dslinux/user/perl/ext/Sys/Hostname Hostname.pm Hostname.xs Makefile.PL

[cayenne]

Update of /cvsroot/dslinux/dslinux/user/perl/ext/Sys/Hostname
In directory antilope:/tmp/cvs-serv17422/ext/Sys/Hostname

Added Files:
	Hostname.pm Hostname.xs Makefile.PL 
Log Message:
Adding fresh perl source to HEAD to branch from

--- NEW FILE: Hostname.pm ---
package Sys::Hostname;

use strict;

use Carp;

require Exporter;
require AutoLoader;

our @ISA     = qw/ Exporter AutoLoader /;
our @EXPORT  = qw/ hostname /;

our $VERSION;

our $host;

BEGIN {
    $VERSION = '1.11';
    {
	local $SIG{__DIE__};
	eval {
	    require XSLoader;
	    XSLoader::load('Sys::Hostname', $VERSION);
	};
	warn $@ if $@;
    }
}


sub hostname {

  # method 1 - we already know it
  return $host if defined $host;

  # method 1' - try to ask the system
  $host = ghname() if defined &ghname;
  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 = '';
    croak "Cannot get host name of local machine";  

  }
  elsif ($^O eq 'MSWin32') {
    ($host) = gethostbyname('localhost');
    chomp($host = `hostname 2> NUL`) unless defined $host;
    return $host;
  }
  elsif ($^O eq 'epoc') {
    $host = 'localhost';
    return $host;
  }
  else {  # Unix
    # is anyone going to make it here?

    local $ENV{PATH} = '/usr/bin:/bin:/usr/sbin:/sbin'; # Paranoia.

    # method 2 - syscall is preferred since it avoids tainting problems
    # XXX: is it such a good idea to return hostname untainted?
    eval {
	local $SIG{__DIE__};
	require "syscall.ph";
	$host = "\0" x 65; ## preload scalar
	syscall(&SYS_gethostname, $host, 65) == 0;
    }

    # method 2a - syscall using systeminfo instead of gethostname
    #           -- needed on systems like Solaris
    || eval {
	local $SIG{__DIE__};
	require "sys/syscall.ph";
	require "sys/systeminfo.ph";
	$host = "\0" x 65; ## preload scalar
	syscall(&SYS_systeminfo, &SI_HOSTNAME, $host, 65) != -1;
    }

    # method 3 - trusty old hostname command
    || eval {
	local $SIG{__DIE__};
	local $SIG{CHLD};
	$host = `(hostname) 2>/dev/null`; # bsdish
    }

    # method 4 - use POSIX::uname(), which strictly can't be expected to be
    # correct
    || eval {
	local $SIG{__DIE__};
	require POSIX;
	$host = (POSIX::uname())[1];
    }

    # method 5 - sysV uname command (may truncate)
    || eval {
	local $SIG{__DIE__};
	$host = `uname -n 2>/dev/null`; ## sysVish
    }

    # method 6 - Apollo pre-SR10
    || eval {
	local $SIG{__DIE__};
        my($a,$b,$c,$d);
	($host,$a,$b,$c,$d)=split(/[:\. ]/,`/com/host`,6);
    }

    # bummer
    || croak "Cannot get host name of local machine";  

    # remove garbage 
    $host =~ tr/\0\r\n//d;
    $host;
  }
}

1;

__END__

=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 the first available of the C
library's gethostname(), C<`$Config{aphostname}`>, uname(2),
C<syscall(SYS_gethostname)>, C<`hostname`>, C<`uname -n`>,
and the file F</com/host>.  If all that fails it C<croak>s.

All NULs, returns, and newlines are removed from the result.

=head1 AUTHOR

David Sundstrom E<lt>F<sunds at asictest.sc.ti.com>E<gt>

Texas Instruments

XS code added by Greg Bacon E<lt>F<gbacon at cs.uah.edu>E<gt>

=cut


--- NEW FILE: Makefile.PL ---
use ExtUtils::MakeMaker;

WriteMakefile(
    NAME                => 'Sys::Hostname',
    VERSION_FROM        => 'Hostname.pm', 
    MAN3PODS		=> {}, 	# Pods will be built by installman.
    XSPROTOARG          => '-noprototypes',
);

--- NEW FILE: Hostname.xs ---
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#if defined(I_UNISTD) && defined(HAS_GETHOSTNAME)
# include <unistd.h>
#endif

/* a reasonable default */
#ifndef MAXHOSTNAMELEN
#  define MAXHOSTNAMELEN	256
#endif

/* swiped from POSIX.xs */
#if defined(__VMS) && !defined(__POSIX_SOURCE)
#  if ((__VMS_VER >= 70000000) && (__DECC_VER >= 50200000)) || (__CRTL_VER >= 70000000)
#    include <utsname.h>
#  endif
#endif

#ifdef I_SYSUTSNAME
#  include <sys/utsname.h>
#endif

MODULE = Sys::Hostname		PACKAGE = Sys::Hostname

void
ghname()
    PREINIT:
    IV   retval = -1;
    SV  *sv;
    PPCODE:
    EXTEND(SP, 1);
#ifdef HAS_GETHOSTNAME
    {
	char tmps[MAXHOSTNAMELEN];
	retval = PerlSock_gethostname(tmps, sizeof(tmps));
	sv = newSVpvn(tmps, strlen(tmps));
    }
#else
#  ifdef HAS_PHOSTNAME
    {
	PerlIO *io;
	char tmps[MAXHOSTNAMELEN];
	char   *p = tmps;
        char    c;
	io = PerlProc_popen(PHOSTNAME, "r");
	if (!io)
	    goto check_out;
	while (PerlIO_read(io, &c, sizeof(c)) == 1) {
	    if (isSPACE(c) || p - tmps >= sizeof(tmps))
		break;
	    *p++ = c;
	}
	PerlProc_pclose(io);
	*p = '\0';
	retval = 0;
	sv = newSVpvn(tmps, strlen(tmps));
    }
#  else
#    ifdef HAS_UNAME
    {
	struct utsname u;
	if (PerlEnv_uname(&u) == -1)
	    goto check_out;
	sv = newSVpvn(u.nodename, strlen(u.nodename));
        retval = 0;
    }
#    endif
#  endif
#endif
#ifndef HAS_GETHOSTNAME
    check_out:
#endif
    if (retval == -1)
	XSRETURN_UNDEF;
    else
	PUSHs(sv_2mortal(sv));