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glibc  2.9
fdopendir.c
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00001 /* Copyright (C) 2005, 2006 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <dirent.h>
00020 #include <errno.h>
00021 #include <fcntl.h>
00022 #include <sys/stat.h>
00023 
00024 #include <not-cancel.h>
00025 
00026 
00027 DIR *
00028 __fdopendir (int fd)
00029 {
00030   struct stat64 statbuf;
00031 
00032   if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &statbuf), 0) < 0)
00033     return NULL;
00034   if (__builtin_expect (! S_ISDIR (statbuf.st_mode), 0))
00035     {
00036       __set_errno (ENOTDIR);
00037       return NULL;
00038     }
00039 
00040   /* Make sure the descriptor allows for reading.  */
00041   int flags = __fcntl (fd, F_GETFL);
00042   if (__builtin_expect (flags == -1, 0))
00043     return NULL;
00044   if (__builtin_expect ((flags & O_ACCMODE) == O_WRONLY, 0))
00045     {
00046       __set_errno (EINVAL);
00047       return NULL;
00048     }
00049 
00050   return __alloc_dir (fd, false, &statbuf);
00051 }
00052 weak_alias (__fdopendir, fdopendir)