| #include "git-compat-util.h" |
| #include "alloc.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) |
| 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); |
| } |