use Config;
use strict;
-use vars qw($VERSION);
-
-$VERSION = "1.111";
+our $VERSION = "1.111";
my %err = ();
sub process_file {
my($file) = @_;
- return unless defined $file;
+ return unless defined $file and -f $file;
local *FH;
if (($^O eq 'VMS') && ($Config{vms_cc_type} ne 'gnuc')) {
warn "Cannot open '$file'";
return;
}
+ } elsif ($Config{gccversion} ne '') {
+ # With the -dM option, gcc outputs every #define it finds
+ unless(open(FH,"$Config{cc} -E -dM $Config{cppflags} $file |")) {
+ warn "Cannot open '$file'";
+ return;
+ }
} else {
unless(open(FH,"< $file")) {
# This file could be a temporary file created by cppstdin
return;
}
}
- while(<FH>) {
- $err{$1} = 1
- if /^\s*#\s*define\s+(E\w+)\s+/;
- }
- close(FH);
+
+ if ($^O eq 'MacOS') {
+ while(<FH>) {
+ $err{$1} = $2
+ if /^\s*#\s*define\s+(E\w+)\s+(\d+)/;
+ }
+ } else {
+ while(<FH>) {
+ $err{$1} = 1
+ if /^\s*#\s*define\s+(E\w+)\s+/;
+ }
+ }
+ close(FH);
}
my $cppstdin;
} elsif ($^O eq 'vmesa') {
# OS/390 C compiler doesn't generate #file or #line directives
$file{'../../vmesa/errno.h'} = 1;
+ } elsif ($Config{archname} eq 'epoc') {
+ # Watch out for cross compiling for EPOC (usually done on linux)
+ $file{'/usr/local/epoc/include/libc/sys/errno.h'} = 1;
+ } elsif ($^O eq 'linux') {
+ # Some Linuxes have weird errno.hs which generate
+ # no #file or #line directives
+ $file{'/usr/include/errno.h'} = 1;
+ } elsif ($^O eq 'MacOS') {
+ # note that we are only getting the GUSI errno's here ...
+ # we might miss out on compiler-specific ones
+ $file{"$ENV{GUSI}include:sys:errno.h"} = 1;
+
} else {
open(CPPI,"> errno.c") or
die "Cannot open errno.c";
$pat = '^/\*\s+(.+)\s+\d+\s*:\s+\*/';
}
else {
- $pat = '^#(?:line)?\s*\d+\s+"([^"]+)"';
+ $pat = '^#\s*(?:line)?\s*\d+\s+"([^"]+)"';
}
while(<CPPO>) {
- if ($^O eq 'os2') {
+ if ($^O eq 'os2' or $^O eq 'MSWin32') {
if (/$pat/o) {
my $f = $1;
$f =~ s,\\\\,/,g;
close(CPPI);
+ unless ($^O eq 'MacOS') { # trust what we have
# invoke CPP and read the output
- if ($^O eq 'VMS') {
- my $cpp = "$Config{cppstdin} $Config{cppflags} $Config{cppminus}";
- $cpp =~ s/sys\$input//i;
- open(CPPO,"$cpp errno.c |") or
- die "Cannot exec $Config{cppstdin}";
- } elsif ($^O eq 'MSWin32') {
- open(CPPO,"$Config{cpprun} $Config{cppflags} errno.c |") or
- die "Cannot run '$Config{cpprun} $Config{cppflags} errno.c'";
- } else {
- my $cpp = default_cpp();
- open(CPPO,"$cpp < errno.c |")
- or die "Cannot exec $cpp";
- }
+ if ($^O eq 'VMS') {
+ my $cpp = "$Config{cppstdin} $Config{cppflags} $Config{cppminus}";
+ $cpp =~ s/sys\$input//i;
+ open(CPPO,"$cpp errno.c |") or
+ die "Cannot exec $Config{cppstdin}";
+ } elsif ($^O eq 'MSWin32') {
+ open(CPPO,"$Config{cpprun} $Config{cppflags} errno.c |") or
+ die "Cannot run '$Config{cpprun} $Config{cppflags} errno.c'";
+ } else {
+ my $cpp = default_cpp();
+ open(CPPO,"$cpp < errno.c |")
+ or die "Cannot exec $cpp";
+ }
- %err = ();
+ %err = ();
- while(<CPPO>) {
- my($name,$expr);
- next unless ($name, $expr) = /"(.*?)"\s*\[\s*\[\s*(.*?)\s*\]\s*\]/;
- next if $name eq $expr;
- $err{$name} = eval $expr;
+ while(<CPPO>) {
+ my($name,$expr);
+ next unless ($name, $expr) = /"(.*?)"\s*\[\s*\[\s*(.*?)\s*\]\s*\]/;
+ next if $name eq $expr;
+ $err{$name} = eval $expr;
+ }
+ close(CPPO);
}
- close(CPPO);
# Write Errno.pm
#
package Errno;
-use vars qw(\@EXPORT_OK \%EXPORT_TAGS \@ISA \$VERSION \%errno \$AUTOLOAD);
+our (\@EXPORT_OK,\%EXPORT_TAGS,\@ISA,\$VERSION,\%errno,\$AUTOLOAD);
use Exporter ();
use Config;
use strict;
-\$Config{'myarchname'} eq "$Config{'myarchname'}" or
- die "Errno architecture ($Config{'myarchname'}) does not match executable architecture (\$Config{'myarchname'})";
+"\$Config{'archname'}-\$Config{'osvers'}" eq
+"$Config{'archname'}-$Config{'osvers'}" or
+ die "Errno architecture ($Config{'archname'}-$Config{'osvers'}) does not match executable architecture (\$Config{'archname'}-\$Config{'osvers'})";
\$VERSION = "$VERSION";
\@ISA = qw(Exporter);
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>