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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | =head1 NAME
Errno - System errno constants
=head1 SYNOPSIS
use Errno qw(EINTR EIO :POSIX);
=head1 DESCRIPTION
C<Errno> defines and conditionally exports all the error constants
defined in your system C<errno.h> include file. It has a single export
tag, C<:POSIX>, which will export all POSIX defined error numbers.
C<Errno> also makes C<%!> magic such that each element of C<%!> has a
non-zero value only if C<$!> is set to that value. For example:
use Errno;
unless (open(FH, "/fangorn/spouse")) {
if ($!{ENOENT}) {
warn "Get a wife!\n";
} else {
warn "This path is barred: $!";
}
}
If a specified constant C<EFOO> does not exist on the system, C<$!{EFOO}>
returns C<"">. You may use C<exists $!{EFOO}> to check whether the
constant is available on the system.
=head1 CAVEATS
Importing a particular constant may not be very portable, because the
import will fail on platforms that do not have that constant. A more
portable way to set C<$!> to a valid value is to use:
if (exists &Errno::EFOO) {
$! = &Errno::EFOO;
}
=head1 AUTHOR
Graham Barr <gbarr@pobox.com>
=head1 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.
=cut
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