[lttng-tools.git] / src / common / readwrite.hpp

#ifndef LTTNG_COMMON_READWRITE_H
#define LTTNG_COMMON_READWRITE_H

/*
 * Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 */

#include <unistd.h>
#include <common/macros.hpp>

/*
 * lttng_read and lttng_write take care of EINTR and partial read/write.
 * Upon success, they return the "count" received as parameter.
 * They can return a negative value if an error occurs.
 * If a value lower than the requested "count" is returned, it means an
 * error occurred.
 * The error can be checked by querying errno.
 */
ssize_t lttng_read(int fd, void *buf, size_t count);
ssize_t lttng_write(int fd, const void *buf, size_t count);

#endif /* LTTNG_COMMON_READWRITE_H */
Commit	Line	Data
33b14136 MD	1	#ifndef LTTNG_COMMON_READWRITE_H
	2	#define LTTNG_COMMON_READWRITE_H
	3
	4	/*
ab5be9fa	5	* Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
33b14136	6	*
ab5be9fa	7	* SPDX-License-Identifier: LGPL-2.1-only
33b14136	8	*
33b14136 MD	9	*/
	10
	11	#include <unistd.h>
c9e313bc	12	#include <common/macros.hpp>
33b14136 MD	13
	14	/*
	15	* lttng_read and lttng_write take care of EINTR and partial read/write.
	16	* Upon success, they return the "count" received as parameter.
	17	* They can return a negative value if an error occurs.
	18	* If a value lower than the requested "count" is returned, it means an
83f4233d	19	* error occurred.
33b14136 MD	20	* The error can be checked by querying errno.
	21	*/
	22	ssize_t lttng_read(int fd, void *buf, size_t count);
	23	ssize_t lttng_write(int fd, const void *buf, size_t count);
	24
	25	#endif /* LTTNG_COMMON_READWRITE_H */