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The C and C++ Include Header Files

cat -n /usr/include/linux/nsfs.h

     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	#include <linux/types.h>
     7	
     8	#define NSIO	0xb7
     9	
    10	/* Returns a file descriptor that refers to an owning user namespace */
    11	#define NS_GET_USERNS		_IO(NSIO, 0x1)
    12	/* Returns a file descriptor that refers to a parent namespace */
    13	#define NS_GET_PARENT		_IO(NSIO, 0x2)
    14	/* Returns the type of namespace (CLONE_NEW* value) referred to by
    15	   file descriptor */
    16	#define NS_GET_NSTYPE		_IO(NSIO, 0x3)
    17	/* Get owner UID (in the caller's user namespace) for a user namespace */
    18	#define NS_GET_OWNER_UID	_IO(NSIO, 0x4)
    19	/* Translate pid from target pid namespace into the caller's pid namespace. */
    20	#define NS_GET_PID_FROM_PIDNS	_IOR(NSIO, 0x6, int)
    21	/* Return thread-group leader id of pid in the callers pid namespace. */
    22	#define NS_GET_TGID_FROM_PIDNS	_IOR(NSIO, 0x7, int)
    23	/* Translate pid from caller's pid namespace into a target pid namespace. */
    24	#define NS_GET_PID_IN_PIDNS	_IOR(NSIO, 0x8, int)
    25	/* Return thread-group leader id of pid in the target pid namespace. */
    26	#define NS_GET_TGID_IN_PIDNS	_IOR(NSIO, 0x9, int)
    27	
    28	struct mnt_ns_info {
    29		__u32 size;
    30		__u32 nr_mounts;
    31		__u64 mnt_ns_id;
    32	};
    33	
    34	#define MNT_NS_INFO_SIZE_VER0 16 /* size of first published struct */
    35	
    36	/* Get information about namespace. */
    37	#define NS_MNT_GET_INFO		_IOR(NSIO, 10, struct mnt_ns_info)
    38	/* Get next namespace. */
    39	#define NS_MNT_GET_NEXT		_IOR(NSIO, 11, struct mnt_ns_info)
    40	/* Get previous namespace. */
    41	#define NS_MNT_GET_PREV		_IOR(NSIO, 12, struct mnt_ns_info)
    42	
    43	/* Retrieve namespace identifiers. */
    44	#define NS_GET_MNTNS_ID		_IOR(NSIO, 5,  __u64)
    45	#define NS_GET_ID		_IOR(NSIO, 13, __u64)
    46	
    47	enum init_ns_ino {
    48		IPC_NS_INIT_INO		= 0xEFFFFFFFU,
    49		UTS_NS_INIT_INO		= 0xEFFFFFFEU,
    50		USER_NS_INIT_INO	= 0xEFFFFFFDU,
    51		PID_NS_INIT_INO		= 0xEFFFFFFCU,
    52		CGROUP_NS_INIT_INO	= 0xEFFFFFFBU,
    53		TIME_NS_INIT_INO	= 0xEFFFFFFAU,
    54		NET_NS_INIT_INO		= 0xEFFFFFF9U,
    55		MNT_NS_INIT_INO		= 0xEFFFFFF8U,
    56	};
    57	
    58	struct nsfs_file_handle {
    59		__u64 ns_id;
    60		__u32 ns_type;
    61		__u32 ns_inum;
    62	};
    63	
    64	#define NSFS_FILE_HANDLE_SIZE_VER0 16 /* sizeof first published struct */
    65	#define NSFS_FILE_HANDLE_SIZE_LATEST sizeof(struct nsfs_file_handle) /* sizeof latest published struct */
    66	
    67	enum init_ns_id {
    68		IPC_NS_INIT_ID		= 1ULL,
    69		UTS_NS_INIT_ID		= 2ULL,
    70		USER_NS_INIT_ID		= 3ULL,
    71		PID_NS_INIT_ID		= 4ULL,
    72		CGROUP_NS_INIT_ID	= 5ULL,
    73		TIME_NS_INIT_ID		= 6ULL,
    74		NET_NS_INIT_ID		= 7ULL,
    75		MNT_NS_INIT_ID		= 8ULL,
    76	};
    77	
    78	enum ns_type {
    79		TIME_NS    = (1ULL << 7),  /* CLONE_NEWTIME */
    80		MNT_NS     = (1ULL << 17), /* CLONE_NEWNS */
    81		CGROUP_NS  = (1ULL << 25), /* CLONE_NEWCGROUP */
    82		UTS_NS     = (1ULL << 26), /* CLONE_NEWUTS */
    83		IPC_NS     = (1ULL << 27), /* CLONE_NEWIPC */
    84		USER_NS    = (1ULL << 28), /* CLONE_NEWUSER */
    85		PID_NS     = (1ULL << 29), /* CLONE_NEWPID */
    86		NET_NS     = (1ULL << 30), /* CLONE_NEWNET */
    87	};
    88	
    89	/**
    90	 * struct ns_id_req - namespace ID request structure
    91	 * @size: size of this structure
    92	 * @spare: reserved for future use
    93	 * @filter: filter mask
    94	 * @ns_id: last namespace id
    95	 * @user_ns_id: owning user namespace ID
    96	 *
    97	 * Structure for passing namespace ID and miscellaneous parameters to
    98	 * statns(2) and listns(2).
    99	 *
   100	 * For statns(2) @param represents the request mask.
   101	 * For listns(2) @param represents the last listed mount id (or zero).
   102	 */
   103	struct ns_id_req {
   104		__u32 size;
   105		__u32 spare;
   106		__u64 ns_id;
   107		struct /* listns */ {
   108			__u32 ns_type;
   109			__u32 spare2;
   110			__u64 user_ns_id;
   111		};
   112	};
   113	
   114	/*
   115	 * Special @user_ns_id value that can be passed to listns()
   116	 */
   117	#define LISTNS_CURRENT_USER 0xffffffffffffffff /* Caller's userns */
   118	
   119	/* List of all ns_id_req versions. */
   120	#define NS_ID_REQ_SIZE_VER0 32 /* sizeof first published struct */
   121	
   122	#endif /* __LINUX_NSFS_H */