/* Copyright (C) 1993-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <limits.h>

#include <stddef.h>

#include <stdlib.h>

#include <string.h>

#include <dirent.h>

#include <fcntl.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <unistd.h>

#include <stdio.h>

#include <hurd.h>

#include <hurd/fd.h>

#include <not-cancel.h>

#include "dirstream.h"

/* Open a directory stream on a file descriptor in Hurd internal form.

   We do no checking here on the descriptor.  */

DIR *

_hurd_fd_opendir (struct hurd_fd *d)

{

  DIR *dirp;

  if (d == NULL)

    {

      errno = EBADF;

      return NULL;

    }

  dirp = (DIR *) malloc (sizeof (DIR));

  if (dirp == NULL)

    return NULL;

  /* Set the descriptor to close on exec. */

  HURD_CRITICAL_BEGIN;

  __spin_lock (&d->port.lock);

  d->flags |= FD_CLOEXEC;

  __spin_unlock (&d->port.lock);

  HURD_CRITICAL_END;

  dirp->__fd = d;

  dirp->__data = dirp->__ptr = NULL;

  dirp->__entry_data = dirp->__entry_ptr = 0;

  dirp->__allocation = 0;

  dirp->__size = 0;

  __libc_lock_init (dirp->__lock);

  return dirp;

}

DIR *

__opendirat (int dfd, const char *name)

{

  if (name[0] == '\0')

    {

      /* POSIX.1-1990 says an empty name gets ENOENT;

	 but `open' might like it fine.  */

      __set_errno (ENOENT);

      return NULL;

    }

  int flags = O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC;

  int fd;

#if IS_IN (rtld)

  assert (dfd == AT_FDCWD);

  fd = __open_nocancel (name, flags);

#else

  fd = __openat_nocancel (dfd, name, flags);

#endif

  if (fd < 0)

    return NULL;

  /* Extract the pointer to the descriptor structure.  */

  DIR *dirp = _hurd_fd_opendir (_hurd_fd_get (fd));

  if (dirp == NULL)

    __close (fd);

  return dirp;

}

/* Open a directory stream on NAME.  */

DIR *

__opendir (const char *name)

{

#if 0 /* TODO.  */

  return __opendirat (AT_FDCWD, name);

#else

  if (name[0] == '\0')

    {

      /* POSIX.1-1990 says an empty name gets ENOENT;

	 but `open' might like it fine.  */

      __set_errno (ENOENT);

      return NULL;

    }

  int fd = __open (name, O_RDONLY | O_NONBLOCK | O_DIRECTORY);

  if (fd < 0)

    return NULL;

  /* Extract the pointer to the descriptor structure.  */

  DIR *dirp = _hurd_fd_opendir (_hurd_fd_get (fd));

  if (dirp == NULL)

    __close (fd);

  return dirp;

#endif

}

weak_alias (__opendir, opendir)