[lttng-tools.git] / src / common / compat / directory-handle.h

/*
 * Copyright (C) 2019 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef _COMPAT_DIRECTORY_HANDLE_H
#define _COMPAT_DIRECTORY_HANDLE_H

#include <common/macros.h>
#include <common/credentials.h>

/*
 * Some platforms, such as Solaris 10, do not support directory file descriptors
 * and their associated functions (*at(...)), which are defined in POSIX.2008.
 *
 * This wrapper provides a handle that is either a copy of a directory's path
 * or a directory file descriptors, depending on the platform's capabilities.
 */
#ifdef COMPAT_DIRFD
struct lttng_directory_handle {
	int dirfd;
};
#else
struct lttng_directory_handle {
	char *base_path;
};
#endif

/*
 * Initialize a directory handle to the provided path. Passing a NULL path
 * returns a handle to the current working directory. The working directory
 * is not sampled; it will be accessed at the time of use of the functions
 * of this API.
 *
 * An initialized directory handle must be finalized using
 * lttng_directory_handle_fini().
 */
LTTNG_HIDDEN
int lttng_directory_handle_init(struct lttng_directory_handle *handle,
		const char *path);

LTTNG_HIDDEN
int lttng_directory_handle_init_from_dirfd(
		struct lttng_directory_handle *handle, int dirfd);

/*
 * Copy a directory handle.
 */
LTTNG_HIDDEN
int lttng_directory_handle_copy(const struct lttng_directory_handle *handle,
		struct lttng_directory_handle *new_copy);

/*
 * Move a directory handle. The original directory handle may no longer be
 * used after this call. This call cannot fail; directly assign the
 * return value to the new directory handle.
 *
 * It is safe (but unnecessary) to call lttng_directory_handle_fini on the
 * original handle.
 */
LTTNG_HIDDEN
struct lttng_directory_handle
lttng_directory_handle_move(struct lttng_directory_handle *original);

/*
 * Release the resources of a directory handle.
 */
LTTNG_HIDDEN
void lttng_directory_handle_fini(struct lttng_directory_handle *handle);

/*
 * Create a subdirectory relative to a directory handle.
 */
LTTNG_HIDDEN
int lttng_directory_handle_create_subdirectory(
		const struct lttng_directory_handle *handle,
		const char *subdirectory,
		mode_t mode);

/*
 * Create a subdirectory relative to a directory handle
 * as a given user.
 */
LTTNG_HIDDEN
int lttng_directory_handle_create_subdirectory_as_user(
		const struct lttng_directory_handle *handle,
		const char *subdirectory,
		mode_t mode, const struct lttng_credentials *creds);

/*
 * Recursively create a directory relative to a directory handle.
 */
LTTNG_HIDDEN
int lttng_directory_handle_create_subdirectory_recursive(
		const struct lttng_directory_handle *handle,
		const char *subdirectory_path,
		mode_t mode);

/*
 * Recursively create a directory relative to a directory handle
 * as a given user.
 */
LTTNG_HIDDEN
int lttng_directory_handle_create_subdirectory_recursive_as_user(
		const struct lttng_directory_handle *handle,
		const char *subdirectory_path,
		mode_t mode, const struct lttng_credentials *creds);

#endif /* _COMPAT_PATH_HANDLE_H */
Commit	Line	Data
	1	/*
	2	* Copyright (C) 2019 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License, version 2 only,
	6	* as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along
	14	* with this program; if not, write to the Free Software Foundation, Inc.,
	15	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	16	*/
	17
	18	#ifndef _COMPAT_DIRECTORY_HANDLE_H
	19	#define _COMPAT_DIRECTORY_HANDLE_H
	20
	21	#include <common/macros.h>
	22	#include <common/credentials.h>
	23
	24	/*
	25	* Some platforms, such as Solaris 10, do not support directory file descriptors
	26	* and their associated functions (*at(...)), which are defined in POSIX.2008.
	27	*
	28	* This wrapper provides a handle that is either a copy of a directory's path
	29	* or a directory file descriptors, depending on the platform's capabilities.
	30	*/
	31	#ifdef COMPAT_DIRFD
	32	struct lttng_directory_handle {
	33	int dirfd;
	34	};
	35	#else
	36	struct lttng_directory_handle {
	37	char *base_path;
	38	};
	39	#endif
	40
	41	/*
	42	* Initialize a directory handle to the provided path. Passing a NULL path
	43	* returns a handle to the current working directory. The working directory
	44	* is not sampled; it will be accessed at the time of use of the functions
	45	* of this API.
	46	*
	47	* An initialized directory handle must be finalized using
	48	* lttng_directory_handle_fini().
	49	*/
	50	LTTNG_HIDDEN
	51	int lttng_directory_handle_init(struct lttng_directory_handle *handle,
	52	const char *path);
	53
	54	LTTNG_HIDDEN
	55	int lttng_directory_handle_init_from_dirfd(
	56	struct lttng_directory_handle *handle, int dirfd);
	57
	58	/*
	59	* Copy a directory handle.
	60	*/
	61	LTTNG_HIDDEN
	62	int lttng_directory_handle_copy(const struct lttng_directory_handle *handle,
	63	struct lttng_directory_handle *new_copy);
	64
	65	/*
	66	* Move a directory handle. The original directory handle may no longer be
	67	* used after this call. This call cannot fail; directly assign the
	68	* return value to the new directory handle.
	69	*
	70	* It is safe (but unnecessary) to call lttng_directory_handle_fini on the
	71	* original handle.
	72	*/
	73	LTTNG_HIDDEN
	74	struct lttng_directory_handle
	75	lttng_directory_handle_move(struct lttng_directory_handle *original);
	76
	77	/*
	78	* Release the resources of a directory handle.
	79	*/
	80	LTTNG_HIDDEN
	81	void lttng_directory_handle_fini(struct lttng_directory_handle *handle);
	82
	83	/*
	84	* Create a subdirectory relative to a directory handle.
	85	*/
	86	LTTNG_HIDDEN
	87	int lttng_directory_handle_create_subdirectory(
	88	const struct lttng_directory_handle *handle,
	89	const char *subdirectory,
	90	mode_t mode);
	91
	92	/*
	93	* Create a subdirectory relative to a directory handle
	94	* as a given user.
	95	*/
	96	LTTNG_HIDDEN
	97	int lttng_directory_handle_create_subdirectory_as_user(
	98	const struct lttng_directory_handle *handle,
	99	const char *subdirectory,
	100	mode_t mode, const struct lttng_credentials *creds);
	101
	102	/*
	103	* Recursively create a directory relative to a directory handle.
	104	*/
	105	LTTNG_HIDDEN
	106	int lttng_directory_handle_create_subdirectory_recursive(
	107	const struct lttng_directory_handle *handle,
	108	const char *subdirectory_path,
	109	mode_t mode);
	110
	111	/*
	112	* Recursively create a directory relative to a directory handle
	113	* as a given user.
	114	*/
	115	LTTNG_HIDDEN
	116	int lttng_directory_handle_create_subdirectory_recursive_as_user(
	117	const struct lttng_directory_handle *handle,
	118	const char *subdirectory_path,
	119	mode_t mode, const struct lttng_credentials *creds);
	120
	121	#endif /* _COMPAT_PATH_HANDLE_H */