Fixes:
-bash-4.3# ss --udp -l -p
State Recv-Q Send-Q Local Address:Port Peer Address:Port
UNCONN 0 0 *:5355 *:* users:(("systemd-resolve",pid=601,fd=12))
UNCONN 0 0 :::5355 :::* users:(("systemd-resolve",pid=601,fd=14))
-bash-4.3# nping --udp -p 5355 --data-length 0 -c 1 localhost
-bash-4.3# journalctl -u systemd-resolved -b --no-hostname
...
May 21 14:59:22 systemd-resolved[601]: Event source llmnr-ipv4-udp (type io) returned error, disabling: Input/output error
...
-bash-4.3# nping --udp -p 5355 --data-length 1000 -c 1 localhost
-bash-4.3# ss --udp -l
State Recv-Q Send-Q Local Address:Port Peer Address:Port
UNCONN 2304 0 *:5355 *:*
UNCONN 0 0 :::5355 :::*
mh.msg_controllen = sizeof(control);
l = recvmsg(fd, &mh, 0);
+ if (l == 0)
+ return 0;
if (l < 0) {
if (errno == EAGAIN || errno == EINTR)
return 0;
return -errno;
}
- if (l <= 0)
- return -EIO;
-
assert(!(mh.msg_flags & MSG_CTRUNC));
assert(!(mh.msg_flags & MSG_TRUNC));