use ExtUtils::MakeMaker; use Config; use strict; use vars qw($VERSION); $VERSION = "1.111"; my %err = (); 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 $file; local *FH; if (($^O eq 'VMS') && ($Config{vms_cc_type} ne 'gnuc')) { unless(open(FH," LIBRARY/EXTRACT=ERRNO/OUTPUT=SYS\$OUTPUT $file |")) { warn "Cannot open '$file'"; return; } } else { unless(open(FH,"< $file")) { # This file could be a temporay file created by cppstdin # so only warn under -w, and return warn "Cannot open '$file'" if $^W; return; } } while() { $err{$1} = 1 if /^\s*#\s*define\s+(E\w+)\s+/; } close(FH); } sub get_files { my %file = (); # VMS keeps its include files in system libraries (well, except for Gcc) if ($^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 $file{'../../vmesa/errno.h'} = 1; } else { open(CPPI,"> errno.c") or die "Cannot open errno.c"; print CPPI "#include \n"; close(CPPI); # invoke CPP and read the output if ($^O eq 'MSWin32') { open(CPPO,"$Config{cpprun} $Config{cppflags} errno.c |") or die "Cannot run '$Config{cpprun} $Config{cppflags} errno.c'"; } else { my $cpp = "$Config{cppstdin} $Config{cppflags} $Config{cppminus}"; open(CPPO,"$cpp < errno.c |") or die "Cannot exec $cpp"; } my $pat; if ($^O eq 'MSWin32' and $Config{cc} =~ /^bcc/i) { $pat = '^/\*\s+(.+)\s+\d+\s*:\s+\*/'; } else { $pat = '^#(?:line)?\s*\d+\s+"([^"]+)"'; } while() { $file{$1} = 1 if /$pat/o; } close(CPPO); } return keys %file; } sub write_errno_pm { my $err; # create the CPP input open(CPPI,"> errno.c") or die "Cannot open errno.c"; print CPPI "#include \n"; foreach $err (keys %err) { print CPPI '"',$err,'" [[',$err,']]',"\n"; } close(CPPI); # invoke CPP and read the output if ($^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 $cpp = "$Config{cppstdin} $Config{cppflags} $Config{cppminus}"; open(CPPO,"$cpp < errno.c |") or die "Cannot exec $cpp"; } %err = (); while() { my($name,$expr); next unless ($name, $expr) = /"(.*?)"\s*\[\s*\[\s*(.*?)\s*\]\s*\]/; next if $name eq $expr; $err{$name} = eval $expr; } close(CPPO); # Write Errno.pm print <<"EDQ"; # # This file is auto-generated. ***ANY*** changes here will be lost # package Errno; use vars qw(\@EXPORT_OK \%EXPORT_TAGS \@ISA \$VERSION \%errno \$AUTOLOAD); use Exporter (); use Config; use strict; \$Config{'myarchname'} eq "$Config{'myarchname'}" or die "Errno architecture ($Config{'myarchname'}) does not match executable architecture (\$Config{'myarchname'})"; \$VERSION = "$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"); if (defined($proto) && $proto eq "") { no strict 'refs'; return $! == &$errname; } require Carp; Carp::confess("No errno $errname"); } sub STORE { require Carp; Carp::confess("ERRNO hash is read only!"); } *CLEAR = \&STORE; *DELETE = \&STORE; sub NEXTKEY { my($k,$v); while(($k,$v) = each %Errno::) { my $proto = prototype("Errno::$k"); last if (defined($proto) && $proto eq ""); } $k } sub FIRSTKEY { my $s = scalar keys %Errno::; goto &NEXTKEY; } sub EXISTS { my ($self, $errname) = @_; my $proto = prototype($errname); defined($proto) && $proto eq ""; } tie %!, __PACKAGE__; 1; __END__ =head1 NAME Errno - System errno constants =head1 SYNOPSIS use Errno qw(EINTR EIO :POSIX); =head1 DESCRIPTION C defines and conditionally exports all the error constants defined in your system C include file. It has a single export tag, C<:POSIX>, which will export all POSIX defined error numbers. C also makes C<%!> magic such that each element of C<%!> has a non-zero value only if C<$!> is set to that value, eg use Errno; unless (open(FH, "/fangorn/spouse")) { if ($!{ENOENT}) { warn "Get a wife!\n"; } else { warn "This path is barred: $!"; } } =head1 AUTHOR Graham Barr =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 }