Edit: stdio_ext.h
/* Functions to access FILE structure internals. Copyright (C) 2000-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ /* This header contains the same definitions as the header of the same name on Sun's Solaris OS. */ #ifndef _STDIO_EXT_H #define _STDIO_EXT_H 1 #include <stdio.h> enum { /* Query current state of the locking status. */ FSETLOCKING_QUERY = 0, #define FSETLOCKING_QUERY FSETLOCKING_QUERY /* The library protects all uses of the stream functions, except for uses of the *_unlocked functions, by calls equivalent to flockfile(). */ FSETLOCKING_INTERNAL, #define FSETLOCKING_INTERNAL FSETLOCKING_INTERNAL /* The user will take care of locking. */ FSETLOCKING_BYCALLER #define FSETLOCKING_BYCALLER FSETLOCKING_BYCALLER }; __BEGIN_DECLS /* Return the size of the buffer of FP in bytes currently in use by the given stream. */ extern size_t __fbufsize (FILE *__fp) __THROW; /* Return non-zero value iff the stream FP is opened readonly, or if the last operation on the stream was a read operation. */ extern int __freading (FILE *__fp) __THROW; /* Return non-zero value iff the stream FP is opened write-only or append-only, or if the last operation on the stream was a write operation. */ extern int __fwriting (FILE *__fp) __THROW; /* Return non-zero value iff stream FP is not opened write-only or append-only. */ extern int __freadable (FILE *__fp) __THROW; /* Return non-zero value iff stream FP is not opened read-only. */ extern int __fwritable (FILE *__fp) __THROW; /* Return non-zero value iff the stream FP is line-buffered. */ extern int __flbf (FILE *__fp) __THROW; /* Discard all pending buffered I/O on the stream FP. */ extern void __fpurge (FILE *__fp) __THROW; /* Return amount of output in bytes pending on a stream FP. */ extern size_t __fpending (FILE *__fp) __THROW; /* Flush all line-buffered files. */ extern void _flushlbf (void); /* Set locking status of stream FP to TYPE. */ extern int __fsetlocking (FILE *__fp, int __type) __THROW; __END_DECLS #endif /* stdio_ext.h */
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