an AS-safe lock to prevent + * sigaction from installing a new SIGABRT handler, uninstall any + * handler that may be present, and re-raise the signal to generate + * the default action of abnormal termination. */ __block_all_sigs(0); + LOCK(__abort_lock); + __syscall(SYS_rt_sigaction, SIGABRT, + &(struct k_sigaction){.handler = SIG_DFL}, 0, _NSIG/8); + __syscall(SYS_tkill, __pthread_self()->tid, SIGABRT); + __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK, + &(long[_NSIG/(8*sizeof(long))]){1UL<<(SIGABRT-1)}, 0, _NSIG/8); + + /* Beyond this point should be unreachable. */ a_crash(); raise(SIGKILL); _Exit(127); |