iproute: print more verbose error on route cache flush
Before:
kda@vfirst ~/devel/iproute2 $ ./ip/ip route flush cache
Cannot open "/proc/sys/net/ipv4/route/flush"
After:
kda@vfirst ~/devel/iproute2/ip $ ./ip route flush cache
Cannot open "/proc/sys/net/ipv4/route/flush": Permission denied
Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org>
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 @@
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;
}