From fa2056d2cc7cb53ebda9eec5d2fb91fc154a6c4f Mon Sep 17 00:00:00 2001
From: Drew DeVault <sir@cmpwn.com>
Date: Sat, 15 May 2021 21:10:27 -0400
Subject: [PATCH] io_uring::get_cqe: return null if unavailable

I'm not sure if we actually need to dinstinguish between null and EAGAIN
like liburing does, but I suspect not. In any case, this is sufficient
to implement a proof-of-concept for syscall-free I/O.

Signed-off-by: Drew DeVault <sir@cmpwn.com>

---
 io_uring/queue.ha | 3 +--

diff --git a/io_uring/queue.ha b/io_uring/queue.ha
index bb1989f5f377e71549abe1aebfecb671834ae4b3..1df8a71d816739eaadbc10ab995622a8400903d7 100644
--- a/io_uring/queue.ha
+++ b/io_uring/queue.ha
@@ -110,8 +110,7 @@ 		cq = tup.0;
 
 		if (cq == null && wait == 0 && submit == 0) {
 			if (!needs_flush(ring)) {
-				// TODO: EAGAIN
-				abort();
+				return null;
 			};
 			overflow = true;
 		};

-- 
2.48.1