bug#62990: 30.0.50; UDP server closes connection upon receiving an empty packet

[Robert Pluim]

>>>>> On Wed, 26 Apr 2023 13:30:32 +0300, Eli Zaretskii <eliz@gnu.org> said:

    >> Cc: 62990@debbugs.gnu.org
    >> From: Robert Pluim <rpluim@gmail.com>
    >> Date: Wed, 26 Apr 2023 11:14:42 +0200
    >> 
    >> So allowing emacs to send 0-length UDP packets turned out to be not
    >> too hard. Patch for both below. Eli, is this OK for master? It does
    >> change 2 behaviours:
    >> 
    >> 1. Receiving a 0-length UDP packet will no longer cause an error
    >> 2. Calling (process-send-string proc "") now actually sends out a
    >> packet for a UDP process (an empty one).

    Eli> Do we want some variable to get back the old behavior, in case some
    Eli> application out there depends on that?

For which one? Does it help if I say that [1] is a security fix? 😜

I canʼt think of anything that would be negatively affected, but weʼve
all been wrong before.

    Eli> Otherwise, fine by me, thanks.

Vasilij, does the patch work for you?

Robert
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