Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
ntsync: Introduce NTSYNC_IOC_SEM_READ.
This corresponds to the NT syscall NtQuerySemaphore().
This returns the current count and maximum count of the semaphore.
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
Link: https://lore.kernel.org/r/20241213193511.457338-13-zfigura@codeweavers.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
authored by
Elizabeth Figura
and committed by
Greg Kroah-Hartman
a948f417
12b29d30
+25
+24
drivers/misc/ntsync.c
+24
drivers/misc/ntsync.c
···
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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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if (sem->type != NTSYNC_TYPE_SEM)
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return -EINVAL;
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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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ntsync_unlock_obj(dev, sem, all);
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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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switch (cmd) {
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case NTSYNC_IOC_SEM_RELEASE:
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return ntsync_sem_release(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:
+1
include/uapi/linux/ntsync.h
+1
include/uapi/linux/ntsync.h