1 | /* Query filename corresponding to an open FD. Linux version. |
2 | Copyright (C) 2001-2016 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <stdlib.h> |
20 | #include <string.h> |
21 | #include <sys/stat.h> |
22 | #include <_itoa.h> |
23 | |
24 | static inline const char * |
25 | fd_to_filename (int fd) |
26 | { |
27 | char *ret = malloc (30); |
28 | |
29 | if (ret != NULL) |
30 | { |
31 | struct stat64 st; |
32 | |
33 | *_fitoa_word (fd, __stpcpy (ret, "/proc/self/fd/" ), 10, 0) = '\0'; |
34 | |
35 | /* We must make sure the file exists. */ |
36 | if (__lxstat64 (_STAT_VER, ret, &st) < 0) |
37 | { |
38 | /* /proc is not mounted or something else happened. Don't |
39 | return the file name. */ |
40 | free (ret); |
41 | ret = NULL; |
42 | } |
43 | } |
44 | return ret; |
45 | } |
46 | |