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BEGIN { $| = 1; print "1..7\n"; }
use Socket;
use IO::FDPass;
print "ok 1\n";
socketpair my $fh1, my $fh2, AF_UNIX, SOCK_STREAM, 0
or die "socketpair: $!";
socketpair my $fh3, my $fh4, AF_UNIX, SOCK_STREAM, 0
or die "socketpair: $!";
print "ok 2\n";
my $pid = fork;
defined $pid
or die "fork: $!";
unless ($pid) {
close $fh3;
my $fd = IO::FDPass::recv fileno $fh2;
print $fd > 0 ? "" : "not ", "ok 4 # $fd\n";
open my $fh, "+<&=$fd"
or die "open(fd) failed: $!";
sysread $fh, my $buf, 1
or die "sysread(child) failed: $!";
print $buf eq "4" ? "" : "not ", "ok 5 # $buf\n";
syswrite $fh, "3", 1
or die "syswrite(child) failed: $!";
exit;
}
print "ok 3\n";
IO::FDPass::send fileno $fh1, fileno $fh4
or die "send failed: $!";
close $fh4;
syswrite $fh3, "4", 1
or die "syswrite(parent) failed: $!";
sysread $fh3, my $buf, 1
or die "sysread(parent) failed: $!";
print $buf eq "3" ? "" : "not ", "ok 6 # $buf\n";
print "ok 7\n";
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