1 /* Functions to access FILE structure internals. 2 Copyright (C) 2000-2022 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 */ 87