sysdeps/mach/hurd/getpeername.c

   1 /* Copyright (C) 1992, 1994 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <errno.h>
  21 #include <sys/socket.h>
  22 #include <hurd.h>
  23 #include <hurd/fd.h>
  24 #include <hurd/socket.h>
  25 #include <string.h>
  26
  27 /* Put the address of the peer connected to socket FD into *ADDR
  28    (which is *LEN bytes long), and its actual length into *LEN.  */
  29 int
  30 DEFUN(getpeername, (fd, addr, len),
  31       int fd AND struct sockaddr *addr AND size_t *len)
  32 {
  33   error_t err;
  34   char *buf = (char *) addr;
  35   mach_msg_type_number_t buflen = *len;
  36   int type;
  37   addr_port_t aport;
  38
  39   if (err = HURD_DPORT_USE (fd, __socket_peername (port, &aport)))
  40     return __hurd_dfail (fd, err);
  41
  42   err = __socket_whatis_address (aport, &type, &buf, &buflen);
  43   __mach_port_deallocate (__mach_task_self (), aport);
  44
  45   if (err)
  46     return __hurd_dfail (fd, err);
  47
  48   if (buf != (char *) addr)
  49     {
  50       if (*len < buflen)
  51         *len = buflen;
  52       memcpy (addr, buf, *len);
  53       __vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);
  54     }
  55
  56   addr->sa_family = type;
  57
  58   return 0;
  59 }