From: "Bart Schaefer" <schaefer@candle.brasslantern.com>
To: zsh-workers@sunsite.auc.dk
Subject: Re: PATCH: Misc. zpty tweaks, plus commentary
Date: Sun, 5 Nov 2000 01:59:58 +0000 [thread overview]
Message-ID: <1001105015958.ZM7352@candle.brasslantern.com> (raw)
In-Reply-To: <1001104232950.ZM3561@candle.brasslantern.com>
On Nov 4, 11:29pm, I wrote:
}
} `zpty -w' already was able to stream into the pty (even though that's
} not documented); e.g. `zpty -w foo < file' writes the entire contents
} of the file to the pty [...] Now `zpty -r foo' can stream the output
} as well. Unfortunately, it's still not possible to do both at once.
}
} The problem is that whenever zsh forks a builtin, it closes all
} descriptors numbered higher than 10, which includes the master pty
} descriptor.
Although a C-code-level fix would be preferable, a workaround has just
occurred to me: Using a subshell will prevent the descriptors from
being closed. So with 13116 applied, you should be able to do:
zpty -b foo cat
yes blah | (zpty -w foo) &
(zpty -r foo) | less
zpty -d foo
This reveals that still another remaining problem is that `zpty -w' on a
blocking pty doesn't stop when the process on the pty is killed. There
doesn't seem to be any simple fix for this; write() itself is blocked,
and does not get interrupted with SIGPIPE as would normally occur.
--
Bart Schaefer Brass Lantern Enterprises
http://www.well.com/user/barts http://www.brasslantern.com
Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net
next prev parent reply other threads:[~2000-11-05 2:00 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-11-04 23:29 Bart Schaefer
2000-11-05 1:59 ` Bart Schaefer [this message]
2000-11-05 4:35 ` Bart Schaefer
2000-11-05 9:12 ` PATCH: Zpty cleanup (merge 13061 with 13116) Bart Schaefer
2000-11-08 14:03 ` read_poll " Andrej Borsenkow
2000-11-08 10:20 Sven Wischnowsky
2000-11-08 10:42 ` Andrej Borsenkow
2000-11-08 14:09 read_poll " Sven Wischnowsky
2000-11-08 14:46 ` Andrej Borsenkow
2000-11-08 15:58 ` PATCH: read_poll " Bart Schaefer
2000-11-08 17:00 ` Bart Schaefer
2000-11-08 19:10 ` Bug in cygwin with select and master pty Andrej Borsenkow
2000-11-13 10:21 PATCH: Misc. zpty tweaks, plus commentary Sven Wischnowsky
2000-11-13 16:20 ` Bart Schaefer
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