[PATCH v6 12/28] ntsync: Introduce NTSYNC_IOC_EVENT_READ.
From: Elizabeth Figura <zfigura@codeweavers.com>
Date: 2024-12-09 19:02:48
Also in:
linux-doc, linux-kselftest, lkml
Subsystem:
char and misc drivers, ntsync synchronization primitive driver, the rest · Maintainers:
Arnd Bergmann, Greg Kroah-Hartman, Elizabeth Figura, Linus Torvalds
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 | 26 ++++++++++++++++++++++++++ include/uapi/linux/ntsync.h | 1 + 2 files changed, 27 insertions(+)
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
index cff2627c1efe..5a5ee7b6ee92 100644
--- a/drivers/misc/ntsync.c
+++ b/drivers/misc/ntsync.c@@ -633,6 +633,30 @@ 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; + + args.event = 0; + + 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;
@@ -666,6 +690,8 @@ 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 eced73d08783..74abeba832f7 100644
--- a/include/uapi/linux/ntsync.h
+++ b/include/uapi/linux/ntsync.h@@ -56,5 +56,6 @@ 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
--
2.45.2