1  /* Copyright (C) 1992-2023 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     <https://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  }