1/* Copyright (C) 1993-2021 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, see
16 <https://www.gnu.org/licenses/>. */
17
18#ifndef _DIRSTREAM_H
19#define _DIRSTREAM_H 1
20
21#include <sys/types.h>
22
23#include <libc-lock.h>
24
25/* Directory stream type.
26
27 The miscellaneous Unix `readdir' implementations read directory data
28 into a buffer and return `struct dirent *' pointers into it. */
29
30struct __dirstream
31 {
32 int fd; /* File descriptor. */
33
34 __libc_lock_define (, lock) /* Mutex lock for this structure. */
35
36 size_t allocation; /* Space allocated for the block. */
37 size_t size; /* Total valid data in the block. */
38 size_t offset; /* Current offset into the block. */
39
40 off_t filepos; /* Position of next entry to read. */
41
42 int errcode; /* Delayed error code. */
43
44 /* Directory block. We must make sure that this block starts
45 at an address that is aligned adequately enough to store
46 dirent entries. Using the alignment of "void *" is not
47 sufficient because dirents on 32-bit platforms can require
48 64-bit alignment. We use "long double" here to be consistent
49 with what malloc uses. */
50 char data[0] __attribute__ ((aligned (__alignof__ (long double))));
51 };
52
53#define _DIR_dirfd(dirp) ((dirp)->fd)
54
55#endif /* dirstream.h */
56