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 /* 33 * ensure all of data on socket comes through. f==read || f==write 34 */ 35 ssize_t 36 atomicio(f, fd, _s, n) 37 ssize_t (*f) (); 38 int fd; 39 void *_s; 40 size_t n; 41 { 42 char *s = _s; 43 ssize_t res, pos = 0; 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 case 0: 52 return (res); 53 default: 54 pos += res; 55 } 56 } 57 return (pos); 58 } 59