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688903eb | 1 | /* Copyright (C) 1991-2018 Free Software Foundation, Inc. |
ebbad4cc | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
ebbad4cc | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 8 | |
ebbad4cc UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 17 | |
28f540f4 RM |
18 | #include <unistd.h> |
19 | #include <hurd.h> | |
20 | #include <hurd/paths.h> | |
21 | #include <fcntl.h> | |
22 | #include <string.h> | |
23 | ||
24 | /* Read the contents of the symbolic link FILE_NAME into no more than | |
25 | LEN bytes of BUF. The contents are not null-terminated. | |
26 | Returns the number of characters read, or -1 for errors. */ | |
27 | ssize_t | |
bd2260a2 | 28 | __readlink (const char *file_name, char *buf, size_t len) |
28f540f4 RM |
29 | { |
30 | error_t err; | |
31 | file_t file; | |
337738b7 | 32 | struct stat64 st; |
28f540f4 | 33 | |
6bac11d9 | 34 | file = __file_name_lookup (file_name, O_READ | O_NOLINK, 0); |
28f540f4 RM |
35 | if (file == MACH_PORT_NULL) |
36 | return -1; | |
37 | ||
6bac11d9 MB |
38 | err = __io_stat (file, &st); |
39 | if (! err) | |
40 | if (S_ISLNK (st.st_mode)) | |
41 | { | |
42 | char *rbuf = buf; | |
43 | ||
44 | err = __io_read (file, &rbuf, &len, 0, len); | |
45 | if (!err && rbuf != buf) | |
46 | { | |
47 | memcpy (buf, rbuf, len); | |
48 | __vm_deallocate (__mach_task_self (), (vm_address_t)rbuf, len); | |
49 | } | |
50 | } | |
51 | else | |
52 | err = EINVAL; | |
53 | ||
28f540f4 RM |
54 | __mach_port_deallocate (__mach_task_self (), file); |
55 | ||
56 | if (err) | |
57 | return __hurd_fail (err); | |
28f540f4 | 58 | else |
6bac11d9 | 59 | return len; |
28f540f4 | 60 | } |
28f540f4 | 61 | weak_alias (__readlink, readlink) |