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git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/unix/sysv/linux/fd_to_filename.h
b05e90514611396393977165c3e02e32db85822b
1 /* Query filename corresponding to an open FD. Linux version.
2 Copyright (C) 2001-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
23 #define FD_TO_FILENAME_SIZE ((sizeof ("/proc/self/fd/") - 1) \
24 + (sizeof ("4294967295") - 1) + 1)
26 static inline const char *
27 fd_to_filename (unsigned int fd
, char *buf
)
29 *_fitoa_word (fd
, __stpcpy (buf
, "/proc/self/fd/"), 10, 0) = '\0';
31 /* We must make sure the file exists. */
33 if (__lxstat64 (_STAT_VER
, buf
, &st
) < 0)
34 /* /proc is not mounted or something else happened. */