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db11c38c | 1 | /* Copyright (C) 1991,92,93,94,95,97,99,2001 Free Software Foundation, Inc. |
ebbad4cc | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
ebbad4cc UD |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
28f540f4 | 8 | |
ebbad4cc UD |
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 | Library General Public License for more details. | |
28f540f4 | 13 | |
ebbad4cc UD |
14 | You should have received a copy of the GNU Library General Public |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
28f540f4 | 18 | |
db11c38c | 19 | #include <string.h> |
28f540f4 | 20 | #include <unistd.h> |
db11c38c | 21 | |
28f540f4 | 22 | #include <hurd.h> |
28f540f4 RM |
23 | #include <hurd/port.h> |
24 | ||
db11c38c MK |
25 | /* Make PATH be the root directory (the starting point for absolute |
26 | paths). Note that while on traditional UNIX systems this call is | |
27 | restricted to the super-user, it isn't on the Hurd. */ | |
28f540f4 | 28 | int |
db11c38c | 29 | chroot (const char *path) |
28f540f4 | 30 | { |
db11c38c MK |
31 | const char *lookup; |
32 | size_t len; | |
33 | file_t dir, root; | |
34 | error_t err; | |
35 | ||
36 | /* Append trailing "/." to directory name to force ENOTDIR if it's not a | |
37 | directory and EACCES if we don't have search permission. */ | |
38 | len = strlen (path); | |
39 | if (path[len - 2] == '/' && path[len - 1] == '.') | |
40 | lookup = path; | |
41 | else | |
42 | { | |
43 | char *n = alloca (len + 2); | |
44 | memcpy (n, path, len); | |
45 | n[len] = '/'; | |
46 | n[len + 1] = '.'; | |
47 | n[len + 2] = '\0'; | |
48 | lookup = n; | |
49 | } | |
50 | ||
51 | dir = __file_name_lookup (lookup, 0, 0); | |
52 | if (dir == MACH_PORT_NULL) | |
53 | return -1; | |
54 | ||
55 | /* Prevent going through DIR's .. */ | |
56 | err = __file_reparent (dir, MACH_PORT_NULL, &root); | |
57 | __mach_port_deallocate (__mach_task_self (), dir); | |
58 | if (err) | |
59 | return __hurd_fail (err); | |
60 | ||
61 | _hurd_port_set (&_hurd_ports[INIT_PORT_CRDIR], root); | |
62 | return 0; | |
28f540f4 | 63 | } |