This corresponds to the NT syscall NtSetEvent().
This sets the event to the signaled state, and returns its previous state.
Signed-off-by: Elizabeth Figura <zfigura@xxxxxxxxxxxxxxx>
---
drivers/misc/ntsync.c | 27 +++++++++++++++++++++++++++
include/uapi/linux/ntsync.h | 1 +
2 files changed, 28 insertions(+)
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
index 2bce03187c17..97d9b6047fbe 100644
--- a/drivers/misc/ntsync.c
+++ b/drivers/misc/ntsync.c
@@ -534,6 +534,31 @@ static int ntsync_mutex_kill(struct ntsync_obj *mutex, void __user *argp)
return ret;
}
+static int ntsync_event_set(struct ntsync_obj *event, void __user *argp)
+{
+ struct ntsync_device *dev = event->dev;
+ __u32 prev_state;
+ bool all;
+
+ if (event->type != NTSYNC_TYPE_EVENT)
+ return -EINVAL;
+
+ all = ntsync_lock_obj(dev, event);
+
+ prev_state = event->u.event.signaled;
+ event->u.event.signaled = true;
+ if (all)
+ try_wake_all_obj(dev, event);
+ try_wake_any_event(event);
+
+ ntsync_unlock_obj(dev, event, all);
+
+ if (put_user(prev_state, (__u32 __user *)argp))
+ return -EFAULT;
+
+ return 0;
+}
+
static int ntsync_obj_release(struct inode *inode, struct file *file)
{
struct ntsync_obj *obj = file->private_data;
@@ -557,6 +582,8 @@ static long ntsync_obj_ioctl(struct file *file, unsigned int cmd,
return ntsync_mutex_unlock(obj, argp);
case NTSYNC_IOC_MUTEX_KILL:
return ntsync_mutex_kill(obj, argp);
+ case NTSYNC_IOC_EVENT_SET:
+ return ntsync_event_set(obj, argp);
default:
return -ENOIOCTLCMD;
}
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
index 4c0c4271c7de..36d903521bbe 100644
--- a/include/uapi/linux/ntsync.h
+++ b/include/uapi/linux/ntsync.h
@@ -51,5 +51,6 @@ struct ntsync_wait_args {
#define NTSYNC_IOC_SEM_POST _IOWR('N', 0x81, __u32)
#define NTSYNC_IOC_MUTEX_UNLOCK _IOWR('N', 0x85, struct ntsync_mutex_args)
#define NTSYNC_IOC_MUTEX_KILL _IOW ('N', 0x86, __u32)
+#define NTSYNC_IOC_EVENT_SET _IOR ('N', 0x88, __u32)
#endif
--
2.43.0
