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Full Discussion: How to check if a unix text file is being accessed?
Top Forums UNIX for Dummies Questions & Answers How to check if a unix text file is being accessed? Post 26480 by oombera on Monday 19th of August 2002 02:42:40 PM
Old 08-19-2002
flock command in perl
I'm not sure if you use an error subroutine in case the file cannot be opened, closed, etc, but here's one possible way to code this:
Code:
open (file_label, "file_path") || Error('open', 'file');
flock (file_label, 1) || Error('lock', 'file');
my @array_name = <file_label>;
close (file_label) || Error ('close', 'file');

sub Error {
 print "Content-type: text/html\n\n";
 print "The server can't $_[0] the $_[1] : $! \n";
 exit;
}

This will request shared access to a file in order to read from it and then will store the whole file in an array.

Replace the '1' in the flock() command with a '2' if you want to request exclusive access to a file, in order to write to it.

added code tags for readability
Last edited by oombera; 02-19-2004 at 02:44 PM..
 

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LEARN ABOUT OSX

test::script

Test::Script(3) 					User Contributed Perl Documentation					   Test::Script(3)

NAME

       Test::Script - Basic cross-platform tests for scripts

DESCRIPTION

       The intent of this module is to provide a series of basic tests for 80% of the testing you will need to do for scripts in the script (or
       bin as is also commonly used) paths of your Perl distribution.

       Further, it aims to provide this functionality with perfect platform-compatibility, and in a way that is as unobtrusive as possible.

       That is, if the program works on a platform, then Test::Script should always work on that platform as well. Anything less than 100% is
       considered unacceptable.

       In doing so, it is hoped that Test::Script can become a module that you can safely make a dependency of all your modules, without risking
       that your module won't on some platform because of the dependency.

       Where a clash exists between wanting more functionality and maintaining platform safety, this module will err on the side of platform
       safety.

FUNCTIONS

   script_compiles
	   script_compiles( 'script/foo.pl', 'Main script compiles' );

       The "script_compiles" test calls the script with "perl -c script.pl", and checks that it returns without error.

       The path it should be passed is a relative unix-format script name. This will be localised when running "perl -c" and if the test fails the
       local name used will be shown in the diagnostic output.

       Note also that the test will be run with the same perl interpreter that is running the test script (and not with the default system perl).
       This will also be shown in the diagnostic output on failure.

   script_runs
	   script_runs( 'script/foo.pl', 'Main script runs' );

       The "script_runs" test executes the script with "perl script.pl" and checks that it returns success.

       The path it should be passed is a relative unix-format script name. This will be localised when running "perl -c" and if the test fails the
       local name used will be shown in the diagnostic output.

       The test will be run with the same perl interpreter that is running the test script (and not with the default system perl). This will also
       be shown in the diagnostic output on failure.

SUPPORT

       All bugs should be filed via the bug tracker at

       http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Test-Script <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Test-Script>

       For other issues, or commercial enhancement and support, contact the author.

AUTHOR

       Adam Kennedy <adamk@cpan.org>

SEE ALSO

       prove, <http://ali.as/>

COPYRIGHT

       Copyright 2006 - 2009 Adam Kennedy.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

       The full text of the license can be found in the LICENSE file included with this module.

perl v5.16.2							    2009-11-23							   Test::Script(3)
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