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 <sys/types.h> 27 #include <sys/uio.h> 28 29 #include <errno.h> 30 #include <unistd.h> 31 32 ssize_t atomicio(ssize_t (*f)(int, void *, size_t), int fd, void *_s, size_t n); 33 34 /* 35 * ensure all of data on socket comes through. f==read || f==write 36 */ 37 ssize_t 38 atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n) 39 { 40 char *s = _s; 41 ssize_t res, pos = 0; 42 43 while (n > pos) { 44 res = (f) (fd, s + pos, n - pos); 45 switch (res) { 46 case -1: 47 if (errno == EINTR || errno == EAGAIN) 48 continue; 49 case 0: 50 return (res); 51 default: 52 pos += res; 53 } 54 } 55 return (pos); 56 } 57