| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* Functions to access FILE structure internals. |
| 2 | Copyright (C) 2000, 2001, 2003 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 | |
| 28 | enum |
| 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. */ |
| 47 | extern size_t __fbufsize (FILE *__fp) __THROW; |
| 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. */ |
| 52 | extern int __freading (FILE *__fp) __THROW; |
| 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. */ |
| 57 | extern int __fwriting (FILE *__fp) __THROW; |
| 58 | |
| 59 | |
| 60 | /* Return non-zero value iff stream FP is not opened write-only or |
| 61 | append-only. */ |
| 62 | extern int __freadable (FILE *__fp) __THROW; |
| 63 | |
| 64 | /* Return non-zero value iff stream FP is not opened read-only. */ |
| 65 | extern int __fwritable (FILE *__fp) __THROW; |
| 66 | |
| 67 | |
| 68 | /* Return non-zero value iff the stream FP is line-buffered. */ |
| 69 | extern int __flbf (FILE *__fp) __THROW; |
| 70 | |
| 71 | |
| 72 | /* Discard all pending buffered I/O on the stream FP. */ |
| 73 | extern void __fpurge (FILE *__fp) __THROW; |
| 74 | |
| 75 | /* Return amount of output in bytes pending on a stream FP. */ |
| 76 | extern size_t __fpending (FILE *__fp) __THROW; |
| 77 | |
| 78 | /* Flush all line-buffered files. */ |
| 79 | extern void _flushlbf (void); |
| 80 | |
| 81 | |
| 82 | /* Set locking status of stream FP to TYPE. */ |
| 83 | extern int __fsetlocking (FILE *__fp, int __type) __THROW; |
| 84 | libc_hidden_proto(__fsetlocking) |
| 85 | |
| 86 | __END_DECLS |
| 87 | |
| 88 | #endif /* stdio_ext.h */ |