From cf742faa39a58a9b43b671c66097e6880459d4ae Mon Sep 17 00:00:00 2001
From: Baptiste Daroussin <bapt@FreeBSD.org>
Date: Wed, 6 Mar 2024 15:11:32 +0100
Subject: [PATCH] timerfd_create: accept CLOCK_UPTIME/CLOCK_BOOTTIME

This is a common use case when using timerfd_create to actually use
it with CLOCK_BOOTTIME on linux which is CLOCK_UPTIME for us.

Note that currently on freebsd CLOCK_BOOTTIME is CLOCK_UPTIME, but the
semantic is supposed to be different, this has to be fixed later.

Tested with the fnott notification software

Reviewed by:	des, imp
Differential Revision:	https://reviews.freebsd.org/D44253
---
 sys/kern/sys_timerfd.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/sys/kern/sys_timerfd.c b/sys/kern/sys_timerfd.c
index 30c3709e59a6..f74fb87bea75 100644
--- a/sys/kern/sys_timerfd.c
+++ b/sys/kern/sys_timerfd.c
@@ -26,6 +26,7 @@
  * SUCH DAMAGE.
  */
 
+#include <sys/_clock_id.h>
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/callout.h>
@@ -432,8 +433,18 @@ kern_timerfd_create(struct thread *td, int clockid, int flags)
 	AUDIT_ARG_VALUE(clockid);
 	AUDIT_ARG_FFLAGS(flags);
 
-	if (clockid != CLOCK_REALTIME && clockid != CLOCK_MONOTONIC)
+	switch (clockid) {
+	case CLOCK_REALTIME:
+		/* FALLTHROUGH */
+	case CLOCK_MONOTONIC:
+		/* FALLTHROUGH */
+	case CLOCK_UPTIME:
+		/* FALLTHROUGH */
+	case CLOCK_BOOTTIME:
+		break;
+	default:
 		return (EINVAL);
+	}
 	if ((flags & ~(TFD_CLOEXEC | TFD_NONBLOCK)) != 0)
 		return (EINVAL);