Add bin and edit workflow

bin/gems/rb-fsevent-0.11.2/ext/fsevent_watch/signal_handlers.c

@@ -0,0 +1,66 @@
+#include "signal_handlers.h"
+#include <fcntl.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <unistd.h>
+
+
+#define PPID_ALARM_INTERVAL 2 // send SIGALRM every this seconds
+
+
+static pid_t orig_ppid;
+
+
+static void signal_handler(int _) {
+  exit(EXIT_FAILURE);
+}
+
+static void check_ppid(void) {
+  if (getppid() != orig_ppid) {
+    exit(EXIT_FAILURE);
+  }
+}
+
+static void check_stdout_open(void) {
+  if (fcntl(STDOUT_FILENO, F_GETFD) < 0) {
+    exit(EXIT_FAILURE);
+  }
+}
+
+static void alarm_handler(int _) {
+  check_ppid();
+  check_stdout_open();
+  alarm(PPID_ALARM_INTERVAL);
+  signal(SIGALRM, alarm_handler);
+}
+
+static void die(const char *msg) {
+  fprintf(stderr, "\nFATAL: %s\n", msg);
+  abort();
+}
+
+static void install_signal_handler(int sig, void (*handler)(int)) {
+  if (signal(sig, handler) == SIG_ERR) {
+    die("Could not install signal handler");
+  }
+}
+
+void install_signal_handlers(void) {
+  // check pipe is still connected
+  check_stdout_open();
+
+  // watch getppid() every PPID_ALARM_INTERVAL seconds 
+  orig_ppid = getppid();
+  if (orig_ppid <= 1) {
+    die("prematurely zombied");
+  }
+  install_signal_handler(SIGALRM, alarm_handler);
+  alarm(PPID_ALARM_INTERVAL);
+
+  // be sure to exit on SIGHUP, SIGPIPE
+  install_signal_handler(SIGHUP,  signal_handler);
+  install_signal_handler(SIGPIPE, signal_handler);
+}
+