glibc (2.38)
1 /* Functions to access FILE structure internals.
2 Copyright (C) 2000-2023 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, see
17 <https://www.gnu.org/licenses/>. */
18
19 /* This header contains the same definitions as the header of the same name
20 on Sun's Solaris OS. */
21
22 #ifndef _STDIO_EXT_H
23 #define _STDIO_EXT_H 1
24
25 #include <stdio.h>
26
27 enum
28 {
29 /* Query current state of the locking status. */
30 FSETLOCKING_QUERY = 0,
31 #define FSETLOCKING_QUERY FSETLOCKING_QUERY
32 /* The library protects all uses of the stream functions, except for
33 uses of the *_unlocked functions, by calls equivalent to flockfile(). */
34 FSETLOCKING_INTERNAL,
35 #define FSETLOCKING_INTERNAL FSETLOCKING_INTERNAL
36 /* The user will take care of locking. */
37 FSETLOCKING_BYCALLER
38 #define FSETLOCKING_BYCALLER FSETLOCKING_BYCALLER
39 };
40
41
42 __BEGIN_DECLS
43
44 /* Return the size of the buffer of FP in bytes currently in use by
45 the given stream. */
46 extern size_t __fbufsize (FILE *__fp) __THROW;
47
48
49 /* Return non-zero value iff the stream FP is opened readonly, or if the
50 last operation on the stream was a read operation. */
51 extern int __freading (FILE *__fp) __THROW;
52
53 /* Return non-zero value iff the stream FP is opened write-only or
54 append-only, or if the last operation on the stream was a write
55 operation. */
56 extern int __fwriting (FILE *__fp) __THROW;
57
58
59 /* Return non-zero value iff stream FP is not opened write-only or
60 append-only. */
61 extern int __freadable (FILE *__fp) __THROW;
62
63 /* Return non-zero value iff stream FP is not opened read-only. */
64 extern int __fwritable (FILE *__fp) __THROW;
65
66
67 /* Return non-zero value iff the stream FP is line-buffered. */
68 extern int __flbf (FILE *__fp) __THROW;
69
70
71 /* Discard all pending buffered I/O on the stream FP. */
72 extern void __fpurge (FILE *__fp) __THROW;
73
74 /* Return amount of output in bytes pending on a stream FP. */
75 extern size_t __fpending (FILE *__fp) __THROW;
76
77 /* Flush all line-buffered files. */
78 extern void _flushlbf (void);
79
80
81 /* Set locking status of stream FP to TYPE. */
82 extern int __fsetlocking (FILE *__fp, int __type) __THROW;
83
84 __END_DECLS
85
86 #endif /* stdio_ext.h */
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