gbch-ripc - trace and clean GNUbatch IPC facilities
gbch-ripc [ -d ] [ -r ] [ -F ] [ -A ] [ -D secs ] [ -P psarg ] [ -G ] [ -n ] [ -o file ] [ -S dir ] [ -x ] [ -B n ] [ -N char ]
gbch-ripc traces, and/or optionally monitors or deletes IPC facilities for GNUbatch. Many of the facilities are used for debugging, but it also serves as a quick method of deleting the IPC facilities, being easier to use than ipcs and ipcrm, in the event that the scheduler has crashed or been killed without deleting the IPC facilities.
To use this facility, just run gbch-ripc thus:
gbch-ripc -d >/dev/null
The diagnostic output may be useful as it reports any inconsistencies.
The monitoring option can be used to diagnose processes, possibly not GNUbatch ones, which are interfering with GNUbatch shared memory segments, in cases where a third-party application is suspected of damaging the shared memory.
Gbch-ripc also checks for errors in memory-mapped files where the version of GNUbatch is using those rather than shared memory.
Display details of jobs and variables. This often generates a lot of output and is not really necessary.
Monitor which process has last attached to the job shared memory segment and report apparent corruption, polling every secs seconds.
Delete the IPC facilities after printing out contents. This saves messing with arguments to ipcrm(1).
Display the free chains for jobs and variables. This generates a lot of output and isn't usually necessary.
Suppress display from -D option if everything is OK.
Output to outfile rather than standard output. Set it to /dev/null if you don't want to see any output.
Specify argument to ps(1) to invoke if corruption detected when
monitoring with -D option. The output is passed through fgrep(1) to
find the line (if any) with the process id of the process which last
attached to the shared memory.
Used in conjunction with the -P option, the output from ps(1) is
displayed in full, without passing it through fgrep(1).
Read and display the entries on the message queue. This is normally suppressed because they can't be ``peeked at'' or ``unread''.
This is only relevant for versions of GNUbatch which use memory-mapped files rather than shared memory. It specifies the location of the spool directory. If this is not specified, then the master configuration file gnubatch.conf is consulted to find the spool directory location, or failing that, the default directory is used.
Dump the contents of shared memory or memory-mapped files in hexadecimal and ASCII characters.
Where n may be 1 to 8, specify the width of the hexadecimal dump output as a number of 32-bit words.
Replace the character in the ASCII part of the hexadecimal dump to
represent non-ASCII characters with the specified character (the first
character of the argument). The default is ..
To specify a space, you may need to use quotes thus:
-N ' '
To delete all IPC facilities after GNUbatch has crashed.
gbch-ripc -d -o /dev/null
To monitor the job shared memory segment for errors, printing out the
ps(1) output (where the full listing is obtained with -ef) search
for the process id of the last process to attach to the segment. Print
out the contents of the segment including in hexadecimal after
corruption is detected.
gbch-ripc -D 30 -P -ef -o joblog -A -x
gbch-start(1). btsched(8).
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.
John M Collins, Xi Software Ltd.