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Full Discussion: How to check if process is running?
Special Forums UNIX and Linux Applications How to check if process is running? Post 302417237 by ladyAnne on Thursday 29th of April 2010 04:41:15 AM
Old 04-29-2010
---------- Post updated at 03:41 AM ---------- Previous update was at 01:23 AM ----------

[/COLOR]I have altered my script a bit .... now I get syntax errors.

To me this script looks fine.

Can somebody please assist me in finding what the problem is.

Thank you

Code:
 
#!/bin/bash
#---------------------------------------------------------------------------------------------------------------------- 
#This script allows the user to import a dsx file 
#
# Usage:
#./import.sh -s -d -r -f
#
#-----------------------------------------------------------------------------------------------------------------------
dbname="$dbname"
dsn="$dsn"
dsxfile="$dsxfile"
rangechk="$rangechk"
verbose=""
reverb=""
module=`basename $0`
DSXLOG_MODULE=$module 
export DSXLOG_MODULE
dsxdir="/var/local/dsx/import"
dsximp="/usr/local/bin/dsximp.exe"
dsxpids="/var/run"
function rm_pidfile
{ 
rm -f $dsxpids/$module.pid 
} 
function is_running 
{ 
# File does not exist, we can run 
[ -f $dsxpids/$module.pid ] || return 1 
# Read PID from file 
read PID < -f $dsxpids/$module.pid 
# File exists but process does not. 
[ -d /proc/${PID} ] || return 1 return 0 
} 
#------------------------------------------------------------------------#
# This guarantees other scripts will wait for each other 
# before checking the pidfile. otherwise one might create the PID 
# file while we're not looking. 
#------------------------------------------------------------------------#
while ! mkfifo -f $dsxpids/$module.lock 2> /dev/null 
do sleep 1 done 
#------------------------------------------------------------------------#
# beyond this point, /var/run/import.sh.lock exists and belongs to us. 
# Other instances of the script will loop. 
#------------------------------------------------------------------------#
if is_running then echo "An instance(PID ${PID}) is already running"
rm -f $dsxpids/$module.lock 
exit 1
fi
echo "$$" > -f $dsxpids/$module.pid
trap "rm_pidfile" EXIT
rm -f $dsxpids/$module.lock
while true do sleep 1 done
function displayHelp()
{
echo ""
echo " Usage: ./import.sh [ -s -d -r -f ]"
echo ""
echo " -s, --dsn identified by the Data Source Name "
echo " -d, --dbname identified by the Database Name "
echo " -r, --rangechk specify range checking option " 
echo " -f, --dsxfile identified by the file in dsx format "
echo " -h, --help identified by the help menu "
echo ""

}
while getopts " s: d: r: f: e h " option
do
case $option in

f ) dsxfile="$OPTARG";;
d ) dbname="$OPTARG";;
s ) dsn="$OPTARG";;
r ) rangechk="$OPTARG";;
e ) verbose="--verbose"
reverb="--echo";;
h | ? | * ) displayHelp;exit;;

esac;
done
if [[ $# -eq 0 ]]; then
displayHelp
exit 1
fi

 

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LEARN ABOUT HPUX

fsdaemon

fsdaemon(1M)															      fsdaemon(1M)

NAME

       fsdaemon - pass-through daemon for processing system commands

SYNOPSIS

       fork]
DESCRIPTION

       The  is	a user level daemon that provides a mechanism to pass information between applications and common commands and library functional-
       ity, allowing certain applications to dynamically add functionality to a system.  This is currently only supported for the class  of  APIs,
       such as:

       The  API are not yet publicly available, but the commands that use the mentioned APIs depend on this daemon to always be running in the HP-
       UX environments.

   Options
       When	 is started, indicates whether it should fork a child process and exit the parent process or run just as the  parent  process  and
		 not return.  A value of 1 for fork will make fork and exec a child process and then cause the parent process to exit.

       Kills the current running instance of

       Tests and waits until
		 is ready to process commands.	There is a window where could be started and not yet setup to process commands.  The caller should
		 invoke separately with the option to block until is ready to process commands.

       The entries to start are in the file.  These entries be present to ensure correct functionality of the system.  They should appear  as  one
       of the first entries in placing entries before entries in is dangerous and unsupported.

       The following are some of the HP-UX commands that use via the above APIs: and

RETURN VALUE
:
	0   Successful start of If invoked with the option, 0 is always returned.

       >0   Errno of failure that caused to fail to start.  This applies only if was started with the option.

ERRORS

       If  is not running, the errno will be returned by an application that invokes these APIs.  If this happens, please see your system adminis-
       trator to make sure is properly running.

EXAMPLES

       To start such that it can be invoked without permanently blocking the calling process:

       To kill the currently running instance of

       To check to see if the currently running instance of is ready and able to process requests sent to it:

       The following entries for starting should appear in the file:

WARNINGS

       The APIs are not yet publicly available, but the commands that use the mentioned family of APIs depend on this daemon to always be  running
       on  HP-UX  environments.  The administrator is not expected to invoke the command from the shell prompt; it should always be started via an
       entry in

       This manpage is provided for administrator's trouble shooting purposes, and to allow the system administrator to  repair  the  entries  for
       this daemon in case of corruption.

       The interface/options provided in this manpage are HP-UX release specific, and may be different in future releases.

AUTHOR

       was developed by HP.

SEE ALSO

       fstyp(1M), mkboot(1M), mount(1M), fstatfsdev(3C), fstatvfsdev(3C), statvfsdev(3C), statfsdev(3C), inittab(4).

																      fsdaemon(1M)
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