X-Git-Url: https://code.citadel.org/?p=citadel.git;a=blobdiff_plain;f=citadel%2Fserver_main.c;h=061273a6336c034c2357039bf40ad3db4802a952;hp=45312588ee614e90f17c836fd2b05e95f7c5578c;hb=e6499f44a49d449e41ba605a0c7476019da432b4;hpb=ab71006c986efb39298cf0b9e5eed3988e8e2a74

diff --git a/citadel/server_main.c b/citadel/server_main.c
index 45312588e..061273a63 100644
--- a/citadel/server_main.c
+++ b/citadel/server_main.c
@@ -14,6 +14,7 @@
 #include <stdio.h>
 #include <sys/types.h>
 #include <grp.h>
+#include <sys/file.h>
 #include <libcitadel.h>
 
 #include "citserver.h"
@@ -34,6 +35,42 @@ const char *CitadelServiceTCP="citadel-TCP";
 
 void go_threading(void);
 
+
+
+/*
+ * Create or remove a lock file, so we only have one Citadel Server running at a time.
+ */
+void ctdl_lockfile(int yo) {
+	static char lockfilename[SIZ];
+	static FILE *fp;
+
+
+	if (yo) {
+		syslog(LOG_DEBUG, "Creating lockfile");
+		snprintf(lockfilename, sizeof lockfilename, "%s/citadel.lock", ctdl_run_dir);
+		fp = fopen(lockfilename, "w");
+		if (!fp) {
+			syslog(LOG_ERR, "Cannot open or create %s", lockfilename);
+			exit(CTDLEXIT_DB);
+		}
+		if (flock(fileno(fp), (LOCK_EX|LOCK_NB)) != 0) {
+			syslog(LOG_ERR, "Cannot lock %s , is another citserver running?", lockfilename);
+			exit(CTDLEXIT_DB);
+		}
+		return;
+	}
+
+	syslog(LOG_DEBUG, "Removing lockfile");
+	unlink(lockfilename);
+	flock(fileno(fp), LOCK_UN);
+	fclose(fp);
+}
+
+
+
+
+
+
 /*
  * Here's where it all begins.
  */
@@ -232,6 +269,8 @@ int main(int argc, char **argv)
 
 #endif
 
+	ctdl_lockfile(1);
+
 	/* Initialize... */
 	init_sysdep();
 
@@ -362,6 +401,7 @@ int main(int argc, char **argv)
 
 	go_threading();
 	
-	master_cleanup(exit_signal);
-	return(0);
+	int exit_code = master_cleanup(exit_signal);
+	ctdl_lockfile(0);
+	return(exit_code);
 }