posix 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(3).
       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.

ATTRIBUTES
       For an explanation of the terms used in this section, see attributes(7).

       +-----------+---------------+---------------------+
       |Interface  | Attribute	   | Value		 |
       +-----------+---------------+---------------------+
       |__fpurge() | Thread safety | MT-Safe race:stream |
       +-----------+---------------+---------------------+

CONFORMING TO
       These  functions  are  nonstandard and not portable.  The function fpurge() was introduced in 4.4BSD 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
       fflush(3), setbuf(3), stdio_ext(3)

COLOPHON
       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

								    2017-09-15								 FPURGE(3)