1 #include <signal.h>
2 
signal(int sig, void (*func)(int))3 void (*signal(int sig, void (*func)(int)))(int)
4 {
5 	struct sigaction sa_old, sa = { .sa_handler = func, .sa_flags = SA_RESTART };
6 	if (__sigaction(sig, &sa, &sa_old) < 0)
7 		return SIG_ERR;
8 	return sa_old.sa_handler;
9 }
10 
11 weak_alias(signal, bsd_signal);
12 weak_alias(signal, __sysv_signal);
13