From: Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
Date: Sun, 20 Apr 2014 17:57:26 +0000 (-0400)
Subject: udev: warn when name_to_handle_at is not implemented
X-Git-Tag: v213~314
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=commitdiff_plain;h=e6c474723dc66cd4765fd09453d6b48bd5905ba4

udev: warn when name_to_handle_at is not implemented

We have a bunch of reports from people who have a custom kernel and
are confused why udev is not running. Issue a warning on
error. Barring an error in the code, the only error that is possible
is ENOSYS.

https://bugzilla.redhat.com/show_bug.cgi?id=1072966
---

diff --git a/src/libudev/libudev-monitor.c b/src/libudev/libudev-monitor.c
index c05cb3e51..186e5e1e8 100644
--- a/src/libudev/libudev-monitor.c
+++ b/src/libudev/libudev-monitor.c
@@ -119,8 +119,11 @@ static bool udev_has_devtmpfs(struct udev *udev) {
         int r;
 
         r = name_to_handle_at(AT_FDCWD, "/dev", &h.handle, &mount_id, 0);
-        if (r < 0)
+        if (r < 0) {
+                if (errno != EOPNOTSUPP)
+                        udev_err(udev, "name_to_handle_at on /dev: %m\n");
                 return false;
+        }
 
         f = fopen("/proc/self/mountinfo", "re");
         if (!f)