NAME
Errno - System errno constants
SYNOPSIS
1 | 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 $! is set to that value. For example:
1 2 3 4 5 6 7 8 9 | use Errno;unless (open(FH, "/fangorn/spouse")) { if ($!{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:
1 2 3 | 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.
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