From dca17223406f15a42fc363333847721f3647eac7 Mon Sep 17 00:00:00 2001
From: Andy Pan <i@andypan.me>
Date: Mon, 13 May 2024 07:29:00 +0800
Subject: [PATCH] Use kqueue as the backend of AE on DragonFlyBSD (#450)

Currently, we use select(2) on DragonFlyBSD while
`kqueue` is available on DragonFlyBSD since FreeBSD 4.1
and DragonFlyBSD was originally forked from FreeBSD 4.8

`select(2)` is a pretty old technique that has many defects
compared to `kqueue`, we should switch to `kqueue` on DragonFlyBSD.

Signed-off-by: Andy Pan <i@andypan.me>
---
 src/config.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/config.h b/src/config.h
index 2ff920a2a..a899ba8b9 100644
--- a/src/config.h
+++ b/src/config.h
@@ -115,7 +115,12 @@
 #define HAVE_PIPE2 1
 #endif
 
-#if (defined(__APPLE__) && defined(MAC_OS_10_6_DETECTED)) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined (__NetBSD__)
+/* Detect for kqueue */
+#if (defined(__APPLE__) && defined(MAC_OS_10_6_DETECTED)) || \
+    defined(__DragonFly__) || \
+    defined(__FreeBSD__) || \
+    defined(__OpenBSD__) || \
+    defined (__NetBSD__)
 #define HAVE_KQUEUE 1
 #endif