#include <signal.h>
#include "syscall.h"
#include "libc.h"

int __sigaction(int, const struct sigaction*, struct sigaction*);

void (*signal(int sig, void (*func)(int)))(int) {
  struct sigaction sa_old, sa = {.sa_handler = func, .sa_flags = SA_RESTART};
  if (__sigaction(sig, &sa, &sa_old) < 0)
    return SIG_ERR;
  return sa_old.sa_handler;
}

weak_alias(signal, bsd_signal);
weak_alias(signal, __sysv_signal);