[lttng-ust.git] / src / common / ns.h

/*
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 * Copyright (C) 2019 Michael Jeanson <mjeanson@efficios.com>
 */

#ifndef _LTTNG_NS_H
#define _LTTNG_NS_H

/*
 * The lowest valid inode number that can be allocated in the proc filesystem
 * is 0xF0000000. Any number below can be used internally as an error code.
 *
 * Zero is used in the kernel as an error code, it's the value we will return
 * when we fail to read the proper inode number.
 *
 * One is used internally to identify an uninitialized cache entry, it should
 * never be returned.
 */

enum ns_ino_state {
	NS_INO_UNAVAILABLE	= 0x0,
	NS_INO_UNINITIALIZED	= 0x1,
	NS_INO_MIN		= 0xF0000000,
};

/*
 * The longest possible namespace proc path is with the cgroup ns
 * and the maximum theoretical linux pid of 536870912 :
 *
 *  /proc/self/task/536870912/ns/cgroup
 */
#define LTTNG_PROC_NS_PATH_MAX 40

#endif /* _LTTNG_NS_H */
Commit	Line	Data
735bef47	1	/*
c0c0989a	2	* SPDX-License-Identifier: LGPL-2.1-only
735bef47	3	*
c0c0989a	4	* Copyright (C) 2019 Michael Jeanson <mjeanson@efficios.com>
735bef47 MJ	5	*/
735bef47 MJ	6
c0c0989a MJ	7	#ifndef _LTTNG_NS_H
c0c0989a MJ	8	#define _LTTNG_NS_H
735bef47 MJ	9
	10	/*
	11	* The lowest valid inode number that can be allocated in the proc filesystem
	12	* is 0xF0000000. Any number below can be used internally as an error code.
	13	*
	14	* Zero is used in the kernel as an error code, it's the value we will return
	15	* when we fail to read the proper inode number.
	16	*
	17	* One is used internally to identify an uninitialized cache entry, it should
	18	* never be returned.
	19	*/
	20
	21	enum ns_ino_state {
	22	NS_INO_UNAVAILABLE = 0x0,
	23	NS_INO_UNINITIALIZED = 0x1,
	24	NS_INO_MIN = 0xF0000000,
	25	};
	26
c5e8ef85 MJ	27	/*
	28	* The longest possible namespace proc path is with the cgroup ns
	29	* and the maximum theoretical linux pid of 536870912 :
	30	*
	31	* /proc/self/task/536870912/ns/cgroup
	32	*/
	33	#define LTTNG_PROC_NS_PATH_MAX 40
	34
735bef47	35	#endif /* _LTTNG_NS_H */