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atemv
n00b
Joined: 09 Aug 2014
Posts: 63
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 Posted: Mon Oct 19, 2015 6:34 pm Post subject: ACC permissions changed on /dev/null |
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Hello evryone!
The ACC on my /dev/null chaged to:
| Code: | | -rw------- 1 root root 19 Oct 19 19:51 null |
from the previous state what I can not recall.. maybe:
| Code: | | -rw-rw-rw- 1 root root 0 Oct 19 20:00 /dev/null |
I fixed it with:
| Code: | | chmod 666 /dev/null |
But I am more than curious about the reason...
Any suggestion?
Leads:
I established a very basic FIFO connection between Blender and Emacs when the problem occurred. |
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khayyam
Watchman
Joined: 07 Jun 2012
Posts: 6227
Location: Room 101
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| Posted: Mon Oct 19, 2015 7:38 pm Post subject: Re: ACC permissions changed on /dev/null |
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| atemv wrote: | | Code: | | -rw------- 1 root root 19 Oct 19 19:51 null |
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atemv ... well, for whatever reason, its not a 'character device' (indicated by 'c' in the first field of the output).
| Code: | # ls -l /dev/null
crw-rw-rw- 1 root root 1, 3 2015-10-05 08:45 /dev/null
# file /dev/null
/dev/null: character special (1/3) |
I'm not sure how you are creating the device, perhaps your fifo clobbered it .... anyhow:
| Code: | | # mknod /dev/null c 1 3 |
HTH & best ... khay |
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 47128
Location: 56N 3W
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| Posted: Mon Oct 19, 2015 7:43 pm Post subject: |
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atemv,
Thats not fixed it, its marginally less broken.
| Code: | $ ls -l /dev/null
crw-rw-rw- 1 root root 1, 3 May 12 2013 /dev/null |
/dev/null is a character special device. Thats the c in crw-rw-rw- above.
You have a normal file.
It you need to make any device nodes by hand, you must use mknod.
A reboot should fix it as for most users /dev is a fake filesystem in RAM and is recreated every boot.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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atemv
n00b
Joined: 09 Aug 2014
Posts: 63
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| Posted: Tue Oct 20, 2015 10:14 am Post subject: |
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| NeddySeagoon wrote: | atemv,
/dev/null is a character special device. Thats the c in crw-rw-rw- above.
You have a normal file.
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Thanks I got it, however I am very curious about the reason. I will tinker with similar things today, maybe it will reproduce the error. |
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 47128
Location: 56N 3W
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| Posted: Tue Oct 20, 2015 4:42 pm Post subject: |
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atemv,
Whatever trashed your /dev/null was running as root, since it created a root owned ordinary file.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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