Fix concurrent changes on nscd aware files (BZ #23178)
[glibc.git] / hurd / set-host.c
blob6e20d15d4bb87bcf562701181ba1fdd016fa9b79
1 /* Set a host configuration item kept as the whole contents of a file.
2 Copyright (C) 1996-2018 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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 <http://www.gnu.org/licenses/>. */
19 #include <fcntl.h>
20 #include <hurd.h>
21 #include "hurdhost.h"
23 ssize_t
24 _hurd_set_host_config (const char *item, const char *value, size_t valuelen)
26 error_t err;
27 mach_msg_type_number_t nwrote;
28 file_t new, dir;
29 char *name;
31 dir = __file_name_split (item, &name);
32 if (dir == MACH_PORT_NULL)
33 return -1;
35 /* Create a new node. */
36 err = __dir_mkfile (dir, O_WRONLY, 0644, &new);
37 if (! err)
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);
46 __mach_port_deallocate (__mach_task_self (), dir);
48 return err ? __hurd_fail (err) : nwrote;