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1 | /* | |
2 | * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved. | |
3 | * Copyright (c) 1995,1999 Theo de Raadt. All rights reserved. | |
4 | * All rights reserved. | |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * | |
15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
25 | */ | |
26 | ||
27 | #include "includes.h" | |
28 | RCSID("$OpenBSD: atomicio.c,v 1.13 2005/05/24 17:32:43 avsm Exp $"); | |
29 | ||
30 | #include "atomicio.h" | |
31 | ||
32 | /* | |
33 | * ensure all of data on socket comes through. f==read || f==vwrite | |
34 | */ | |
35 | size_t | |
36 | atomicio(f, fd, _s, n) | |
37 | ssize_t (*f) (int, void *, size_t); | |
38 | int fd; | |
39 | void *_s; | |
40 | size_t n; | |
41 | { | |
42 | char *s = _s; | |
43 | size_t pos = 0; | |
44 | ssize_t res; | |
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 | return 0; | |
57 | case 0: | |
58 | errno = EPIPE; | |
59 | return pos; | |
60 | default: | |
61 | pos += (u_int)res; | |
62 | } | |
63 | } | |
64 | return (pos); | |
65 | } |