This corresponds to the NT syscall NtResetEvent().
This sets the event to the unsignaled state, and returns its previous state.
Signed-off-by: Elizabeth Figura zfigura@codeweavers.com --- drivers/misc/ntsync.c | 22 ++++++++++++++++++++++ include/uapi/linux/ntsync.h | 1 + 2 files changed, 23 insertions(+)
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c index 69f359241cf6..ae78425c87d1 100644 --- a/drivers/misc/ntsync.c +++ b/drivers/misc/ntsync.c @@ -508,6 +508,26 @@ static int ntsync_event_set(struct ntsync_obj *event, void __user *argp) return 0; }
+static int ntsync_event_reset(struct ntsync_obj *event, void __user *argp) +{ + __u32 prev_state; + + if (event->type != NTSYNC_TYPE_EVENT) + return -EINVAL; + + spin_lock(&event->lock); + + prev_state = event->u.event.signaled; + event->u.event.signaled = false; + + spin_unlock(&event->lock); + + 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; @@ -533,6 +553,8 @@ static long ntsync_obj_ioctl(struct file *file, unsigned int cmd, return ntsync_mutex_kill(obj, argp); case NTSYNC_IOC_EVENT_SET: return ntsync_event_set(obj, argp); + case NTSYNC_IOC_EVENT_RESET: + return ntsync_event_reset(obj, argp); default: return -ENOIOCTLCMD; } diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h index 65329d15a472..657542107328 100644 --- a/include/uapi/linux/ntsync.h +++ b/include/uapi/linux/ntsync.h @@ -53,5 +53,6 @@ struct ntsync_wait_args { #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) +#define NTSYNC_IOC_EVENT_RESET _IOR ('N', 0x89, __u32)
#endif