Backup script / Test if script is already running Post: 302644895

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Top Forums Shell Programming and Scripting Backup script / Test if script is already running Post 302644895 by Corona688 on Tuesday 22nd of May 2012 03:05:51 PM

05-22-2012

Registered User

A traditional way to tell if a service is already running is a PID file. Save the process ID in a temporary file and delete it on exit. If the PID file exists, and the PID is still valid, then another backup is running. Even if the process dies unexpectedly and doesn't delete, it should be able to cope since the odds of something else snapping up the same PID are small.

This is how services often work and much more reliable than trying to grub through ps's own text output for answers.

Code:

#!/bin/sh

if [ -f /tmp/myservice-pid ]
then
        read PID < /tmp/myservice-pid

        # Check if the PID in the file still exists
        # If it does, backup is running, and we should skip this round.
        if ps "$PID" >/dev/null 2>/dev/null
        then
                echo "Already running" >&2
                exit 1
        fi
fi

# Either create new file, or replace it with our own
echo $$ > /tmp/myservice-pid
# Delete it on exit just to be extra sure
trap "rm -f /tmp/myservice-pid" EXIT

# Continue below

...

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LEARN ABOUT FREEBSD

dtruss

DTRUSS(1)						    BSD General Commands Manual 						 DTRUSS(1)

NAME

     dtruss -- Trace system calls and userland stacks using DTrace

SYNOPSIS

     dtruss [-acdefholLs] [-t syscall] [-n name -p pid command]

DESCRIPTION

     The dtruss utility traces system calls and (optionally) userland stack traces for the specified programs.

     The following options are available:

     -p pid  Trace the process with PID pid.

     -n name
	     Trace the process with name name.

     -t syscall
	     Trace the specified syscall only.

     -a      Print all details.

     -c      Print syscall counts.

     -d      Print relative times (in microseconds).

     -e      Print elapsed times (in microseconds).

     -f      Follow the children processes.

     -l      Force printing PID / TID.

     -o      Print time spent on CPU.

     -s      Print userland stack backtraces.

     -L      Don't print PID / TID.

     -b bufsize
	     Specify the DTrace buffer size.

EXIT STATUS

     The dtruss utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     dtrace(1)

HISTORY

     The dtruss utility comes from the DTraceToolkit and was first imported into FreeBSD 9.0.

AUTHORS

     Brendan Gregg

BSD
								  August 26, 2010							       BSD