Merge pull request #76 from lumag/lock-who

Fix quitting if the board is locked

Author: konradybcio

cdba-server.c

@@ -201,6 +201,11 @@ static void sigpipe_handler(int signo)
 	watch_quit();
 }
 
+static void atexit_handler(void)
+{
+	syslog(LOG_INFO, "exiting");
+}
+
 int main(int argc, char **argv)
 {
 	int flags;
@@ -216,7 +221,8 @@ int main(int argc, char **argv)
 	if (!username)
 		username = "nobody";
 
-	openlog("cdba-server", 0, LOG_DAEMON);
+	openlog("cdba-server", LOG_PID, LOG_DAEMON);
+	atexit(atexit_handler);
 
 	ret = device_parser(".cdba");
 	if (ret) {

device.c

@@ -64,15 +64,21 @@ static void device_lock(struct device *device)
 	if (fd < 0)
 		err(1, "failed to open lockfile %s", lock);
 
-	n = flock(fd, LOCK_EX | LOCK_NB);
-	if (!n)
-		return;
+	while (1) {
+		char c;
+
+		n = flock(fd, LOCK_EX | LOCK_NB);
+		if (!n)
+			return;
 
-	warnx("board is in use, waiting...");
+		warnx("board is in use, waiting...");
 
-	n = flock(fd, LOCK_EX);
-	if (n < 0)
-		err(1, "failed to lock lockfile %s", lock);
+		sleep(3);
+
+		/* check that connection isn't gone */
+		if (read(STDIN_FILENO, &c, 1) == 0)
+			errx(1, "connection is gone");
+	}
 }
 
 static bool device_check_access(struct device *device,