From cc82ed28cce2339f8ce5d566c0ca19d0083bc5f1 Mon Sep 17 00:00:00 2001
From: Ian Douglas Scott <ian@iandouglasscott.com>
Date: Fri, 10 Nov 2023 09:08:44 -0800
Subject: [PATCH] Fix ioctl numbers on BSDs (#926)

`<sys/ioccom.h>` defines `IOC_OUT` as `0x40000000UL`. But this is "out"
from the perspective of the kernel, not the application. So this
corresponds to `READ` rather than `WRITE`.

Tested on FreeBSD with https://github.com/Smithay/drm-rs/pull/180. This also
seems to be correct for NetBSD and OpenBSD.
---
 src/ioctl/bsd.rs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/ioctl/bsd.rs b/src/ioctl/bsd.rs
index 66b75b54b..36e6f961f 100644
--- a/src/ioctl/bsd.rs
+++ b/src/ioctl/bsd.rs
@@ -18,7 +18,10 @@ pub(super) const fn compose_opcode(
     dir | num | (group << 8) | ((size & IOCPARAM_MASK) << 16)
 }
 
+// `IOC_VOID`
 pub const NONE: RawOpcode = 0x2000_0000;
-pub const WRITE: RawOpcode = 0x4000_0000;
-pub const READ: RawOpcode = 0x8000_0000;
+// `IOC_OUT` ("out" is from the perspective of the kernel)
+pub const READ: RawOpcode = 0x4000_0000;
+// `IOC_IN`
+pub const WRITE: RawOpcode = 0x8000_0000;
 pub const IOCPARAM_MASK: RawOpcode = 0x1FFF;