1  /* Set a host configuration item kept as the whole contents of a file.
       2     Copyright (C) 1996-2023 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 Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the 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     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <fcntl.h>
      20  #include <hurd.h>
      21  #include "hurdhost.h"
      22  
      23  ssize_t
      24  _hurd_set_host_config (const char *item, const char *value, size_t valuelen)
      25  {
      26    error_t err;
      27    vm_size_t nwrote;
      28    file_t new, dir;
      29    char *name;
      30  
      31    dir = __file_name_split (item, &name);
      32    if (dir == MACH_PORT_NULL)
      33      return -1;
      34  
      35    /* Create a new node.  */
      36    err = __dir_mkfile (dir, O_WRONLY, 0644, &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, name, 0);
      44        __mach_port_deallocate (__mach_task_self (), new);
      45      }
      46    __mach_port_deallocate (__mach_task_self (), dir);
      47  
      48    return err ? __hurd_fail (err) : nwrote;
      49  }