1#include <signal.h>
 2
 3int sigwait(const sigset_t *restrict mask, int *restrict sig)
 4{
 5	siginfo_t si;
 6	if (sigtimedwait(mask, &si, 0) < 0)
 7		return -1;
 8	*sig = si.si_signo;
 9	return 0;
10}