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ntsync: Introduce NTSYNC_IOC_EVENT_READ.

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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>
This commit is contained in:
Elizabeth Figura 2024-12-13 13:34:55 -06:00 • committed by Greg Kroah-Hartman
parent 0b3c31449d
commit e864071a63
2 changed files with 25 additions and 0 deletions
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24
drivers/misc/ntsync.c
View file

@ -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;
}

1
include/uapi/linux/ntsync.h
View file

@ -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