Re: [PATCH v4] Allow TTY tests to run under recent Mac OS

> Hi,
>
> Mike Blume wrote:
>
>> TTY tests were previously skipped on all Mac OS systems because of a
>> bug where reading from pty master occasionally hung. This bug has since
>> been found not to be reproducible under Mac OS 10.9 and 10.10.1.
>>
>> Therefore, run TTY tests under Mac OS 10.9 (Mavericks) and higher.
>
> *puzzled* Testing on Yosemite with the following script[1]
>
>         perl -MIO::Pty -MFile::Copy -e '
>                for (my $i = 0;; $i++) {
>                        my $master = new IO::Pty;
>                        my $slave = $master->slave;
>                        if (fork == 0) {
>                                close $master or die "close: $!";
>                                open STDOUT, ">&", $slave or die "dup2: $!";
>                                close $slave or die "close: $!";
>                                exec("echo", "hi", $i) or die "exec: $!";
>                        }
>                        close $slave or die "close: $!";
>                        copy($master, \*STDOUT) or die "copy: $!";
>                        close $master or die "close: $!";
>                        wait;
>                }
>         '
>
> still seems to hang eventually (after 61 iterations when my officemate
> tried it), reproducing the bug.
>
> Do you get a different result?

> The bug was originally found in an autobuilder that would run the test
> suite when new versions were pushed to check for regressions.  Even if
> the hang only happened 0.1% of the time, that would get the
> autobuilder stuck after a while, which was how the problem got
> noticed.