1 /* 2 * Copyright (c) 1995,1999 Theo de Raadt. All rights reserved. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include "includes.h" 27 RCSID("$OpenBSD: atomicio.c,v 1.10 2001/05/08 22:48:07 markus Exp $"); 28 29 #include "atomicio.h" 30 31 /* 32 * ensure all of data on socket comes through. f==read || f==write 33 */ 34 ssize_t 35 atomicio(f, fd, _s, n) 36 ssize_t (*f) (); 37 int fd; 38 void *_s; 39 size_t n; 40 { 41 char *s = _s; 42 ssize_t res, pos = 0; 43 44 while (n > pos) { 45 res = (f) (fd, s + pos, n - pos); 46 switch (res) { 47 case -1: 48 #ifdef EWOULDBLOCK 49 if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK) 50 #else 51 if (errno == EINTR || errno == EAGAIN) 52 #endif 53 continue; 54 case 0: 55 return (res); 56 default: 57 pos += res; 58 } 59 } 60 return (pos); 61 } 62