netdev - [PATCH] iproute: print more verbose error on route cache flush

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Message-Id: <1441438850-4793-1-git-send-email-kda@linux-powerpc.org>
Date:	Sat,  5 Sep 2015 10:40:50 +0300
From:	Denis Kirjanov <kda@...ux-powerpc.org>
To:	stephen@...workplumber.org
Cc:	netdev@...r.kernel.org, Denis Kirjanov <kda@...ux-powerpc.org>
Subject: [PATCH] iproute: print more verbose error on route cache flush

Before:
kda@...rst ~/devel/iproute2 $ ./ip/ip route flush cache
Cannot open "/proc/sys/net/ipv4/route/flush"

After:
kda@...rst ~/devel/iproute2/ip $ ./ip route flush cache
Cannot open "/proc/sys/net/ipv4/route/flush": Permission denied

Signed-off-by: Denis Kirjanov <kda@...ux-powerpc.org>
---
 ip/iproute.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ip/iproute.c b/ip/iproute.c
index 8f49e62..abe4180 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -1213,7 +1213,8 @@ static int iproute_flush_cache(void)
 	char *buffer = "-1";
 
 	if (flush_fd < 0) {
-		fprintf (stderr, "Cannot open \"%s\"\n", ROUTE_FLUSH_PATH);
+		fprintf (stderr, "Cannot open \"%s\": %s\n",
+				ROUTE_FLUSH_PATH, strerror(errno));
 		return -1;
 	}
 
-- 
2.4.0

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