Provided by: gnuspool_1.7_i386 bug

NAME

       spshed - spool scheduler

SYNOPSIS

       spshed [ options ]

DESCRIPTION

       spshed is the spool scheduler process for the GNUspool spooler and
       document management system.

       To start GNUspool, spshed should be started. This should normally be
       done using gspl-start(1), which restarts it and passes the appropriate
       options. This may be put within the Operating System startup scripts.

       Likewise to halt it, gspl-stop(1) should be invoked. This should be
       put, using the -y option, in any system shutdown routines.

       If you do need to kill spshed for any reason, first try kill(1) without
       any -9 option. This will give spshed the opportunity to attempt to tidy
       up any IPC facilities before shutting down.

       Information, either in respect of other machines to connect to, or pre-
       existing jobs and printers on the current machine, are read from the
       files gnuspool.hosts and the spool directory respectively.

       If a networked version of GNUspool is being run, then a "slave" spshed
       process is spawned to monitor and process incoming network messages.
       Incoming remotely-submitted jobs and API interfaces are handled via a
       separate process xtnetserv(8), which is also invoked as appropriate by
       gspl-start(1).

       Appropriate log messages are written by spshed and other system
       processes to a log file, spshed_reps. Be sure to check this file for
       any error messages relevant to any problems you encounter.

FILES

       gnuspool.hosts host names and descriptions

       gnuspool.conf master configuration file

       int-config message file

       spshed_jfile job file

       spshed_pfile printer file

       spshed_reps error log file

       spufile0 user data

       charges0 user charges data

       spmm_jobi job memory-mapped hash file

       spmm_jobd job memory-mapped data file

       spmm_ptrs printers memory-mapped file

       spmm_xfer communication buffer memory-mapped file

ENVIRONMENT

       SPOOLDIR
           alternative location for spool directory.

       SPHELPDIR
           alternative location for help file directory.

       SPROGDIR
           alternative location for internal programs directory.

IPC FACILITIES

       An IPC message queue, with key 0x58691000 and owned by "spooler", is
       created by spshed and used to receive messages from user processes,
       pass instructions to spd(8), and to pass internal messages from the
       slave spshed process to the master.

       Two shared memory segments are created to hold details of jobs and
       printers. As the shared memory facility provides no facilities for
       growth, then additional shared memory segments may be created if the
       job and printer lists expand sufficiently and the original ones
       deallocated.

       The keys given to the shared memory segments start at 0x58691002 and
       ascend upwards to 0x58691064 before wrapping around.

       A further shared memory segment, with key 0x58692002 is created to hold
       details of pending jobs before transfer to the main shared memory
       segment.

       Versions of spshed may use memory-mapped files rather than shared
       memory. The files are held in the spool directory, by default
       /var/spool/gnuspool, and have the names spmm_jobi, spmm_jobd, spmm_ptrs
       and spmm_xfer.

       A set of 5 semaphores, with the key 0x58691001 is created to interlock
       access to the shared memory segments.

       The presence or absence of these IPC facilities is used by spshed and
       other programs to determine whether a previous copy of itself is
       running. If spshed is abnormally terminated, it will probably be
       necessary to delete these IPC facilities before spshed can be
       restarted.

       When printers are set running, spshed invokes an instance of spd(8) to
       control each printer. Mail and attention messages are passed to
       spmdisp(8) for processing.

INTERNET PORTS

       spshed accepts and sends interconnections from other machines on TCP
       port, passes the contents of spool files on a further TCP port, and
       undertakes "probes" on a UDP port.

       The port numbers are set up in the /etc/services file when GNUspool is
       first installed.

SEE ALSO

       gspl-pr(1), gspl-pq(1), gspl-puser(1), gspl-qdel(1), gspl-qchange(1),
       gspl-qlist(1), gspl-plist(1), gspl-charge(1), gspl-start(1),
       gspl-stop(1), gnuspool.conf(5), gnuspool.hosts(5), gspl-cjlist(8),
       gspl-cplist(8), dosspwrite(8), ripc(8), spd(8), spdinit(8), spmdisp(8),
       spwrite(8), gspl-spuconv(8), xtnetserv(8).

DIAGNOSTICS

       spshed is invoked from system startup procedures or other programs such
       as gspl-start(1). Thereafter it runs as a "daemon process" and
       diagnostics are not written to any terminal but to the file
       spshed_reps.

       In the event of any problems this file should be examined.

COPYRIGHT

       Copyright (c) 2009 Free Software Foundation, Inc.  This is free
       software. You may redistribute copies of it under the terms of the GNU
       General Public License <http://www.gnu.org/licenses/gpl.html>.  There
       is NO WARRANTY, to the extent permitted by law.

AUTHOR

       John M Collins, Xi Software Ltd.