1 /* $OpenBSD: atomicio.c,v 1.7 2005/05/26 01:01:08 avsm Exp $ */ 2 3 /* 4 * Copyright (c) 2005 Anil Madhavapeddy. All rights served. 5 * Copyright (c) 1995,1999 Theo de Raadt. All rights reserved. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/types.h> 30 #include <sys/uio.h> 31 #include <errno.h> 32 #include <unistd.h> 33 34 #include "atomicio.h" 35 36 __RCSID("$MirOS: src/usr.bin/nc/atomicio.c,v 1.4 2005/11/23 18:04:10 tg Exp $"); 37 38 /* 39 * ensure all of data on socket comes through. f==read || f==vwrite 40 */ 41 size_t 42 atomicio(f, fd, _s, n) 43 ssize_t (*f) (int, void *, size_t); 44 int fd; 45 void *_s; 46 size_t n; 47 { 48 char *s = _s; 49 size_t pos = 0; 50 ssize_t res; 51 52 while (n > pos) { 53 res = (f) (fd, s + pos, n - pos); 54 switch (res) { 55 case -1: 56 if (errno == EINTR || errno == EAGAIN) 57 continue; 58 return 0; 59 case 0: 60 errno = EPIPE; 61 return pos; 62 default: 63 pos += (u_int)res; 64 } 65 } 66 return pos; 67 } 68