Errno_pm.PL revision 7c478bd95313f5f23a4c958a745db2134aa03244
use ExtUtils::MakeMaker;
use Config;
use strict;
our $VERSION = "1.09_00";
my %err = ();
my %wsa = ();
unlink "Errno.pm" if -f "Errno.pm";
open OUT, ">Errno.pm" or die "Cannot open Errno.pm: $!";
select OUT;
my $file;
foreach $file (get_files()) {
process_file($file);
}
write_errno_pm();
unlink "errno.c" if -f "errno.c";
sub process_file {
my($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 $^W;
return;
}
}
if ($^O eq 'MacOS') {
while(<FH>) {
$err{$1} = $2
if /^\s*#\s*define\s+(E\w+)\s+(\d+)/;
}
} else {
while(<FH>) {
$err{$1} = 1
if /^\s*#\s*define\s+(E\w+)\s+/;
if ($^O eq 'MSWin32') {
$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
$file{'/usr/include/errno.h'} = 1;
} elsif ($^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)
$file{'/usr/local/epocemx/epocsdk/include/libc/sys/errno.h'} = 1;
} elsif ($^O eq 'linux' &&
$Config{gccversion} ne '' # 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 '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;
} elsif ($^O eq 'beos') {
# 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
$file{'/system/include_library/errno.h'} = 1;
} else {
open(CPPI,"> errno.c") or
die "Cannot open errno.c";
if ($^O eq 'NetWare') {
print CPPI "#include <nwerrno.h>\n";
} else {
print CPPI "#include <errno.h>\n";
if ($^O eq 'MSWin32') {
print CPPI "#define _WINSOCKAPI_\n"; # don't drag in everything
print CPPI "#include <winsock.h>\n";
}
}
close(CPPI);
# invoke CPP and read the output
if ($^O eq 'MSWin32' || $^O eq 'NetWare') {
open(CPPO,"$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 $pat;
if (($^O eq 'MSWin32' || $^O eq 'NetWare') and $Config{cc} =~ /^bcc/i) {
$pat = '^/\*\s+(.+)\s+\d+\s*:\s+\*/';
}
else {
$pat = '^#\s*(?:line)?\s*\d+\s+"([^"]+)"';
}
while(<CPPO>) {
if ($^O eq 'os2' or $^O eq 'MSWin32' 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 ($^O eq 'MSWin32') {
print CPPI "#include <winsock.h>\n";
foreach $err (keys %wsa) {
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,'" [[',$err,']]',"\n";
}
close(CPPI);
unless ($^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' || $^O eq 'NetWare') {
open(CPPO,"$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 $cpp";
}
%err = ();
while(<CPPO>) {
my($name,$expr);
next unless ($name, $expr) = /"(.*?)"\s*\[\s*\[\s*(.*?)\s*\]\s*\]/;
next if $name eq $expr;
$expr =~ s/\(?\(\w+\)([^\)]*)\)?/$1/; # ((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);
}
# Many of the E constants (including ENOENT, which is being
# used in the Perl test suite a lot), are available only as
# enums in BeOS, so compiling and executing some code is about
# only way to find out what the numeric Evalues are.
if ($^O eq 'beos') {
if (open(C, ">errno.c")) {
my @zero = grep { !$err{$_} } keys %err;
print C <<EOF;
#include <errno.h>
#include <stdio.h>
int main() {
EOF
for (@zero) {
print C qq[printf("$_ %d\n", $_);]
}
print C "}\n";
close C;
system("cc -o errno errno.c");
unlink("errno.c");
if (open(C, "./errno|")) {
while (<C>) {
if (/^(\w+) (-?\d+)$/) { $err{$1} = $2 }
}
close(C);
} else {
die "failed to execute ./errno: $!\n";
}
unlink("errno");
} else {
die "failed to create errno.c: $!\n";
}
}
# Write Errno.pm
print <<"EDQ";
#
# This file is auto-generated. ***ANY*** changes here will be lost
#
package Errno;
our (\@EXPORT_OK,\%EXPORT_TAGS,\@ISA,\$VERSION,\%errno,\$AUTOLOAD);
use Exporter ();
use Config;
use strict;
"\$Config{'archname'}-\$Config{'osvers'}" eq
"$Config{'archname'}-$Config{'osvers'}" or
die "Errno architecture ($Config{'archname'}-$Config{'osvers'}) does not match executable architecture (\$Config{'archname'}-\$Config{'osvers'})";
\$VERSION = "$VERSION";
\$VERSION = eval \$VERSION;
\@ISA = qw(Exporter);
EDQ
my $len = 0;
my @err = sort { $err{$a} <=> $err{$b} } keys %err;
map { $len = length if length > $len } @err;
my $j = "\@EXPORT_OK = qw(" . join(" ",keys %err) . ");\n";
$j =~ s/(.{50,70})\s/$1\n\t/g;
print $j,"\n";
print <<'ESQ';
%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";
foreach $err (@err) {
printf "sub %s () { %d }\n",,$err,$err{$err};
}
print <<'ESQ';
sub TIEHASH { bless [] }
sub FETCH {
my ($self, $errname) = @_;
my $proto = prototype("Errno::$errname");
my $errno = "";
if (defined($proto) && $proto eq "") {
no strict 'refs';
$errno = &$errname;
$errno = 0 unless $! == $errno;
}
return $errno;
}
sub STORE {
require Carp;
Carp::confess("ERRNO hash is read only!");
}
*CLEAR = \&STORE;
*DELETE = \&STORE;
sub NEXTKEY {
my($k,$v);
while(($k,$v) = each %Errno::) {
my $proto = prototype("Errno::$k");
last if (defined($proto) && $proto eq "");
}
$k
}
sub FIRSTKEY {
my $s = scalar keys %Errno::; # initialize iterator
goto &NEXTKEY;
}
sub EXISTS {
my ($self, $errname) = @_;
my $proto = prototype($errname);
defined($proto) && $proto eq "";
}
tie %!, __PACKAGE__;
1;
__END__
=head1 NAME
Errno - System errno constants
=head1 SYNOPSIS
use Errno qw(EINTR EIO :POSIX);
=head1 DESCRIPTION
C<Errno> defines and conditionally exports all the error constants
defined in your system C<errno.h> include file. It has a single export
tag, C<:POSIX>, which will export all POSIX defined error numbers.
C<Errno> also makes C<%!> magic such that each element of C<%!> has a
non-zero value only if C<$!> 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
ESQ
}