upgrade .12 to .19

pause/main.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <signal.h>
+#include <stdlib.h>
+
+int main() {
+   int stat;
+   int sig;
+   sigset_t set;
+   sigemptyset(&set);
+   printf("add signal SIGINT: %i\n", sigaddset(&set, SIGINT));
+   printf("add signal SIGKILL: %i\n", sigaddset(&set, SIGKILL));
+   printf("add signal SIGTERM: %i\n", sigaddset(&set, SIGTERM));
+   sigprocmask(SIG_BLOCK, &set, NULL);
+   printf("Waiting...\n");
+   stat = sigwait(&set, &sig);
+   printf("Wait complete: %i (%i)\n", sig, stat);
+   printf("Stopped postgres: %i\n", system("service postgresql stop && sleep 5"));
+   printf("Saved postgres: %i\n", system("bash /backup.sh"));
+   return 0;
+}