/usr/arm-linux-gnueabihf/include/linux/nsfs.h is in linux-libc-dev-armhf-cross 4.15.0-18.19cross1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef __LINUX_NSFS_H
#define __LINUX_NSFS_H
#include <linux/ioctl.h>
#define NSIO 0xb7
/* Returns a file descriptor that refers to an owning user namespace */
#define NS_GET_USERNS _IO(NSIO, 0x1)
/* Returns a file descriptor that refers to a parent namespace */
#define NS_GET_PARENT _IO(NSIO, 0x2)
/* Returns the type of namespace (CLONE_NEW* value) referred to by
file descriptor */
#define NS_GET_NSTYPE _IO(NSIO, 0x3)
/* Get owner UID (in the caller's user namespace) for a user namespace */
#define NS_GET_OWNER_UID _IO(NSIO, 0x4)
#endif /* __LINUX_NSFS_H */
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