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https://github.com/git/git
23 January 2022, 05:21:09 UTC
Revision 3e53891f85c58b4adb016a429a1f3b7fae78ca03 authored by Junio C Hamano on 10 December 2012, 21:05:47 UTC, committed by Junio C Hamano on 10 December 2012, 21:05:47 UTC 
Git 1.8.0.2
 
Signed-off-by: Junio C Hamano <gitster@pobox.com>
1 parent 5badfdc
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Tip revision: 3e53891f85c58b4adb016a429a1f3b7fae78ca03 authored by Junio C Hamano on 10 December 2012, 21:05:47 UTC
Git 1.8.0.2
Tip revision: 3e53891
sigchain.c 
#include "sigchain.h"
#include "cache.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);
}
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