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| author | Ben Shelton <ben.shelton@ni.com> | 2014-07-21 11:53:47 -0500 |
|---|---|---|
| committer | Richard Purdie <richard.purdie@linuxfoundation.org> | 2014-07-23 21:44:20 +0100 |
| commit | 53543363a8ab4424c17ed7aec0e8aefc4df86b3d (patch) | |
| tree | a2ff97bf3edd32eaac39ac66227d33960d1a33c7 | |
| parent | 3b256653ae9ab2cf56b21cb82a8bd2a562397b27 (diff) | |
| download | openembedded-core-53543363a8ab4424c17ed7aec0e8aefc4df86b3d.tar.gz openembedded-core-53543363a8ab4424c17ed7aec0e8aefc4df86b3d.tar.bz2 openembedded-core-53543363a8ab4424c17ed7aec0e8aefc4df86b3d.zip | |
busybox: mdev: Ensure /dev/initctl exists after tmpfs mount
During boot, there is a brief window during which /dev/initctl is
missing, which breaks initscripts that would need to access it. This
occurs because /etc/init.d/mountall.sh (rcS.d/S02...) attempts to ensure
/dev/initctl is present, but /etc/init.d/mdev (rcS.d/S06...) mounts over
/dev and clobbers the work done by mountall, and then does not wait
synchronously until initctl is ready before continuing.
To close this window, in /etc/init.d/mdev, we check whether /dev/initctl
is present, and if not, we remove it and recreate it. This is the same
thing that is done by /etc/init.d/mountall.sh, and we have verified that
any writers of /dev/initctl will wait synchronously until sysvinit
notices the change in fd and does the read, so no race exists.
Signed-off-by: Richard Tollerton <rich.tollerton@ni.com>
Signed-off-by: Ben Shelton <ben.shelton@ni.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
| -rwxr-xr-x | meta/recipes-core/busybox/files/mdev | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/meta/recipes-core/busybox/files/mdev b/meta/recipes-core/busybox/files/mdev index c4447ef160..96252477e0 100755 --- a/meta/recipes-core/busybox/files/mdev +++ b/meta/recipes-core/busybox/files/mdev @@ -7,3 +7,13 @@ mount -t devpts devpts /dev/pts touch /dev/mdev.seq echo "/sbin/mdev" > /proc/sys/kernel/hotplug mdev -s + +# +# We might have mounted something over /dev, see if /dev/initctl is there. +# +if test ! -p /dev/initctl +then + rm -f /dev/initctl + mknod -m 600 /dev/initctl p +fi + |