| 1 | /* Make a link between file names relative to open directories. Hurd version. |
|---|
| 2 | Copyright (C) 2006-2022 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/fd.h> |
|---|
| 25 | |
|---|
| 26 | |
|---|
| 27 | /* Make a link to FROM relative to FROMFD called TO relative to TOFD. */ |
|---|
| 28 | int |
|---|
| 29 | linkat (int fromfd, const char *from, int tofd, const char *to, int flags) |
|---|
| 30 | { |
|---|
| 31 | error_t err; |
|---|
| 32 | file_t oldfile, linknode, todir; |
|---|
| 33 | char *toname; |
|---|
| 34 | |
|---|
| 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); |
|---|
| 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 | } |
|---|
| 63 | |
|---|
