sysdeps/mach/hurd/sendto.c

   1 /* Copyright (C) 1994-2018 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 #include "hurd/hurdsocket.h"
  26
  27 /* Send N bytes of BUF on socket FD to peer at address ADDR (which is
  28    ADDR_LEN bytes long).  Returns the number sent, or -1 for errors.  */
  29 ssize_t
  30 __sendto (int fd,
  31           const void *buf,
  32           size_t n,
  33           int flags,
  34           const struct sockaddr_un *addr,
  35           socklen_t addr_len)
  36 {
  37   addr_port_t aport = MACH_PORT_NULL;
  38   error_t err;
  39   size_t wrote;
  40
  41   /* Get an address port for the desired destination address.  */
  42   error_t create_address_port (io_t port,
  43                                const struct sockaddr_un *addr,
  44                                socklen_t addr_len,
  45                                addr_port_t *aport)
  46     {
  47       error_t err_port;
  48
  49       if (addr->sun_family == AF_LOCAL)
  50         {
  51           char *name = _hurd_sun_path_dupa (addr, addr_len);
  52           /* For the local domain, we must look up the name as a file and talk
  53              to it with the ifsock protocol.  */
  54           file_t file = __file_name_lookup (name, 0, 0);
  55           if (file == MACH_PORT_NULL)
  56             return errno;
  57           err_port = __ifsock_getsockaddr (file, aport);
  58           __mach_port_deallocate (__mach_task_self (), file);
  59           if (err_port == MIG_BAD_ID || err_port == EOPNOTSUPP)
  60             /* The file did not grok the ifsock protocol.  */
  61             err_port = ENOTSOCK;
  62         }
  63       else
  64         {
  65           err_port = __socket_create_address (port,
  66                                               addr->sun_family,
  67                                               (char *) addr,
  68                                               addr_len,
  69                                               aport);
  70         }
  71
  72       return err_port;
  73     }
  74
  75   err = HURD_DPORT_USE (fd,
  76                         ({
  77                           if (addr != NULL)
  78                             err = create_address_port (port, addr, addr_len,
  79                                                        &aport);
  80                           else
  81                             err = 0;
  82                           if (! err)
  83                             {
  84                               /* Send the data.  */
  85                               err = __socket_send (port, aport,
  86                                                    flags, buf, n,
  87                                                    NULL,
  88                                                    MACH_MSG_TYPE_COPY_SEND, 0,
  89                                                    NULL, 0, &wrote);
  90                             }
  91                           err;
  92                         }));
  93
  94   if (aport != MACH_PORT_NULL)
  95     __mach_port_deallocate (__mach_task_self (), aport);
  96
  97   return err ? __hurd_sockfail (fd, flags, err) : wrote;
  98 }
  99
 100 weak_alias (__sendto, sendto)