1#include <signal.h>
2
3void (*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
11weak_alias(signal, bsd_signal);
12weak_alias(signal, __sysv_signal);
13