sysdeps/unix/dirstream.h

   1 /* Copyright (C) 1993, 1995, 1996, 2007 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _DIRSTREAM_H
  20 #define _DIRSTREAM_H    1
  21
  22 #include <sys/types.h>
  23
  24 #include <bits/libc-lock.h>
  25
  26 /* Directory stream type.
  27
  28    The miscellaneous Unix `readdir' implementations read directory data
  29    into a buffer and return `struct dirent *' pointers into it.  */
  30
  31 struct __dirstream
  32   {
  33     int fd;                     /* File descriptor.  */
  34
  35     __libc_lock_define (, lock) /* Mutex lock for this structure.  */
  36
  37     size_t allocation;          /* Space allocated for the block.  */
  38     size_t size;                /* Total valid data in the block.  */
  39     size_t offset;              /* Current offset into the block.  */
  40
  41     off_t filepos;              /* Position of next entry to read.  */
  42
  43     /* Directory block.  */
  44     char data[0] __attribute__ ((aligned (__alignof__ (void*))));
  45   };
  46
  47 #define _DIR_dirfd(dirp)        ((dirp)->fd)
  48
  49 #endif  /* dirstream.h */