sendmsg.c revision 233294 
1/*
2 * Copyright (c) 1995, 1996, 1997, 1998, 1999 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#include <config.h>
35
36#include "roken.h"
37
38#ifndef _WIN32
39
40ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
41sendmsg(rk_socket_t s, const struct msghdr *msg, int flags)
42{
43    ssize_t ret;
44    size_t tot = 0;
45    int i;
46    char *buf, *p;
47    struct iovec *iov = msg->msg_iov;
48
49    for(i = 0; i < msg->msg_iovlen; ++i)
50	tot += iov[i].iov_len;
51    buf = malloc(tot);
52    if (tot != 0 && buf == NULL) {
53	errno = ENOMEM;
54	return -1;
55    }
56    p = buf;
57    for (i = 0; i < msg->msg_iovlen; ++i) {
58	memcpy (p, iov[i].iov_base, iov[i].iov_len);
59	p += iov[i].iov_len;
60    }
61    ret = sendto (s, buf, tot, flags, msg->msg_name, msg->msg_namelen);
62    free (buf);
63    return ret;
64}
65
66#else /* _WIN32 */
67
68/***********************************************************************
69 * Copyright (c) 2009, Secure Endpoints Inc.
70 * All rights reserved.
71 *
72 * Redistribution and use in source and binary forms, with or without
73 * modification, are permitted provided that the following conditions
74 * are met:
75 *
76 * - Redistributions of source code must retain the above copyright
77 *   notice, this list of conditions and the following disclaimer.
78 *
79 * - Redistributions in binary form must reproduce the above copyright
80 *   notice, this list of conditions and the following disclaimer in
81 *   the documentation and/or other materials provided with the
82 *   distribution.
83 *
84 * - Neither the name of Secure Endpoints Inc. nor the names of its
85 *   contributors may be used to endorse or promote products derived
86 *   from this software without specific prior written permission.
87 *
88 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
89 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
90 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
91 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
92 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
93 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
94 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
95 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
96 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
97 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
98 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
99 * OF THE POSSIBILITY OF SUCH DAMAGE.
100 *
101 **********************************************************************/
102
103/**
104 * Implementation of sendmsg() for WIN32
105 *
106 * We are using a contrived definition of msghdr which actually uses
107 * an array of ::_WSABUF structures instead of ::iovec .  This allows
108 * us to call WSASend directly using the given ::msghdr instead of
109 * having to allocate another array of ::_WSABUF and copying data for
110 * each call.
111 *
112 * Limitations:
113 *
114 * - msg->msg_name is ignored.  So is msg->control.
115 * - WSASend() only supports ::MSG_DONTROUTE, ::MSG_OOB and
116 *   ::MSG_PARTIAL.
117 *
118 * @param[in] s The socket to use.
119 * @param[in] msg The message
120 * @param[in] flags Flags.  A combination of ::MSG_DONTROUTE,
121 *  ::MSG_OOB and ::MSG_PARTIAL
122 *
123 * @return The number of bytes sent, on success.  Or -1 on error.
124 */
125ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
126sendmsg_w32(rk_socket_t s, const struct msghdr * msg, int flags)
127{
128    int srv;
129    DWORD num_bytes_sent = 0;
130
131    /* TODO: For _WIN32_WINNT >= 0x0600 we can use WSASendMsg using
132       WSAMSG which is a much more direct analogue to sendmsg(). */
133
134    srv = WSASend(s, msg->msg_iov, msg->msg_iovlen,
135		  &num_bytes_sent, flags, NULL, NULL);
136
137    if (srv == 0)
138	return (int) num_bytes_sent;
139
140    /* srv == SOCKET_ERROR and WSAGetLastError() == WSA_IO_PENDING
141       indicates that a non-blocking transfer has been scheduled.
142       We'll have to check for that if we ever support non-blocking
143       I/O. */
144
145    return -1;
146}
147
148#endif /* !_WIN32 */
149