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 to indicate the error.

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)

                                                                               2021-03-22                                                                      FPURGE(3)