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[Mldonkey-bugs] [bugs #11384] Source of Orphaned File Descriptor Bug

From: Rand Childs
Subject: [Mldonkey-bugs] [bugs #11384] Source of Orphaned File Descriptor Bug
Date: Thu, 23 Dec 2004 10:58:02 -0500
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This mail is an automated notification from the bugs tracker
 of the project: mldonkey, a multi-networks file-sharing client.

[bugs #11384] Full Item Snapshot:

URL: <>
Project: mldonkey, a multi-networks file-sharing client
Submitted by: Rand Childs
On: Thu 12/23/2004 at 15:46

Category:  Core
Severity:  5 - Average
Item Group:  Program malfunction
Resolution:  None
Privacy:  Public
Assigned to:  None
Status:  Open
Release:  None
Release:  2.5-22
Platform Version:  Mac OS X Jaguar
Binaries Origin:  CVS / Self compiled
CPU type:  PowerPC

Summary:  Source of Orphaned File Descriptor Bug

Original Submission:  On Mac OS X and I assume other systems there are two bugs 
in mlnet which together generate hundreds of orphaned file descriptors causing 
mlnet to eventually hang.  I worked with mlnet 2.5-22 source and ocaml 3.07-p12 
to debug the source of the problem:

I don't know the source code or OCAML well enough to suggest exactly why it is 
happening or the best way to fix it, but I have done enough debugging to figure 
out the cause of the probem. There are two issues: 

1. The first is in src/daemon/common/ in the routine 
send_paquet_to_mlchat. The Unix.connect fails with "Connection refused : 
connect" but the error is not trapped and the socket is not closed. Trapping 
the error and closing the socket fixes this one. 

2. The rest of the orphaned file descriptors is in 
src/utils/net/ in the routine tcp_handler. The Unix.accept 
fails with Exception tcp_handler: failed: Address family not supported by 
protocol family" but apparently has created a new socket which is never closed. 
If I trap the exception and issue the following "close t (Closed_for_error 
(Printexc2.to_string e));" I find that lsof only shows one orphaned socket 
after hours of running. I assume that issuing "close t" closes the original 
socket that is being listened to and this stop this Unix.accept from being 
called again. I don't know why it is getting this error unless perhaps the 
previous bind failed and that wasn't trapped, but maybe there is some other 

So if a developer who knows the code and OCAML can fix these two problems and 
get the patches in the current release then that should solve the orhpaned file 
descriptor problem which causes mlnet to hang after running for some hours

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