Re: ZSH performance regression in 5.8.1.2-test

[Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>]

On Tue, Apr 26, 2022 at 7:37 AM Jun. T <takimoto-j@xxxxxxxxxxxxxxxxx> wrote:
>
> But at least on my Mac the following seems to work also:
>
>     if (lseek(SHIN, 0, SEEK_CUR) == 0)
>           rsize = SHINBUFSIZE;
>
> # Have you found a case in which lseek(SHIN, 0, SEEK_CUR) fails
> # when it shouldn't fail, or does not fail when it should fail?

I was pretty sure I'd found a case (on Ubuntu 20.04) where it
succeeded on a pipe when there was already data written to the pipe
before the seek was attempted.  That was only/exactly for (0,
SEEK_CUR).

However, I can check that again.  If that is the false-success mode,
it won't be tested by PWS's little C program in workers/50108