[thirdparty/git.git] / 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);
}
Commit	Line	Data
4a16d072 JK	1	#include "sigchain.h"
	2	#include "cache.h"
	3
	4	#define SIGCHAIN_MAX_SIGNALS 32
	5
	6	struct sigchain_signal {
	7	sigchain_fun *old;
	8	int n;
	9	int alloc;
	10	};
	11	static struct sigchain_signal signals[SIGCHAIN_MAX_SIGNALS];
	12
	13	static 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
	19	int 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
	32	int 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	}
57b235a4 JK	44
	45	void 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	}