1 | /* Create a symbolic link named relative to an open directory. Hurd version. |
2 | Copyright (C) 1991-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <errno.h> |
20 | #include <fcntl.h> |
21 | #include <stddef.h> |
22 | #include <unistd.h> |
23 | #include <hurd.h> |
24 | #include <hurd/paths.h> |
25 | #include <hurd/fd.h> |
26 | #include <string.h> |
27 | |
28 | |
29 | /* Make a link to FROM called TO relative to FD. */ |
30 | int |
31 | symlinkat (const char *from, int fd, const char *to) |
32 | { |
33 | error_t err; |
34 | file_t dir, node; |
35 | char *name; |
36 | const size_t len = strlen (from) + 1; |
37 | char buf[sizeof (_HURD_SYMLINK) + len]; |
38 | |
39 | /* A symlink is a file whose translator is "/hurd/symlink\0target\0". */ |
40 | |
41 | memcpy (buf, _HURD_SYMLINK, sizeof (_HURD_SYMLINK)); |
42 | memcpy (&buf[sizeof (_HURD_SYMLINK)], from, len); |
43 | |
44 | dir = __file_name_split_at (fd, to, &name); |
45 | if (dir == MACH_PORT_NULL) |
46 | return -1; |
47 | |
48 | /* Create a new, unlinked node in the target directory. */ |
49 | err = __dir_mkfile (dir, O_WRITE, 0777 & ~_hurd_umask, &node); |
50 | |
51 | if (! err) |
52 | { |
53 | /* Set the node's translator to make it a symlink. */ |
54 | err = __file_set_translator (node, |
55 | FS_TRANS_EXCL|FS_TRANS_SET, |
56 | FS_TRANS_EXCL|FS_TRANS_SET, 0, |
57 | buf, sizeof (_HURD_SYMLINK) + len, |
58 | MACH_PORT_NULL, MACH_MSG_TYPE_COPY_SEND); |
59 | |
60 | if (! err) |
61 | /* Link the node, now a valid symlink, into the target directory. */ |
62 | err = __dir_link (dir, node, name, 1); |
63 | |
64 | __mach_port_deallocate (__mach_task_self (), node); |
65 | } |
66 | |
67 | __mach_port_deallocate (__mach_task_self (), dir); |
68 | |
69 | if (err) |
70 | return __hurd_fail (err); |
71 | return 0; |
72 | } |
73 | |