add multiple instance warning if the device is busy.

1 files changed, 2 insertions, 1 deletions

diff --git a/marsond.c b/marsond.c
index f872baf..b94883b 100644
--- a/marsond.c
+++ b/marsond.c
@@ -235,6 +235,8 @@ int main(int argc, char **argv) {
 	if(ioctl(infd, EVIOCGRAB, 1) >= 0) {
 		debug("grabbed %s", keyboard_dev);
 	} else {
+		if(errno == EBUSY)
+			warn("is an instance of %s already running?", self);
 		die("failed to grab %s: %s", keyboard_dev, strerror(errno));
 	}
 
@@ -272,7 +274,6 @@ int main(int argc, char **argv) {
 		die("UI_DEV_CREATE failed: %s", strerror(errno));
 	}
 
-
 	/* this must be done while still running as root... */
 	if(foreground) {
 		lock_memory();