+#define SIGINT 2 // C99
+#define SIGILL 4 // C99
+#define SIGABRT 6 // C99
+#define SIGFPE 8 // C99
+#define SIGSEGV 11 // C99
+#define SIGTERM 15 // C99
+
+extern sighandler_t signal(int signum, sighandler_t handler);
+
+extern int raise(int sig);
+
+// POSIX Signals
+#define SIGHUP 1
+#define SIGQUIT 3
+#define SIGKILL 9
+#define SIGALRM 14
+#define SIGUSR1 16
+#define SIGUSR2 17