1 | /* Copyright (C) 1991-2022 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 <string.h> |
19 | #include <unistd.h> |
20 | #include <hurd.h> |
21 | #include <hurd/paths.h> |
22 | #include <fcntl.h> |
23 | |
24 | /* Make a link to FROM called TO. */ |
25 | int |
26 | __symlink (const char *from, const char *to) |
27 | { |
28 | error_t err; |
29 | file_t dir, node; |
30 | char *name; |
31 | const size_t len = strlen (from) + 1; |
32 | char buf[sizeof (_HURD_SYMLINK) + len]; |
33 | |
34 | /* A symlink is a file whose translator is "/hurd/symlink\0target\0". */ |
35 | |
36 | memcpy (buf, _HURD_SYMLINK, sizeof (_HURD_SYMLINK)); |
37 | memcpy (&buf[sizeof (_HURD_SYMLINK)], from, len); |
38 | |
39 | dir = __file_name_split (to, &name); |
40 | if (dir == MACH_PORT_NULL) |
41 | return -1; |
42 | |
43 | /* Create a new, unlinked node in the target directory. */ |
44 | err = __dir_mkfile (dir, O_WRITE, 0777 & ~_hurd_umask, &node); |
45 | |
46 | if (! err) |
47 | { |
48 | /* Set the node's translator to make it a symlink. */ |
49 | err = __file_set_translator (node, |
50 | FS_TRANS_EXCL|FS_TRANS_SET, |
51 | FS_TRANS_EXCL|FS_TRANS_SET, 0, |
52 | buf, sizeof (_HURD_SYMLINK) + len, |
53 | MACH_PORT_NULL, MACH_MSG_TYPE_COPY_SEND); |
54 | |
55 | if (! err) |
56 | /* Link the node, now a valid symlink, into the target directory. */ |
57 | err = __dir_link (dir, node, name, 1); |
58 | |
59 | __mach_port_deallocate (__mach_task_self (), node); |
60 | } |
61 | |
62 | __mach_port_deallocate (__mach_task_self (), dir); |
63 | |
64 | if (err) |
65 | return __hurd_fail (err); |
66 | return 0; |
67 | } |
68 | |
69 | weak_alias (__symlink, symlink) |
70 | |