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    Subject[PATCH 11/31] ntsync: Introduce NTSYNC_IOC_EVENT_RESET.
    Date
    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 bc24de02fd1c..57d78b086241 100644
    --- a/drivers/misc/ntsync.c
    +++ b/drivers/misc/ntsync.c
    @@ -491,6 +491,26 @@ 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;
    @@ -516,6 +536,8 @@ 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 782057552483..f2d7507d8438 100644
    --- a/include/uapi/linux/ntsync.h
    +++ b/include/uapi/linux/ntsync.h
    @@ -49,5 +49,6 @@ 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
    --
    2.43.0

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