Bug 1375

Summary:	UDP recvfrom() calls return ECONNREFUSED after sendto() calls
Product:	[Retired] Red Hat Linux	Reporter:	tfeller
Component:	kernel	Assignee:	David Lawrence <dkl>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	5.2
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	1999-03-08 19:00:16 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description tfeller 1999-03-01 04:30:24 UTC

After calling sentto() on an unconnected UDP socket
the next recvfrom() call made will return an error
with errno set to ECONNREFUSED.
This sort of an error from an unconnected UDP socket
makes no sense and it is not documented in the man pages.
I have a fairly simple C test program that demonstrates
this problem that I can make available upon request.  This
test program works fine on other unix platforms including
BSDI, SCO OpenServer, SCO UnixWare and DGUX.
I am seeing lots of confusion in the news groups about this
problem.

Comment 1 Bill Nottingham 1999-03-08 19:00:59 UTC

It's not a bug, it's a feature; it's returning the error
from the previous UDP call. See RFC1122, sect. 4.1.3.3.

If you want the BSD socket behavior, you need to set the
SO_BSDCOMPAT socket option.

------- Email Received From  "Thomas J. Feller" <tfeller> 03/08/99 17:39 -------

Comment 2 tfeller 1999-03-18 21:41:59 UTC

If is is a feature than it should be clearly documented in the man
pages.  Are you saying that I need to figure out how the function
calls work by inferring their behavior from RFCs?  If so which RFCs
apply to Red Hat Linux 5.2?