mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 03:27:39 +00:00
74 lines
2.9 KiB
C
74 lines
2.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2023 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/dce.h"
|
|
#include "libc/sysv/consts/sa.h"
|
|
#include "libc/sysv/consts/sig.h"
|
|
|
|
volatile int handler_invoked;
|
|
|
|
void signal_handler(int signum) {
|
|
handler_invoked = 1;
|
|
}
|
|
|
|
int main() {
|
|
sigset_t mask, oldmask;
|
|
struct sigaction sa, current_sa;
|
|
|
|
if (IsWindows()) {
|
|
// TODO(jart): support non-fatal signals between processes
|
|
return 0;
|
|
}
|
|
|
|
sa.sa_handler = signal_handler;
|
|
sa.sa_flags = SA_RESETHAND;
|
|
sigemptyset(&sa.sa_mask);
|
|
|
|
if (sigaction(SIGINT, &sa, 0) == -1) {
|
|
return 1;
|
|
}
|
|
|
|
sigemptyset(&mask);
|
|
sigaddset(&mask, SIGINT);
|
|
if (sigprocmask(SIG_BLOCK, &mask, &oldmask) == -1) {
|
|
return 2;
|
|
}
|
|
|
|
int pid = fork();
|
|
if (pid == -1) {
|
|
return 3;
|
|
} else if (pid == 0) {
|
|
kill(getppid(), SIGINT);
|
|
return 0;
|
|
} else {
|
|
sigsuspend(&oldmask);
|
|
if (!handler_invoked) {
|
|
return 4;
|
|
}
|
|
if (sigaction(SIGINT, 0, ¤t_sa) == -1) {
|
|
return 5;
|
|
}
|
|
if (current_sa.sa_handler != SIG_DFL) {
|
|
return 6;
|
|
}
|
|
return 0;
|
|
}
|
|
}
|