[PATCH 10/31] ntsync: Introduce NTSYNC_IOC_EVENT_SET.

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(a)codeweavers.com> --- drivers/misc/ntsync.c | 37 +++++++++++++++++++++++++++++++++++++ include/uapi/linux/ntsync.h | 1 + 2 files changed, 38 insertions(+) diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c index 2a21e7b0982a..bc24de02fd1c 100644 --- a/drivers/misc/ntsync.c +++ b/drivers/misc/ntsync.c @@ -456,6 +456,41 @@ 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; + + if (event->type != NTSYNC_TYPE_EVENT) + return -EINVAL; + + if (atomic_read(&event->all_hint) > 0) { + spin_lock(&dev->wait_all_lock); + spin_lock_nest_lock(&event->lock, &dev->wait_all_lock); + + prev_state = event->u.event.signaled; + event->u.event.signaled = true; + try_wake_all_obj(dev, event); + try_wake_any_event(event); + + spin_unlock(&event->lock); + spin_unlock(&dev->wait_all_lock); + } else { + spin_lock(&event->lock); + + prev_state = event->u.event.signaled; + event->u.event.signaled = true; + try_wake_any_event(event); + + 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; @@ -479,6 +514,8 @@ 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 b8cf503365ef..782057552483 100644 --- a/include/uapi/linux/ntsync.h +++ b/include/uapi/linux/ntsync.h @@ -48,5 +48,6 @@ 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