1/*
2 * Copied from OpenSSH 3.6.1p2.
3 *
4 * Copyright (c) 1995,1999 Theo de Raadt.  All rights reserved.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28/* RCSID("OpenBSD: atomicio.c,v 1.10 2001/05/08 22:48:07 markus Exp "); */
29
30#include "atomicio.h"
31
32/*
33 * ensure all of data on socket comes through. f==read || f==write
34 */
35ssize_t
36atomicio(f, fd, _s, n)
37	ssize_t (*f) ();
38	int fd;
39	void *_s;
40	size_t n;
41{
42	char *s = _s;
43	ssize_t res;
44	size_t pos = 0;
45
46	while (n > pos) {
47		res = (f) (fd, s + pos, n - pos);
48		switch (res) {
49		case -1:
50#ifdef EWOULDBLOCK
51			if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)
52#else
53			if (errno == EINTR || errno == EAGAIN)
54#endif
55				continue;
56		case 0:
57			return (res);
58		default:
59			pos += res;
60		}
61	}
62	return (pos);
63}
64