[pisa-src] r1147 - trunk/pairing/management.c
- From: Jan Marten <jan.marten@xxxxxxxxxxxxxx>
- To: pisa-src@xxxxxxxxxxxxx
- Date: Wed, 14 Oct 2009 16:38:44 +0200
Author: marten
Date: Wed Oct 14 16:38:43 2009
New Revision: 1147
Log:
Added Lock-file creation to the management tool
Modified:
trunk/pairing/management.c
Modified: trunk/pairing/management.c
==============================================================================
--- trunk/pairing/management.c Wed Oct 14 16:02:06 2009 (r1146)
+++ trunk/pairing/management.c Wed Oct 14 16:38:43 2009 (r1147)
@@ -342,6 +342,35 @@
return ul;
}
+/* Tries to create a lock file to let only one instance of the program run
+ * @return 0 -> An instance is running
+ * @return 1 -> Lock file was created successfully
+ */
+static int get_lock(void)
+{
+ int fdlock;
+ struct flock fl;
+
+ fl.l_type = F_WRLCK;
+ fl.l_whence = SEEK_SET;
+ fl.l_start = 0;
+ fl.l_len = 1;
+
+ if((fdlock = open("pisamgmt.lock", O_WRONLY|O_CREAT, 666)) == -1)
+ {
+ return 0;
+ }
+
+ if(fcntl(fdlock, F_SETLK, &fl) == -1)
+ {
+ return 0;
+ }
+
+ return 1;
+
+
+}
+
/** Main program that will be run on the user's computer.
*/
int main(int argc, char *argv[])
@@ -357,6 +386,12 @@
pisa_userhitlist_entry *uhlentry = NULL;
pisa_userhitlist_entry new_entry = {};
+ if(!get_lock())
+ {
+ PISA_ERROR("A management instance is already running!");
+ return ERROR_ALREADY_RUNNING;
+ }
+
pisa_mgmt_conf_init(&managementconf);
new_entry.active = NO_CHANGE;
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