| 1 | /* |
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| 2 | * Copyright (c) 1995,1999 Theo de Raadt. All rights reserved. |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * 1. Redistributions of source code must retain the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer. |
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer in the |
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| 12 | * documentation and/or other materials provided with the distribution. |
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| 13 | * |
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| 14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 17 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 24 | */ |
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| 25 | |
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| 26 | #include "includes.h" |
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| 27 | RCSID("$OpenBSD: atomicio.c,v 1.10 2001/05/08 22:48:07 markus Exp $"); |
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| 28 | |
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| 29 | #include "atomicio.h" |
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| 30 | |
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| 31 | /* |
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| 32 | * ensure all of data on socket comes through. f==read || f==write |
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| 33 | */ |
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| 34 | ssize_t |
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| 35 | atomicio(f, fd, _s, n) |
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| 36 | ssize_t (*f) (); |
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| 37 | int fd; |
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| 38 | void *_s; |
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| 39 | size_t n; |
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| 40 | { |
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| 41 | char *s = _s; |
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| 42 | ssize_t res, pos = 0; |
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| 43 | |
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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 | #ifdef EWOULDBLOCK |
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| 49 | if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK) |
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| 50 | #else |
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| 51 | if (errno == EINTR || errno == EAGAIN) |
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| 52 | #endif |
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| 53 | continue; |
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| 54 | case 0: |
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| 55 | return (res); |
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| 56 | default: |
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| 57 | pos += res; |
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| 58 | } |
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| 59 | } |
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| 60 | return (pos); |
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| 61 | } |
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