| xf.li | bfc6e71 | 2025-02-07 01:54:34 -0800 | [diff] [blame^] | 1 | /* Copyright (C) 1991-2016 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 | <http://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 |
| 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) |