12-31-2008
same file being opened by two users at a time
I want to avoid a situation where because two users simultaneously
open a file and modify and save, leaving the original file in mess.
Is there a way in UNIX to warn a user if that particular file is already being
used by another user.
Thanks in advance
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LEARN ABOUT DEBIAN
perl::critic::policy::errorhandling::requirecarping
Perl::Critic::Policy::ErrorHandling::RequireCarping(3pm)User Contributed Perl DocumentatioPerl::Critic::Policy::ErrorHandling::RequireCarping(3pm)
NAME
Perl::Critic::Policy::ErrorHandling::RequireCarping - Use functions from Carp instead of "warn" or "die".
AFFILIATION
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION
The "die" and "warn" functions both report the file and line number where the exception occurred. But if someone else is using your
subroutine, they usually don't care where your code blew up. Instead, they want to know where their code invoked the subroutine. The Carp
module provides alternative methods that report the exception from the caller's file and line number.
By default, this policy will not complain about "die" or "warn", if it can determine that the message will always result in a terminal
newline. Since perl suppresses file names and line numbers in this situation, it is assumed that no stack traces are desired either and
none of the Carp functions are necessary.
die "oops" if $explosion; #not ok
warn "Where? Where?!" if $tiger; #not ok
open my $mouth, '<', 'food'
or die 'of starvation'; #not ok
if (! $dentist_appointment) {
warn "You have bad breath!
"; #ok
}
die "$clock not set.
" if $no_time; #ok
my $message = "$clock not set.
";
die $message if $no_time; #not ok, not obvious
CONFIGURATION
By default, this policy allows uses of "die" and "warn" ending in an explicit newline. If you give this policy an
"allow_messages_ending_with_newlines" option in your .perlcriticrc with a false value, then this policy will prohibit such uses.
[ErrorHandling::RequireCarping]
allow_messages_ending_with_newlines = 0
If you give this policy an "allow_in_main_unless_in_subroutine" option in your .perlcriticrc with a true value, then this policy will allow
"die" and "warn" in name space main:: unless they appear in a subroutine, even if they do not end in an explicit newline.
[ErrorHandling::RequireCarping]
allow_in_main_unless_in_subroutine = 1
BUGS
Should allow "die" when it is obvious that the "message" is a reference.
SEE ALSO
Carp::Always
AUTHOR
Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>
COPYRIGHT
Copyright (c) 2005-2011 Imaginative Software Systems. All rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license
can be found in the LICENSE file included with this module.
perl v5.14.2 2012-06-07 Perl::Critic::Policy::ErrorHandling::RequireCarping(3pm)