1 /* 2 * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved. 3 * Copyright (c) 1995,1999 Theo de Raadt. All rights reserved. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include "includes.h" 28 RCSID("$OpenBSD: atomicio.c,v 1.13 2005/05/24 17:32:43 avsm Exp $"); 29 30 #include "atomicio.h" 31 32 /* 33 * ensure all of data on socket comes through. f==read || f==vwrite 34 */ 35 size_t 36 atomicio(f, fd, _s, n) 37 ssize_t (*f) (int, void *, size_t); 38 int fd; 39 void *_s; 40 size_t n; 41 { 42 char *s = _s; 43 size_t pos = 0; 44 ssize_t res; 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 return 0; 57 case 0: 58 errno = EPIPE; 59 return pos; 60 default: 61 pos += (u_int)res; 62 } 63 } 64 return (pos); 65 } 66