[Bug 295009] UDP receive with zero-size buffer immediately returns, no wait, no EAGAIN

[email protected] Thu, 21 May 2026 19:34:59 +0000

Newsgroups	gmane.os.freebsd.devel.net
Message-ID	<[email protected]/bugzilla/>

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295009

Gleb Smirnoff <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[email protected],
                   |                            |[email protected]

--- Comment #1 from Gleb Smirnoff <[email protected]> ---
Thanks for submission!

Probably the implementation uses a logic that with zero size receive buffer the
buffer was successfully filled with data, thus non-error return.  This case is
not explicitly covered neither by the specification not by the documentation. 
However, the case of "no data and non-blocking" is explicitly covered by
specification.

I tend to agree that the current behavior is not correct.  But it has been this
way for 40 years.  Thus, I would suggest to change it in FreeBSD 16.0 only.

-- 
You are receiving this mail because:
You are the assignee for the bug.