From: Adrien Nader <adrien@notk.org>
To: Thomas Braibant <thomas.braibant@gmail.com>
Cc: OCaML Mailing List <caml-list@inria.fr>
Subject: Re: [Caml-list] Unix file descriptors vs. in/out channels
Date: Mon, 18 Aug 2014 18:10:29 +0200 [thread overview]
Message-ID: <20140818161029.GA13445@notk.org> (raw)
In-Reply-To: <CAHR=VkwXynFAJm13MwKrsJNgx4HeW_LU03BQxqD4S7prG1A8Rw@mail.gmail.com>
Hi,
You cannot safely mix buffered (in/out_channel) and un-buffered
(file_descr) uses of the same underlying resource.
IIRC an in_channel or out_channel has a buffer in OCaml memory.
If you close the underlying file_descr of an out_channel with
functions operating on file desriptors directly, it is possible that
some data will still be buffered.
If you read alternatively through file_descr and in_channel, you might
skip some data if reading with the in_channel reads more than just "n
chars" (it could read 4K for instance, I'm not completely sure).
As for using in/out_channel_of_descr more than once, I don't know
offhand: if it creates new buffers each time (likely), it will be an
issue.
--
Adrien Nader
next prev parent reply other threads:[~2014-08-18 16:10 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-18 14:42 Thomas Braibant
2014-08-18 16:10 ` Adrien Nader [this message]
2014-08-18 16:15 ` Edouard Evangelisti
2014-08-18 16:29 ` Thomas Braibant
2014-08-18 16:33 ` Xavier Leroy
2014-08-18 16:52 ` Thomas Braibant
2014-08-18 16:57 ` Xavier Leroy
2014-08-18 17:18 ` Thomas Braibant
2014-08-18 17:55 ` David Sheets
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