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
}
# 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, C<`hostname`>, C<`uname -n`>,
and the file F. If all that fails it Cs.
All NULs, returns, and newlines are removed from the result.
=head1 AUTHOR
David Sundstrom EFE
Texas Instruments
XS code added by Greg Bacon EFE
=cut