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Programming
How to monitor if a process is running
Post 10461 by nahaz on Wednesday 14th of November 2001 02:34:54 PM
11-14-2001
While this response doesn't really belong in the C Programming section, the best way that I can see to ensure that your process runs all the time would be to write some sort of wrapper shell script to run the program with. Here is how you could do it in perl:
<hr noshade>
#!/usr/bin/perl
use strict;
my $OLIBA_CMD = '/[path to oliba here]/oliba';
my $SLEEP_TIME = 5; # check to see if it is running every 5 seconds
while(1)
{
my @pid_array = `ps -ef | grep [o]liba`; # thanks Perderabo
my $pid_count = scalar(@pid_array);
if ($pid_count == 0)
{
# uh oh it isn't running
system "$OLIBA_CMD"; # run it
}
elsif ($pid_count > 1)
{
# There is more than one instance running?
# code to mail the admin or something in here
}
sleep $SLEEP_TIME;
}
<hr noshade>
Hope this helps.
<hr noshade>
#!/usr/bin/perl
use strict;
my $OLIBA_CMD = '/[path to oliba here]/oliba';
my $SLEEP_TIME = 5; # check to see if it is running every 5 seconds
while(1)
{
my @pid_array = `ps -ef | grep [o]liba`; # thanks Perderabo
my $pid_count = scalar(@pid_array);
if ($pid_count == 0)
{
# uh oh it isn't running
system "$OLIBA_CMD"; # run it
}
elsif ($pid_count > 1)
{
# There is more than one instance running?
# code to mail the admin or something in here
}
sleep $SLEEP_TIME;
}
<hr noshade>
Hope this helps.
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LEARN ABOUT OSF1
uudemon
uudemon(4) Kernel Interfaces Manual uudemon(4) NAME
uudemon.admin, uudemon.cleanu, uudemon.hour, uudemon.poll - Administrative shell scripts for polling remote systems, cleaning up spool directories, reporting status to the system administrator, and routine invocations of the uuxqt and uusched daemons SYNOPSIS
These shell scripts reside in the following directory: /usr/lib/uucp DESCRIPTION
All the scripts can be run from the command line or can be run automatically by the cron daemon. To automatically run the scripts, remove the comment character (#) from the beginning of the relevant line in the /var/spool/cron/crontabs/uucp file. This script reports status to the system administrator. It issues the uustat command to find out the status of uucp jobs. It mails the results to the uucp login ID. The script may be modified to send mail to any login ID such as the uucp administrative login ID (uucpa) or root. This script cleans up the /var/spool/uucp and /var/spool/uucppublic directories by running the uucleanup command. The uucleanup com- mand is run with the following parameters: -C7, -D7, X2, -o2, -W1. This script runs the uusched and uuxqt daemons in the background. This script polls the systems listed in the /usr/lib/uucp/Poll file. The uudemon.poll script should be scheduled before the uudemon.hour script. This allows uudemon.poll to create any command files before cron runs the uudemon.hour script. FILES
Contains the uudemon.admin, uudemon.cleanu, uudemon.hour and uudemon.poll files. Contains the uucp file. RELATED INFORMATION
Commands: cron(8), uucleanup(8), uusched(8), uuxqt(1) Files: /usr/lib/uucp delim off uudemon(4)