| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1999-2016 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 | <http://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 | } |