winesync: Introduce WINESYNC_IOC_READ_EVENT.

Signed-off-by: Alexandre Frade <kernel@xanmod.org>
xanmod · Aug 2, 2022 · 69dbb25 · 69dbb25
1 parent 4f3ff01
commit 69dbb25
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Showing 2 changed files with 31 additions and 0 deletions.
diff --git a/drivers/misc/winesync.c b/drivers/misc/winesync.c
@@ -639,6 +639,33 @@ static int winesync_read_mutex(struct winesync_device *dev, void __user *argp)
 	return ret;
 }
 
+static int winesync_read_event(struct winesync_device *dev, void __user *argp)
+{
+	struct winesync_event_args __user *user_args = argp;
+	struct winesync_event_args args;
+	struct winesync_obj *event;
+	__u32 id;
+
+	if (get_user(id, &user_args->event))
+		return -EFAULT;
+
+	event = get_obj_typed(dev, id, WINESYNC_TYPE_EVENT);
+	if (!event)
+		return -EINVAL;
+
+	args.event = id;
+	spin_lock(&event->lock);
+	args.manual = event->u.event.manual;
+	args.signaled = event->u.event.signaled;
+	spin_unlock(&event->lock);
+
+	put_obj(event);
+
+	if (copy_to_user(user_args, &args, sizeof(args)))
+		return -EFAULT;
+	return 0;
+}
+
 /*
  * Actually change the mutex state to mark its owner as dead.
  */
@@ -1081,6 +1108,8 @@ static long winesync_char_ioctl(struct file *file, unsigned int cmd,
 		return winesync_put_mutex(dev, argp);
 	case WINESYNC_IOC_PUT_SEM:
 		return winesync_put_sem(dev, argp);
+	case WINESYNC_IOC_READ_EVENT:
+		return winesync_read_event(dev, argp);
 	case WINESYNC_IOC_READ_MUTEX:
 		return winesync_read_mutex(dev, argp);
 	case WINESYNC_IOC_READ_SEM:

diff --git a/include/uapi/linux/winesync.h b/include/uapi/linux/winesync.h
@@ -65,5 +65,7 @@ struct winesync_wait_args {
 					      struct winesync_event_args)
 #define WINESYNC_IOC_PULSE_EVENT	_IOWR(WINESYNC_IOC_BASE, 13, \
 					      struct winesync_event_args)
+#define WINESYNC_IOC_READ_EVENT		_IOWR(WINESYNC_IOC_BASE, 14, \
+					      struct winesync_event_args)
 
 #endif