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Full Discussion: Error code checking
Top Forums Shell Programming and Scripting Error code checking Post 302133011 by jepombar on Tuesday 21st of August 2007 12:21:56 PM
Old 08-21-2007
I'm doing it in perl

Sorry if I wasn't clear.
I need to create a folder and if there is any errors like permission errors I want to let the user know about it. However I don't wish to overwrite the folder if it already exists. Also I need to do it inside a Perl script.

This is the workaround I came up with:

`ls log 2> /dev/null`; #check if the folder exists
if($?) { #if it doesn't create it
`mkdir log`;
$dirFlag = 1; #flag to know that dir was created
}

The bad thing about this is that it wont let the user know if there were any permission errors. In other words, if the folder wasn't created for some reason the program will crash later when I try to write to that folder.

So what I want to do is to somehow check, in my Perl code, the error code that UNIX spits out. The problem is that I'm getting the same error code number for both "File Permission" and "File exists" errors.
 

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Mail::Box::Locker::FcntlLock(3pm)			User Contributed Perl Documentation			 Mail::Box::Locker::FcntlLock(3pm)

NAME
Mail::Box::Locker::FcntlLock - lock a folder using File::FcntlLock INHERITANCE
Mail::Box::Locker::FcntlLock is a Mail::Box::Locker is a Mail::Reporter SYNOPSIS
See Mail::Box::Locker DESCRIPTION
This locker object is uses File::FcntlLock, and was contributed by Jim in Aus. It is close to Mail::Box::Locker::POSIX, but does work on more systems, for instance Darwin. You will need to install File::FcntlLock separately: there is no dependency to it by the MailBox distribution. METHODS
Constructors Mail::Box::Locker::FcntlLock->new(OPTIONS) -Option --Defined in --Default expires Mail::Box::Locker 1 hour file Mail::Box::Locker undef folder Mail::Box::Locker <undef> log Mail::Reporter 'WARNINGS' method Mail::Box::Locker FcntlLock timeout Mail::Box::Locker 10 seconds trace Mail::Reporter 'WARNINGS' expires => SECONDS file => FILENAME folder => FOLDER log => LEVEL method => STRING|CLASS|ARRAY timeout => SECONDS|'NOTIMEOUT' trace => LEVEL The Locker $obj->filename([FILENAME]) See "The Locker" in Mail::Box::Locker $obj->folder([FOLDER]) See "The Locker" in Mail::Box::Locker $obj->name() See "The Locker" in Mail::Box::Locker Locking $obj->hasLock() See "Locking" in Mail::Box::Locker $obj->isLocked() $obj->lock() $obj->unlock() See "Locking" in Mail::Box::Locker Error handling $obj->AUTOLOAD() See "Error handling" in Mail::Reporter $obj->addReport(OBJECT) See "Error handling" in Mail::Reporter $obj->defaultTrace([LEVEL]|[LOGLEVEL, TRACELEVEL]|[LEVEL, CALLBACK]) Mail::Box::Locker::FcntlLock->defaultTrace([LEVEL]|[LOGLEVEL, TRACELEVEL]|[LEVEL, CALLBACK]) See "Error handling" in Mail::Reporter $obj->errors() See "Error handling" in Mail::Reporter $obj->log([LEVEL [,STRINGS]]) Mail::Box::Locker::FcntlLock->log([LEVEL [,STRINGS]]) See "Error handling" in Mail::Reporter $obj->logPriority(LEVEL) Mail::Box::Locker::FcntlLock->logPriority(LEVEL) See "Error handling" in Mail::Reporter $obj->logSettings() See "Error handling" in Mail::Reporter $obj->notImplemented() See "Error handling" in Mail::Reporter $obj->report([LEVEL]) See "Error handling" in Mail::Reporter $obj->reportAll([LEVEL]) See "Error handling" in Mail::Reporter $obj->trace([LEVEL]) See "Error handling" in Mail::Reporter $obj->warnings() See "Error handling" in Mail::Reporter Cleanup $obj->DESTROY() See "Cleanup" in Mail::Box::Locker $obj->inGlobalDestruction() See "Cleanup" in Mail::Reporter DIAGNOSTICS
Warning: Folder $folder already lockf'd Error: Package $package does not implement $method. Fatal error: the specific package (or one of its superclasses) does not implement this method where it should. This message means that some other related classes do implement this method however the class at hand does not. Probably you should investigate this and probably inform the author of the package. Error: Unable to check lock file $filename for $folder: $! To check whether the filename is used to flock a folder, the file must be opened. Apparently this fails, which does not mean that the folder is locked neither that it is unlocked. Error: Unable to open FcntlLock lock file $filename for $folder: $! For FcntlLock style locking, a folder it must be opened, which does not succeed for the specified reason. Error: Will never get a FcntlLock lock at $filename for $folder: $! Tried to lock the folder, but it did not succeed. The error code received from the OS indicates that it will not succeed ever, so we do not need to try again. SEE ALSO
This module is part of Mail-Box distribution version 2.105, built on May 07, 2012. Website: http://perl.overmeer.net/mailbox/ LICENSE
Copyrights 2001-2012 by [Mark Overmeer]. For other contributors see ChangeLog. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See http://www.perl.com/perl/misc/Artistic.html perl v5.14.2 2012-05-07 Mail::Box::Locker::FcntlLock(3pm)
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