From: Sami Kerola <kerolasa@iki.fi>
Date: Mon, 29 Aug 2016 10:09:08 +0000 (+0100)
Subject: usability: print usage() if unknown options are used
X-Git-Tag: v0.88~26^2~27
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c6c6d0fe1913feaa5f50679d1975517deca59ade;p=thirdparty%2Fmtr.git

usability: print usage() if unknown options are used

It is better to burn and fail than allow recovery from unexpected user
interface usage.
---

diff --git a/mtr.c b/mtr.c
index dc99681..ccf00f4 100644
--- a/mtr.c
+++ b/mtr.c
@@ -631,6 +631,8 @@ static void parse_arg (struct mtr_ctl *ctl, int argc, char **argv)
       error(EXIT_FAILURE, 0, "SO_MARK not enabled");
       break;
 #endif
+    default:
+      usage(stderr);
     }
   }