1 files changed, 121 insertions, 0 deletions
diff --git a/contrib/perl5/lib/Sys/Hostname.pm b/contrib/perl5/lib/Sys/Hostname.pm
new file mode 100644
index 000000000000..95f9a99a7abf
--- /dev/null
+++ b/contrib/perl5/lib/Sys/Hostname.pm
@@ -0,0 +1,121 @@
+package Sys::Hostname;
+
+use Carp;
+require Exporter;
+@ISA = qw(Exporter);
+@EXPORT = qw(hostname);
+
+=head1 NAME
+
+Sys::Hostname - Try every conceivable way to get hostname
+
+=head1 SYNOPSIS
+
+    use Sys::Hostname;
+    $host = hostname;
+
+=head1 DESCRIPTION
+
+Attempts several methods of getting the system hostname and
+then caches the result.  It tries C<syscall(SYS_gethostname)>,
+C<`hostname`>, C<`uname -n`>, and the file F</com/host>.
+If all that fails it C<croak>s.
+
+All nulls, returns, and newlines are removed from the result.
+
+=head1 AUTHOR
+
+David Sundstrom E<lt>F<sunds@asictest.sc.ti.com>E<gt>
+
+Texas Instruments
+
+=cut
+
+sub hostname {
+
+  # method 1 - we already know it
+  return $host if defined $host;
+
+  if ($^O eq 'VMS') {
+
+    # method 2 - no sockets ==> return DECnet node name
+    eval { local $SIG{__DIE__}; $host = (gethostbyname('me'))[0] };
+    if ($@) { return $host = $ENV{'SYS$NODE'}; }
+
+    # method 3 - has someone else done the job already?  It's common for the
+    #    TCP/IP stack to advertise the hostname via a logical name.  (Are
+    #    there any other logicals which TCP/IP stacks use for the host name?)
+    $host = $ENV{'ARPANET_HOST_NAME'}  || $ENV{'INTERNET_HOST_NAME'} ||
+            $ENV{'MULTINET_HOST_NAME'} || $ENV{'UCX$INET_HOST'}      ||
+            $ENV{'TCPWARE_DOMAINNAME'} || $ENV{'NEWS_ADDRESS'};
+    return $host if $host;
+
+    # method 4 - does hostname happen to work?
+    my($rslt) = `hostname`;
+    if ($rslt !~ /IVVERB/) { ($host) = $rslt =~ /^(\S+)/; }
+    return $host if $host;
+
+    # rats!
+    $host = '';
+    Carp::croak "Cannot get host name of local machine";  
+
+  }
+  elsif ($^O eq 'MSWin32') {
+    ($host) = gethostbyname('localhost');
+    chomp($host = `hostname 2> NUL`) unless defined $host;
+    return $host;
+  }
+  else {  # Unix
+
+    # method 2 - syscall is preferred since it avoids tainting problems
+    eval {
+	local $SIG{__DIE__};
+	{
+	    package main;
+	    require "syscall.ph";
+	}
+	$host = "\0" x 65; ## preload scalar
+	syscall(&main::SYS_gethostname, $host, 65) == 0;
+    }
+
+    # method 2a - syscall using systeminfo instead of gethostname
+    #           -- needed on systems like Solaris
+    || eval {
+	local $SIG{__DIE__};
+	{
+	    package main;
+	    require "sys/syscall.ph";
+	    require "sys/systeminfo.ph";
+	}
+	$host = "\0" x 65; ## preload scalar
+	syscall(&main::SYS_systeminfo, &main::SI_HOSTNAME, $host, 65) != -1;
+    }
+
+    # method 3 - trusty old hostname command
+    || eval {
+	local $SIG{__DIE__};
+	$host = `(hostname) 2>/dev/null`; # bsdish
+    }
+
+    # method 4 - sysV uname command (may truncate)
+    || eval {
+	local $SIG{__DIE__};
+	$host = `uname -n 2>/dev/null`; ## sysVish
+    }
+
+    # method 5 - Apollo pre-SR10
+    || eval {
+	local $SIG{__DIE__};
+	($host,$a,$b,$c,$d)=split(/[:\. ]/,`/com/host`,6);
+    }
+
+    # bummer
+    || Carp::croak "Cannot get host name of local machine";  
+
+    # remove garbage 
+    $host =~ tr/\0\r\n//d;
+    $host;
+  }
+}
+
+1;