sysdeps/mach/hurd/sendto.c

   1 /* Copyright (C) 1994-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <sys/socket.h>
  20 #include <sys/un.h>
  21 #include <hurd.h>
  22 #include <hurd/fd.h>
  23 #include <hurd/ifsock.h>
  24 #include <hurd/socket.h>
  25
  26 /* Send N bytes of BUF on socket FD to peer at address ADDR (which is
  27    ADDR_LEN bytes long).  Returns the number sent, or -1 for errors.  */
  28 ssize_t
  29 __sendto (int fd,
  30           const void *buf,
  31           size_t n,
  32           int flags,
  33           const struct sockaddr_un *addr,
  34           socklen_t addr_len)
  35 {
  36   addr_port_t aport = MACH_PORT_NULL;
  37   error_t err;
  38   size_t wrote;
  39
  40   /* Get an address port for the desired destination address.  */
  41   error_t create_address_port (io_t port,
  42                                const struct sockaddr_un *addr,
  43                                socklen_t addr_len,
  44                                addr_port_t *aport)
  45     {
  46       error_t err_port;
  47
  48       if (addr->sun_family == AF_LOCAL)
  49         {
  50           /* For the local domain, we must look up the name as a file and talk
  51              to it with the ifsock protocol.  */
  52           file_t file = __file_name_lookup (addr->sun_path, 0, 0);
  53           if (file == MACH_PORT_NULL)
  54             return errno;
  55           err_port = __ifsock_getsockaddr (file, aport);
  56           __mach_port_deallocate (__mach_task_self (), file);
  57           if (err_port == MIG_BAD_ID || err_port == EOPNOTSUPP)
  58             /* The file did not grok the ifsock protocol.  */
  59             err_port = ENOTSOCK;
  60         }
  61       else
  62         {
  63           err_port = __socket_create_address (port,
  64                                               addr->sun_family,
  65                                               (char *) addr,
  66                                               addr_len,
  67                                               aport);
  68         }
  69
  70       return err_port;
  71     }
  72
  73   err = HURD_DPORT_USE (fd,
  74                         ({
  75                           if (addr != NULL)
  76                             err = create_address_port (port, addr, addr_len,
  77                                                        &aport);
  78                           else
  79                             err = 0;
  80                           if (! err)
  81                             {
  82                               /* Send the data.  */
  83                               err = __socket_send (port, aport,
  84                                                    flags, buf, n,
  85                                                    NULL,
  86                                                    MACH_MSG_TYPE_COPY_SEND, 0,
  87                                                    NULL, 0, &wrote);
  88                             }
  89                           err;
  90                         }));
  91
  92   if (aport != MACH_PORT_NULL)
  93     __mach_port_deallocate (__mach_task_self (), aport);
  94
  95   return err ? __hurd_sockfail (fd, flags, err) : wrote;
  96 }
  97
  98 weak_alias (__sendto, sendto)