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fpurge(3) — Linux manual page

fpurge(3)                Library Functions Manualfpurge(3)

NAME        top

       fpurge, __fpurge - purge a stream

LIBRARY        top

       Standard C library (libc,-lc)

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 functionfpurge() 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 viagetc(3); this includes any text pushed       back viaungetc(3).  See alsofflush(3).       The function__fpurge() does precisely the same, but without       returning a value.

RETURN VALUE        top

       Upon successful completionfpurge() returns 0.  On error, it       returns -1 and setserrno to indicate the error.

ERRORS        top

EBADFstream is not an open stream.

ATTRIBUTES        top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────┬───────────────┬─────────────────────┐       │Interface│Attribute│Value│       ├──────────────────────────┼───────────────┼─────────────────────┤       │__fpurge()               │ Thread safety │ MT-Safe race:stream │       └──────────────────────────┴───────────────┴─────────────────────┘

STANDARDS        top

       None.

HISTORY        top

fpurge()              4.4BSD.  Not available under Linux.__fpurge()              Solaris, glibc 2.1.95.

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 theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17fpurge(3)

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

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