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16a10468 | 1 | /* Create a symbolic link named relative to an open directory. Hurd version. |
b168057a | 2 | Copyright (C) 1991-2015 Free Software Foundation, Inc. |
16a10468 RM |
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 | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
16a10468 RM |
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 | |
bd2260a2 | 31 | symlinkat (const char *from, int fd, const char *to) |
16a10468 RM |
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) | |
87ef29ca RM |
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); | |
16a10468 | 59 | |
87ef29ca RM |
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 | } | |
16a10468 RM |
66 | |
67 | __mach_port_deallocate (__mach_task_self (), dir); | |
16a10468 RM |
68 | |
69 | if (err) | |
70 | return __hurd_fail (err); | |
71 | return 0; | |
72 | } |