stdio_ext,__fbufsize,__fpending,__flbf,__freadable,__fwritable,__freading,__fwriting—access internals of FILE structureSynopsis
#include <stdio.h> #include <stdio_ext.h> size_t __fbufsize(FILE *fp); size_t __fpending(FILE *fp); int __flbf(FILE *fp); int __freadable(FILE *fp); int __fwritable(FILE *fp); int __freading(FILE *fp); int __fwriting(FILE *fp);
Description
These functions provides access to the internals of the FILE structure fp.
Returns
__fbufsize returns the number of bytes in the buffer of stream fp.
__fpending returns the number of bytes in the output buffer of stream fp.
__flbf returns nonzero if stream fp is line-buffered, and 0 if not.
__freadable returns nonzero if stream fp may be read, and 0 if not.
__fwritable returns nonzero if stream fp may be written, and 0 if not.
__freading returns nonzero if stream fp if the last operation on
it was a read, or if it read-only, and 0 if not.
__fwriting returns nonzero if stream fp if the last operation on
it was a write, or if it write-only, and 0 if not.
Portability
These functions originate from Solaris and are also provided by GNU libc.
No supporting OS subroutines are required.