kern/146845: [libc] close(2) returns error 54 (connection reset by peer) wrongly

[Mikolaj Golub]

The following reply was made to PR kern/146845; it has been noted by GNATS.

From: Mikolaj Golub <to.my.trociny at gmail.com>
To: freebsd-net at FreeBSD.org
Cc: "Lavrentiev\, Anton \(NIH\/NLM\/NCBI\) \[C\]" <lavr at ncbi.nlm.nih.gov>,  "Robert N. M. Watson" <rwatson at FreeBSD.org>, bug-followup at FreeBSD.org
Subject: Re: kern/146845: [libc] close(2) returns error 54 (connection reset by peer) wrongly
Date: Sun, 30 May 2010 11:05:45 +0300

 --=-=-=
 
 On Fri, 28 May 2010 04:40:03 GMT Lavrentiev, Anton (NIH/NLM/NCBI) [C] wrote:
 
  >  IMHO, it is not, unfortunately, a solution:  it seems to clear ECONNRESET
  >  blindly and w/o distinguishing the situation when the remote end closes the
  >  connection prematurely (i.e. before acknowledging all data written from the
  >  local end) -- and that qualifies for the true "connection reset by peer"
  >  from close()...
 
 I did some experiments the results I would like to share here. The idea is
 following: the client sends data in one write() more then a win, while the
 server closes the connection without reading (sending RST on close). I also
 played with LINGER option. I have managed to get ECONNRESET only on write(),
 if the server sends RST before the client calls write(). In all other cases
 write()/close() returned without error. See the attachment for details. 
 
 So I think that with the workaround (ignore ECONNRESET returned by
 sodisconnect() in soclose()) we would not make the situation worse (while it
 fixed the issue with applications getting unexpectedly ECONNRESET after
 shutdown()/close() sequence).
 
 -- 
 Mikolaj Golub
 
 
 --=-=-=
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