1 /* 2 * Copyright (c) 1995, 1996, 1997, 1998 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 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 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 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 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifdef HAVE_CONFIG_H 35 #include <config.h> 36 RCSID("$Id: net_read.c,v 1.3 1999/12/02 16:58:51 joda Exp $"); 37 #endif 38 39 #include <sys/types.h> 40 #include <unistd.h> 41 #include <errno.h> 42 43 #include <roken.h> 44 45 /* 46 * Like read but never return partial data. 47 */ 48 49 ssize_t 50 net_read (int fd, void *buf, size_t nbytes) 51 { 52 char *cbuf = (char *)buf; 53 ssize_t count; 54 size_t rem = nbytes; 55 56 while (rem > 0) { 57 #ifdef WIN32 58 count = recv (fd, cbuf, rem, 0); 59 #else 60 count = read (fd, cbuf, rem); 61 #endif 62 if (count < 0) { 63 if (errno == EINTR) 64 continue; 65 else 66 return count; 67 } else if (count == 0) { 68 return count; 69 } 70 cbuf += count; 71 rem -= count; 72 } 73 return nbytes; 74 } 75