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.\" ========================================================================
.\"
.IX Title "Errno 3"
.TH Errno 3 "2016-05-25" "perl v5.12.5" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Errno \- System errno constants
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use Errno qw(EINTR EIO :POSIX);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\f(CW\*(C`Errno\*(C'\fR defines and conditionally exports all the error constants
defined in your system \f(CW\*(C`errno.h\*(C'\fR include file. It has a single export
tag, \f(CW\*(C`:POSIX\*(C'\fR, which will export all \s-1POSIX\s0 defined error numbers.
.PP
\&\f(CW\*(C`Errno\*(C'\fR also makes \f(CW\*(C`%!\*(C'\fR magic such that each element of \f(CW\*(C`%!\*(C'\fR has a
non-zero value only if \f(CW$!\fR is set to that value. For example:
.PP
.Vb 1
\&    use Errno;
\&
\&    unless (open(FH, "/fangorn/spouse")) {
\&        if ($!{ENOENT}) {
\&            warn "Get a wife!\en";
\&        } else {
\&            warn "This path is barred: $!";
\&        } 
\&    }
.Ve
.PP
If a specified constant \f(CW\*(C`EFOO\*(C'\fR does not exist on the system, \f(CW$!{EFOO}\fR
returns \f(CW""\fR.  You may use \f(CW\*(C`exists $!{EFOO}\*(C'\fR to check whether the
constant is available on the system.
.SH "CAVEATS"
.IX Header "CAVEATS"
Importing a particular constant may not be very portable, because the
import will fail on platforms that do not have that constant.  A more
portable way to set \f(CW$!\fR to a valid value is to use:
.PP
.Vb 3
\&    if (exists &Errno::EFOO) {
\&        $! = &Errno::EFOO;
\&    }
.Ve
.SH "AUTHOR"
.IX Header "AUTHOR"
Graham Barr <gbarr@pobox.com>
.SH "COPYRIGHT"
.IX Header "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.


.\" Oracle has added the ARC stability level to this manual page
.SH ATTRIBUTES
See
.BR attributes (5)
for descriptions of the following attributes:
.sp
.TS
box;
cbp-1 | cbp-1
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE 
=
Availability	runtime/perl-512
=
Stability	Uncommitted
.TE 
.PP

.SH NOTES

.\" Oracle has added source availability information to this manual page
This software was built from source available at https://java.net/projects/solaris-userland.  The original community source was downloaded from  http://www.cpan.org/src/5.0/perl-5.12.5.tar.bz2

Further information about this software can be found on the open source community website at http://www.perl.org/.