* open-output-pipe problem
@ 2002-07-13 13:56 Satoru Takabayashi
0 siblings, 0 replies; 4+ messages in thread
From: Satoru Takabayashi @ 2002-07-13 13:56 UTC (permalink / raw)
Hi!
I tried guile 1.4.1 and found a problem on open-output-pipe.
% cat x.scm
(use-modules (ice-9 popen))
(let ((port (open-output-pipe "tr a-z A-Z")))
(write-line "abc123" port)
(close-pipe port))
With guile 1.3.4, it works fine.
% /usr/bin/guile -s x.scm # guile 1.3.4
ABC123
%
Hoever, with guile 1.4.1, it doesn't produce any outputs.
% /usr/local/bin/guile -s x.scm # guile 1.4.1
%
Thanks,
-- Satoru Takabayashi
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* Re: open-output-pipe problem
@ 2002-08-01 20:13 Thien-Thi Nguyen
2002-08-08 3:20 ` Thien-Thi Nguyen
0 siblings, 1 reply; 4+ messages in thread
From: Thien-Thi Nguyen @ 2002-08-01 20:13 UTC (permalink / raw)
Cc: bug-guile
From: Satoru Takabayashi <satoru@namazu.org>
Date: Sat, 13 Jul 2002 22:56:57 +0900
I tried guile 1.4.1 and found a problem on open-output-pipe.
hi, thanks for the bug report. i have reproduced the problem and
noticed that it is gone in guile-HEAD, but have not yet figured out
which of the (many) changes is responsible for the fixed behavior.
i plan to devote some hours looking into this because it is an area of
libguile i'd like to learn more about. will let you know what i find.
thi
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* Re: open-output-pipe problem
2002-08-01 20:13 open-output-pipe problem Thien-Thi Nguyen
@ 2002-08-08 3:20 ` Thien-Thi Nguyen
2002-08-09 1:08 ` Thien-Thi Nguyen
0 siblings, 1 reply; 4+ messages in thread
From: Thien-Thi Nguyen @ 2002-08-08 3:20 UTC (permalink / raw)
From: Thien-Thi Nguyen <ttn@giblet.glug.org>
Date: Thu, 01 Aug 2002 13:13:18 -0700
will let you know what i find.
i found that for the simple test case given, reverting popen.scm to the
one provided w/ guile-1.3.4 makes it work. i believe the relevant entry
for the 1.3.4 - 1.4.1 change is:
2000-04-10 Gary Houston <ghouston@arglist.com>
* popen.scm (open-process): after forking, close all ports except
the end of the pipe to the parent. otherwise move->fdes and
the exec'd program and the exit handlers can interfere with file
descriptors still in use in parent ports.
this seems to address a legitimate concern. in HEAD (and presumably
1.6.x although i haven't checked) there is also:
2000-11-06 Gary Houston <ghouston@arglist.com>
* popen.scm (open-process): bug fix: don't use
close-all-ports-except to close ports in the child process, since
it causes port buffers to be flushed. they may be flushed again
in the parent, causing duplicate output. use a more elaborate
method for setting up the child descriptors (thanks to David
Pirotte for the bug report).
standard file descriptors 0, 1, 2 in the child process
are now set up from current-input-port etc., where possible.
so it looks like simply reverting to 1.3.4 popen.scm would not be
acceptable; 1.4.x captures a part-way fix that needs to be pushed
forward to completion. i have experimented w/ back-porting the new
popen.scm (including associated support in libguile) w/o success, so
there is more investigation to do to see what else is going on. by the
time this is fixed i'll know a lot more about how ports are done in
guile, that's for sure...
thi
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* Re: open-output-pipe problem
2002-08-08 3:20 ` Thien-Thi Nguyen
@ 2002-08-09 1:08 ` Thien-Thi Nguyen
0 siblings, 0 replies; 4+ messages in thread
From: Thien-Thi Nguyen @ 2002-08-09 1:08 UTC (permalink / raw)
Cc: bug-guile
From: Thien-Thi Nguyen <ttn@giblet.glug.org>
Date: Wed, 07 Aug 2002 20:20:48 -0700
i have experimented w/ back-porting the new popen.scm (including
associated support in libguile) w/o success [...]
turns out i was laboring under the classic stupidity of forgetting to
unpack an SCM... live and learn. in any case, please find below a
uuencoded tarball containing
libguile/ioext.h
libguile/ioext.c
ice-9/popen.scm
that you should be able to able to unpack in the guile-1.4.1 top-level
directory. as you may notice, popen.scm `open-process' now closes file
descriptors instead of ports, following the change in HEAD. however,
the implementation is more straightforward than in HEAD, w/ only one
addition to libguile (`scm_close_all_fdes_except' and associated scheme
binding). you might notice other changes to popen.scm; those are
related to the documentation methodology and are not relevant to its
operation.
please rebuild and let me know of any problems.
thi
_______________________________________
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-R_^Z_`VOC+B9`'@`````
`
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2002-08-01 20:13 open-output-pipe problem Thien-Thi Nguyen
2002-08-08 3:20 ` Thien-Thi Nguyen
2002-08-09 1:08 ` Thien-Thi Nguyen
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2002-07-13 13:56 Satoru Takabayashi
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