1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef __LINUX_NSFS_H
3 #define __LINUX_NSFS_H
4 
5 #include <linux/ioctl.h>
6 
7 #define NSIO	0xb7
8 
9 /* Returns a file descriptor that refers to an owning user namespace */
10 #define NS_GET_USERNS		_IO(NSIO, 0x1)
11 /* Returns a file descriptor that refers to a parent namespace */
12 #define NS_GET_PARENT		_IO(NSIO, 0x2)
13 /* Returns the type of namespace (CLONE_NEW* value) referred to by
14    file descriptor */
15 #define NS_GET_NSTYPE		_IO(NSIO, 0x3)
16 /* Get owner UID (in the caller's user namespace) for a user namespace */
17 #define NS_GET_OWNER_UID	_IO(NSIO, 0x4)
18 
19 #endif /* __LINUX_NSFS_H */
20