From: Basile STARYNKEVITCH <basile@starynkevitch.net>
To: caml-list@inria.fr
Subject: [Caml-list] Unix.lseek versus Pervasives.pos
Date: Tue, 18 Mar 2003 07:54:13 +0100 [thread overview]
Message-ID: <15990.49813.28217.829156@hector.lesours> (raw)
In-Reply-To: <2EECE9D8-58CA-11D7-A8F0-000393942C76@ece.ucsb.edu>
>>>>> "Shivkumar" == Shivkumar Chandrasekaran <shiv@ece.ucsb.edu> writes:
Shivkumar> Hi, Currently I am trying to handle "LargeFiles" while
Shivkumar> marshalling caml values and I have run into this
Shivkumar> incidental problem (nothing to do with LargeFile). If I
Shivkumar> open a file with "open_out_bin", write to it using
Shivkumar> "output_value"
You apparently forgot to flush the channel.
Shivkumar> and then try to determine the position
Shivkumar> in the file using "pos", I get the correct
Shivkumar> value. However, if I use Unix.lseek thus
Shivkumar> Unix.lseek (Unix.descr_of_out_channel fd_out) 0
Shivkumar> Unix.SEEK_CUR
Shivkumar> I get a different value (so far always 0)
Forgetting to flush files on most systems should give similar
errors. Flushing files is not Ocaml specific, but a general issue (at
least under Unix, and probably Windows).
Perhaps the Ocaml manual could add as a hint to never forget flushing
files (but the tip might be there already), but this hint is very
basic & generic and is not Ocaml specific.
Regards.
--
Basile STARYNKEVITCH http://starynkevitch.net/Basile/
email: basile<at>starynkevitch<dot>net
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next prev parent reply other threads:[~2003-03-18 6:54 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-17 22:45 Shivkumar Chandrasekaran
2003-03-18 6:54 ` Basile STARYNKEVITCH [this message]
[not found] <46CF368E-5912-11D7-8289-000A95773ED2@rouaix.org>
2003-03-18 17:35 ` Shivkumar Chandrasekaran
2003-03-18 17:39 ` Shivkumar Chandrasekaran
2003-03-19 20:27 ` Xavier Leroy
2003-03-19 18:36 cashin
2003-03-19 18:48 ` Nicolas George
2003-03-19 19:01 ` cashin
2003-03-19 18:55 ` Ken Rose
2003-03-19 19:08 ` Basile STARYNKEVITCH
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