[wasi-libc.git] / libc-top-half / musl / src / signal / sigset.c

#include <signal.h>

void (*sigset(int sig, void (*handler)(int)))(int)
{
	struct sigaction sa, sa_old;
	sigset_t mask, mask_old;

	sigemptyset(&mask);
	if (sigaddset(&mask, sig) < 0)
		return SIG_ERR;
	
	if (handler == SIG_HOLD) {
		if (sigaction(sig, 0, &sa_old) < 0)
			return SIG_ERR;
		if (sigprocmask(SIG_BLOCK, &mask, &mask_old) < 0)
			return SIG_ERR;
	} else {
		sa.sa_handler = handler;
		sa.sa_flags = 0;
		sigemptyset(&sa.sa_mask);
		if (sigaction(sig, &sa, &sa_old) < 0)
			return SIG_ERR;
		if (sigprocmask(SIG_UNBLOCK, &mask, &mask_old) < 0)
			return SIG_ERR;
	}
	return sigismember(&mask_old, sig) ? SIG_HOLD : sa_old.sa_handler;
}
Commit	Line	Data
320054e8 DG	1	#include <signal.h>
	2
	3	void (sigset(int sig, void (handler)(int)))(int)
	4	{
	5	struct sigaction sa, sa_old;
d4db3fa2	6	sigset_t mask, mask_old;
320054e8 DG	7
	8	sigemptyset(&mask);
	9	if (sigaddset(&mask, sig) < 0)
	10	return SIG_ERR;
	11
	12	if (handler == SIG_HOLD) {
	13	if (sigaction(sig, 0, &sa_old) < 0)
	14	return SIG_ERR;
d4db3fa2	15	if (sigprocmask(SIG_BLOCK, &mask, &mask_old) < 0)
320054e8 DG	16	return SIG_ERR;
	17	} else {
	18	sa.sa_handler = handler;
	19	sa.sa_flags = 0;
	20	sigemptyset(&sa.sa_mask);
	21	if (sigaction(sig, &sa, &sa_old) < 0)
	22	return SIG_ERR;
d4db3fa2	23	if (sigprocmask(SIG_UNBLOCK, &mask, &mask_old) < 0)
320054e8 DG	24	return SIG_ERR;
320054e8 DG	25	}
d4db3fa2	26	return sigismember(&mask_old, sig) ? SIG_HOLD : sa_old.sa_handler;
320054e8	27	}