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
__symlink(const char * from,const char * to)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