login makes /dev/ttySx inaccessible to intended owners

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In article <9601240233.AA12237@sun1.lrz-muenchen.de>
Pilch <ucc02aa@sunmail.lrz-muenchen.de> wrote:

> Suppose user ebruehl of group ebsh logged in to my system by modem.  
> After logging out he will leave the modem device owner status changed:

> lrwxrwxrwx   1 uucp	uucp            5 Aug 20 11:58 /dev/modem -> ttyS1
> crw-rw----   1 ebruehl  ebsh       4,  65 Jan 23 12:38 /dev/ttyS1

> I want these devices to be accessible to a special group of non-root
> users, which is not the same as ebsh.  Now these users can no longer
> send faxes, as soon as somebody logged in.

You should not use /dev/modem as a symbolic link, but use /dev/ttyS1
direct.  mgetty tries to reset the device to the right
owner/permissions, but mgetty does not see, that /dev/modem is a link,
so it changes the owner/permission of /dev/modem and /dev/ttyS1 keeps
changed...

Ciao

        Roland

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