Zsh Mailing List Archive
Messages sorted by:
Reverse Date,
Date,
Thread,
Author
RE: Bug in cygwin with select and master pty
- X-seq: zsh-workers 13157
- From: "Andrej Borsenkow" <Andrej.Borsenkow@xxxxxxxxxxxxxx>
- To: <cgf@xxxxxxxxxx>, <zsh-workers@xxxxxxxxxxxxxx>
- Subject: RE: Bug in cygwin with select and master pty
- Date: Mon, 13 Nov 2000 14:12:50 +0300
- Importance: Normal
- In-reply-to: <20001112151935.A19351@xxxxxxxxxxxxxxxxxx>
- Mailing-list: contact zsh-workers-help@xxxxxxxxxxxxxx; run by ezmlm
> -----Original Message-----
> From: cgf@xxxxxxxxxx [mailto:cgf@xxxxxxxxxx]
> Sent: Sunday, November 12, 2000 11:20 PM
> To: zsh-workers@xxxxxxxxxxxxxx
> Subject: Re: Bug in cygwin with select and master pty
>
>
> In article <001e01c049b7$7f159ea0$21c9ca95@xxxxxxxxxxxxxx>,
> Andrej Borsenkow <Andrej.Borsenkow@xxxxxxxxxxxxxx> wrote:
> >> } About select - so far there seems to be no known problems under cygwin
> >> } (that does not mean, there are no problems).
> >>
> >>OK, if there are no known problems with select, then the test on line
> >>1376 can change from `ret <= 0' to `ret < 0' -- and in that case it's
> >>possible that we could split read_poll() into two cases, HAVE_SELECT v.
> >>all the other code that's there. I won't do that for now, though.
> >
> >Life is fun. 5 minutes later I discovered a bug that made blocking
> >multiline reads (with or without pattern) hang at the end of the first
> >line. I sent sort of a patch to cygwin list, but I am not sure if it
> >really does the right thing (it fixed the bug I've seen, O.K. The
> >question is whether it introduced another bugs :-)
>
> I didn't see any followup to this but the new (1.1.5) release of cygwin
> should not have this problem.
>
Chris, are you hearing on this list too?
> >Anyway, fiddling with currently released versions of cygwin is pretty
> >useless wrt to zpty (all of them are buggy in some way). Unfortunately
> >(to us) zsh seems to be the only program that has these problems. With
> >all implications.
>
> Have all of these problems been reported to the cygwin mailing list? Are
> there still problems in 1.1.5?
>
Yes. Build problem with termcap, EOF problem with pty, one more problem in
pre-1.1.5 snapshots and the above select problem.
The select problem is not fixed in 1.1.5-6.
> >The pgrp problem still remains.
>
> What is the pgrp problem? Was this reported to the cygwin mailing list?
>
Some zpty code was changed and now zsh cannot attach to allocated pty (with
error message cannot set pgrp). No, this was not reported to cygwin list
because
- the problem resulted from zsh code change, so I first had to make sure it
was cygwin problem
- I have had enough "this is open source" replies. I'm sorry to say, but
reporting anything to cygwin list is pretty useless unless one can either
provide a patch or two-line program to reproduce the problem. I currently
cannot do either.
If you do not mind to update zsh CVS, you can see the last problem. Just do
something like
zmodload zsh/zpty
zpty sh /bin/sh
and now we have:
mw1g017@MW1G17C% zmodload zsh/zpty
mw1g017@MW1G17C% zpty sh /bin/sh
mw1g017@MW1G17C% ps -l
PID PPID PGID WINPID TTY UID STIME COMMAND
1592 1 1592 1592 0 1006 14:05:53 /usr/bin/zsh
1596 1592 1596 1596 -1 1006 14:06:14 /usr/bin/zsh
1620 1592 1620 1624 0 1006 14:06:33 /usr/bin/ps
where provess 1596 is a child that tried to attach to allocated pty. If you
read the output you get:
mw1g017@MW1G17C% zpty -r sh foo \*$'\n'
mw1g017@MW1G17C% print -r $foo
zsh: can't set tty pgrp: not owner
This did work before last change; the main change was that zsh now opens both
master and slave fd's of pty with O_NOCTTY. This works on Unix.
-andrej
Messages sorted by:
Reverse Date,
Date,
Thread,
Author