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Full Discussion: Flock preventing function to work
Top Forums Shell Programming and Scripting Flock preventing function to work Post 302993663 by batchenr on Monday 13th of March 2017 09:23:26 AM
Old 03-13-2017
[SOLVED]Flock preventing function to work
Hi i have a script that check pings and i use flock to so the script wont run
multipul times :

its not the whole script but this is the idea :

Code:
(
flock -x -w 3 200 || exit 1
/usr/sbin/fping -c$count -i$interval -a $hosts > $FILE1  2>&1
) 200>/var/lock/.myscript.exclusivelock

now i made a function for debug before the flock starts :
Code:
function DEBUG() {
echo "
==============================
$(date)
=============================="
echo  "RSULTE:  $RESULTS"
}

and im calling DEBUG func inside the flock like this :

Code:
(
flock -x -w 3 200 || exit 1
/usr/sbin/fping -c$count -i$interval -a $hosts > $FILE1  2>&1
DEBUG
) 200>/var/lock/.myscript.exclusivelock


and it does not work. i can see that if i call DEBUG outside flock
it is writing in white and in flock its written in red

is there a special way to call function inside a flock ?

thanks
Last edited by batchenr; 03-15-2017 at 04:38 AM..
 

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LEARN ABOUT PHP

streamwrapper.stream_lock

STREAMWRAPPER.STREAM_LOCK(3)						 1					      STREAMWRAPPER.STREAM_LOCK(3)

streamWrapper::stream_lock - Advisory file locking

SYNOPSIS

       public bool streamWrapper::stream_lock (int  $operation)

DESCRIPTION

	This  method  is called in response to flock(3), when file_put_contents(3) (when $flags contains LOCK_EX), stream_set_blocking(3) and when
       closing the stream ( LOCK_UN).

PARAMETERS

	      o $operation
		-$operation is one of the following:

		     o LOCK_SH to acquire a shared lock (reader).

		     o LOCK_EX to acquire an exclusive lock (writer).

		     o LOCK_UN to release a lock (shared or exclusive).

		     o LOCK_NB if you don't want flock(3) to block while locking. (not supported on Windows)

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

ERRORS
/EXCEPTIONS
	Emits E_WARNING if call to this method fails (i.e. not implemented).

SEE ALSO

       stream_set_blocking(3), flock(3).

PHP Documentation Group 											      STREAMWRAPPER.STREAM_LOCK(3)
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