* open-input-pipe messes with output buffers
@ 2002-08-29 18:28 Neale Pickett
2002-08-29 20:11 ` Thien-Thi Nguyen
0 siblings, 1 reply; 2+ messages in thread
From: Neale Pickett @ 2002-08-29 18:28 UTC (permalink / raw)
I'm experiencing some strange behavior using open-input-pipe while
having open output ports. It seems like whenever I call
open-input-pipe, whatever's in the output buffer gets re-buffered, so I
get an additional copy in the output port.
For example, this guile program:
(use-modules (ice-9 popen))
(let ((outp (open-output-file "goo")))
(display "foobie" outp)
(newline outp)
;;(flush-all-ports)
(let ((jh (open-input-pipe "/bin/ls")))
(display (read-line jh) outp)
(newline outp))
(display "shoobie" outp)
(newline outp))
Produces this in the file "goo":
foobie
foobie
a.py
shoobie
Uncommenting the (flush-all-ports) line does what I expected with it
commented:
foobie
a.py
shoobie
Is this the desired behavior? It's pretty confusing to me, but I've only
been using guile for a month :)
Thanks
Neale
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* Re: open-input-pipe messes with output buffers
2002-08-29 18:28 open-input-pipe messes with output buffers Neale Pickett
@ 2002-08-29 20:11 ` Thien-Thi Nguyen
0 siblings, 0 replies; 2+ messages in thread
From: Thien-Thi Nguyen @ 2002-08-29 20:11 UTC (permalink / raw)
Cc: guile-user
From: Neale Pickett <neale@woozle.org>
Date: 29 Aug 2002 11:28:39 -0700
[rebuffering weirdness w/ popen + test case]
Is this the desired behavior?
older versions of guile did not separate fdes and port handling properly
when doing pipe operations. guile-1.4.1.8 DTRT, for example. to try:
wget http://www.glug.org/tmp/2002-08/guile-1.4.1.8.tar.gz
tar xzf guile-1.4.1.8.tar.gz
cd guile-1.4.1.8 && ./configure --prefix /tmp/a/b/c && make install
alias guile=/tmp/a/b/c/bin/guile
i believe 1.5.x works too, but i don't recommend that for other reasons.
thi
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