1 | /* Copyright (C) 1999-2022 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 <unistd.h> |
19 | |
20 | #include <hurd.h> |
21 | #include <hurd/fd.h> |
22 | #include <hurd/port.h> |
23 | |
24 | /* Change the current root directory to FD. */ |
25 | int |
26 | fchroot (int fd) |
27 | { |
28 | error_t err; |
29 | file_t dir; |
30 | |
31 | err = HURD_DPORT_USE (fd, |
32 | ({ |
33 | dir = __file_name_lookup_under (port, "." , 0, 0); |
34 | dir == MACH_PORT_NULL ? errno : 0; |
35 | })); |
36 | |
37 | if (! err) |
38 | { |
39 | file_t root; |
40 | |
41 | /* Prevent going through DIR's .. */ |
42 | err = __file_reparent (dir, MACH_PORT_NULL, &root); |
43 | __mach_port_deallocate (__mach_task_self (), dir); |
44 | if (! err) |
45 | _hurd_port_set (&_hurd_ports[INIT_PORT_CRDIR], root); |
46 | } |
47 | |
48 | return err ? __hurd_fail (err) : 0; |
49 | } |
50 | |