<companion_cube>
I'm trying to call a subprocess and read its output, using Unix.create_process "/bin/foo" [|"foo";"bar"|] o1 i2 i2 (with o1,i1 and o2,i2 create via Unix.pipe ())
<adrien>
use a library to do that :P
<companion_cube>
but as I read the output of the process (converted to a in_channel), it blocks
<companion_cube>
and never reaches the end of file
<companion_cube>
adrien: like what?
<adrien>
things to watch for: close-on-exec for your file descripts, and use Unix.select
<adrien>
companion_cube: I think Batteries at least has it, maybe extlib (I wonder what are the sizes of the two libs); otherwise, what is the license of your code?
<companion_cube>
should I have close-on-exec ?
<companion_cube>
adrien: GPL
<companion_cube>
s/have/use/
<adrien>
2, 3?
<companion_cube>
2
<adrien>
hmmmmmm
<adrien>
well, you can look at http://git.ocamlcore.org/cgi-bin/gitweb.cgi?p=yypkg/yypkg.git;a=blob;f=src/lib.ml;h=39440e7f18e5946711b75fa38c7f1db036ff5f9e;hb=HEAD#l91 and a bit above, I think it's correct (now)
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<companion_cube>
looks interesting, thanks
<adrien>
it's GPLv3 :P
<adrien>
which is incompatible with GPLv2 :D
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<adrien>
(before anyone says the GPL and the FSF suck, it's partly because of the patent clause, which is something that the Apache license has created, and which is mostly regarded as "good")
<companion_cube>
aww
<adrien>
you don't need to copy verbatim
<companion_cube>
it looks like once the process is done, they can read everything... but for my (simpler) implementation I tried to read everything before the process is done, hoping that End_of_file would come eventually...
<adrien>
you can't hold an infinite amount of data in a pipe
<adrien>
so if you don't read anything, the writing process will eventually block
<adrien>
also, I think EOF won't come if you two processes have the writing end opened, which is the case by default when you fork and haven't used close-on-exec
<companion_cube>
that's why first I send my data in the stdin of the subprocess, close the stdin, and then read its output as it produces it
<companion_cube>
oh, I see
<companion_cube>
then if I close_on_exec the write part of the stdout of the subprocess, and the read part of its stdin... ?
<adrien>
basically, what you want is to avoid having file descriptors opened in the two processes; you can chose how you want to achieve that =)
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<companion_cube>
but I still need some of them to stay opened, to read the ouput of the subprocess :/
<adrien>
yes but the process that reads should not have the writing end opened
<adrien>
and the process that writes should not have the reading end opeed
<companion_cube>
ok, I think create_process is not flexible enough then, back to fork and exec -_-
<adrien>
it is: proof, I'm using it
<companion_cube>
but you feed the subprocess with stdin, whereas I feed it with a pipe, which means I have to make the subprocess close the read end of its input pipe
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<adrien>
I see; yes, depending on what you run and the control you have on it, you can need to change how you do things
<adrien>
however, keep in mind that windows has no fork()
<companion_cube>
well, that's why it's called "Unix" :D
<companion_cube>
besides, I don't use windows, and it's hard enough to make it work on unix...
<companion_cube>
(I miss python for this kind of things :/)
<adrien>
there's probably something quite simple to handle both unix and windows but I can't think right now
<adrien>
just make a nicely-delimited function so it can be changed easily =)
<companion_cube>
yep :)
<companion_cube>
thank you
<companion_cube>
well,it works much better with fork. Just have to find the duplicate close() ;)
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<adrien>
wasn't there recently some mention of using linux' "perf" with ocaml?
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<hcarty>
adrien: On Mantis. I think that there is a patch.
<hcarty>
thelema: I was wondering the same re:oasis and Object sections.
<hcarty>
thelema: Also, thank you for being a voice of calm and reason yesterday.
<hcarty>
adrien: You're welcome. At some point I subscribed to an RSS with lots of OCaml mantis activity. I don't remember which feed it is, but the results are certainly interesting.
<hcarty>
adrien: It's the Mantis RSS, which makes sense.
<adrien>
heheh :-)
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<thelema>
hcarty: you're welcome
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<adrien>
bah, now I'm trying to find out what camlp4's RfTag was
<adrien>
I have nothing about it except that it seems related to variants
<adrien>
(talking about saffire)
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<hcarty>
thelema: I think the Object support is for building .cmx and .cmo output.
<hcarty>
thelema: That's what I gather from the diff
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<thelema>
hcarty: ah, interesting. I guess oasis didn't have support for that before.
<adrien>
it didn't afaik
<adrien>
iirc that was a complaint from Daniel Bünzli not very long ag
<adrien>
o
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<wmeyer>
adrien: Saffire is a tool isn't it? you can use any previous version of OCaml + Camlp4 you want, unless you want to port it
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<adrien>
wmeyer: I could; it wouldn't handle anything new in the syntax but that is probably quite uncommon in bindings code
<adrien>
I'd like to have it updated and easily usable actully
<adrien>
actually*
<adrien>
I've created a project on the forge; I don't know which results it can give but it could be very interesting
<wmeyer>
adrien: yes, I think it would need some work, but it would be useful to have it, thanks! I might run it on some of my C glue
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<Anarchos>
Porting the runtime into an exotic assembler is not easy :)
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