11-26-2005
Quote:
Originally Posted by Neo
Yes, it is possible. Many people used "Lock Files" as ad hoc semaphores to accomplish this task.
thx reply,
could advise how to do that ? thx
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LEARN ABOUT SUSE
faxq-helper
faxq-helper(1) mgetty+sendfax manual faxq-helper(1)
NAME
faxq-helper - privileged helper process to access the fax queue
SYNOPSIS
faxq-helper <command> [<options>]
DESCRIPTION
faxq-helper is part of the internal workings of faxspool(1).
Formerly, the /var/spool/fax/outgoing directory was world-writeable, leading to all sort of funny symlink attacks against faxspool(1) and
faxrunq(8).
These days, it's owned by the user ``fax'', and only this user can write to it. To be able to put jobs there, faxspool(1) calls faxq-
helper for very clearly defined purposes:
- make a new queue directory
- put a new fax G3 file into this queue directory
- put a JOB file into this queue directory, and activate the fax job
and possibly:
- remove a fax job from the queue (to be used by faxrm and in case of errors)
- re-queue a job that has been suspended due to repeated failures (faxq -r)
To achieve this, faxq-helper is installed set-user-id fax. If you remove the suid bit, or chown the fax queue directory to a different
user, it will stop working.
RETURN VALUES
faxq-helper has the following exit() values:
0 everything went fine
1 invalid JOB ID specified on the command line
2 some problem with the directory setup of the outgoing queue dir, /var/spool/fax/outgoing (it will print a detailed error message)
3 some problems with the user ID setup of the ``fax'' user (it will print a detailed error message)
10 failure to process the specified command (it will print a detailed error message)
SEE ALSO
faxspool(1), faxq(1), faxrm(1), faxqueue(5)
AUTHOR
faxq-helper is Copyright (C) 2004-2006 by Gert Doering, <gert@greenie.muc.de>.
greenie 18 Feb 06 faxq-helper(1)