http://qs321.pair.com?node_id=1108

lib:Errno

See the current Perl documentation for lib:Errno.

Here is our local, out-dated (pre-5.6) version:

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 non-zero value only if $! is set to that value, eg

    use Errno;
    
    unless (open(FH, "/fangorn/spouse")) {
        if ($!{ENOENT}) {
            warn "Get a wife!\n";
        } else {
            warn "This path is barred: $!";
        } 
    } 

---

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.

---