hurd/set-host.c

   1 /* Set a host configuration item kept as the whole contents of a file.
   2 Copyright (C) 1996 Free Software Foundation, Inc.
   3 This file is part of the GNU C Library.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #include <fcntl.h>
  21 #include <hurd.h>
  22 #include "hurdhost.h"
  23
  24 ssize_t
  25 _hurd_set_host_config (const char *item, const char *value, size_t valuelen)
  26 {
  27   error_t err;
  28   mach_msg_type_number_t nwrote;
  29   file_t new, dir;
  30
  31   dir = __file_name_split (item, &item);
  32   if (dir == MACH_PORT_NULL)
  33     return -1;
  34
  35   /* Create a new node.  */
  36   err = __dir_mkfile (dir, O_CREAT|O_TRUNC, 0600, &new);
  37   if (! err)
  38     {
  39       /* Write the contents.  */
  40       err = __io_write (new, value, valuelen, 0, &nwrote);
  41       if (! err)
  42         /* Atomically link the new node onto the name.  */
  43         err = __dir_link (dir, new, item, 0);
  44       __mach_port_deallocate (__mach_task_self (), new);
  45     }
  46   __mach_port_deallocate (__mach_task_self (), dir);
  47
  48   return nwrote;
  49 }