| /* Copyright (C) 1991-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; see the file COPYING.LIB. If |
| not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include <unistd.h> |
| #include <hurd.h> |
| #include <hurd/paths.h> |
| #include <hurd/fd.h> |
| #include <fcntl.h> |
| #include <string.h> |
| |
| /* Read the contents of the symbolic link FILE_NAME relative to FD into no more |
| than LEN bytes of BUF. The contents are not null-terminated. |
| Returns the number of characters read, or -1 for errors. */ |
| ssize_t |
| readlinkat (fd, file_name, buf, len) |
| int fd; |
| const char *file_name; |
| char *buf; |
| size_t len; |
| { |
| error_t err; |
| file_t file; |
| struct stat64 st; |
| |
| file = __file_name_lookup_at (fd, 0, file_name, O_READ | O_NOLINK, 0); |
| if (file == MACH_PORT_NULL) |
| return -1; |
| |
| err = __io_stat (file, &st); |
| if (! err) |
| if (S_ISLNK (st.st_mode)) |
| { |
| char *rbuf = buf; |
| |
| err = __io_read (file, &rbuf, &len, 0, len); |
| if (!err && rbuf != buf) |
| { |
| memcpy (buf, rbuf, len); |
| __vm_deallocate (__mach_task_self (), (vm_address_t)rbuf, len); |
| } |
| } |
| else |
| err = EINVAL; |
| |
| __mach_port_deallocate (__mach_task_self (), file); |
| |
| return err ? __hurd_fail (err) : len; |
| } |
| libc_hidden_def (readlinkat) |
