From d5f953fed99a811e2a815bc247558c2e34bcc8ec Mon Sep 17 00:00:00 2001
From: Christian Riesch <christian.riesch@omicron.at>
Date: Tue, 27 Mar 2012 11:50:54 +0200
Subject: [PATCH] Output an error message when no interface is specified

Signed-off-by: Christian Riesch <christian.riesch@omicron.at>
---
 ptp4l.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ptp4l.c b/ptp4l.c
index 01e3966..2eca0ef 100644
--- a/ptp4l.c
+++ b/ptp4l.c
@@ -151,6 +151,7 @@ int main(int argc, char *argv[])
 	}
 
 	if (!nports) {
+		fprintf(stderr, "no interface specified\n");
 		usage(progname);
 		return -1;
 	}