add passing of PID to the error scripts

example/on_error.sh

@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
 
 # faux email / alert
-echo "it broke!" > email
+pid=$1
+echo "process $pid broke!" > email

src/mon.c

@@ -218,9 +218,11 @@ daemonize() {
  */
 
 void
-exec_restart_command(monitor_t *monitor) {
-  log("on restart `%s`", monitor->on_restart);
-  int status = system(monitor->on_restart);
+exec_restart_command(monitor_t *monitor, pid_t pid) {
+  char buf[256] = {0};
+  snprintf(buf, 256, "%s %d", monitor->on_restart, pid);
+  log("on restart `%s`", buf);
+  int status = system(buf);
   if (status) log("exit(%d)", status);
 }
 
@@ -229,9 +231,11 @@ exec_restart_command(monitor_t *monitor) {
  */
 
 void
-exec_error_command(monitor_t *monitor) {
-  log("on error `%s`", monitor->on_error);
-  int status = system(monitor->on_error);
+exec_error_command(monitor_t *monitor, pid_t pid) {
+  char buf[256] = {0};
+  snprintf(buf, 256, "%s %d", monitor->on_error, pid);
+  log("on error `%s`", buf);
+  int status = system(buf);
   if (status) log("exit(%d)", status);
 }
 
@@ -320,7 +324,7 @@ exec: {
 
       // restart
       error: {
-        if (monitor->on_restart) exec_restart_command(monitor);
+        if (monitor->on_restart) exec_restart_command(monitor, pid);
         int64_t ms = ms_since_last_restart(monitor);
         monitor->last_restart_at = timestamp();
         log("last restart %s ago", milliseconds_to_long_string(ms));
@@ -329,7 +333,7 @@ exec: {
         if (attempts_exceeded(monitor, ms)) {
           char *time = milliseconds_to_long_string(60000 - monitor->clock);
           log("%d restarts within %s, bailing", monitor->max_attempts, time);
-          exec_error_command(monitor);
+          exec_error_command(monitor, pid);
           log("bye :)");
           exit(2);
         }