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annotate atomicio.c @ 1060:4c733310c21d nocircbuffer

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reword comment for clarity
author Matt Johnston <matt@ucc.asn.au>
date Sun, 01 Mar 2015 23:26:42 +0800
parents 1bb50993acf1
children 968be6f7cff6
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1 /*
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2 * Copied from OpenSSH 3.6.1p2.
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3 *
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4 * Copyright (c) 1995,1999 Theo de Raadt. All rights reserved.
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5 * All rights reserved.
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6 *
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7 * Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following conditions
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9 * are met:
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10 * 1. Redistributions of source code must retain the above copyright
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11 * notice, this list of conditions and the following disclaimer.
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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26 */
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27
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28 /* RCSID("OpenBSD: atomicio.c,v 1.10 2001/05/08 22:48:07 markus Exp "); */
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30 #include "atomicio.h"
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32 /*
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33 * ensure all of data on socket comes through. f==read || f==write
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34 */
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35 ssize_t
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36 atomicio(f, fd, _s, n)
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37 ssize_t (*f) ();
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38 int fd;
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39 void *_s;
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40 size_t n;
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41 {
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42 char *s = _s;
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43 ssize_t res;
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44 size_t pos = 0;
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46 while (n > pos) {
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47 res = (f) (fd, s + pos, n - pos);
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48 switch (res) {
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49 case -1:
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50 #ifdef EWOULDBLOCK
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51 if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)
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52 #else
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53 if (errno == EINTR || errno == EAGAIN)
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54 #endif
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55 continue;
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56 case 0:
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57 return (res);
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58 default:
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59 pos += res;
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60 }
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61 }
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62 return (pos);
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63 }