OrionLibC

diff --git a/include/signal.h b/include/signal.h
index 84535e8..b355567 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -40,6 +40,11 @@ int tgkill(pid_t tgid, pid_t tid, int sig);
 int kill(pid_t pid, int sig);
 sighandler_t signal(int signum, sighandler_t handler);
 int sigprocmask(int how, const sigset_t *set, sigset_t *oldset);
+int sigemptyset(sigset_t *set);
+int sigfillset(sigset_t *set);
+int sigaddset(sigset_t *set, int signum);
+int sigdelset(sigset_t *set, int signum);
+int sigismember(const sigset_t *set, int signum);
 
 #ifdef __cplusplus
 }