ntsync: Introduce NTSYNC_IOC_EVENT_READ.

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>
Link: https://lore.kernel.org/r/20241213193511.457338-15-zfigura@codeweavers.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
index 0047b13b6ebd4c0f8058e0712474504792925ec4..78dc405bb759063a9848b4ed96f3cb13b7a4fd44 100644 (file)
--- a/drivers/misc/ntsync.c
+++ b/drivers/misc/ntsync.c
@@ -629,6 +629,28 @@ 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_device *dev = event->dev;
+       struct ntsync_event_args args;
+       bool all;
+
+       if (event->type != NTSYNC_TYPE_EVENT)
+               return -EINVAL;
+
+       all = ntsync_lock_obj(dev, event);
+
+       args.manual = event->u.event.manual;
+       args.signaled = event->u.event.signaled;
+
+       ntsync_unlock_obj(dev, event, all);
+
+       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;
@@ -662,6 +684,8 @@ 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 207646e63ef3b0aca294b7ef003e5e17df5ab73f..b9d208a8c00fe9604e46eef2c13436ede06cfa9e 100644 (file)
--- 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