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433a97dd | 1 | /* $OpenBSD: atomicio.c,v 1.17 2006/04/01 05:51:34 djm Exp $ */ |
521b3913 | 2 | /* |
05624c18 | 3 | * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved. |
f3c7c613 | 4 | * Copyright (c) 1995,1999 Theo de Raadt. All rights reserved. |
521b3913 | 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 | #include "includes.h" | |
521b3913 | 29 | |
42f11eb2 | 30 | #include "atomicio.h" |
521b3913 | 31 | |
32 | /* | |
4899ccef | 33 | * ensure all of data on socket comes through. f==read || f==vwrite |
521b3913 | 34 | */ |
05624c18 | 35 | size_t |
433a97dd | 36 | atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n) |
521b3913 | 37 | { |
610cd5c6 | 38 | char *s = _s; |
05624c18 | 39 | size_t pos = 0; |
40 | ssize_t res; | |
521b3913 | 41 | |
42 | while (n > pos) { | |
35484284 | 43 | res = (f) (fd, s + pos, n - pos); |
521b3913 | 44 | switch (res) { |
45 | case -1: | |
b28e4a3b | 46 | #ifdef EWOULDBLOCK |
47 | if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK) | |
48 | #else | |
521b3913 | 49 | if (errno == EINTR || errno == EAGAIN) |
b28e4a3b | 50 | #endif |
521b3913 | 51 | continue; |
05624c18 | 52 | return 0; |
521b3913 | 53 | case 0: |
05624c18 | 54 | errno = EPIPE; |
55 | return pos; | |
521b3913 | 56 | default: |
cfb9181c | 57 | pos += (size_t)res; |
521b3913 | 58 | } |
59 | } | |
60 | return (pos); | |
61 | } |