From: Marco d'Itri <md@linux.it>
Date: Mon, 19 Jul 2010 08:56:37 +0000 (+0200)
Subject: log an error when a message from the wrong version of udevadm is ignored
X-Git-Tag: 174~404
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=commitdiff_plain;h=9b6c6b56123670050b1dc5eb69ea1a9638bedd39

log an error when a message from the wrong version of udevadm is ignored
---

diff --git a/libudev/libudev-monitor.c b/libudev/libudev-monitor.c
index b3e5d5f34..a3789c4d1 100644
--- a/libudev/libudev-monitor.c
+++ b/libudev/libudev-monitor.c
@@ -625,8 +625,11 @@ retry:
 	if (memcmp(buf, "libudev", 8) == 0) {
 		/* udev message needs proper version magic */
 		nlh = (struct udev_monitor_netlink_header *) buf;
-		if (nlh->magic != htonl(UDEV_MONITOR_MAGIC))
+		if (nlh->magic != htonl(UDEV_MONITOR_MAGIC)) {
+			err(udev_monitor->udev, "ignored a message from an invalid release of udevadm (%x != %x)\n",
+			    nlh->magic, htonl(UDEV_MONITOR_MAGIC));
 			return NULL;
+		}
 		if (nlh->properties_off+32 > buflen)
 			return NULL;
 		bufpos = nlh->properties_off;