Re: W02jobs.ztst: huge delay if output is piped (macOS)

On Sat, Jul 4, 2026 at 1:31 AM Bart Schaefer <[email protected]> wrote:
>
> On Fri, Jul 3, 2026 at 10:44 AM Mikael Magnusson <[email protected]> wrote:
> >
> > % make TESTNUM=W02 check | cat
> > ... test output ...
> > ***********************************************
> > 1 successful test script, 0 failures, 0 skipped
> > ***********************************************
> > make[1]: Leaving directory '/.../zsh/Test'
> > [this is where the 100 second delay happens]
>
> I tried
> % make TESTNUM=W02 check | strace cat
>
> on Ubuntu 24.04.4 and I don't see the delay.  Nor do I see any
> reference to fd=12 in the "cat" child.
>
> > I agree that there doesn't seem to be a
> > reason that this sleep should be so long, though
>
> The test needs sleep to survive long enough for the shell driving zpty
> to read back the PID, send a "kill -STOP", and then attempt "fg %-"
> and read the output of "jobs".  It probably doesn't need "sleep 100"
> but a single-digit sleep might not be long enough.

I forgot to mention that it doesn't happen every time for me, though
it does seem to happen almost every time. Worth trying a few times
just to see though.

-- 
Mikael Magnusson