fflush(3) — Справочная страница Linux

fflush(3)               Library Functions Manual               fflush(3)

НАЗВАНИЕ

       fflush - flush a stream

БИБЛИОТЕКА

       Standard C library (libc, -lc)

СИНТАКСИС

       #include <stdio.h>

       int fflush(FILE *_Nullable stream);

ОПИСАНИЕ

       For output streams, fflush() forces a write of all user-space
       buffered data for the given output or update stream via the
       stream's underlying write function.

       For input streams associated with seekable files (e.g., disk
       files, but not pipes or terminals), fflush() discards any
       buffered data that has been fetched from the underlying file, but
       has not been consumed by the application.

       The open status of the stream is unaffected.

       If the stream argument is NULL, fflush() flushes all open output
       streams.

       For a nonlocking counterpart, see unlocked_stdio(3).

ЗНАЧЕНИЕ, ВОЗВРАЩАЕМОЕ ФУНКЦИЕЙ

       Upon successful completion 0 is returned.  Otherwise, EOF is
       returned and errno is set to indicate the error.

ОШИБКИ

       EBADF  stream is not an open stream, or is not open for writing.

       The function fflush() may also fail and set errno for any of the
       errors specified for write(2).

АТРИБУТЫ

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

СТАНДАРТЫ

       C11, POSIX.1-2008.

ИСТОРИЯ

       C89, POSIX.1-2001, POSIX.1-2008.

       POSIX.1-2001 did not specify the behavior for flushing of input
       streams, but the behavior is specified in POSIX.1-2008.

ПРИМЕЧАНИЯ

       Note that fflush() flushes only the user-space buffers provided
       by the C library.  To ensure that the data is physically stored
       on disk the kernel buffers must be flushed too, for example, with
       sync(2) or fsync(2).

СМОТРИТЕ ТАКЖЕ

       fsync(2), sync(2), write(2), fclose(3), fileno(3), fopen(3),
       fpurge(3), setbuf(3), unlocked_stdio(3)

КОЛОФОН

       This page is part of the man-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-6.9.1.tar.gz
       fetched from
       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
       2024-06-26.  If you discover any rendering problems in this HTML
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       man-pages@man7.org

Linux man-pages 6.9.1          2024-05-02                      fflush(3)

Страницы, которые ссылаются на эту страницу: fsync(2), fclose(3), fcloseall(3), fmemopen(3), fopen(3), fpurge(3), fseek(3), open_memstream(3), popen(3), setbuf(3), stdin(3), stdio(3), xdr(3)