--- /dev/null
+ #!/usr/bin/perl
++use 5.008;
+ use strict;
+ use warnings;
+ use IO::Pty;
+ use File::Copy;
+
+ # Run @$argv in the background with stdio redirected to $out and $err.
+ sub start_child {
+ my ($argv, $out, $err) = @_;
+ my $pid = fork;
+ if (not defined $pid) {
+ die "fork failed: $!"
+ } elsif ($pid == 0) {
+ open STDOUT, ">&", $out;
+ open STDERR, ">&", $err;
+ close $out;
+ exec(@$argv) or die "cannot exec '$argv->[0]': $!"
+ }
+ return $pid;
+ }
+
+ # Wait for $pid to finish.
+ sub finish_child {
+ # Simplified from wait_or_whine() in run-command.c.
+ my ($pid) = @_;
+
+ my $waiting = waitpid($pid, 0);
+ if ($waiting < 0) {
+ die "waitpid failed: $!";
+ } elsif ($? & 127) {
+ my $code = $? & 127;
+ warn "died of signal $code";
+ return $code - 128;
+ } else {
+ return $? >> 8;
+ }
+ }
+
+ sub xsendfile {
+ my ($out, $in) = @_;
+
+ # Note: the real sendfile() cannot read from a terminal.
+
+ # It is unspecified by POSIX whether reads
+ # from a disconnected terminal will return
+ # EIO (as in AIX 4.x, IRIX, and Linux) or
+ # end-of-file. Either is fine.
+ copy($in, $out, 4096) or $!{EIO} or die "cannot copy from child: $!";
+ }
+
+ sub copy_stdio {
+ my ($out, $err) = @_;
+ my $pid = fork;
+ defined $pid or die "fork failed: $!";
+ if (!$pid) {
+ close($out);
+ xsendfile(\*STDERR, $err);
+ exit 0;
+ }
+ close($err);
+ xsendfile(\*STDOUT, $out);
+ finish_child($pid) == 0
+ or exit 1;
+ }
+
+ if ($#ARGV < 1) {
+ die "usage: test-terminal program args";
+ }
+ my $master_out = new IO::Pty;
+ my $master_err = new IO::Pty;
+ my $pid = start_child(\@ARGV, $master_out->slave, $master_err->slave);
+ close $master_out->slave;
+ close $master_err->slave;
+ copy_stdio($master_out, $master_err);
+ exit(finish_child($pid));