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