From 9fabae2a28d6579de6d13dfc46c75f5df8a67335 Mon Sep 17 00:00:00 2001
From: Joran Dirk Greef <joran@ronomon.com>
Date: Sat, 19 Sep 2020 16:47:05 +0200
Subject: [PATCH] Return error.UnsupportedKernel for ENOSYS

---
 lib/std/os/linux/io_uring.zig | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/std/os/linux/io_uring.zig b/lib/std/os/linux/io_uring.zig
index 6f6c254b38..1e0f9fe183 100644
--- a/lib/std/os/linux/io_uring.zig
+++ b/lib/std/os/linux/io_uring.zig
@@ -623,7 +623,10 @@ pub const CompletionQueue = struct {
 
 inline fn check_errno(res: usize) !void {
     const errno = linux.getErrno(res);
-    if (errno != 0) return os.unexpectedErrno(errno);
+    if (errno != 0) {
+        if (errno == linux.ENOSYS) return error.UnsupportedKernel;
+        return os.unexpectedErrno(errno);
+    }
 }
 
 test "queue_nop" {