1 /*	$NetBSD: net_write.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 write but never return partial data.
42  */
43 
44 #ifndef _WIN32
45 
46 ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
47 net_write (rk_socket_t fd, const void *buf, size_t nbytes)
48 {
49     const char *cbuf = (const char *)buf;
50     ssize_t count;
51     size_t rem = nbytes;
52 
53     while (rem > 0) {
54 	count = write (fd, cbuf, rem);
55 	if (count < 0) {
56 	    if (errno == EINTR)
57 		continue;
58 	    else
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_write(rk_socket_t sock, const void *buf, size_t nbytes)
71 {
72     const char *cbuf = (const char *)buf;
73     ssize_t count;
74     size_t rem = nbytes;
75 #ifdef SOCKET_IS_NOT_AN_FD
76     int use_write = 0;
77 #endif
78 
79     while (rem > 0) {
80 #ifdef SOCKET_IS_NOT_AN_FD
81 	if (use_write)
82 	    count = _write (sock, cbuf, rem);
83 	else
84 	    count = send (sock, cbuf, rem, 0);
85 
86 	if (use_write == 0 &&
87 	    rk_IS_SOCKET_ERROR(count) &&
88 	    (rk_SOCK_ERRNO == WSANOTINITIALISED ||
89              rk_SOCK_ERRNO == WSAENOTSOCK)) {
90 	    use_write = 1;
91 
92 	    count = _write (sock, cbuf, rem);
93 	}
94 #else
95 	count = send (sock, cbuf, rem, 0);
96 #endif
97 	if (count < 0) {
98 	    if (errno == EINTR)
99 		continue;
100 	    else
101 		return count;
102 	}
103 	cbuf += count;
104 	rem -= count;
105     }
106     return nbytes;
107 }
108 
109 #endif
110