From 8f39695140b711ec7cf18441f4d911f8ce7faba3 Mon Sep 17 00:00:00 2001
From: Sergey Popov <admin@pinkbyte.ru>
Date: Mon, 12 Dec 2011 15:03:45 +0400
Subject: [PATCH] main loop locking and config re-reading on SIGHUP

---
 yasnd.c | 71 ++++++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 53 insertions(+), 18 deletions(-)

diff --git a/yasnd.c b/yasnd.c
index e891326..aa5b772 100644
--- a/yasnd.c
+++ b/yasnd.c
@@ -21,6 +21,7 @@ char* phone_device=NULL; // phone device for gammu, for example: "/dev/ttyACM0"
 char* phone_model=NULL; // gammu phone model, for example: "at"
 char* phone_connection=NULL; // gammu phone connection type, for example: "at"
 char* recipient_number=NULL; // recipient of sms alerts
+bool loop_locked=false ; // flag for locking main loop while config re-reading
 
 void log_debug(const char *message,int verbosity)
 {
@@ -174,18 +175,43 @@ void loop_function()
 	}
 }
 
-void termination_handler(int signum)
+void signal_handler(int signum)
 {
-	log_event("SIGTERM captured, daemon stopping");
-	closelog();
-	// free config structure
-	cfg_free(cfg);
-	// free gammu structure
-	GSM_FreeStateMachine(state_machine);
-	// free hosts structures memory
-	if (hosts!=NULL)
-		free(hosts);
-	exit(EXIT_SUCCESS);
+	void free_resources()
+	{
+		// free config structure
+		cfg_free(cfg);
+		// free gammu structure
+		GSM_FreeStateMachine(state_machine);
+		// free hosts structures memory
+		if (hosts!=NULL)
+			free(hosts);
+	}
+
+	if (signum==SIGHUP)
+	{
+		log_event("SIGHUP captured, daemon re-read config");
+		// lock Main Loop
+		loop_locked=true;
+
+		// STUB: need to kill all childs here
+
+		// free all resources
+		free_resources();
+		// run init again
+		init();
+		// sleep 5 seconds and unlock Main Loop
+		sleep(5);
+		loop_locked=false;
+		return;
+	}
+	if (signum==SIGTERM)
+	{
+		log_event("SIGTERM captured, daemon stopping");
+		closelog();
+		free_resources(); // free all other resources
+		exit(EXIT_SUCCESS);
+	}
 }
 
 int main(void) {
@@ -226,18 +252,27 @@ int main(void) {
 	close(STDOUT_FILENO);
 	close(STDERR_FILENO);
 
-	// Set signal handler for SIGTERM
-	signal(SIGTERM, termination_handler);
+	// Set signal handlers
+	signal(SIGTERM, signal_handler);
+	signal(SIGHUP, signal_handler);
 
 	// Init apropriate structures
 	init();
 
-	/* The Big Loop */
+	/* The Main Loop */
 	while (1) {
-		loop_function();
-//		sleep(60); /* wait 60 seconds */
-		log_event("Exiting");
-		exit(EXIT_SUCCESS);
+		if (!loop_locked)
+		{
+			loop_function();
+//			sleep(60); /* wait 60 seconds */
+			log_event("Exiting");
+			exit(EXIT_SUCCESS);
+		}
+		else
+		{
+			// if loop is locked, just wait 1 second and start it again
+			sleep(1);
+		}
 	}
 	exit(EXIT_SUCCESS);
 }