Errno - System errno constants


use Errno qw(EINTR EIO :POSIX);


"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 nonzero 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.


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;


Graham Barr <>


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.
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