1/* $NetBSD: net_read.c,v 1.2 2017/01/28 21:31:50 christos Exp $ */ 2 3/* 4 * Copyright (c) 1995, 1996, 1997, 1998 Kungliga Tekniska H��gskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 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 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36#include <config.h> 37 38#include <krb5/roken.h> 39 40/* 41 * Like read but never return partial data. 42 */ 43 44#ifndef _WIN32 45 46ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL 47net_read (rk_socket_t fd, void *buf, size_t nbytes) 48{ 49 char *cbuf = (char *)buf; 50 ssize_t count; 51 size_t rem = nbytes; 52 53 while (rem > 0) { 54 count = read (fd, cbuf, rem); 55 if (count < 0) { 56 if (errno == EINTR) 57 continue; 58 else 59 return count; 60 } else if (count == 0) { 61 return count; 62 } 63 cbuf += count; 64 rem -= count; 65 } 66 return nbytes; 67} 68 69#else 70 71ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL 72net_read(rk_socket_t sock, void *buf, size_t nbytes) 73{ 74 char *cbuf = (char *)buf; 75 ssize_t count; 76 size_t rem = nbytes; 77 78#ifdef SOCKET_IS_NOT_AN_FD 79 int use_read = 0; 80#endif 81 82 while (rem > 0) { 83#ifdef SOCKET_IS_NOT_AN_FD 84 if (use_read) 85 count = _read (sock, cbuf, rem); 86 else 87 count = recv (sock, cbuf, rem, 0); 88 89 if (use_read == 0 && 90 rk_IS_SOCKET_ERROR(count) && 91 (rk_SOCK_ERRNO == WSANOTINITIALISED || 92 rk_SOCK_ERRNO == WSAENOTSOCK)) { 93 use_read = 1; 94 95 count = _read (sock, cbuf, rem); 96 } 97#else 98 count = recv (sock, cbuf, rem, 0); 99#endif 100 if (count < 0) { 101 102 /* With WinSock, the error EINTR (WSAEINTR), is used to 103 indicate that a blocking call was cancelled using 104 WSACancelBlockingCall(). */ 105 106#ifndef HAVE_WINSOCK 107 if (rk_SOCK_ERRNO == EINTR) 108 continue; 109#endif 110 return count; 111 } else if (count == 0) { 112 return count; 113 } 114 cbuf += count; 115 rem -= count; 116 } 117 return nbytes; 118} 119 120#endif 121