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###############################################################
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# setarchitecture #
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###############################################################
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# modified : Fri Jul 12 13:55:16 2002 / SFA #
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# params : none #
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# : #
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# : #
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# : #
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# function : Set the architecture variable. Use simple uname #
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# : query for Sun: for Linux, alos try libc checking.#
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# : #
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# : #
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###############################################################
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package setarchitecture;
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require 5.001;
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require Exporter;
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@ISA = qw(Exporter);
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@EXPORT = qw(setarch);
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# Currently, this is only used for UNIX systems. Not entirely sure what
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# happens on Windows (most people tend to use CYGWIN). Eventually, this
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# will need to be improved for non-UNIX architectures:
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sub setarch
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{
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my $uname=`uname -a`;
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my ($OSname, $hostname, $OSversion, @rest) = split / /, $uname;
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my $lddcmd="ldd /bin/ls";
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# Retain only the first two version digits
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# of os version from uname:
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if ( $OSname =~ SunOS )
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{
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$OSversion =~ s/^(.\..)\..*/\1/;
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}
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# Linux:
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elsif ( $OSname =~ Linux )
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{
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# Firstly we check for the kernel version.
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$OSversion =~ s/^(.\..)\..*/\1/;
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# Now, we also check for the libc version to confirm (or otherwise)
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# the choice determined by the previous step:
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# Open the ldd command as a pipe:
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my $pid = open(LDD,"$lddcmd 2>&1 |");
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# Check that we were able to fork:
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if (defined($pid))
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{
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# Loop over lines of output:
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while (<LDD>)
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{
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chomp $_;
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# Grab something that looks like "libc.*":
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if (my ($libc) = ($_ =~ /\s+libc\.so.*\s.*\s(.*)\s.*/))
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{
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# Check if this libc thing is a soft link (it should be), then
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# find out what the thingy is that the link points to:
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if ( -l $libc && defined($value = readlink $libc))
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{
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# Extract the useful numeric info from this:
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my ($libcmaj,$libcmin,$libcpatch) = ($value =~ /^libc-([0-9])\.([0-9])\.([0-9])\.so/);
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# Set the arch accordingly:
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if ($libcmaj == 2 && $libcmin == 1 && $libcpatch >= 3)
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{
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$ENV{SCRAM_ARCH}="Linux__2.2";
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}
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if ($libcmaj == 2 && $libcmin == 2 && $libcpatch >= 4)
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{
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$ENV{SCRAM_ARCH}="Linux__2.4";
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}
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}
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# No need to check other lines:
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last;
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}
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}
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}
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else
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# Fork failed, so we must fall back to
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# the normal mechanism to define the arch:
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{
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$ENV{SCRAM_ARCH}="${OSname}__${OSversion}";
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}
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}
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else
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{
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# At this point it looks like the platform is "other".
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# Set SCRAM_ARCH anyway to the default:
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$ENV{SCRAM_ARCH}="${OSname}__${OSversion}";
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}
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# Set arch flag to [OS type]__[OSversion] if not set by now:
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if ( ! defined $ENV{SCRAM_ARCH} )
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{
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$ENV{SCRAM_ARCH}="${OSname}__${OSversion}";
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}
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return (0);
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}
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