source: trunk/essentials/dev-lang/perl/ext/IO/t/io_unix.t

#!./perl

BEGIN {
    unless(grep /blib/, @INC) {
        chdir 't' if -d 't';
        @INC = '../lib';
    }
}

use Config;

BEGIN {
    if(-d "lib" && -f "TEST") {
        my $reason;
        if (! $Config{'d_fork'}) {
            $reason = 'no fork';
        }
        elsif ($Config{'extensions'} !~ /\bSocket\b/) {
            $reason = 'Socket extension unavailable';
        }
        elsif ($Config{'extensions'} !~ /\bIO\b/) {
            $reason = 'IO extension unavailable';
        }
        elsif ($^O eq 'os2') {
            require IO::Socket;

            eval {IO::Socket::pack_sockaddr_un('/foo/bar') || 1}
              or $@ !~ /not implemented/ or
                $reason = 'compiled without TCP/IP stack v4';
        } elsif ($^O =~ m/^(?:qnx|nto|vos)$/ ) {
            $reason = 'Not implemented';
        }
        if ($reason) {
            print "1..0 # Skip: $reason\n";
            exit 0;
        }
    }
}

$PATH = "sock-$$";

# Test if we can create the file within the tmp directory
if (-e $PATH or not open(TEST, ">$PATH") and $^O ne 'os2') {
    print "1..0 # Skip: cannot open '$PATH' for write\n";
    exit 0;
}
close(TEST);
unlink($PATH) or $^O eq 'os2' or die "Can't unlink $PATH: $!";

# Start testing
$| = 1;
print "1..5\n";

use IO::Socket;

$listen = IO::Socket::UNIX->new(Local=>$PATH, Listen=>0) || die "$!";
print "ok 1\n";

if($pid = fork()) {

    $sock = $listen->accept();

    if (defined $sock) {
        print "ok 2\n";

        print $sock->getline();

        print $sock "ok 4\n";

        $sock->close;

        waitpid($pid,0);
        unlink($PATH) || $^O eq 'os2' || warn "Can't unlink $PATH: $!";

        print "ok 5\n";
    } else {
        print "# accept() failed: $!\n";
        for (2..5) {
            print "not ok $_ # accept failed\n";
        }
    }
} elsif(defined $pid) {

    $sock = IO::Socket::UNIX->new(Peer => $PATH) or die "$!";

    print $sock "ok 3\n";

    print $sock->getline();

    $sock->close;

    exit;
} else {
 die;
}