Root/tools/perf/util/sigchain.c

1#include "sigchain.h"
2#include "cache.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        die("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

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