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1/*
2 * Copyright (c) 1999 Theo de Raadt
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"
27RCSID("$Id: atomicio.c,v 1.7 1999/12/07 06:03:33 damien Exp $");
28
29#include "xmalloc.h"
30#include "ssh.h"
31
32/*
33 * ensure all of data on socket comes through. f==read || f==write
34 */
35int
36atomicio(f, fd, s, n)
37 int (*f) ();
38 int fd;
39 void *s;
40 size_t n;
41{
42 int res, pos = 0;
43
44 while (n > pos) {
45 res = (f) (fd, s + pos, n - pos);
46 switch (res) {
47 case -1:
48 if (errno == EINTR || errno == EAGAIN)
49 continue;
50 case 0:
51 return (res);
52 default:
53 pos += res;
54 }
55 }
56 return (pos);
57}