sub process_file {
my($file) = @_;
- return unless defined $file;
+ return unless defined $file and -f $file;
local *FH;
if (($^O eq 'VMS') && ($Config{vms_cc_type} ne 'gnuc')) {
sub FETCH {
my ($self, $errname) = @_;
my $proto = prototype("Errno::$errname");
+ my $errno = "";
if (defined($proto) && $proto eq "") {
no strict 'refs';
- return $! == &$errname;
+ $errno = &$errname;
+ $errno = 0 unless $! == $errno;
}
- require Carp;
- Carp::confess("No errno $errname");
-}
+ return $errno;
+}
sub STORE {
require Carp;
while(($k,$v) = each %Errno::) {
my $proto = prototype("Errno::$k");
last if (defined($proto) && $proto eq "");
-
}
$k
}
sub FIRSTKEY {
- my $s = scalar keys %Errno::;
+ my $s = scalar keys %Errno::; # initialize iterator
goto &NEXTKEY;
}
defined in your system C<errno.h> include file. It has a single export
tag, C<:POSIX>, which will export all POSIX defined error numbers.
-C<Errno> also makes C<%!> magic such that each element of C<%!> has a non-zero
-value only if C<$!> is set to that value, eg
+C<Errno> also makes C<%!> magic such that each element of C<%!> has a
+non-zero value only if C<$!> is set to that value. For example:
use Errno;
-
+
unless (open(FH, "/fangorn/spouse")) {
if ($!{ENOENT}) {
warn "Get a wife!\n";
}
}
+If a specified constant C<EFOO> does not exist on the system, C<$!{EFOO}>
+returns C<"">. You may use C<exists $!{EFOO}> to check whether the
+constant is available on the system.
+
+=head1 CAVEATS
+
+Importing a particular constant may not be very portable, because the
+import will fail on platforms that do not have that constant. A more
+portable way to set C<$!> to a valid value is to use:
+
+ if (exists &Errno::EFOO) {
+ $! = &Errno::EFOO;
+ }
+
=head1 AUTHOR
Graham Barr <gbarr@pobox.com>