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Full Discussion: checking for a running process from korn cron
Top Forums Shell Programming and Scripting checking for a running process from korn cron Post 70544 by blowtorch on Sunday 1st of May 2005 12:27:20 AM
Old 05-01-2005
Best way to implement this is to use a lock file. When the process starts up, have it look for a lock file (which should be a unique file name). If the file exists, the process can just exit. Otherwise, the process can touch the file and proceed to do its job. Just before exiting the process will remove the file.

Code:
#!/bin/sh
LOCKFILE=/tmp/lockfile # just suppose some name
if [ -f $LOCKFILE ]; then
exit
fi
touch $LOCKFILE  # create your lockfile so that any process starting up after 
                        # will find the file and exit
### start doing what you really want to do here
.
.
.
### end what ever you are doing here
rm -f $LOCKFILE
exit

 

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LEARN ABOUT DEBIAN

rlock

RLOCK(1)						      General Commands Manual							  RLOCK(1)

NAME

       rlock - run program with a lockfile

SYNOPSIS

       rlock [options] lockfile program [args]

       rlock [options] lockfile -- program options [args]

DESCRIPTION

       rlock creates NFS safe lockfiles.  it can optionally run a program while holding the lock, ensuring lockfile removal on program exit.  if a
       program is specified to be run rlock will spawn a background thread to kept the lockfile 'fresh' by touching it at a regular interval.	in
       this  way a lease is maintained on the lockfile and other processes attempting to obtain the lock can determine that it is in use.  see the
       '--refresh' option for how to control the touch interval.  any other process trying to obtain a lock  will  automatically  remove  a  stale
       lockfile; a stale lockfile is one that is older than a certain age.  this age be controled via the '--max_age' option.

ENVIRONMENT

       LOCKFILE_DEBUG=1
	      causes internal actions of the library to be shown on STDERR.

DIAGNOSTICS

       rlock attempts to exit with the status of 'program' except where it cannot due to exceptional conditions.  in addition the message

       'RLOCK SUBCOMMAND FAILURE'

       will be printed on STDERR if 'program' exits with non-zero status.

AUTHOR

       lockfile was written by Ara T. Howard <ara.t.howard@noaa.gov>.

       This manual page was converted by Decklin Foster <decklin@red-bean.com> for the Debian project (but may be used by others).

								    2008-10-11								  RLOCK(1)
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