mirror of https://code.videolan.org/videolan/vlc
82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
/*****************************************************************************
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* fdopendir.c: POSIX fdopendir replacement
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*****************************************************************************
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* Copyright © 2011 Rémi Denis-Courmont
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <dirent.h>
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DIR *fdopendir (int fd)
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{
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#ifdef F_GETFL
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/* Check read permission on file descriptor */
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int mode = fcntl (fd, F_GETFL);
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if (mode == -1 || (mode & O_ACCMODE) == O_WRONLY)
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{
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errno = EBADF;
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return NULL;
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}
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#endif
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/* Check directory file type */
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struct stat st;
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if (fstat (fd, &st))
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return NULL;
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if (!S_ISDIR (st.st_mode))
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{
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errno = ENOTDIR;
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return NULL;
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}
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/* Try to open the directory through /proc where available.
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* Not all operating systems support this. Fix your libc! */
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char path[sizeof ("/proc/self/fd/") + 3 * sizeof (int)];
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sprintf (path, "/proc/self/fd/%u", fd);
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DIR *dir = opendir (path);
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if (dir != NULL)
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{
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close (fd);
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return dir;
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}
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/* Hide impossible errors for fdopendir() */
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switch (errno)
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{
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case EACCES:
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#ifdef ELOOP
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case ELOOP:
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#endif
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case ENAMETOOLONG:
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case ENOENT:
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case EMFILE:
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case ENFILE:
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errno = EIO;
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}
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return NULL;
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}
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