projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | |
| 29 | readlinkat (fd, file_name, buf, len) | |
| 30 | int fd; | |
| 31 | const char *file_name; | |
| 32 | char *buf; | |
| 33 | size_t len; | |
| 34 | { | |
| 35 | error_t err; | |
| 36 | file_t file; | |
| 37 | struct stat64 st; | |
| 38 | ||
| 39 | file = __file_name_lookup_at (fd, 0, file_name, O_READ | O_NOLINK, 0); | |
| 40 | if (file == MACH_PORT_NULL) | |
| 41 | return -1; | |
| 42 | ||
| 43 | err = __io_stat (file, &st); | |
| 44 | if (! err) | |
| 45 | if (S_ISLNK (st.st_mode)) | |
| 46 | { | |
| 47 | char *rbuf = buf; | |
| 48 | ||
| 49 | err = __io_read (file, &rbuf, &len, 0, len); | |
| 50 | if (!err && rbuf != buf) | |
| 51 | { | |
| 52 | memcpy (buf, rbuf, len); | |
| 53 | __vm_deallocate (__mach_task_self (), (vm_address_t)rbuf, len); | |
| 54 | } | |
| 55 | } | |
| 56 | else | |
| 57 | err = EINVAL; | |
| 58 | ||
| 59 | __mach_port_deallocate (__mach_task_self (), file); | |
| 60 | ||
| 61 | return err ? __hurd_fail (err) : len; | |
| 62 | } | |
| 63 | libc_hidden_def (readlinkat) |