lib/roken/sendmsg.c

   1 /*
   2  * Copyright (c) 1995, 1996, 1997, 1998, 1999 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 #ifndef _WIN32
  39
  40 ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
  41 sendmsg(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  */
 125 ROKEN_LIB_FUNCTION ssize_t ROKEN_LIB_CALL
 126 sendmsg_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 */