This corresponds to the NT syscall NtQuerySemaphore().
This returns the current count and maximum count of the semaphore.
Signed-off-by: Elizabeth Figura <zfigura@xxxxxxxxxxxxxxx>
---
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 b0c1d644f0af..4c680a2b8353 100644
--- a/drivers/misc/ntsync.c
+++ b/drivers/misc/ntsync.c
@@ -583,6 +583,30 @@ static int ntsync_event_reset(struct ntsync_obj *event, void __user *argp)
return 0;
}
+static int ntsync_sem_read(struct ntsync_obj *sem, void __user *argp)
+{
+ struct ntsync_sem_args __user *user_args = argp;
+ struct ntsync_device *dev = sem->dev;
+ struct ntsync_sem_args args;
+ bool all;
+
+ if (sem->type != NTSYNC_TYPE_SEM)
+ return -EINVAL;
+
+ args.sem = 0;
+
+ all = ntsync_lock_obj(dev, sem);
+
+ args.count = sem->u.sem.count;
+ args.max = sem->u.sem.max;
+
+ ntsync_unlock_obj(dev, sem, 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;
@@ -602,6 +626,8 @@ static long ntsync_obj_ioctl(struct file *file, unsigned int cmd,
switch (cmd) {
case NTSYNC_IOC_SEM_POST:
return ntsync_sem_post(obj, argp);
+ case NTSYNC_IOC_SEM_READ:
+ return ntsync_sem_read(obj, argp);
case NTSYNC_IOC_MUTEX_UNLOCK:
return ntsync_mutex_unlock(obj, argp);
case NTSYNC_IOC_MUTEX_KILL:
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
index 5586fadd9bdd..5e922703686f 100644
--- a/include/uapi/linux/ntsync.h
+++ b/include/uapi/linux/ntsync.h
@@ -54,5 +54,6 @@ struct ntsync_wait_args {
#define NTSYNC_IOC_EVENT_SET _IOR ('N', 0x88, __u32)
#define NTSYNC_IOC_EVENT_RESET _IOR ('N', 0x89, __u32)
#define NTSYNC_IOC_EVENT_PULSE _IOR ('N', 0x8a, __u32)
+#define NTSYNC_IOC_SEM_READ _IOR ('N', 0x8b, struct ntsync_sem_args)
#endif
--
2.43.0
