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1#include "git-compat-util.h"
2#include "sigchain.h"
3
4#define SIGCHAIN_MAX_SIGNALS 32
5
6struct sigchain_signal {
7 sigchain_fun *old;
8 int n;
9 int alloc;
10};
11static struct sigchain_signal signals[SIGCHAIN_MAX_SIGNALS];
12
13static void check_signum(int sig)
14{
15 if (sig < 1 || sig >= SIGCHAIN_MAX_SIGNALS)
16 BUG("signal out of range: %d", sig);
17}
18
19int sigchain_push(int sig, sigchain_fun f)
20{
21 struct sigchain_signal *s = signals + sig;
22 check_signum(sig);
23
24 ALLOC_GROW(s->old, s->n + 1, s->alloc);
25 s->old[s->n] = signal(sig, f);
26 if (s->old[s->n] == SIG_ERR)
27 return -1;
28 s->n++;
29 return 0;
30}
31
32int sigchain_pop(int sig)
33{
34 struct sigchain_signal *s = signals + sig;
35 check_signum(sig);
36 if (s->n < 1)
37 return 0;
38
39 if (signal(sig, s->old[s->n - 1]) == SIG_ERR)
40 return -1;
41 s->n--;
42 return 0;
43}
44
45void sigchain_push_common(sigchain_fun f)
46{
47 sigchain_push(SIGINT, f);
48 sigchain_push(SIGHUP, f);
49 sigchain_push(SIGTERM, f);
50 sigchain_push(SIGQUIT, f);
51 sigchain_push(SIGPIPE, f);
52}
53
54void sigchain_pop_common(void)
55{
56 sigchain_pop(SIGPIPE);
57 sigchain_pop(SIGQUIT);
58 sigchain_pop(SIGTERM);
59 sigchain_pop(SIGHUP);
60 sigchain_pop(SIGINT);
61}