[lttng-tools.git] / include / lttng / userspace-probe-internal.h

/*
 * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
 * Copyright (C) 2018 - Francis Deslauriers <francis.deslauriers@efficios.com>
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License, version 2.1 only,
 * as published by the Free Software Foundation.
 *
 * This library 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef LTTNG_USERSPACE_PROBE_INTERNAL_H
#define LTTNG_USERSPACE_PROBE_INTERNAL_H

#include <lttng/userspace-probe.h>
#include <common/macros.h>
#include <common/dynamic-buffer.h>
#include <common/buffer-view.h>

/*
 * No elf-specific comm structure is defined since no elf-specific payload is
 * currently needed.
 */
struct lttng_userspace_probe_location_lookup_method_comm {
	/* enum lttng_userspace_probe_location_lookup_method_type */
	int8_t type;
	/* type-specific payload */
	char payload[];
};

/* Common ancestor of all userspace probe location lookup methods. */
struct lttng_userspace_probe_location_lookup_method {
	enum lttng_userspace_probe_location_lookup_method_type type;
};

struct lttng_userspace_probe_location_lookup_method_elf {
	struct lttng_userspace_probe_location_lookup_method parent;
};

struct lttng_userspace_probe_location_comm {
	/* enum lttng_userspace_probe_location_type */
	int8_t type;
	/*
	 * Payload is composed of, in that order,
	 *   - type-specific payload
	 *   - struct lttng_userspace_probe_location_lookup_method_comm
	 */
	char payload[];
};

struct lttng_userspace_probe_location_function_comm {
	/* Both lengths include the trailing \0. */
	uint32_t function_name_len;
	uint32_t binary_path_len;
	/*
	 * Payload is composed of, in that order,
	 *   - function name (with trailing \0),
	 *   - absolute binary path (with trailing \0)
	 */
	char payload[];
} LTTNG_PACKED;

/* Common ancestor of all userspace probe locations. */
struct lttng_userspace_probe_location {
	enum lttng_userspace_probe_location_type type;
	struct lttng_userspace_probe_location_lookup_method *lookup_method;
};

struct lttng_userspace_probe_location_function {
	struct lttng_userspace_probe_location parent;
	char *function_name;
	char *binary_path;
	/*
	 * binary_fd is a file descriptor to the executable file. It's open
	 * early on to keep the backing inode valid over the course of the
	 * intrumentation and use. It prevents deletion and reuse races.
	 * Set to -1 if not open.
	 */
	int binary_fd;
};

LTTNG_HIDDEN
int lttng_userspace_probe_location_serialize(
		const struct lttng_userspace_probe_location *location,
		struct lttng_dynamic_buffer *buffer,
		int *binary_fd);

LTTNG_HIDDEN
int lttng_userspace_probe_location_create_from_buffer(
		const struct lttng_buffer_view *buffer,
		struct lttng_userspace_probe_location **probe_location);

LTTNG_HIDDEN
int lttng_userspace_probe_location_function_set_binary_fd(
		struct lttng_userspace_probe_location *location, int binary_fd);

/*
 * Returns a version of the location that is serialized to a contiguous region
 * of memory. Pass NULL to buffer to only get the storage requirement of the
 * flattened userspace probe location.
 */
LTTNG_HIDDEN
int lttng_userspace_probe_location_flatten(
		const struct lttng_userspace_probe_location *location,
		struct lttng_dynamic_buffer *buffer);

#endif /* LTTNG_USERSPACE_PROBE_INTERNAL_H */
Commit	Line	Data
	1	/*
	2	* Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
	3	* Copyright (C) 2018 - Francis Deslauriers <francis.deslauriers@efficios.com>
	4	*
	5	* This library is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU Lesser General Public License, version 2.1 only,
	7	* as published by the Free Software Foundation.
	8	*
	9	* This library is distributed in the hope that it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
	12	* for more details.
	13	*
	14	* You should have received a copy of the GNU Lesser General Public License
	15	* along with this library; if not, write to the Free Software Foundation,
	16	* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	17	*/
	18
	19	#ifndef LTTNG_USERSPACE_PROBE_INTERNAL_H
	20	#define LTTNG_USERSPACE_PROBE_INTERNAL_H
	21
	22	#include <lttng/userspace-probe.h>
	23	#include <common/macros.h>
	24	#include <common/dynamic-buffer.h>
	25	#include <common/buffer-view.h>
	26
	27	/*
	28	* No elf-specific comm structure is defined since no elf-specific payload is
	29	* currently needed.
	30	*/
	31	struct lttng_userspace_probe_location_lookup_method_comm {
	32	/* enum lttng_userspace_probe_location_lookup_method_type */
	33	int8_t type;
	34	/* type-specific payload */
	35	char payload[];
	36	};
	37
	38	/* Common ancestor of all userspace probe location lookup methods. */
	39	struct lttng_userspace_probe_location_lookup_method {
	40	enum lttng_userspace_probe_location_lookup_method_type type;
	41	};
	42
	43	struct lttng_userspace_probe_location_lookup_method_elf {
	44	struct lttng_userspace_probe_location_lookup_method parent;
	45	};
	46
	47	struct lttng_userspace_probe_location_comm {
	48	/* enum lttng_userspace_probe_location_type */
	49	int8_t type;
	50	/*
	51	* Payload is composed of, in that order,
	52	* - type-specific payload
	53	* - struct lttng_userspace_probe_location_lookup_method_comm
	54	*/
	55	char payload[];
	56	};
	57
	58	struct lttng_userspace_probe_location_function_comm {
	59	/* Both lengths include the trailing \0. */
	60	uint32_t function_name_len;
	61	uint32_t binary_path_len;
	62	/*
	63	* Payload is composed of, in that order,
	64	* - function name (with trailing \0),
	65	* - absolute binary path (with trailing \0)
	66	*/
	67	char payload[];
	68	} LTTNG_PACKED;
	69
	70	/* Common ancestor of all userspace probe locations. */
	71	struct lttng_userspace_probe_location {
	72	enum lttng_userspace_probe_location_type type;
	73	struct lttng_userspace_probe_location_lookup_method *lookup_method;
	74	};
	75
	76	struct lttng_userspace_probe_location_function {
	77	struct lttng_userspace_probe_location parent;
	78	char *function_name;
	79	char *binary_path;
	80	/*
	81	* binary_fd is a file descriptor to the executable file. It's open
	82	* early on to keep the backing inode valid over the course of the
	83	* intrumentation and use. It prevents deletion and reuse races.
	84	* Set to -1 if not open.
	85	*/
	86	int binary_fd;
	87	};
	88
	89	LTTNG_HIDDEN
	90	int lttng_userspace_probe_location_serialize(
	91	const struct lttng_userspace_probe_location *location,
	92	struct lttng_dynamic_buffer *buffer,
	93	int *binary_fd);
	94
	95	LTTNG_HIDDEN
	96	int lttng_userspace_probe_location_create_from_buffer(
	97	const struct lttng_buffer_view *buffer,
	98	struct lttng_userspace_probe_location **probe_location);
	99
	100	LTTNG_HIDDEN
	101	int lttng_userspace_probe_location_function_set_binary_fd(
	102	struct lttng_userspace_probe_location *location, int binary_fd);
	103
	104	/*
	105	* Returns a version of the location that is serialized to a contiguous region
	106	* of memory. Pass NULL to buffer to only get the storage requirement of the
	107	* flattened userspace probe location.
	108	*/
	109	LTTNG_HIDDEN
	110	int lttng_userspace_probe_location_flatten(
	111	const struct lttng_userspace_probe_location *location,
	112	struct lttng_dynamic_buffer *buffer);
	113
	114	#endif /* LTTNG_USERSPACE_PROBE_INTERNAL_H */