1 /* $NetBSD: net_read.c,v 1.1.1.1 2011/04/13 18:15:42 elric Exp $ */
2
3 /*
4 * Copyright (c) 1995, 1996, 1997, 1998 Kungliga Tekniska Högskolan
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
46 ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
net_read(rk_socket_t fd,void * buf,size_t nbytes)47 net_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
71 ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
net_read(rk_socket_t sock,void * buf,size_t nbytes)72 net_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