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a4f1763067
available, avoid stat call, use fcntl result to determine whether descriptor is for a directory or not. * dirent/Makefile (tests): Add tst-fdopendir2. * dirent/tst-fdopendir2.c: New file.
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/* Copyright (C) 2005, 2006 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <not-cancel.h>
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DIR *
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fdopendir (int fd)
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{
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struct stat64 statbuf;
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#ifndef O_DIRECTORY
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if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &statbuf), 0) < 0)
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return NULL;
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if (__builtin_expect (! S_ISDIR (statbuf.st_mode), 0))
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{
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__set_errno (ENOTDIR);
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return NULL;
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}
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#endif
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/* Make sure the descriptor allows for reading (and eventually that
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the descriptor is for a directory). */
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int flags = __fcntl (fd, F_GETFL);
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if (__builtin_expect (flags == -1, 0))
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return NULL;
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#ifdef O_DIRECTORY
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if (__builtin_expect ((flags & O_DIRECTORY) == 0, 0))
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{
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__set_errno (ENOTDIR);
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return NULL;
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}
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#endif
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if (__builtin_expect ((flags & O_ACCMODE) == O_WRONLY, 0))
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{
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__set_errno (EINVAL);
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return NULL;
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}
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return __alloc_dir (fd, false, &statbuf);
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}
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