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 appropriately.

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 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)

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

Copyright and license for this manual page

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