redhat man page for fpurge

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

NAME
       fpurge, __fpurge - purge a stream

SYNOPSIS
       /* unsupported */
       #include <stdio.h>

       int fpurge(FILE *stream);

       /* supported */
       #include <stdio.h>
       #include <stdio_ext.h>

       void  __fpurge(FILE *stream);

DESCRIPTION
       The  function  fpurge()	clears the buffers of the given stream.  For output streams this discards any unwritten output.  For input streams
       this discards any input read from the underlying object but not yet obtained via getc(3); this includes any text pushed back via  ungetc().
       See also fflush(3).

       The function __fpurge() does precisely the same, but without returning a value.

RETURN VALUE
       Upon successful completion fpurge() returns 0.  On error, it returns -1 and sets errno appropriately.

ERRORS
       EBADF  stream is not an open stream.

CONFORMING TO
       These  functions  are nonstandard and not portable.  The function fpurge() was introduced in BSD 4.4 and is not available under Linux.  The
       function __fpurge() was introduced in Solaris, and is present in glibc 2.1.95 and later.

NOTES
       Usually it is a mistake to want to discard input buffers.

SEE ALSO
       fclean(3), fflush(3), setbuf(3), stdio_ext(3)

								    2001-12-15								 FPURGE(3)