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16a10468 | 1 | /* Make a link between file names relative to open directories. Hurd version. |
688903eb | 2 | Copyright (C) 2006-2018 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/fd.h> | |
25 | ||
26 | ||
27 | /* Make a link to FROM relative to FROMFD called TO relative to TOFD. */ | |
28 | int | |
bd2260a2 | 29 | linkat (int fromfd, const char *from, int tofd, const char *to, int flags) |
16a10468 RM |
30 | { |
31 | error_t err; | |
32 | file_t oldfile, linknode, todir; | |
33 | char *toname; | |
34 | ||
2a50c078 EPM |
35 | /* POSIX says linkat doesn't follow symlinks by default, so pass |
36 | O_NOLINK. That can be overridden by AT_SYMLINK_FOLLOW in FLAGS. */ | |
37 | oldfile = __file_name_lookup_at (fromfd, flags, from, O_NOLINK, 0); | |
16a10468 RM |
38 | if (oldfile == MACH_PORT_NULL) |
39 | return -1; | |
40 | ||
41 | /* The file_getlinknode RPC returns the port that should be passed to | |
42 | the receiving filesystem (the one containing TODIR) in dir_link. */ | |
43 | ||
44 | err = __file_getlinknode (oldfile, &linknode); | |
45 | __mach_port_deallocate (__mach_task_self (), oldfile); | |
46 | if (err) | |
47 | return __hurd_fail (err); | |
48 | ||
49 | todir = __file_name_split_at (tofd, to, &toname); | |
50 | if (todir != MACH_PORT_NULL) | |
51 | { | |
52 | err = __dir_link (todir, linknode, toname, 1); | |
53 | __mach_port_deallocate (__mach_task_self (), todir); | |
54 | } | |
55 | __mach_port_deallocate (__mach_task_self (), linknode); | |
56 | if (todir == MACH_PORT_NULL) | |
57 | return -1; | |
58 | ||
59 | if (err) | |
60 | return __hurd_fail (err); | |
61 | return 0; | |
62 | } |