67 lines
1.9 KiB
Diff
67 lines
1.9 KiB
Diff
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From 1ef0ea672662bd19e7c6a4eac1067d11e50844b2 Mon Sep 17 00:00:00 2001
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From: Elizabeth Figura <zfigura@codeweavers.com>
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Date: Sun, 19 May 2024 15:24:36 -0500
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Subject: ntsync: Introduce NTSYNC_IOC_SEM_READ.
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This corresponds to the NT syscall NtQuerySemaphore().
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This returns the current count and maximum count of the semaphore.
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Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
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---
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drivers/misc/ntsync.c | 26 ++++++++++++++++++++++++++
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include/uapi/linux/ntsync.h | 1 +
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2 files changed, 27 insertions(+)
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--- a/drivers/misc/ntsync.c
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+++ b/drivers/misc/ntsync.c
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@@ -583,6 +583,30 @@ static int ntsync_event_reset(struct nts
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return 0;
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}
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+static int ntsync_sem_read(struct ntsync_obj *sem, void __user *argp)
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+{
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+ struct ntsync_sem_args __user *user_args = argp;
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+ struct ntsync_device *dev = sem->dev;
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+ struct ntsync_sem_args args;
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+ bool all;
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+
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+ if (sem->type != NTSYNC_TYPE_SEM)
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+ return -EINVAL;
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+
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+ args.sem = 0;
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+
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+ all = ntsync_lock_obj(dev, sem);
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+
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+ args.count = sem->u.sem.count;
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+ args.max = sem->u.sem.max;
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+
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+ ntsync_unlock_obj(dev, sem, all);
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+
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+ if (copy_to_user(user_args, &args, sizeof(args)))
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+ return -EFAULT;
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+ return 0;
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+}
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+
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static int ntsync_obj_release(struct inode *inode, struct file *file)
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{
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struct ntsync_obj *obj = file->private_data;
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@@ -602,6 +626,8 @@ static long ntsync_obj_ioctl(struct file
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switch (cmd) {
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case NTSYNC_IOC_SEM_POST:
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return ntsync_sem_post(obj, argp);
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+ case NTSYNC_IOC_SEM_READ:
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+ return ntsync_sem_read(obj, argp);
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case NTSYNC_IOC_MUTEX_UNLOCK:
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return ntsync_mutex_unlock(obj, argp);
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case NTSYNC_IOC_MUTEX_KILL:
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--- a/include/uapi/linux/ntsync.h
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+++ b/include/uapi/linux/ntsync.h
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@@ -54,5 +54,6 @@ struct ntsync_wait_args {
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#define NTSYNC_IOC_EVENT_SET _IOR ('N', 0x88, __u32)
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#define NTSYNC_IOC_EVENT_RESET _IOR ('N', 0x89, __u32)
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#define NTSYNC_IOC_EVENT_PULSE _IOR ('N', 0x8a, __u32)
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+#define NTSYNC_IOC_SEM_READ _IOR ('N', 0x8b, struct ntsync_sem_args)
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#endif
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