lpsched signals Post: 32475

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Top Forums UNIX for Advanced & Expert Users lpsched signals Post 32475 by TioTony on Tuesday 26th of November 2002 10:49:00 PM

11-26-2002

Registered User

lpsched signals

Hello,
I am sure this info is somewhere on the web but have not been able to find it via google or by searching this site. On HPUX we have a model script that runs a command to capture the spool file to a repository and doesn't actually physically print the spool file. This has been working fine for many years.
Today we found a strange quirk. If the print queue is disabled, the model script stops executing as expected but if the capture command is running, it continues to run until it completes. The return code from the capture command is not passed back to the model script (or the model script ignores it because it has been disabled). When the queue is enabled again, the job that was running when the queue was disabled is processed again. The lpsched man page (lpsched 1M on HP) mentions this behavior and this is the behavior I would expect from lpsched. The problem is the same spool file is being completely processed twice causing duplication in our repository.
So here comes the question. Does anyone know anyway I can send SIGTERM/SIGKILL/etc to the capture command when the queue is disabled by placing code in the same model script? In my case it would be approriate to kill the capture command if the queue is disabled. If this is not possible, how about the inverse - passing the success of the capture command back to model script thus completing the job so lpsched starts with the next job when the queue is enabled once again.
During some of my testing to figure this out, I have noticed that once a queue is disabled, any commands running from that model script seem to lose STDOUT and STDERR. Can anyone confirm this? I am doing more testing to see if I can prove otherwise.

Thanks,
TioTony

TioTony

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LEARN ABOUT ULTRIX

lpsched

lpsched(1M)						  System Administration Commands					       lpsched(1M)

NAME

       lpsched - start the LP print service

SYNOPSIS

       lpsched [-f num_filters] [-n num_notifiers] [-p fd_limit] [-r reserved_fds]

DESCRIPTION

       The  lpsched command  starts or restarts the  LP print service.

       The  lpshut command stops the  LP print service.  Printers that are restarted using lpsched reprint (in their entirety) print requests that
       were stopped by	lpshut. See  lpshut(1M).

       It is recommended that you start  and stop the LP print service using svcadm(1M).  See NOTES.

OPTIONS

       The following options are supported:

       -f num_filters	       Specifies the number of concurrent slow filters that may be run on a print server. A default value of 1 is used	if
			       none  is  specified. Depending on server configuration, a value of  1 may cause printers to remain idle while there
			       are jobs queued to them.

       -n num_notifiers        Specifies the number of concurrent notification processes that can run on a print server. A default value of  1	is
			       used when none is specified.

       -p fd_limit	       Specifies  the file descriptor resource limit for the  lpsched process. A default value of  4096 is used if none is
			       specified. On extremely large and active print servers, it may be necessary to increase this value.

       -r reserved_fds	       Specifies the number of file descriptors that the scheduler reserves for internal communications under heavy  load.
			       A  default  value  of   2  is  used  when none is specified. It should not be necessary to modify this value unless
			       instructed to do so when troubleshooting problems under high load.

EXIT STATUS

       The following exit values are returned:

       0	       Successful completion.

       non-zero        An error occurred.

FILES

       /var/spool/lp/*	       LP print queue.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWpsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       lp(1), svcs(1), lpstat(1), lpadmin(1M), lpmove(1M), lpshut(1M), svcadm(1M), attributes(5), smf(5)

       System Administration Guide: Basic Administration

NOTES

       The lpsched service is managed by the service management facility, smf(5), under the service identifier:

       svc:/application/print/server

       Administrative actions on this service, such as enabling, disabling, or requesting restart, can be performed  using  svcadm(1M).  The  ser-
       vice's status can be queried using the svcs(1) command.

SunOS 5.10							    3 Sep 2004							       lpsched(1M)