1 /* 2 * Copyright (c) 1995, 1996, 1997, 1998 Kungliga Tekniska Högskolan 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 #include <config.h> 35 36 #include "roken.h" 37 38 /* 39 * Like read but never return partial data. 40 */ 41 42 #ifndef _WIN32 43 44 ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL 45 net_read (rk_socket_t fd, void *buf, size_t nbytes) 46 { 47 char *cbuf = (char *)buf; 48 ssize_t count; 49 size_t rem = nbytes; 50 51 while (rem > 0) { 52 count = read (fd, cbuf, rem); 53 if (count < 0) { 54 if (errno == EINTR) 55 continue; 56 else 57 return count; 58 } else if (count == 0) { 59 return count; 60 } 61 cbuf += count; 62 rem -= count; 63 } 64 return nbytes; 65 } 66 67 #else 68 69 ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL 70 net_read(rk_socket_t sock, void *buf, size_t nbytes) 71 { 72 char *cbuf = (char *)buf; 73 ssize_t count; 74 size_t rem = nbytes; 75 76 #ifdef SOCKET_IS_NOT_AN_FD 77 int use_read = 0; 78 #endif 79 80 while (rem > 0) { 81 #ifdef SOCKET_IS_NOT_AN_FD 82 if (use_read) 83 count = _read (sock, cbuf, rem); 84 else 85 count = recv (sock, cbuf, rem, 0); 86 87 if (use_read == 0 && 88 rk_IS_SOCKET_ERROR(count) && 89 (rk_SOCK_ERRNO == WSANOTINITIALISED || 90 rk_SOCK_ERRNO == WSAENOTSOCK)) { 91 use_read = 1; 92 93 count = _read (sock, cbuf, rem); 94 } 95 #else 96 count = recv (sock, cbuf, rem, 0); 97 #endif 98 if (count < 0) { 99 100 /* With WinSock, the error EINTR (WSAEINTR), is used to 101 indicate that a blocking call was cancelled using 102 WSACancelBlockingCall(). */ 103 104 #ifndef HAVE_WINSOCK 105 if (rk_SOCK_ERRNO == EINTR) 106 continue; 107 #endif 108 return count; 109 } else if (count == 0) { 110 return count; 111 } 112 cbuf += count; 113 rem -= count; 114 } 115 return nbytes; 116 } 117 118 #endif 119