Set errno when refusing to send packet in interface_send_packet

Callers of interface_send_packet use perror and so expect errno to be
set in case of fail.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

diff --git a/interface.c b/interface.c
index ada8acb1bf18769a470a497ef91e8b057753c327..f9fe40a5fc5d877f7851e29b48242667679fddc0 100644 (file)
--- a/interface.c
+++ b/interface.c
@@ -125,6 +125,7 @@ interface_send_packet(struct interface *iface, struct sockaddr *to, struct iovec
 {
        if (!iface->multicast && !to) {
                fprintf(stderr, "No IP address specified for unicast interface\n");
+               errno = EINVAL;
                return -1;
        }