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Full Discussion: How to monitor if a process is running
Top Forums Programming How to monitor if a process is running Post 10461 by nahaz on Wednesday 14th of November 2001 02:34:54 PM
Old 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 Smilie

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 OSX

pcastctl

pcastctl(8)						    BSD System Manager's Manual 					       pcastctl(8)

NAME

     pcastctl -- Podcast Producer daemons control interface

SYNOPSIS

     pcastctl status target on|off|start|stop|restart

OPTIONS

     The available options are as follows:

     status			    print status of running daemons

     target			    affect agent or server daemon

     start|stop|restart 	    explicitly start/stop/restart daemon.  Note that 'restart' will kill all instances of a given daemon, as will
				    'stop' if none is specified in the pid file.

RETURN VALUES

     0 Completed succesfully.

     1 Action failed

     10 Not run as root.

     50 Target not recognized: use 'a', or 's'.

     51 Action not recognized: use start|stop|restart

     52 Executables not found; may need to reinstall Podcast Producer.

     53 Process directory not found; may need to reinstall Mac OS X.

     54 Timeout waiting for action to complete.

     55 Launchd manipulation failure.

FILES

     /usr/libexec/podcastproducer/pcastagentd
	     Podcast Producer agent daemon

     /usr/share/podcastproducer/pcastserverd
	     Podcast Producer server daemon

     /var/run/pcastagentd.pid
	     Podcast Producer agent process ID

     /var/run/pcastserverd.pid
	     Podcast Producer server process ID

     /System/Library/LaunchDaemons/com.apple.pcastagentd.plist
	     Launchd agent daemon control file

     /System/Library/LaunchDaemons/com.apple.pcastserverd.plist
	     Launchd server daemon control file

EXAMPLES

     status of Podcast Producer agent daemon

	   $ pcastctl agent status

     edit launchd configuration to launch server on system startup

	   $ pcastctl server on

DIAGNOSTICS

     Warning: Warning: ## copies of (pcastagentd|pcastserverd) already running

     Trying to launch another daemon when one or more already running; will usually succeed, but may cause unpredictable behavior.
     See also RETURN VALUES, above.

ERRORS

     Error: failed to launch (executable)

     Tried to start/restart a give daemon, but failed.

     Error: process 'executable' not currently running

     Tried to kill a process which did not exist.

SEE ALSO

     pcast(1) launchd(8)

HISTORY

     This program was first introduced in Mac OS X 10.5 "Leopard".  It was inspired by xgridctl(8).

BUGS

     pcastctl(8) uses kill -TERM to allow the daemons a chance to die gracefully; there is currently no way to force a kill -KILL.

     Bug reports can be sent to bugreport.apple.com

     Feedback can be sent to podcastproducer@apple.com

Mac OS								September 29, 2004							    Mac OS
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