git/git

#!/usr/bin/perl
use 5.008001;
use strict;
use warnings;
use IO::Pty;
use File::Copy;

# Run @$argv in the background with stdio redirected to $in, $out and $err.
sub start_child {
    my ($argv, $in, $out, $err) = @_;
    my $pid = fork;
    if (not defined $pid) {
        die "fork failed: $!"
    } elsif ($pid == 0) {
        open STDIN, "<&", $in;
        open STDOUT, ">&", $out;
        open STDERR, ">&", $err;
        close $in;
        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_stdin {
    my ($in) = @_;
    my $pid = fork;
    if (!$pid) {
        xsendfile($in, \*STDIN);
        exit 0;
    }
    close($in);
    return $pid;
}

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";
}
$ENV{TERM} = 'vt100';
my $parent_in = new IO::Pty;
my $parent_out = new IO::Pty;
my $parent_err = new IO::Pty;
$parent_in->set_raw();
$parent_out->set_raw();
$parent_err->set_raw();
$parent_in->slave->set_raw();
$parent_out->slave->set_raw();
$parent_err->slave->set_raw();
my $pid = start_child(\@ARGV, $parent_in->slave, $parent_out->slave, $parent_err->slave);
close $parent_in->slave;
close $parent_out->slave;
close $parent_err->slave;
my $in_pid = copy_stdin($parent_in);
copy_stdio($parent_out, $parent_err);
my $ret = finish_child($pid);
# If the child process terminates before our copy_stdin() process is able to
# write all of its data to $parent_in, the copy_stdin() process could stall.
# Send SIGTERM to it to ensure it terminates.
kill 'TERM', $in_pid;
finish_child($in_pid);
exit($ret);