1 // SPDX-License-Identifier: GPL-2.0
3 #include "subcmd-util.h"
6 #define SIGCHAIN_MAX_SIGNALS 32
8 struct sigchain_signal {
13 static struct sigchain_signal signals[SIGCHAIN_MAX_SIGNALS];
15 static void check_signum(int sig)
17 if (sig < 1 || sig >= SIGCHAIN_MAX_SIGNALS)
18 die("BUG: signal out of range: %d", sig);
21 static int sigchain_push(int sig, sigchain_fun f)
23 struct sigchain_signal *s = signals + sig;
26 ALLOC_GROW(s->old, s->n + 1, s->alloc);
27 s->old[s->n] = signal(sig, f);
28 if (s->old[s->n] == SIG_ERR)
34 int sigchain_pop(int sig)
36 struct sigchain_signal *s = signals + sig;
41 if (signal(sig, s->old[s->n - 1]) == SIG_ERR)
47 void sigchain_push_common(sigchain_fun f)
49 sigchain_push(SIGINT, f);
50 sigchain_push(SIGHUP, f);
51 sigchain_push(SIGTERM, f);
52 sigchain_push(SIGQUIT, f);
53 sigchain_push(SIGPIPE, f);