| /* Copyright (C) 1991-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include <hurd.h> |
| #include <hurd/port.h> |
| |
| /* Make PATH be the root directory (the starting point for absolute |
| paths). Note that while on traditional UNIX systems this call is |
| restricted to the super-user, it isn't on the Hurd. */ |
| int |
| chroot (const char *path) |
| { |
| const char *lookup; |
| size_t len; |
| file_t dir, root; |
| error_t err; |
| |
| /* Append trailing "/." to directory name to force ENOTDIR if it's not a |
| directory and EACCES if we don't have search permission. */ |
| len = strlen (path); |
| if (len >= 2 && path[len - 2] == '/' && path[len - 1] == '.') |
| lookup = path; |
| else if (len == 0) |
| /* Special-case empty file name according to POSIX. */ |
| return __hurd_fail (ENOENT); |
| else |
| { |
| char *n = alloca (len + 3); |
| memcpy (n, path, len); |
| n[len] = '/'; |
| n[len + 1] = '.'; |
| n[len + 2] = '\0'; |
| lookup = n; |
| } |
| |
| dir = __file_name_lookup (lookup, 0, 0); |
| if (dir == MACH_PORT_NULL) |
| return -1; |
| |
| /* Prevent going through DIR's .. */ |
| err = __file_reparent (dir, MACH_PORT_NULL, &root); |
| __mach_port_deallocate (__mach_task_self (), dir); |
| if (err) |
| return __hurd_fail (err); |
| |
| _hurd_port_set (&_hurd_ports[INIT_PORT_CRDIR], root); |
| return 0; |
| } |