Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
ntsync: Introduce NTSYNC_IOC_MUTEX_READ.
This corresponds to the NT syscall NtQueryMutant().
This returns the recursion count, owner, and abandoned state of the mutex.
Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
Link: https://lore.kernel.org/r/20241213193511.457338-14-zfigura@codeweavers.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
authored by
Elizabeth Figura
and committed by
Greg Kroah-Hartman
0b3c3144
a948f417
+27
+26
drivers/misc/ntsync.c
+26
drivers/misc/ntsync.c
···
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return 0;
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}
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+
static int ntsync_mutex_read(struct ntsync_obj *mutex, void __user *argp)
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{
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struct ntsync_mutex_args __user *user_args = argp;
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struct ntsync_device *dev = mutex->dev;
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struct ntsync_mutex_args args;
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bool all;
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int ret;
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if (mutex->type != NTSYNC_TYPE_MUTEX)
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return -EINVAL;
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all = ntsync_lock_obj(dev, mutex);
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+
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args.count = mutex->u.mutex.count;
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args.owner = mutex->u.mutex.owner;
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ret = mutex->u.mutex.ownerdead ? -EOWNERDEAD : 0;
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ntsync_unlock_obj(dev, mutex, 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 ret;
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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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return ntsync_mutex_unlock(obj, argp);
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case NTSYNC_IOC_MUTEX_KILL:
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return ntsync_mutex_kill(obj, argp);
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+
case NTSYNC_IOC_MUTEX_READ:
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return ntsync_mutex_read(obj, argp);
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case NTSYNC_IOC_EVENT_SET:
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return ntsync_event_set(obj, argp, false);
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case NTSYNC_IOC_EVENT_RESET:
+1
include/uapi/linux/ntsync.h
+1
include/uapi/linux/ntsync.h