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Errno(3pm)			 Perl Programmers Reference Guide		       Errno(3pm)

NAME
       Errno - System errno constants

SYNOPSIS
	   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.

perl v5.16.3				    2014-06-17				       Errno(3pm)
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