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Damien Miller05ec5c61999-12-07 17:03:33 +11001/*
Damien Millere4340be2000-09-16 13:29:08 +11002 * Copyright (c) 1995,1999 Theo de Raadt
Damien Miller05ec5c61999-12-07 17:03:33 +11003 * 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"
Damien Millere4340be2000-09-16 13:29:08 +110027RCSID("$OpenBSD: atomicio.c,v 1.5 2000/09/07 20:27:49 deraadt Exp $");
Damien Miller05ec5c61999-12-07 17:03:33 +110028
29#include "xmalloc.h"
30#include "ssh.h"
31
32/*
33 * ensure all of data on socket comes through. f==read || f==write
34 */
Damien Miller98c7ad62000-03-09 21:27:49 +110035ssize_t
Damien Miller7684ee12000-03-17 23:40:15 +110036atomicio(f, fd, _s, n)
Damien Miller98c7ad62000-03-09 21:27:49 +110037 ssize_t (*f) ();
Damien Miller05ec5c61999-12-07 17:03:33 +110038 int fd;
Damien Miller7684ee12000-03-17 23:40:15 +110039 void *_s;
Damien Miller05ec5c61999-12-07 17:03:33 +110040 size_t n;
41{
Damien Miller7684ee12000-03-17 23:40:15 +110042 char *s = _s;
Damien Miller98c7ad62000-03-09 21:27:49 +110043 ssize_t res, pos = 0;
Damien Miller05ec5c61999-12-07 17:03:33 +110044
45 while (n > pos) {
Damien Miller5f056372000-04-16 12:31:48 +100046 res = (f) (fd, s + pos, n - pos);
Damien Miller05ec5c61999-12-07 17:03:33 +110047 switch (res) {
48 case -1:
Damien Millerf2fdbe52000-07-08 10:57:08 +100049#ifdef EWOULDBLOCK
50 if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)
51#else
Damien Miller05ec5c61999-12-07 17:03:33 +110052 if (errno == EINTR || errno == EAGAIN)
Damien Millerf2fdbe52000-07-08 10:57:08 +100053#endif
Damien Miller05ec5c61999-12-07 17:03:33 +110054 continue;
55 case 0:
56 return (res);
57 default:
58 pos += res;
59 }
60 }
61 return (pos);
62}