* coprocess file descriptor p isn't closed after coprocess exits
@ 2009-07-29 19:19 Mikael Magnusson
2009-07-29 23:46 ` Bart Schaefer
0 siblings, 1 reply; 2+ messages in thread
From: Mikael Magnusson @ 2009-07-29 19:19 UTC (permalink / raw)
To: zsh-workers
The commit message for the read -q fix mentioned read -p, so i did
read -<tab> to see the description and didn't see anything. Turns out
it only completes -p if you have a coproc open since -p reads from the
coprocess. However, after you kill the coprocess it still completes
-p. This made me a bit suspicious and i played around with >&p (which
the completer uses to test if there is a coprocess).
% zsh -f; echo oops: $?
% true >&p
zsh: coprocess: bad file descriptor
% echo >&p
zsh: coprocess: bad file descriptor
% coproc true
[1] 5794
%
[1] + done true
% true >&p && echo $?
0
% echo >&p && echo $?
oops: 141
I've tried this on 4.3.5 and fairly recent zsh cvs.
[ doing trap 'echo oops i got a sigpipe' PIPE gives an amusing (and
ctrl-c-able) loop of
echo: write error: broken pipe
zsh: write error: broken pipe ]
I couldn't figure out any syntax for closing the p descriptor manually
like you would do with exec 2>&-
p>&- obviously just tries to run the command 'p'.
--
Mikael Magnusson
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: coprocess file descriptor p isn't closed after coprocess exits
2009-07-29 19:19 coprocess file descriptor p isn't closed after coprocess exits Mikael Magnusson
@ 2009-07-29 23:46 ` Bart Schaefer
0 siblings, 0 replies; 2+ messages in thread
From: Bart Schaefer @ 2009-07-29 23:46 UTC (permalink / raw)
To: Mikael Magnusson, zsh-workers
On Jul 29, 9:19pm, Mikael Magnusson wrote:
} Subject: coprocess file descriptor p isn't closed after coprocess exits
The coprocess descriptor is like any other FIFO; it stays open until
both ends are done with it. See more explanation in
http://www.zsh.org/mla/users/2009/msg00574.html
} I couldn't figure out any syntax for closing the p descriptor manually
} like you would do with exec 2>&-
Nothing about coproc has changed in 10 years, so:
http://www.zsh.org/mla/users/1999/msg00619.html
^ permalink raw reply [flat|nested] 2+ messages in thread
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2009-07-29 19:19 coprocess file descriptor p isn't closed after coprocess exits Mikael Magnusson
2009-07-29 23:46 ` Bart Schaefer
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