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annotate atomicio.c @ 1661:6a6a0bac52f4

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author Matt Johnston <matt@ucc.asn.au>
date Sat, 14 Mar 2020 23:26:37 +0800
parents 83d85b28b353
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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Francois Perrad <francois.perrad@gadz.org>
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1 /* $OpenBSD: atomicio.c,v 1.17 2006/04/01 05:51:34 djm Exp $ */
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2 /*
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3 * Copied from OpenSSH/OpenBSD.
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4 *
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5 * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved.
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6 * Copyright (c) 1995,1999 Theo de Raadt. All rights reserved.
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7 * All rights reserved.
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8 *
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9 * Redistribution and use in source and binary forms, with or without
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10 * modification, are permitted provided that the following conditions
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11 * are met:
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12 * 1. Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 * 2. Redistributions in binary form must reproduce the above copyright
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15 * notice, this list of conditions and the following disclaimer in the
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16 * documentation and/or other materials provided with the distribution.
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17 *
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18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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28 */
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29
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30 #include "includes.h"
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32 #include "atomicio.h"
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33
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34 /*
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35 * ensure all of data on socket comes through. f==read || f==vwrite
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36 */
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37 size_t
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38 atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
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39 {
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40 char *s = _s;
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41 size_t pos = 0;
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42 ssize_t res;
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44 while (n > pos) {
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45 res = (f) (fd, s + pos, n - pos);
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46 switch (res) {
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47 case -1:
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48 if (errno == EINTR || errno == EAGAIN)
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49 continue;
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50 return 0;
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51 case 0:
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52 errno = EPIPE;
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53 return pos;
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54 default:
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55 pos += (size_t)res;
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56 }
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57 }
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58 return (pos);
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59 }