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

#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.h>

#ifdef __cplusplus
extern "C" {
#endif

/*
 * 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);

#ifdef __cplusplus
}
#endif

#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>
73ec1cf9	12	#include <common/macros.h>
33b14136	13
7966af57 SM	14	#ifdef __cplusplus
	15	extern "C" {
	16	#endif
	17
33b14136 MD	18	/*
	19	* lttng_read and lttng_write take care of EINTR and partial read/write.
	20	* Upon success, they return the "count" received as parameter.
	21	* They can return a negative value if an error occurs.
	22	* If a value lower than the requested "count" is returned, it means an
83f4233d	23	* error occurred.
33b14136 MD	24	* The error can be checked by querying errno.
	25	*/
	26	ssize_t lttng_read(int fd, void *buf, size_t count);
	27	ssize_t lttng_write(int fd, const void *buf, size_t count);
	28
7966af57 SM	29	#ifdef __cplusplus
	30	}
	31	#endif
	32
33b14136	33	#endif /* LTTNG_COMMON_READWRITE_H */