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git/sigchain.c
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#include "cache.h" | |
#include "sigchain.h" | |
#define SIGCHAIN_MAX_SIGNALS 32 | |
struct sigchain_signal { | |
sigchain_fun *old; | |
int n; | |
int alloc; | |
}; | |
static struct sigchain_signal signals[SIGCHAIN_MAX_SIGNALS]; | |
static void check_signum(int sig) | |
{ | |
if (sig < 1 || sig >= SIGCHAIN_MAX_SIGNALS) | |
die("BUG: signal out of range: %d", sig); | |
} | |
int sigchain_push(int sig, sigchain_fun f) | |
{ | |
struct sigchain_signal *s = signals + sig; | |
check_signum(sig); | |
ALLOC_GROW(s->old, s->n + 1, s->alloc); | |
s->old[s->n] = signal(sig, f); | |
if (s->old[s->n] == SIG_ERR) | |
return -1; | |
s->n++; | |
return 0; | |
} | |
int sigchain_pop(int sig) | |
{ | |
struct sigchain_signal *s = signals + sig; | |
check_signum(sig); | |
if (s->n < 1) | |
return 0; | |
if (signal(sig, s->old[s->n - 1]) == SIG_ERR) | |
return -1; | |
s->n--; | |
return 0; | |
} | |
void sigchain_push_common(sigchain_fun f) | |
{ | |
sigchain_push(SIGINT, f); | |
sigchain_push(SIGHUP, f); | |
sigchain_push(SIGTERM, f); | |
sigchain_push(SIGQUIT, f); | |
sigchain_push(SIGPIPE, f); | |
} | |
void sigchain_pop_common(void) | |
{ | |
sigchain_pop(SIGPIPE); | |
sigchain_pop(SIGQUIT); | |
sigchain_pop(SIGTERM); | |
sigchain_pop(SIGHUP); | |
sigchain_pop(SIGINT); | |
} |