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Improve quality of raise(), abort(), and tkill()

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This change fixes a nasty bug where SIG_IGN and SIG_DFL weren't working
as advertised on BSDs. This change also fixes the tkill() definition on
MacOS so it maps to __pthread_kill().
This commit is contained in:
Justine Tunney 2022-09-03 18:12:01 -07:00
parent c5659b93f8
commit c5c4dfcd21
12 changed files with 293 additions and 63 deletions
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45
libc/runtime/abort.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/calls/struct/sigset.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/sig.h"
/**
* Terminates program abnormally.
*
* This function first tries to trigger your SIGABRT handler. If the
* signal handler returns, then `signal(SIGABRT, SIG_DFL)` is called
* before SIGABRT is raised again.
*
* @asyncsignalsafe
* @noreturn
*/
wontreturn void abort(void) {
sigset_t m;
sigemptyset(&m);
sigaddset(&m, SIGABRT);
sigprocmask(SIG_UNBLOCK, &m, 0);
raise(SIGABRT);
signal(SIGABRT, SIG_DFL);
raise(SIGABRT);
asm("hlt");
unreachable;
}