105 lines
2.3 KiB
Perl
Executable file
105 lines
2.3 KiB
Perl
Executable file
#!/usr/bin/perl
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use 5.008;
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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 $in, $out and $err.
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sub start_child {
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my ($argv, $in, $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 STDIN, "<&", $in;
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open STDOUT, ">&", $out;
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open STDERR, ">&", $err;
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close $in;
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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: $!";
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}
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sub copy_stdin {
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my ($in) = @_;
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my $pid = fork;
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if (!$pid) {
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xsendfile($in, \*STDIN);
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exit 0;
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}
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close($in);
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return $pid;
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}
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sub copy_stdio {
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my ($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 $master_in = new IO::Pty;
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my $master_out = new IO::Pty;
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my $master_err = new IO::Pty;
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$master_in->set_raw();
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$master_out->set_raw();
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$master_err->set_raw();
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$master_in->slave->set_raw();
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$master_out->slave->set_raw();
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$master_err->slave->set_raw();
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my $pid = start_child(\@ARGV, $master_in->slave, $master_out->slave, $master_err->slave);
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close $master_in->slave;
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close $master_out->slave;
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close $master_err->slave;
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my $in_pid = copy_stdin($master_in);
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copy_stdio($master_out, $master_err);
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my $ret = finish_child($pid);
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# If the child process terminates before our copy_stdin() process is able to
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# write all of its data to $master_in, the copy_stdin() process could stall.
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# Send SIGTERM to it to ensure it terminates.
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kill 'TERM', $in_pid;
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finish_child($in_pid);
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exit($ret);
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