sysdeps/mach/hurd/getsockopt.c

   1 /* Copyright (C) 1992,94,97,2001,02 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <sys/socket.h>
  21 #include <hurd.h>
  22 #include <hurd/fd.h>
  23 #include <hurd/socket.h>
  24 #include <string.h>
  25
  26 /* Put the current value for socket FD's option OPTNAME at protocol level LEVEL
  27    into OPTVAL (which is *OPTLEN bytes long), and set *OPTLEN to the value's
  28    actual length.  Returns 0 on success, -1 for errors.  */
  29
  30 /* XXX should be __getsockopt ? */
  31 int
  32 getsockopt (int fd,
  33             int level,
  34             int optname,
  35             void *optval,
  36             socklen_t *optlen)
  37 {
  38   error_t err;
  39   char *buf = optval;
  40   mach_msg_type_number_t buflen = *optlen;
  41
  42   if (err = HURD_DPORT_USE (fd, __socket_getopt (port,
  43                                                  level, optname,
  44                                                  &buf, &buflen)))
  45     return __hurd_dfail (fd, err);
  46
  47   if (*optlen > buflen)
  48     *optlen = buflen;
  49   if (buf != optval)
  50     {
  51       memcpy (optval, buf, *optlen);
  52       __vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);
  53     }
  54
  55   return 0;
  56 }