X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=libudev%2Flibudev-monitor.c;h=a3789c4d1340561e468f1b32629c2c9cfe0be18e;hp=24e8aead2635595898aa6479aa25d023607fbdf6;hb=4cbe7095226e0e4a050ef347ddc297386a571557;hpb=28460195c2ae90892bf556aff2b80705a8f37795

diff --git a/libudev/libudev-monitor.c b/libudev/libudev-monitor.c
index 24e8aead2..a3789c4d1 100644
--- a/libudev/libudev-monitor.c
+++ b/libudev/libudev-monitor.c
@@ -400,6 +400,16 @@ int udev_monitor_enable_receiving(struct udev_monitor *udev_monitor)
 	return 0;
 }
 
+/**
+ * udev_monitor_set_receive_buffer_size:
+ * @udev_monitor: the monitor which should receive events
+ * @size: the size in bytes
+ *
+ * Set the size of the kernel socket buffer. This call needs the
+ * appropriate privileges to succeed.
+ *
+ * Returns: 0 on success, otherwise -1 on error.
+ */
 int udev_monitor_set_receive_buffer_size(struct udev_monitor *udev_monitor, int size)
 {
 	if (udev_monitor == NULL)
@@ -615,8 +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;