sortix--sortix/libc/include/ioleast.h

/*
 * Copyright (c) 2012, 2013 Jonas 'Sortie' Termansen.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * ioleast.h
 * Versions of {,p}{read,write} that don't return until it has returned as much
 * data as requested, end of file, or an error occurs. This is sometimes needed
 * as read(2) and write(2) is not always guaranteed to fill up the entire
 * buffer or write it all.
 */

#ifndef INCLUDE_IOLEAST_H
#define INCLUDE_IOLEAST_H

#include <sys/cdefs.h>

#include <sys/__/types.h>

#ifdef __cplusplus
extern "C" {
#endif

#ifndef __off_t_defined
#define __off_t_defined
typedef __off_t off_t;
#endif

#ifndef __size_t_defined
#define __size_t_defined
#define __need_size_t
#include <stddef.h>
#endif

size_t preadall(int fd, void* buf, size_t count, off_t off);
size_t preadleast(int fd, void* buf, size_t least, size_t max, off_t off);
size_t pwriteall(int fd, const void* buf, size_t count, off_t off);
size_t pwriteleast(int fd, const void* buf, size_t least, size_t max, off_t off);
size_t readall(int fd, void* buf, size_t count);
size_t readleast(int fd, void* buf, size_t least, size_t max);
size_t writeall(int fd, const void* buf, size_t count);
size_t writeleast(int fd, const void* buf, size_t least, size_t max);

#ifdef __cplusplus
} /* extern "C" */
#endif

#endif