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/* Query filename corresponding to an open FD. Linux version.
Copyright (C) 2001-2020 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; if not, see
<https://www.gnu.org/licenses/>. */
#include <sys/stat.h>
#include <string.h>
#include <_itoa.h>
#define FD_TO_FILENAME_SIZE ((sizeof ("/proc/self/fd/") - 1) \
+ (sizeof ("4294967295") - 1) + 1)
static inline const char *
fd_to_filename (unsigned int fd, char *buf)
{
*_fitoa_word (fd, __stpcpy (buf, "/proc/self/fd/"), 10, 0) = '\0';
/* We must make sure the file exists. */
struct stat64 st;
if (__lxstat64 (_STAT_VER, buf, &st) < 0)
/* /proc is not mounted or something else happened. */
return NULL;
return buf;
}
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