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anderiv
Tux's lil' helper
Joined: 29 Mar 2004
Posts: 79
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 Posted: Mon Aug 22, 2005 1:29 pm Post subject: Allow non-root users to write to /dev/ttyS0 |
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What's the easiest way to allow non-root users to write to a serial port? I've tried using chgrp/chmod to change the permissions, but it doesn't appear that the kernel will allow you to do that. Here's my info:
- kernel-2.6.7-gentoo-r11
- devfsd-1.3.25-r8 (yes I know...switching to udev isn't an option on this system)
Thanks! |
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fangorn
Veteran
Joined: 31 Jul 2004
Posts: 1886
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| Posted: Mon Aug 22, 2005 1:44 pm Post subject: |
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AFAIK there is a "serial" group to provide this feature. Make sure youre user is in the serial group and you should be done. Or is it called "modem", no I think that was suse  |
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anderiv
Tux's lil' helper
Joined: 29 Mar 2004
Posts: 79
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| Posted: Mon Aug 22, 2005 2:04 pm Post subject: |
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| fangorn wrote: | | AFAIK there is a "serial" group to provide this feature. Make sure youre user is in the serial group and you should be done. Or is it called "modem", no I think that was suse |
Hrm - I have no serial group. There is a "tty" group, which I added my user to, but that didn't help. |
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pmn
n00b
Joined: 25 Mar 2005
Posts: 17
Location: Helsinki
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| Posted: Mon Aug 22, 2005 4:40 pm Post subject: |
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What is the group that is set to /dev/ttyS0 on boot? And the mode?
I mean if the mode is 660 or similiar you should be able to write to /dev/ttyS0 by adding user to that group that 'owns' this device. (Just like fangorn said).
In my gentoo system it is "tty":
| Code: | root@barton ~ $ ls -la /dev/ttyS0
lrwxrwxrwx 1 root root 5 Aug 20 14:01 /dev/ttyS0 -> tts/0
root@barton ~ $ ls -la /dev/tts/0
crw-rw---- 1 root tty 4, 64 Aug 20 14:01 /dev/tts/0
root@barton ~ $ |
After adding non-root user to group "tty" (or what it is on your system) try relogin the user. |
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