/dev/ttyS0 console user

[FunkyRes]

Howdy -

I need the serial port to be available to the console user.
IE console user (first to log in) has permission to read/write to it.

I've set that up before ages ago - in RH 8 - but I don't remember what I did and I think HAL has changed how it is done.

Any pointers appreciated.

[sideways]

You can use agetty in inittab, add something like

S0:2345:respawn:/sbin/agetty -w 9600 ttyS0

Here's an example for connecting a vt100
http://www.linux.com/howtos/Remote-S...y-agetty.shtml

[sideways]

Unless you just mean you want the port set up for access (no terminal connected), then you can issue a 'setserial /dev/ttyS0 <parameters>' command in rc.local, and change the permissions on /dev/ttyS0 so your user can access it (probably best to create a group and add the user to the group rather than allowing open access EDIT, or just add the user to the uucp group - I just noticed that this group has rw access on /dev/ttyS* by default)

[FunkyRes]

There was in RH the concept of a console user - which was set to the first user to log into a physical console. Log in via ssh and even if no one else is logged in, it does not get reset.

I get the distinct impression Fedora still does that:

[mpeters@atlantis ~]$ ls -l /dev/ |grep mpeters
crw------- 1 mpeters root    14,   12 Feb 14 02:38 adsp
crw------- 1 mpeters root    14,    4 Feb 14 02:38 audio
crw------- 1 mpeters root     5,    1 Feb 14 02:38 console
crw------- 1 mpeters root    14,    3 Feb 14 02:38 dsp
brw-rw---- 1 mpeters floppy   2,    0 Feb 14 02:38 fd0
brw-rw---- 1 mpeters floppy   2,   84 Feb 14 02:38 fd0u1040
*snip*
srwx------ 1 mpeters root           0 Feb 14 02:38 gpmctl
crw------- 1 mpeters root    14,    2 Feb 14 02:38 midi
crw------- 1 mpeters root    14,    0 Feb 14 02:38 mixer
crw------- 1 mpeters root    14,    1 Feb 14 02:38 sequencer
crw------- 1 mpeters root    14,    8 Feb 14 02:38 sequencer2

That's the right way to do it and is better than setting a group - as it insures only the console user has elevated privileges with the device.

I'll look in the /etc/udev directory and see if I can figure out how to do it.

[FunkyRes]

I think I figured it out - rebooting to test

[FunkyRes]

Yes - I got it figured out.

I created the file

/etc/security/console.perms.d/51-custom.perms

containing the following:

# device classes -- these are shell-style globs
<garmin>=/dev/ttyS0

# permission definitions
<console> 0600 <garmin> 0660 root.uucp

After a reboot:

[mpeters@atlantis ~]$ ls -l /dev/ttyS*
crw------- 1 mpeters uucp 4, 64 Feb 14 05:19 /dev/ttyS0
crw-rw---- 1 root    uucp 4, 65 Feb 14 05:19 /dev/ttyS1
crw-rw---- 1 root    uucp 4, 66 Feb 14 05:19 /dev/ttyS2
crw-rw---- 1 root    uucp 4, 67 Feb 14 05:19 /dev/ttyS3

So I'm golden

[sideways]

what's the difference between that and doing

chown mpeters:uucp /dev/ttyS0

in fact why not just add mpeters to the uucp group as suggested?

[sideways]

Ok, I think I get it now. You want whoever logs in to the local console to have access to ttyS0, so after you log out if someone else logs in (non-root) they also can access the port

http://www.redhat.com/docs/manuals/l...m-console.html

Glad you were able to sort it and help me understand a bit more.