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glibc  2.9
fd_to_filename.h
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00001 /* Query filename corresponding to an open FD.  Linux version.
00002    Copyright (C) 2001 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <stdlib.h>
00021 #include <string.h>
00022 #include <sys/stat.h>
00023 #include <stdio-common/_itoa.h>
00024 
00025 static inline const char *
00026 fd_to_filename (int fd)
00027 {
00028   char *ret = malloc (30);
00029 
00030   if (ret != NULL)
00031     {
00032       struct stat64 st;
00033 
00034       *_fitoa_word (fd, __stpcpy (ret, "/proc/self/fd/"), 10, 0) = '\0';
00035 
00036       /* We must make sure the file exists.  */
00037       if (__lxstat64 (_STAT_VER, ret, &st) < 0)
00038        {
00039          /* /proc is not mounted or something else happened.  Don't
00040             return the file name.  */
00041          free (ret);
00042          ret = NULL;
00043        }
00044     }
00045   return ret;
00046 }