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b168057a | 1 | /* Copyright (C) 1991-2015 Free Software Foundation, Inc. |
b29d4053 ST |
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 | |
febb44a4 TS |
15 | License along with the GNU C Library; see the file COPYING.LIB. If |
16 | not, see <http://www.gnu.org/licenses/>. */ | |
b29d4053 ST |
17 | |
18 | #include <unistd.h> | |
19 | #include <hurd.h> | |
20 | #include <hurd/paths.h> | |
21 | #include <hurd/fd.h> | |
22 | #include <fcntl.h> | |
23 | #include <string.h> | |
24 | ||
25 | /* Read the contents of the symbolic link FILE_NAME relative to FD into no more | |
26 | than LEN bytes of BUF. The contents are not null-terminated. | |
27 | Returns the number of characters read, or -1 for errors. */ | |
28 | ssize_t | |
bd2260a2 | 29 | readlinkat (int fd, const char *file_name, char *buf, size_t len) |
b29d4053 ST |
30 | { |
31 | error_t err; | |
32 | file_t file; | |
33 | struct stat64 st; | |
34 | ||
35 | file = __file_name_lookup_at (fd, 0, file_name, O_READ | O_NOLINK, 0); | |
36 | if (file == MACH_PORT_NULL) | |
37 | return -1; | |
38 | ||
39 | err = __io_stat (file, &st); | |
40 | if (! err) | |
41 | if (S_ISLNK (st.st_mode)) | |
42 | { | |
43 | char *rbuf = buf; | |
44 | ||
45 | err = __io_read (file, &rbuf, &len, 0, len); | |
46 | if (!err && rbuf != buf) | |
47 | { | |
48 | memcpy (buf, rbuf, len); | |
49 | __vm_deallocate (__mach_task_self (), (vm_address_t)rbuf, len); | |
50 | } | |
51 | } | |
52 | else | |
53 | err = EINVAL; | |
54 | ||
55 | __mach_port_deallocate (__mach_task_self (), file); | |
56 | ||
57 | return err ? __hurd_fail (err) : len; | |
58 | } | |
59 | libc_hidden_def (readlinkat) |