_flushlbf man page on ElementaryOS

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STDIO_EXT(3)		   Linux Programmer's Manual		  STDIO_EXT(3)

NAME
       __fbufsize,  __flbf,  __fpending,  __fpurge,  __freadable,  __freading,
       __fsetlocking, __fwritable, __fwriting, _flushlbf - interfaces to stdio
       FILE structure

SYNOPSIS
       #include <stdio.h>
       #include <stdio_ext.h>

       size_t __fbufsize(FILE *stream);
       size_t __fpending(FILE *stream);
       int __flbf(FILE *stream);
       int __freadable(FILE *stream);
       int __fwritable(FILE *stream);
       int __freading(FILE *stream);
       int __fwriting(FILE *stream);
       int __fsetlocking(FILE *stream, int type);
       void _flushlbf(void);
       void __fpurge(FILE *stream);

DESCRIPTION
       Solaris	introduced  routines to allow portable access to the internals
       of the FILE structure, and glibc also implemented these.

       The __fbufsize() function returns the size of the buffer currently used
       by the given stream.

       The  __fpending()  function  returns  the number of bytes in the output
       buffer.	For wide-oriented streams the unit is wide  characters.	  This
       function is undefined on buffers in reading mode, or opened read-only.

       The  __flbf()  function	returns a nonzero value if the stream is line-
       buffered, and zero otherwise.

       The __freadable() function returns a nonzero value if the stream allows
       reading, and zero otherwise.

       The __fwritable() function returns a nonzero value if the stream allows
       writing, and zero otherwise.

       The __freading() function returns a nonzero  value  if  the  stream  is
       read-only, or if the last operation on the stream was a read operation,
       and zero otherwise.

       The __fwriting() function returns a nonzero  value  if  the  stream  is
       write-only (or append-only), or if the last operation on the stream was
       a write operation, and zero otherwise.

       The __fsetlocking() function can be used to select the desired type  of
       locking on the stream.  It returns the current type.  The type argument
       can take the following three values:

       FSETLOCKING_INTERNAL
	      Perform implicit locking around every  operation	on  the	 given
	      stream (except for the *_unlocked ones).	This is the default.

       FSETLOCKING_BYCALLER
	      The  caller will take care of the locking (possibly using flock‐
	      file(3) in case there is more than one thread),  and  the	 stdio
	      routines	will  not do locking until the state is reset to FSET‐
	      LOCKING_INTERNAL.

       FSETLOCKING_QUERY
	      Don't change the type of locking.	 (Only return it.)

       The _flushlbf() function flushes all line-buffered  streams.   (Presum‐
       ably  so	 that  output  to a terminal is forced out, say before reading
       keyboard input.)

       The __fpurge() function discards the contents of the stream's buffer.

ATTRIBUTES
   Multithreading (see pthreads(7))
       The __fbufsize(), __fpending(), __fpurge()  and	__fsetlocking()	 func‐
       tions do not lock the stream, so they are not thread-safe.

       The  __flbf(), __freadable(), __freading(), __fwritable(), __fwriting()
       and _flushlbf() functions are thread-safe.

SEE ALSO
       flockfile(3), fpurge(3)

COLOPHON
       This page is part of release 3.54 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

				  2013-06-21			  STDIO_EXT(3)
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