# HG changeset patch
# User Michiel Broek <mbroek@mbse.eu>
# Date 1398361770 -7200
# Node ID 102c44bb8c9d07ff49a1e4dfe502e45c02de4343
# Parent  f78f313b1d3483eb415c0bab07b51e50139b0f21
Deamon code added

diff -r f78f313b1d34 -r 102c44bb8c9d lib/mbselib.h
--- a/lib/mbselib.h	Thu Apr 24 15:12:48 2014 +0200
+++ b/lib/mbselib.h	Thu Apr 24 19:49:30 2014 +0200
@@ -8,6 +8,8 @@
 #include <string.h>
 #include <ctype.h>
 #include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 #include <syslog.h>
 #include <unistd.h>
 #include <errno.h>
diff -r f78f313b1d34 -r 102c44bb8c9d thermometers/main.c
--- a/thermometers/main.c	Thu Apr 24 15:12:48 2014 +0200
+++ b/thermometers/main.c	Thu Apr 24 19:49:30 2014 +0200
@@ -37,6 +37,7 @@
 static bool		connected = true;
 static bool		disconnect_sent = false;
 static bool		shutdown = false;
+static pid_t		pgrp, mypid;
 
 extern bool		debug;
 extern sys_config	Config;
@@ -48,8 +49,9 @@
 
 void help(void)
 {
+    fprintf(stdout, "mbsePi-apps thermometers v%s starting\n\n", VERSION);
     fprintf(stdout, "Usage: thermomeneters [-d] [-h]\n");
-    fprintf(stdout, "  -d --debug              Debug on\n");
+    fprintf(stdout, "  -d --debug              Debug and run in foreground\n");
     fprintf(stdout, "  -h --help               Display this help\n");
 }
 
@@ -118,7 +120,8 @@
 
 int main(int argc, char *argv[])
 {
-    int rc, c, i;
+    int		rc, c, i;
+    pid_t	frk;
 
     while (1) {
 	int option_index = 0;
@@ -142,6 +145,8 @@
 
     openlog("thermometers", LOG_PID|LOG_CONS|LOG_NOWAIT, LOG_USER);
     syslog(LOG_NOTICE, "mbsePi-apps thermometers v%s starting", VERSION);
+    if (debug)
+	fprintf(stdout, "mbsePi-apps thermometers v%s starting\n", VERSION);
 
     if (rdconfig()) {
 	fprintf(stderr, "Error reading configuration\n");
@@ -159,7 +164,64 @@
 	    signal(i, (void (*))die);
     }
 
-    rc = server();
+
+    if (debug) {
+	/*
+	 * For debugging run in foreground.
+	 */
+	rc = server();
+    } else {
+	/*
+	 * Server initialization is complete. Now we can fork the 
+	 * daemon and return to the user. We need to do a setpgrp
+	 * so that the daemon will no longer be assosiated with the
+	 * users control terminal. This is done before the fork, so
+	 * that the child will not be a process group leader. Otherwise,
+	 * if the child were to open a terminal, it would become
+	 * associated with that terminal as its control terminal.
+	 */
+	if ((pgrp = setpgid(0, 0)) == -1) {
+	    syslog(LOG_NOTICE, "setpgpid failed");
+	}
+
+	frk = fork();
+	switch (frk) {
+	    case -1:	
+		    	syslog(LOG_NOTICE, "Daemon fork failed: %s", strerror(errno));
+			syslog(LOG_NOTICE, "Finished, rc=1");
+			exit(1);
+	    case 0:	/*
+			 * Run the daemon
+			 */
+			fclose(stdin);
+			if (open("/dev/null", O_RDONLY) != 0) {
+			    syslog(LOG_NOTICE, "Reopen of stdin to /dev/null failed");
+			    _exit(2);
+			}
+			fclose(stdout);
+			if (open("/dev/null", O_WRONLY | O_APPEND | O_CREAT,0600) != 1) {
+			    syslog(LOG_NOTICE, "Reopen of stdout to /dev/null failed");
+			    _exit(2);
+			}
+			fclose(stderr);
+			if (open("/dev/null", O_WRONLY | O_APPEND | O_CREAT,0600) != 2) {
+			    syslog(LOG_NOTICE, "Reopen of stderr to /dev/null failed");
+			    _exit(2);
+			}
+			mypid = getpid();
+			rc = server();
+			break;
+			/* Not reached */
+	    default:
+			/*
+			 * Here we detach this process and let the child
+			 * run the deamon process.
+			 */
+			syslog(LOG_NOTICE, "Starting daemon with pid %d", frk);
+			exit(0);
+	}
+    }
+
     syslog(LOG_NOTICE, "Finished, rc=%d", rc);
     return rc;
 }
@@ -224,9 +286,7 @@
     state = xstrcat(state, hostname);
     state = xstrcat(state, (char *)"/thermometers/state");
     sprintf(buf, "0");
-
-    rc = mosquitto_will_set(mosq, state, strlen(buf), buf, qos, true);
-    if (rc) {
+    if ((rc = mosquitto_will_set(mosq, state, strlen(buf), buf, qos, true))) {
         if (rc == MOSQ_ERR_INVAL) {
             syslog(LOG_NOTICE, "mosquitto_will_set: input parameters invalid");
         } else if (rc == MOSQ_ERR_NOMEM) {
@@ -243,8 +303,7 @@
     mosquitto_disconnect_callback_set(mosq, my_disconnect_callback);
     mosquitto_publish_callback_set(mosq, my_publish_callback);
 
-    rc = mosquitto_connect(mosq, Config.mosq_host, Config.mosq_port, keepalive);
-    if (rc) {
+    if ((rc = mosquitto_connect(mosq, Config.mosq_host, Config.mosq_port, keepalive))) {
 	if (rc == MOSQ_ERR_ERRNO) {
 	    strerror_r(errno, err, 1024);
 	    syslog(LOG_NOTICE, "mosquitto_connect: error: %s", err);
@@ -263,11 +322,13 @@
     sprintf(buf, "1");
     rc = mosquitto_publish(mosq, &mid_sent, state, strlen(buf), buf, qos, 1);
 
-    fprintf(stdout, (char *)"Enter loop, connected %d\n", connected);
+    if (debug)
+	fprintf(stdout, (char *)"Enter loop, connected %d\n", connected);
+
     do {
 	if (status == STATUS_CONNACK_RECVD) {
 	    /*
-	     * Here send our sensors values
+	     * Here send our 1-wire sensors values
 	     */
 	    for (tmp1 = Config.w1therms; tmp1; tmp1 = old1) {
 		old1 = tmp1->next;
@@ -341,7 +402,8 @@
 		    tmp1->present = 1;
 		} else {
 		    tmp1->present = 0;
-		    printf("sensor %s is missing\n", tmp1->name);
+		    if (debug)
+		    	printf("sensor %s is missing\n", tmp1->name);
 		}
 
 		free(device);
@@ -361,7 +423,8 @@
 		status = STATUS_WAITING;
 	    }
 	} else if (status == STATUS_WAITING) {
-	    fprintf(stdout, (char *)"Waiting\n");
+	    if (debug)
+	    	fprintf(stdout, (char *)"Waiting\n");
 	    if (last_mid_sent == last_mid && disconnect_sent == false) {
 		mosquitto_disconnect(mosq);
 		disconnect_sent = true;
@@ -370,14 +433,15 @@
 	}
 	rc = MOSQ_ERR_SUCCESS;
 
-    } while(rc == MOSQ_ERR_SUCCESS && connected);
-    fprintf(stdout, (char *)"Out of loop\n");
+    } while (rc == MOSQ_ERR_SUCCESS && connected);
+
+    if (debug)
+	fprintf(stdout, (char *)"Out of loop\n");
 
     mosquitto_loop_stop(mosq, false);
-
     mosquitto_destroy(mosq);
     mosquitto_lib_cleanup();
 
-    return 0;
+    return rc;
 }