sendto.c

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/* Copyright (C) 1994,95,96,97,99,2001,02 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <hurd.h>
#include <hurd/fd.h>
#include <hurd/ifsock.h>
#include <hurd/socket.h>

/* Send N bytes of BUF on socket FD to peer at address ADDR (which is
   ADDR_LEN bytes long).  Returns the number sent, or -1 for errors.  */
ssize_t
__sendto (int fd,
      const void *buf,
      size_t n,
      int flags,
      const struct sockaddr_un *addr,
      socklen_t addr_len)
{
  addr_port_t aport = MACH_PORT_NULL;
  error_t err;
  size_t wrote;

  /* Get an address port for the desired destination address.  */
  error_t create_address_port (io_t port,
                   const struct sockaddr_un *addr,
                   socklen_t addr_len,
                   addr_port_t *aport)
    {
      error_t err_port;

      if (addr->sun_family == AF_LOCAL)
    {
      /* For the local domain, we must look up the name as a file and talk
         to it with the ifsock protocol.  */
      file_t file = __file_name_lookup (addr->sun_path, 0, 0);
      if (file == MACH_PORT_NULL)
        return errno;
      err_port = __ifsock_getsockaddr (file, aport);
      __mach_port_deallocate (__mach_task_self (), file);
      if (err_port == MIG_BAD_ID || err_port == EOPNOTSUPP)
        /* The file did not grok the ifsock protocol.  */
        err_port = ENOTSOCK;
    }
      else
    {
      err_port = __socket_create_address (port,
                          addr->sun_family,
                          (char *) addr,
                          addr_len,
                          aport);
    }

      return err_port;
    }

  err = HURD_DPORT_USE (fd,
            ({
              if (addr != NULL)
                err = create_address_port (port, addr, addr_len,
                               &aport);
              else
                err = 0;
              if (! err)
                {
                  /* Send the data.  */
                  err = __socket_send (port, aport,
                           flags, buf, n,
                           NULL,
                           MACH_MSG_TYPE_COPY_SEND, 0,
                           NULL, 0, &wrote);
                }
              err;
            }));

  if (aport != MACH_PORT_NULL)
    __mach_port_deallocate (__mach_task_self (), aport);

  return err ? __hurd_sockfail (fd, flags, err) : wrote;
}

weak_alias (__sendto, sendto)