libudev: monitor - fix error path in send_device

Return -errno rather than -1 in case sendmsg() fails.

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/src/libudev/libudev-monitor.c b/src/libudev/libudev-monitor.c
index 3f1fee7f7e..d0486e3d1e 100644
--- a/src/libudev/libudev-monitor.c
+++ b/src/libudev/libudev-monitor.c
@@ -749,12 +749,20 @@ int udev_monitor_send_device(struct udev_monitor *udev_monitor,
          * If we send to a multicast group, we will get
          * ECONNREFUSED, which is expected.
          */
-        if (destination != NULL)
+        if (destination)
                 smsg.msg_name = &destination->snl;
         else
                 smsg.msg_name = &udev_monitor->snl_destination;
         smsg.msg_namelen = sizeof(struct sockaddr_nl);
         count = sendmsg(udev_monitor->sock, &smsg, 0);
+        if (count < 0) {
+                if (!destination && errno == ECONNREFUSED) {
+                        log_debug("passed unknown number of bytes to netlink monitor %p", udev_monitor);
+                        return 0;
+                } else
+                        return -errno;
+        }
+
         log_debug("passed %zi bytes to netlink monitor %p", count, udev_monitor);
         return count;
 }