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38 lines
1.3 KiB
C
38 lines
1.3 KiB
C
/* Query filename corresponding to an open FD. Linux version.
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Copyright (C) 2001-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sys/stat.h>
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#include <string.h>
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#include <_itoa.h>
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#define FD_TO_FILENAME_SIZE ((sizeof ("/proc/self/fd/") - 1) \
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+ (sizeof ("4294967295") - 1) + 1)
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static inline const char *
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fd_to_filename (unsigned int fd, char *buf)
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{
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*_fitoa_word (fd, __stpcpy (buf, "/proc/self/fd/"), 10, 0) = '\0';
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/* We must make sure the file exists. */
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struct stat64 st;
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if (__lxstat64 (_STAT_VER, buf, &st) < 0)
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/* /proc is not mounted or something else happened. */
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return NULL;
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return buf;
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}
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