sysdeps/mach/hurd/getsockopt.c

   1 /* Copyright (C) 1992-2018 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 <hurd.h>
  21 #include <hurd/fd.h>
  22 #include <hurd/socket.h>
  23 #include <string.h>
  24
  25 /* Put the current value for socket FD's option OPTNAME at protocol level LEVEL
  26    into OPTVAL (which is *OPTLEN bytes long), and set *OPTLEN to the value's
  27    actual length.  Returns 0 on success, -1 for errors.  */
  28
  29 /* XXX should be __getsockopt ? */
  30 int
  31 getsockopt (int fd,
  32             int level,
  33             int optname,
  34             void *optval,
  35             socklen_t *optlen)
  36 {
  37   error_t err;
  38   char *buf = optval;
  39   mach_msg_type_number_t buflen = *optlen;
  40
  41   if (err = HURD_DPORT_USE (fd, __socket_getopt (port,
  42                                                  level, optname,
  43                                                  &buf, &buflen)))
  44     return __hurd_dfail (fd, err);
  45
  46   if (*optlen > buflen)
  47     *optlen = buflen;
  48   if (buf != optval)
  49     {
  50       memcpy (optval, buf, *optlen);
  51       __vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);
  52     }
  53
  54   return 0;
  55 }