git

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#!/usr/bin/perl
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use 5.008001;
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use strict;
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use warnings;
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use IO::Pty;
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use File::Copy;
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# Run @$argv in the background with stdio redirected to $out and $err.
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sub start_child {
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	my ($argv, $out, $err) = @_;
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	my $pid = fork;
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	if (not defined $pid) {
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		die "fork failed: $!"
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	} elsif ($pid == 0) {
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		open STDOUT, ">&", $out;
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		open STDERR, ">&", $err;
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		close $out;
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		exec(@$argv) or die "cannot exec '$argv->[0]': $!"
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	}
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	return $pid;
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}
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# Wait for $pid to finish.
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sub finish_child {
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	# Simplified from wait_or_whine() in run-command.c.
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	my ($pid) = @_;
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	my $waiting = waitpid($pid, 0);
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	if ($waiting < 0) {
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		die "waitpid failed: $!";
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	} elsif ($? & 127) {
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		my $code = $? & 127;
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		warn "died of signal $code";
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		return $code + 128;
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	} else {
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		return $? >> 8;
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	}
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}
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sub xsendfile {
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	my ($out, $in) = @_;
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	# Note: the real sendfile() cannot read from a terminal.
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	# It is unspecified by POSIX whether reads
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	# from a disconnected terminal will return
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	# EIO (as in AIX 4.x, IRIX, and Linux) or
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	# end-of-file.  Either is fine.
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	copy($in, $out, 4096) or $!{EIO} or die "cannot copy from child: $!";
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}
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sub copy_stdio {
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	my ($out, $err) = @_;
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	my $pid = fork;
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	defined $pid or die "fork failed: $!";
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	if (!$pid) {
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		close($out);
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		xsendfile(\*STDERR, $err);
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		exit 0;
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	}
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	close($err);
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	xsendfile(\*STDOUT, $out);
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	finish_child($pid) == 0
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		or exit 1;
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}
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if ($#ARGV < 1) {
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	die "usage: test-terminal program args";
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}
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$ENV{TERM} = 'vt100';
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my $parent_out = new IO::Pty;
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my $parent_err = new IO::Pty;
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$parent_out->set_raw();
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$parent_err->set_raw();
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$parent_out->slave->set_raw();
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$parent_err->slave->set_raw();
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my $pid = start_child(\@ARGV, $parent_out->slave, $parent_err->slave);
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close $parent_out->slave;
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close $parent_err->slave;
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copy_stdio($parent_out, $parent_err);
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my $ret = finish_child($pid);
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exit($ret);
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