From mboxrd@z Thu Jan 1 00:00:00 1970 Received: (from majordomo@localhost) by pauillac.inria.fr (8.7.6/8.7.3) id KAA19267; Sat, 31 Jan 2004 10:38:08 +0100 (MET) X-Authentication-Warning: pauillac.inria.fr: majordomo set sender to owner-caml-list@pauillac.inria.fr using -f Received: from nez-perce.inria.fr (nez-perce.inria.fr [192.93.2.78]) by pauillac.inria.fr (8.7.6/8.7.3) with ESMTP id KAA19543 for ; Sat, 31 Jan 2004 10:38:07 +0100 (MET) Received: from pauillac.inria.fr (pauillac.inria.fr [128.93.11.35]) by nez-perce.inria.fr (8.11.1/8.11.1) with ESMTP id i0V9c6v17665; Sat, 31 Jan 2004 10:38:06 +0100 (MET) Received: (from xleroy@localhost) by pauillac.inria.fr (8.7.6/8.7.3) id KAA19363; Sat, 31 Jan 2004 10:38:06 +0100 (MET) Date: Sat, 31 Jan 2004 10:38:06 +0100 From: Xavier Leroy To: Matt Gushee Cc: caml-list@inria.fr Subject: Re: [Caml-list] Apparent I/O bug Message-ID: <20040131103806.B17938@pauillac.inria.fr> References: <20040131084640.GA12067@swordfish> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0i In-Reply-To: <20040131084640.GA12067@swordfish>; from mgushee@havenrock.com on Sat, Jan 31, 2004 at 01:46:40AM -0700 X-Loop: caml-list@inria.fr X-Spam: no; 0.00; caml-list:01 bug:01 bug:01 pervasives:01 bash-:01 2.05:01 3.07:01 creat:01 foo:01 val:01 abstr:01 baz:01 descriptor:01 flags:01 wronly:01 Sender: owner-caml-list@pauillac.inria.fr Precedence: bulk > I have encountered what appears to be a bug in out_channels created with > Pervasives.open_out_gen: > > bash-2.05a$ ocaml > Objective Caml version 3.07+2 > > # let oc = open_out_gen [Open_creat; Open_text] 0o644 "/var/tmp/foo";; > val oc : out_channel = > # output_string oc "Fubar Baz\n";; > - : unit = () > # close_out oc;; > Exception: Sys_error "Bad file descriptor". > > Well, that's disturbing. Or is there something I don't understand about > the proper usage of open_out_gen (documentation problem?)? In your call to open_out_gen, you didn't request write permission (the list of flags doesn't contain "Open_wronly"). So, attempts to write to the underlying file descriptor will fail. Since out_channels are buffered, the error isn't reported at the first output_string, but only when an actual OS write takes place, i.e. at close_out in your example. > BTW, I'm running OCaml on Debian GNU/Linux 3.0 (Woody), with glibc > 2.2.5. I installed OCaml 3.07pl2 from source, with no apparent > compilation errors. I am seeing the same problem on two similarly > configured systems. It is standard POSIX behavior. - Xavier Leroy ------------------- To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ Beginner's list: http://groups.yahoo.com/group/ocaml_beginners