1/* Query filename corresponding to an open FD. Linux version.
2 Copyright (C) 2001-2017 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
24static inline const char *
25fd_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