use ExtUtils::MakeMaker;
use Config;
use strict;
our $VERSION = "1.18";
my %err = ();
my %wsa = ();
# Symbian cross-compiling environment.
my $IsSymbian = exists $ENV{SDK} && -d "$ENV{SDK}\\epoc32";
my $IsMSWin32 = $^O eq 'MSWin32' && !$IsSymbian;
unlink "Errno.pm" if -f "Errno.pm";
unlink "Errno.tmp" if -f "Errno.tmp";
open OUT, ">Errno.tmp" or die "Cannot open Errno.tmp: $!";
select OUT;
my $file;
my @files = get_files();
if ($Config{gccversion} ne '' && $^O eq 'MSWin32') {
# MinGW complains "warning: #pragma system_header ignored outside include
# file" if the header files are processed individually, so include them
# all in .c file and process that instead.
open INCS, '>includes.c' or
die "Cannot open includes.c";
foreach $file (@files) {
next if $file eq 'errno.c';
next unless -f $file;
print INCS qq[#include "$file"\n];
}
close INCS;
process_file('includes.c');
unlink 'includes.c';
}
else {
foreach $file (@files) {
process_file($file);
}
}
write_errno_pm();
unlink "errno.c" if -f "errno.c";
close OUT or die "Error closing Errno.tmp: $!";
select STDOUT;
rename "Errno.tmp", "Errno.pm" or die "Cannot rename Errno.tmp to Errno.pm: $!";
sub process_file {
my($file) = @_;
# for win32 perl under cygwin, we need to get a windows pathname
if ($^O eq 'MSWin32' && $Config{cc} =~ /\B-mno-cygwin\b/ &&
defined($file) && !-f $file) {
chomp($file = `cygpath -w "$file"`);
}
return unless defined $file and -f $file;
# warn "Processing $file\n";
local *FH;
if (($^O eq 'VMS') && ($Config{vms_cc_type} ne 'gnuc')) {
unless(open(FH," LIBRARY/EXTRACT=ERRNO/OUTPUT=SYS\$OUTPUT $file |")) {
warn "Cannot open '$file'";
return;
}
} elsif ($Config{gccversion} ne ''
# OpenSTEP has gcc 2.7.2.1 which recognizes but
# doesn't implement the -dM flag.
&& $^O ne 'openstep' && $^O ne 'next' && $^O ne 'darwin'
) {
# With the -dM option, gcc outputs every #define it finds
unless(open(FH,"$Config{cc} -E -dM $Config{cppflags} $file |")) {
warn "Cannot open '$file'";
return;
}
} else {
unless(open(FH,"< $file")) {
# This file could be a temporary file created by cppstdin
# so only warn under -w, and return
warn "Cannot open '$file'" if $^W;
return;
}
}
while(<FH>) {
$err{$1} = 1
if /^\s*#\s*define\s+(E\w+)\s+/;
if ($IsMSWin32) {
$wsa{$1} = 1
if /^\s*#\s*define\s+WSA(E\w+)\s+/;
}
}
close(FH);
}
my $cppstdin;
sub default_cpp {
unless (defined $cppstdin) {
use File::Spec;
$cppstdin = $Config{cppstdin};
my $upup_cppstdin = File::Spec->catfile(File::Spec->updir,
File::Spec->updir,
"cppstdin");
my $cppstdin_is_wrapper =
($cppstdin eq 'cppstdin'
and -f $upup_cppstdin
and -x $upup_cppstdin);
$cppstdin = $upup_cppstdin if $cppstdin_is_wrapper;
}
return "$cppstdin $Config{cppflags} $Config{cppminus}";
}
sub get_files {
my %file = ();
# VMS keeps its include files in system libraries (well, except for Gcc)
if ($^O eq 'VMS') {
if ($Config{vms_cc_type} eq 'decc') {
$file{'Sys$Library:DECC$RTLDEF.TLB'} = 1;
} elsif ($Config{vms_cc_type} eq 'vaxc') {
$file{'Sys$Library:vaxcdef.tlb'} = 1;
} elsif ($Config{vms_cc_type} eq 'gcc') {
$file{'gnu_cc_include:[000000]errno.h'} = 1;
}
} elsif ($^O eq 'os390') {
# OS/390 C compiler doesn't generate #file or #line directives
$file{'/usr/include/errno.h'} = 1;
} elsif ($Config{archname} eq 'arm-riscos') {
# Watch out for cross compiling for RISC OS
my $dep = `echo "#include <errno.h>" | gcc -E -M -`;
if ($dep =~ /(\S+errno\.h)/) {
$file{$1} = 1;
}
} elsif ($^O eq 'linux' &&
$Config{gccversion} ne '' &&
$Config{gccversion} !~ /intel/i
# might be using, say, Intel's icc
) {
# Some Linuxes have weird errno.hs which generate
# no #file or #line directives
my $linux_errno_h = -e '/usr/include/errno.h' ?
'/usr/include/errno.h' : '/usr/local/include/errno.h';
$file{$linux_errno_h} = 1;
} elsif ($^O eq 'haiku') {
# hidden in a special place
$file{'/boot/develop/headers/posix/errno.h'} = 1;
} elsif ($^O eq 'vos') {
# avoid problem where cpp returns non-POSIX pathnames
$file{'/system/include_library/errno.h'} = 1;
} elsif ($IsSymbian) {
my $SDK = $ENV{SDK};
$SDK =~ s!\\!/!g;
$file{"$SDK/epoc32/include/libc/sys/errno.h"} = 1;
} else {
open(CPPI,"> errno.c") or
die "Cannot open errno.c";
if ($^O eq 'NetWare') {
print CPPI "#include <nwerrno.h>\n";
} else {
print CPPI "#include <errno.h>\n";
if ($IsMSWin32) {
print CPPI "#define _WINSOCKAPI_\n"; # don't drag in everything
print CPPI "#include <winsock.h>\n";
}
}
close(CPPI);
# invoke CPP and read the output
if ($IsMSWin32 || $^O eq 'NetWare') {
open(CPPO,"$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";
}
my $pat = '^#\s*(?:line)?\s*\d+\s+"([^"]+)"';
while(<CPPO>) {
if ($^O eq 'os2' or $IsMSWin32 or $^O eq 'NetWare') {
if (/$pat/o) {
my $f = $1;
$f =~ s,\\\\,/,g;
$file{$f} = 1;
}
}
else {
$file{$1} = 1 if /$pat/o;
}
}
close(CPPO);
}
return keys %file;
}
sub write_errno_pm {
my $err;
# quick sanity check
die "No error definitions found" unless keys %err;
# create the CPP input
open(CPPI,"> errno.c") or
die "Cannot open errno.c";
if ($^O eq 'NetWare') {
print CPPI "#include <nwerrno.h>\n";
}
else {
print CPPI "#include <errno.h>\n";
}
if ($IsMSWin32) {
print CPPI "#include <winsock.h>\n";
foreach $err (keys %wsa) {
print CPPI "#if defined($err) && $err >= 100\n";
print CPPI "#undef $err\n";
print CPPI "#endif\n";
print CPPI "#ifndef $err\n";
print CPPI "#define $err WSA$err\n";
print CPPI "#endif\n";
$err{$err} = 1;
}
}
foreach $err (keys %err) {
print CPPI '"',$err,'" [[',$err,']]',"\n";
}
close(CPPI);
{ # BeOS (support now removed) did not enter this block
# invoke CPP and read the output
if ($^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 $Config{cppstdin}";
} elsif ($IsMSWin32 || $^O eq 'NetWare') {
open(CPPO,"$Config{cpprun} $Config{cppflags} errno.c |") or
die "Cannot run '$Config{cpprun} $Config{cppflags} errno.c'";
} elsif ($IsSymbian) {
my $cpp = "gcc -E -I$ENV{SDK}\\epoc32\\include\\libc -";
open(CPPO,"$cpp < errno.c |")
or die "Cannot exec $cpp";
} else {
my $cpp = default_cpp();
open(CPPO,"$cpp < errno.c |")
or die "Cannot exec $cpp";
}
%err = ();
while(<CPPO>) {
my($name,$expr);
next unless ($name, $expr) = /"(.*?)"\s*\[\s*\[\s*(.*?)\s*\]\s*\]/;
next if $name eq $expr;
$expr =~ s/\(?\([a-z_]\w*\)([^\)]*)\)?/$1/i; # ((type)0xcafebabe) at alia
$expr =~ s/((?:0x)?[0-9a-fA-F]+)[LU]+\b/$1/g; # 2147483647L et alia
next if $expr =~ m/^[a-zA-Z]+$/; # skip some Win32 functions
if($expr =~ m/^0[xX]/) {
$err{$name} = hex $expr;
}
else {
$err{$name} = eval $expr;
}
delete $err{$name} unless defined $err{$name};
}
close(CPPO);
}
# escape $Config{'archname'}
my $archname = $Config{'archname'};
$archname =~ s/([@%\$])/\\\1/g;
# Write Errno.pm
print <<"EDQ";
# -*- buffer-read-only: t -*-
#
# This file is auto-generated. ***ANY*** changes here will be lost
#
package Errno;
require Exporter;
use Config;
use strict;
"\$Config{'archname'}-\$Config{'osvers'}" eq
"$archname-$Config{'osvers'}" or
die "Errno architecture ($archname-$Config{'osvers'}) does not match executable architecture (\$Config{'archname'}-\$Config{'osvers'})";
our \$VERSION = "$VERSION";
\$VERSION = eval \$VERSION;
our \@ISA = 'Exporter';
my %err;
BEGIN {
%err = (
EDQ
my @err = sort { $err{$a} <=> $err{$b} }
grep { $err{$_} =~ /-?\d+$/ } keys %err;
foreach $err (@err) {
print "\t$err => $err{$err},\n";
}
print <<'ESQ';
);
# Generate proxy constant subroutines for all the values.
# Well, almost all the values. Unfortunately we can't assume that at this
# point that our symbol table is empty, as code such as if the parser has
# seen code such as C<exists &Errno::EINVAL>, it will have created the
# typeglob.
# Doing this before defining @EXPORT_OK etc means that even if a platform is
# crazy enough to define EXPORT_OK as an error constant, everything will
# still work, because the parser will upgrade the PCS to a real typeglob.
# We rely on the subroutine definitions below to update the internal caches.
# Don't use %each, as we don't want a copy of the value.
foreach my $name (keys %err) {
if ($Errno::{$name}) {
# We expect this to be reached fairly rarely, so take an approach
# which uses the least compile time effort in the common case:
eval "sub $name() { $err{$name} }; 1" or die $@;
} else {
$Errno::{$name} = \$err{$name};
}
}
}
our @EXPORT_OK = keys %err;
our %EXPORT_TAGS = (
POSIX => [qw(
ESQ
my $k = join(" ", grep { exists $err{$_} }
qw(E2BIG EACCES EADDRINUSE EADDRNOTAVAIL EAFNOSUPPORT
EAGAIN EALREADY EBADF EBUSY ECHILD ECONNABORTED
ECONNREFUSED ECONNRESET EDEADLK EDESTADDRREQ EDOM EDQUOT
EEXIST EFAULT EFBIG EHOSTDOWN EHOSTUNREACH EINPROGRESS
EINTR EINVAL EIO EISCONN EISDIR ELOOP EMFILE EMLINK
EMSGSIZE ENAMETOOLONG ENETDOWN ENETRESET ENETUNREACH
ENFILE ENOBUFS ENODEV ENOENT ENOEXEC ENOLCK ENOMEM
ENOPROTOOPT ENOSPC ENOSYS ENOTBLK ENOTCONN ENOTDIR
ENOTEMPTY ENOTSOCK ENOTTY ENXIO EOPNOTSUPP EPERM
EPFNOSUPPORT EPIPE EPROCLIM EPROTONOSUPPORT EPROTOTYPE
ERANGE EREMOTE ERESTART EROFS ESHUTDOWN ESOCKTNOSUPPORT
ESPIPE ESRCH ESTALE ETIMEDOUT ETOOMANYREFS ETXTBSY
EUSERS EWOULDBLOCK EXDEV));
$k =~ s/(.{50,70})\s/$1\n\t/g;
print "\t",$k,"\n )]\n);\n\n";
print <<'ESQ';
sub TIEHASH { bless \%err }
sub FETCH {
my (undef, $errname) = @_;
return "" unless exists $err{$errname};
my $errno = $err{$errname};
return $errno == $! ? $errno : 0;
}
sub STORE {
require Carp;
Carp::confess("ERRNO hash is read only!");
}
*CLEAR = *DELETE = \*STORE; # Typeglob aliasing uses less space
sub NEXTKEY {
each %err;
}
sub FIRSTKEY {
my $s = scalar keys %err; # initialize iterator
each %err;
}
sub EXISTS {
my (undef, $errname) = @_;
exists $err{$errname};
}
tie %!, __PACKAGE__; # Returns an object, objects are true.
__END__
=head1 NAME
Errno - System errno constants
=head1 SYNOPSIS
use Errno qw(EINTR EIO :POSIX);
=head1 DESCRIPTION
C<Errno> defines and conditionally exports all the error constants
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<$!> is set to that value. For example:
use Errno;
unless (open(FH, "/fangorn/spouse")) {
if ($!{ENOENT}) {
warn "Get a wife!\n";
} else {
warn "This path is barred: $!";
}
}
If a specified constant C<EFOO> does not exist on the system, C<$!{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>
=head1 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.
=cut
# ex: set ro:
ESQ
}