[gssapi-openssh.git] / openssh / atomicio.c

/*
 * Copyright (c) 1995,1999 Theo de Raadt.  All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "includes.h"
RCSID("$OpenBSD: atomicio.c,v 1.12 2003/07/31 15:50:16 avsm Exp $");

#include "atomicio.h"

/*
 * ensure all of data on socket comes through. f==read || f==vwrite
 */
ssize_t
atomicio(f, fd, _s, n)
	ssize_t (*f) (int, void *, size_t);
	int fd;
	void *_s;
	size_t n;
{
	char *s = _s;
	ssize_t res, pos = 0;

	while (n > pos) {
		res = (f) (fd, s + pos, n - pos);
		switch (res) {
		case -1:
#ifdef EWOULDBLOCK
			if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)
#else
			if (errno == EINTR || errno == EAGAIN)
#endif
				continue;
		case 0:
			return (res);
		default:
			pos += res;
		}
	}
	return (pos);
}
Commit	Line	Data
3c0ef626	1	/*
	2	* Copyright (c) 1995,1999 Theo de Raadt. All rights reserved.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	*
	14	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	15	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	16	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	17	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	18	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	19	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	20	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	21	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	22	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	23	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	24	*/
	25
	26	#include "includes.h"
0fff78ff	27	RCSID("$OpenBSD: atomicio.c,v 1.12 2003/07/31 15:50:16 avsm Exp $");
3c0ef626	28
	29	#include "atomicio.h"
	30
	31	/*
0fff78ff	32	* ensure all of data on socket comes through. f==read \|\| f==vwrite
3c0ef626	33	*/
	34	ssize_t
	35	atomicio(f, fd, _s, n)
0fff78ff	36	ssize_t (f) (int, void , size_t);
3c0ef626	37	int fd;
	38	void *_s;
	39	size_t n;
	40	{
	41	char *s = _s;
	42	ssize_t res, pos = 0;
	43
	44	while (n > pos) {
	45	res = (f) (fd, s + pos, n - pos);
	46	switch (res) {
	47	case -1:
	48	#ifdef EWOULDBLOCK
	49	if (errno == EINTR \|\| errno == EAGAIN \|\| errno == EWOULDBLOCK)
	50	#else
	51	if (errno == EINTR \|\| errno == EAGAIN)
	52	#endif
	53	continue;
	54	case 0:
	55	return (res);
	56	default:
	57	pos += res;
	58	}
	59	}
	60	return (pos);
	61	}