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c44a663d | 1 | /* Query filename corresponding to an open FD. Linux version. |
d614a753 | 2 | Copyright (C) 2001-2020 Free Software Foundation, Inc. |
c44a663d UD |
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 | |
41bdb6e2 AJ |
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. | |
c44a663d UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
c44a663d | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
c44a663d | 18 | |
c44a663d | 19 | #include <sys/stat.h> |
a06fc4a5 AZ |
20 | #include <string.h> |
21 | #include <_itoa.h> | |
0b727ed4 AZ |
22 | |
23 | #define FD_TO_FILENAME_SIZE ((sizeof ("/proc/self/fd/") - 1) \ | |
24 | + (sizeof ("4294967295") - 1) + 1) | |
c44a663d UD |
25 | |
26 | static inline const char * | |
0b727ed4 | 27 | fd_to_filename (unsigned int fd, char *buf) |
c44a663d | 28 | { |
0b727ed4 AZ |
29 | *_fitoa_word (fd, __stpcpy (buf, "/proc/self/fd/"), 10, 0) = '\0'; |
30 | ||
31 | /* We must make sure the file exists. */ | |
32 | struct stat64 st; | |
33 | if (__lxstat64 (_STAT_VER, buf, &st) < 0) | |
34 | /* /proc is not mounted or something else happened. */ | |
35 | return NULL; | |
36 | return buf; | |
c44a663d | 37 | } |