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Re: PATCH: Zpty cleanup (merge 13061 with 13116)
- X-seq: zsh-workers 13132
- From: Sven Wischnowsky <wischnow@xxxxxxxxxxxxxxxxxxxxxxx>
- To: zsh-workers@xxxxxxxxxxxxxx
- Subject: Re: PATCH: Zpty cleanup (merge 13061 with 13116)
- Date: Wed, 8 Nov 2000 11:20:23 +0100 (MET)
- In-reply-to: "Bart Schaefer"'s message of Sun, 5 Nov 2000 09:12:02 +0000
- Mailing-list: contact zsh-workers-help@xxxxxxxxxxxxxx; run by ezmlm
Bart Schaefer wrote:
> > There were some things in [read_poll()] I think were really wrong,
> > like testing `select() > 1' and like trying all possible tests if the
> > first tests worked but returned zero.
> However, that does not mean that the rest of the tests should be skipped
> when select() returns 0. A return of 0 means the select() timed out,
> which (apparently) might happen under Cygwin even if there actually are
> characters available to be read. Peter/Andrej, is that the case?
I don't know about Cygwin, but that blocking read (line 1381) is
exactly the test I wanted to avoid. When building the patch I had a
case where zpty was waiting in checkptycmd() because of that (select()
correctly had returned zero, saying that there wasn't anything to be
read, the `timeout' being zero after all means that the select should
just do a poll, not wait).
I don't know if I can reproduce it, maybe I'll try at the weekend.
> [Late-breaking note: *Somebody* should have noticed that read_poll()
> calls gettyinfo() and settyinfo(), which of course affects SHTTY, and
> has nothing whatever to do with the pty. So polltty=1 is just a very
> expensive no-op for zpty, and it really must pass 0.]
Hmhm. I wasn't too happy with calling read_poll() in zpty.c
anyway. The problem I wanted to solve is, of course, that a zpty
command should be marked as `finished' if there is still input to be
read even though the OS tells us that the process has exited (which
can happen and is very ugly).
I don't have any particular comments or patches for the other things. Yet.
Sven Wischnowsky wischnow@xxxxxxxxxxxxxxxxxxxxxxx
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