write changed network interface names to the kernel log

diff --git a/udev_device.c b/udev_device.c
index bbf7963afce78897f38d88eca4a2b23efade9853..23ba313db3098e85cc91f50a38c678a6e86e6381 100644 (file)
--- a/udev_device.c
+++ b/udev_device.c
@@ -78,6 +78,26 @@ dev_t udev_device_get_devt(struct udevice *udev)
        return makedev(0, 0);
 }
 
+static void kernel_log(struct ifreq ifr)
+{
+       int klog;
+       FILE *f;
+
+       klog = open("/dev/kmsg", O_WRONLY);
+       if (klog < 0)
+               return;
+
+       f = fdopen(klog, "w");
+       if (f == NULL) {
+               close(klog);
+               return;
+       }
+
+       fprintf(f, "<6>udev: renamed network interface %s to %s\n",
+               ifr.ifr_name, ifr.ifr_newname);
+       fclose(f);
+}
+
 static int rename_netif(struct udevice *udev)
 {
        int sk;
@@ -98,7 +118,9 @@ static int rename_netif(struct udevice *udev)
        strlcpy(ifr.ifr_name, udev->dev->kernel, IFNAMSIZ);
        strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
        retval = ioctl(sk, SIOCSIFNAME, &ifr);
-       if (retval != 0) {
+       if (retval == 0)
+               kernel_log(ifr);
+       else {
                int loop;
 
                /* see if the destination interface name already exists */
@@ -122,8 +144,10 @@ static int rename_netif(struct udevice *udev)
                loop = 30 * 20;
                while (loop--) {
                        retval = ioctl(sk, SIOCSIFNAME, &ifr);
-                       if (retval == 0)
+                       if (retval == 0) {
+                               kernel_log(ifr);
                                break;
+                       }
 
                        if (errno != EEXIST) {
                                err("error changing net interface name %s to %s: %s",