Process running? Stop it Post: 302500815

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Top Forums Shell Programming and Scripting Process running? Stop it Post 302500815 by Corona688 on Tuesday 1st of March 2011 03:35:35 PM

03-01-2011

Registered User

Quote:

Originally Posted by LukasB

Thank you! Sorry I am a newbie. So, the whole script would be like this?

Your code isn't that bad actually, there's just a few things to learn which will help simplify what you do. Remember you can use 'exit' to make the script quit at any time, which helps avoid n+1 levels of nested nesting.
Also get in the habit of bracketing and quoting your variables. The quotes prevent things from being split into several arguments when you end up with spaces in filenames and such. And the brackets let you "${put}_${together}_${variables}" when "$it_$wont_$work_$without_$them": (because _ is a valid char for a variable name, making it look for $it_ instead of $it, etc.

Code:

#!/bin/bash

PIDFILE="/tmp/php.pid"
PHPSCRIPT="/home/www/mydomain.com/subdomains/www/parser.php"

echo 'Checking php process from PID file'
# We can split this out to reduce the amount of nesting
if [ ! -f "$PIDFILE" ]
then
        echo "Hey no file - first time maybe?"
        # Don't need the & after $PIDFILE.
        php $PHPSCRIPT & echo $! > "$PIDFILE"
        # not all shells need this, but bash does
        disown
        # Script will quit here.
        exit 0
fi

# We know the PID file must exist to get to this point.

# cat is not needed here.  read and redirection are much more direct and efficient.
read PID < "$PIDFILE"

# Don't need to run ps and grep.
# All running processes will have directories under /proc.
# Things under /proc/ aren't really files and directories, it's a direct view
# of what the kernel believes is going on.
if [ -d "/proc/$PID" ]
then
        echo "php process still running - let us kill it!!!"
        kill "$PID" || echo "Couldn't kill $PID"
else
        echo "php process not running - crap!!!"
        rm -f "$PIDFILE"
        # You don't need the & after $PIDFILE.
        php "$PHPSCRIPT" & echo $! > "$PIDFILE"
        # not all shells need this, but bash does
        disown
fi

Ideally, your PHP script should be responsible for making, and deleting, its own PID file.

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LEARN ABOUT PHP

apd_breakpoint

APD_BREAKPOINT(3)							 1							 APD_BREAKPOINT(3)

apd_breakpoint - Stops the interpreter and waits on a CR from the socket

SYNOPSIS

       bool apd_breakpoint (int  $debug_level)

DESCRIPTION

	This  can be used to stop the running of your script, and await responses on the connected socket. To step the program, just send enter (a
       blank line), or enter a php command to be executed.

PARAMETERS

	      o $
		debug_level -An integer which is formed by adding together the XXX_TRACE constants.It is not recommended to use  MEMORY_TRACE.	It
		is  very  slow and does not appear to be accurate.  ASSIGNMENT_TRACE is not implemented yet.To turn on all functional traces (TIM-
		ING, FUNCTIONS, ARGS SUMMARY (like strace -c)) use the value 99

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      Typical session using tcplisten

	      bash#tcplisten localhost 7777

	      APD - Advanced PHP Debugger Trace File
	      ---------------------------------------------------------------------------
	      Process Pid (6118)
	      Trace Begun at Sun Mar 10 23:13:12 2002
	      ---------------------------------------------------------------------------
	      (  0.000000): apd_set_session_trace called at /home/alan/Projects/project2/test.
	      php:5
	      (  0.074824): apd_set_session_trace_socket() at /home/alan/Projects/project2/tes
	      t.php:5 returned.  Elapsed (0.074824)
	      (  0.074918): apd_breakpoint() /home/alan/Projects/project2/test.php:7
			    ++ argv[0] $(??) = 9
	      apd_breakpoint() at /home/alan/Projects/project2/test.php:7 returned.  Elapsed (
	      -2089521468.1073275368)
	      >

	      statement: /home/alan/Projects/project2/test.php:8
	      >

	      statement: /home/alan/Projects/project2/test.php:8
	      >

	      statement: /home/alan/Projects/project2/test.php:10
	      >apd_echo($i);
	      EXEC: apd_echo($i);
	      0
	      >apd_echo(serialize(apd_get_active_symbols()));
	      EXEC:  apd_echo(serialize(apd_get_active_symbols()));
	      a:47:{i:0;s:4:"PWD";i:1;s:10:"COLORFGBG";i:2;s:11:"XAUTHORITY";i:3;s:14:"
	      COLORTERM_BCE";i:4;s:9:"WINDOWID";i:5;s:14:"ETERM_VERSION";i:6;s:16:"SE
	      SSION_MANAGER";i:7;s:4:"PS1";i:8;s:11:"GDMSESSION";i:9;s:5:"USER";i:10;s:5:"
	      MAIL";i:11;s:7:"OLDPWD";i:12;s:5:"LANG";i:13;s:10:"COLORTERM";i:14;s:8:"DISP
	      LAY";i:15;s:8:"LOGNAME";i:16;s:6:"
	      >apd_echo(system('ls /home/mydir'));
	      >apd_continue(0);

PHP Documentation Group 													 APD_BREAKPOINT(3)