[Buildroot] Strange behavior with shell redirection
Cyril HAENEL
chaenel at free.fr
Fri Dec 18 13:37:45 UTC 2009
> What is the implementation of that "reboot"?
> Yours? Something else?
>
ls -l /sbin/reboot
lrwxrwxrwx 1 root root 14 Jul 14 12:12 /sbin/reboot ->
../bin/busybox
It's the busybox's reboot implementation
> It is very common that "reboot" does just exactly that, reboots.
> No file sync, no file closing, nothing but reboot.
>
> Try syncing the filesystem and unmounting it before rebooting.
> mount -o remount <no options> <device name>
> will flush the VFS buffers to disk if you don't have a "sync" available.
> umount <device name>
> often does not flush/sync the file system, it depends on the FS.
> So use both of the above commands -
>
In /etc/inittab, I have :
# Stuff to do before rebooting
null::shutdown:/usr/bin/killall klogd
null::shutdown:/usr/bin/killall syslogd
null::shutdown:/bin/umount -a -r
null::shutdown:/sbin/swapoff -a
The umount -a -r seem's to umount all mounted FS. But maybe for my jffs2
FS I also need to do a mount -o remount, I look at this, thank for the
idea !
But I am not convinced that is the problem, because the board can stay
alive for very long periodsof time, the log can reach several megabytes,
thus I can't believe there is not at least a small part of the previous
log at the next startup. I use jffs2 for that, if the FS is not
correctly unmounted because a power failure for example, files are safe
and contain at least the last version of the file before the power failure.
> As to your first question -
> Correct, wrong list; try a linux newbee forum.
>
I fact I am not a newbee at all in linux, if I asked my question here,
it's really because I now that the problem I have doesn't exist on my
laptop for example !!
Regards,
Cyril
--
Cyril Haenel
Registered Linux User #332632
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