ext::Errno::ErrnoPerl3Programmers Referenext::Errno::Errno_pm(3p)NAMEErrno - System errno constants
SYNOPSIS
use Errno qw(EINTR EIO :POSIX);
DESCRIPTION
"Errno" defines and conditionally exports all the error con-
stants 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.
perl v5.8.8 2005-02-05 1