fpurge(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

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

NAME         top

       fpurge, __fpurge - purge a stream

SYNOPSIS         top

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

       int fpurge(FILE *stream);

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

       void  __fpurge(FILE *stream);

DESCRIPTION         top

       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         top

       Upon successful completion fpurge() returns 0.  On error, it
       returns -1 and sets errno to indicate the error.

ERRORS         top

       EBADF  stream is not an open stream.

ATTRIBUTES         top

       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         top

       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         top

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

SEE ALSO         top

       fflush(3), setbuf(3), stdio_ext(3)

COLOPHON         top

       This page is part of release 5.12 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/.

                               2021-03-22                      FPURGE(3)

Pages that refer to this page: fflush(3)stdio(3)stdio_ext(3)