[DragonFlyBSD - Bug #2965] (New) read(2), etc. return EAFNOSUPPORT after UDP disconnect

bugtracker-admin at leaf.dragonflybsd.org bugtracker-admin at leaf.dragonflybsd.org
Mon Nov 7 07:44:48 PST 2016

Issue #2965 has been reported by cmusser.

Bug #2965: read(2), etc. return EAFNOSUPPORT after UDP disconnect

* Author: cmusser
* Status: New
* Priority: Normal
* Assignee: 
* Category: Networking
* Target version: 
I ran into an unexpected return code from read(2)-like functions after unconnecting a connected UDP socket. 

>From what I've gleaned (from Stevens' "UNP", man pages, testing on other systems). unconnecting a connected UDP socket is done by passing a "null address" to connect(2). In response, it unconnects the socket and returns success (0) or EAFNOSUPPORT

On DragonFly, connect(2) returns success and unconnects the socket, but then the next read from the socket returns EAFNOSUPPORT. It seems as if EAFNOSUPPORT should come from `connect(2) instead. Neither read(2), recvfrom(2) or recvmsg(2) are documented as returning EAFNOSUPPORT.

I have a Github project at https://github.com/cmusser/udp_disconnect that demonstrates this behavior.

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