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# Copyright (c) 2008 - OpenSLX GmbH
#
# This program is free software distributed under the GPL version 2.
# See http://openslx.org/COPYING
#
# If you have any feedback please consult http://openslx.org/feedback and
# send your suggestions, praise, or complaints to feedback@openslx.org
#
# General information about OpenSLX can be found at http://openslx.org/
# -----------------------------------------------------------------------------
# PerlHeaders.pm
# - provides automatic generation of required perl headers (for syscalls)
# -----------------------------------------------------------------------------
package OpenSLX::Syscall;
use strict;
use warnings;
our $VERSION = 1.01;
=head1 NAME
OpenSLX::Syscall - provides wrapper functions for syscalls.
=head1 DESCRIPTION
This module exports one wrapper function for each syscall that OpenSLX is
using. Each of these functions takes care to load all required Perl-headers
before trying to invoke the respective syscall.
=cut
use Config;
use File::Path;
use OpenSLX::Basics;
=head1 PUBLIC FUNCTIONS
=over
=item B<enter32BitPersonality()>
Invokes the I<personality()> syscall in order to enter the 32-bit personality
(C<PER_LINUX32>).
=cut
sub enter32BitPersonality
{
_loadPerlHeader('syscall.ph');
_loadPerlHeader('linux/personality.ph', 'sys/personality.ph');
syscall(&SYS_personality, PER_LINUX32()) != -1
or warn _tr("unable to invoke syscall '%s'! ($!)", 'personality');
return;
}
sub _loadPerlHeader
{
my @phFiles = @_;
my @alreadyLoaded = grep { exists $INC{$_} } @phFiles;
return if @alreadyLoaded;
my $phLibDir = $Config{installsitearch};
local @INC = @INC;
push @INC, "$phLibDir/asm";
# Unability to load an existing Perl header may be caused by missing
# asm-(kernel-)headers, since for instance openSUSE 11 does not provide
# any of these).
# If they are missing, we just have a go at creating all of them:
mkpath($phLibDir) unless -e $phLibDir;
if (!-e "$phLibDir/asm") {
if (-l "/usr/include/asm") {
my $asmFolder = readlink("/usr/include/asm");
slxsystem("cd /usr/include && h2ph -rQ -d $phLibDir $asmFolder") == 0
or die _tr('unable to create Perl-header from "asm" folder! (%s)', $!);
slxsystem("mv $phLibDir/$asmFolder $phLibDir/asm") == 0
or die _tr('unable to cleanup "asm" folder for Perl headers! (%s)', $!);
}
elsif (-d "/usr/include/asm") {
slxsystem("cd /usr/include && h2ph -rQ -d $phLibDir asm") == 0
or die _tr('unable to create Perl-header from "asm" folder! (%s)', $!);
}
else {
die _tr(
'the folder "/usr/include/asm" is required - please install kernel headers!\
(maybe linux-libc-dev and/or libc6-dev-i386 missing)!'
);
}
}
if (-e "/usr/include/asm-generic" && !-e "$phLibDir/asm-generic") {
slxsystem("cd /usr/include && h2ph -rQ -d $phLibDir asm-generic") == 0
or die _tr('unable to create Perl-header from "asm-generic" folder! (%s)', $!);
}
for my $phFile (@phFiles) {
return 1 if eval { require $phFile };
warn(_tr(
'unable to load Perl-header "%s", trying to create it ...',
$phFile
));
# perl-header has not been provided by host-OS, so we create it
# manually from C-header (via h2ph):
(my $hFile = $phFile) =~ s{\.ph$}{.h};
if (-e "/usr/include/$hFile") {
slxsystem("cd /usr/include && h2ph -aQ -d $phLibDir $hFile") == 0
or die _tr('unable to create %s! (%s)', $phFile, $!);
}
return 1 if eval { require $phFile };
}
die _tr(
'unable to load any of these perl headers: %s (%s)',
join(',', @phFiles), $@
);
}
=back
=cut
1;
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