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Errno.3pm
Langue: en
Version: 2008-04-01 (mandriva - 01/05/08)
Section: 3 (Bibliothèques de fonctions)
NAME
Errno - System errno constantsSYNOPSIS
use Errno qw(EINTR EIO :POSIX);
DESCRIPTION
"Errno" defines and conditionally exports all the error constants defined in your system "errno.h" include file. It has a single export tag, ":POSIX", which will export all POSIX defined error numbers."Errno" also makes "%!" magic such that each element of "%!" has a non-zero value only if $! is set to that value. For example:
use Errno; unless (open(FH, "/fangorn/spouse")) { if ($!{ENOENT}) { warn "Get a wife!\n"; } else { warn "This path is barred: $!"; } }
If a specified constant "EFOO" does not exist on the system, $!{EFOO} returns "". You may use "exists $!{EFOO}" to check whether the constant is available on the system.
CAVEATS
Importing a particular constant may not be very portable, because the import will fail on platforms that do not have that constant. A more portable way to set $! to a valid value is to use:if (exists &Errno::EFOO) { $! = &Errno::EFOO; }
AUTHOR
Graham Barr <gbarr@pobox.com>COPYRIGHT
Copyright (c) 1997-8 Graham Barr. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre