This corresponds to the NT syscall NtQueryEvent().
This returns the signaled state of the event and whether it is manual-reset.
Signed-off-by: Elizabeth Figura zfigura@codeweavers.com --- drivers/misc/ntsync.c | 21 +++++++++++++++++++++ include/uapi/linux/ntsync.h | 1 + 2 files changed, 22 insertions(+)
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c index b07510035c1f..981a1545192c 100644 --- a/drivers/misc/ntsync.c +++ b/drivers/misc/ntsync.c @@ -568,6 +568,25 @@ static int ntsync_mutex_read(struct ntsync_obj *mutex, void __user *argp) return ret; }
+static int ntsync_event_read(struct ntsync_obj *event, void __user *argp) +{ + struct ntsync_event_args __user *user_args = argp; + struct ntsync_event_args args; + + if (event->type != NTSYNC_TYPE_EVENT) + return -EINVAL; + + args.event = 0; + spin_lock(&event->lock); + args.manual = event->u.event.manual; + args.signaled = event->u.event.signaled; + spin_unlock(&event->lock); + + if (copy_to_user(user_args, &args, sizeof(args))) + return -EFAULT; + return 0; +} + static int ntsync_obj_release(struct inode *inode, struct file *file) { struct ntsync_obj *obj = file->private_data; @@ -601,6 +620,8 @@ static long ntsync_obj_ioctl(struct file *file, unsigned int cmd, return ntsync_event_reset(obj, argp); case NTSYNC_IOC_EVENT_PULSE: return ntsync_event_set(obj, argp, true); + case NTSYNC_IOC_EVENT_READ: + return ntsync_event_read(obj, argp); default: return -ENOIOCTLCMD; } diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h index 25f3296cfabf..03c95e5a398f 100644 --- a/include/uapi/linux/ntsync.h +++ b/include/uapi/linux/ntsync.h @@ -53,5 +53,6 @@ struct ntsync_wait_args { #define NTSYNC_IOC_EVENT_PULSE _IOR ('N', 0x8a, __u32) #define NTSYNC_IOC_SEM_READ _IOR ('N', 0x8b, struct ntsync_sem_args) #define NTSYNC_IOC_MUTEX_READ _IOR ('N', 0x8c, struct ntsync_mutex_args) +#define NTSYNC_IOC_EVENT_READ _IOR ('N', 0x8d, struct ntsync_event_args)
#endif