1/* Functions to access FILE structure internals.
2   Copyright (C) 2000, 2001 Free Software Foundation, Inc.
3   This file is part of the GNU C Library.
4
5   The GNU C Library is free software; you can redistribute it and/or
6   modify it under the terms of the GNU Lesser General Public
7   License as published by the Free Software Foundation; either
8   version 2.1 of the License, or (at your option) any later version.
9
10   The GNU C Library is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public
16   License along with the GNU C Library; if not, write to the Free
17   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18   02111-1307 USA.  */
19
20/* This header contains the same definitions as the header of the same name
21   on Sun's Solaris OS.  */
22
23#ifndef _STDIO_EXT_H
24#define _STDIO_EXT_H	1
25
26#include <stdio.h>
27
28enum
29{
30  /* Query current state of the locking status.  */
31  FSETLOCKING_QUERY = 0,
32#define FSETLOCKING_QUERY	FSETLOCKING_QUERY
33  /* The library protects all uses of the stream functions, except for
34     uses of the *_unlocked functions, by calls equivalent to flockfile().  */
35  FSETLOCKING_INTERNAL,
36#define FSETLOCKING_INTERNAL	FSETLOCKING_INTERNAL
37  /* The user will take care of locking.  */
38  FSETLOCKING_BYCALLER
39#define FSETLOCKING_BYCALLER	FSETLOCKING_BYCALLER
40};
41
42
43__BEGIN_DECLS
44
45/* Return the size of the buffer of FP in bytes currently in use by
46   the given stream.  */
47extern size_t __fbufsize (FILE *__fp);
48
49
50/* Return non-zero value iff the stream FP is opened readonly, or if the
51   last operation on the stream was a read operation.  */
52extern int __freading (FILE *__fp);
53
54/* Return non-zero value iff the stream FP is opened write-only or
55   append-only, or if the last operation on the stream was a write
56   operation.  */
57extern int __fwriting (FILE *__fp);
58
59
60/* Return non-zero value iff stream FP is not opened write-only or
61   append-only.  */
62extern int __freadable (FILE *__fp);
63
64/* Return non-zero value iff stream FP is not opened read-only.  */
65extern int __fwritable (FILE *__fp);
66
67
68/* Return non-zero value iff the stream FP is line-buffered.  */
69extern int __flbf (FILE *__fp);
70
71
72/* Discard all pending buffered I/O on the stream FP.  */
73extern void __fpurge (FILE *__fp);
74
75/* Return amount of output in bytes pending on a stream FP.  */
76extern size_t __fpending (FILE *__fp);
77
78/* Flush all line-buffered files.  */
79extern void _flushlbf (void);
80
81
82/* Set locking status of stream FP to TYPE.  */
83extern int __fsetlocking (FILE *__fp, int __type);
84
85__END_DECLS
86
87#endif	/* stdio_ext.h */
88