# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1638784754 -3600
# Node ID 9dc36fdbdba19e64eb2288aae65e0b48cfd536f0
# Parent  f995d62044fab5c6af4d784f11c06562d3f8cbda
net.server_epoll: Ensure calls to :write() return something

With opportunistic writes enabled, writes can return what :onwritable()
returns, thus :onwritable() should return something sensible at each
spot.

Should prevent whatever caused
> Error writing to connection: (nil)
Tho this was probably harmless

diff -r f995d62044fa -r 9dc36fdbdba1 net/server_epoll.lua
--- a/net/server_epoll.lua	Sun Dec 05 14:49:06 2021 +0100
+++ b/net/server_epoll.lua	Mon Dec 06 10:59:14 2021 +0100
@@ -489,7 +489,7 @@
 function interface:onwritable()
 	self._writing = true; -- prevent reentrant writes etc
 	self:onconnect();
-	if not self.conn then return; end -- could have been closed in onconnect
+	if not self.conn then return nil, "no-conn"; end -- could have been closed in onconnect
 	self:on("predrain");
 	local buffer = self.writebuffer;
 	local data = buffer or "";
@@ -542,6 +542,7 @@
 		self:destroy();
 		return ok, err;
 	end
+	return true, err;
 end
 
 -- The write buffer has been successfully emptied