From 7ecbe35d830e188e22195aa8898e2b160c1ccf79 Mon Sep 17 00:00:00 2001
From: Sergey Popov <admin@pinkbyte.ru>
Date: Sun, 18 Dec 2011 12:07:40 +0400
Subject: [PATCH] move Main Loop to a separate clone process

---
 yasnd.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/yasnd.c b/yasnd.c
index 142aa39..8e7ac0e 100644
--- a/yasnd.c
+++ b/yasnd.c
@@ -22,6 +22,7 @@ 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
 int failures_first=3 ; // count of failures while hosts checking, that triggers first SMS sending
+pid_t mainloop_clone_pid; // pid of clone process, that containt main loop
 
 void log_debug(const char *message,int verbosity)
 {
@@ -158,8 +159,12 @@ void reset_pin(int pin_num)
 	outb (0, LPTPORT);
 }
 
-void loop_function()
+int loop_function()
 {
+	// set default signal handlers
+	signal(SIGTERM,SIG_DFL);
+	signal(SIGHUP,SIG_DFL);
+	//
 	for (int i=0;i<hosts_count;i++)
 	{
 		check_host(i,&hosts[i]);
@@ -223,9 +228,9 @@ void signal_handler(int signum)
 		log_event("SIGHUP captured, daemon re-read config");
 		// lock Main Loop
 		loop_locked=true;
-
-		// STUB: need to kill all childs here
-
+		// kill Main Loop clone process
+		kill(mainloop_clone_pid,SIGTERM);
+		waitpid(mainloop_clone_pid,NULL,__WCLONE);
 		// free all resources
 		free_resources();
 		// Init IPC loop again
@@ -302,7 +307,9 @@ int main(void) {
 	while (1) {
 		if (!loop_locked)
 		{
-			loop_function();
+			unsigned char child_stack[16384];
+			mainloop_clone_pid=clone(loop_function,child_stack+8192,CLONE_VM,NULL);
+			waitpid(mainloop_clone_pid,NULL,__WCLONE);
 			sleep(60); /* wait 60 seconds */
 //			log_event("Exiting");
 //			exit(EXIT_SUCCESS);