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 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 #include "atomicio.h" 32 33 /* 34 * ensure all of data on socket comes through. f==read || f==write 35 */ 36 ssize_t 37 atomicio(f, fd, _s, n) 38 ssize_t (*f) (); 39 int fd; 40 void *_s; 41 size_t n; 42 { 43 char *s = _s; 44 ssize_t res, pos = 0; 45 46 while (n > pos) { 47 res = (f) (fd, s + pos, n - pos); 48 switch (res) { 49 case -1: 50 #ifdef EWOULDBLOCK 51 if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK) 52 #else 53 if (errno == EINTR || errno == EAGAIN) 54 #endif 55 continue; 56 /* FALLTHROUGH */ 57 case 0: 58 return (res); 59 default: 60 pos += res; 61 } 62 } 63 return (pos); 64 } 65