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



NAME
       fflush - flush a stream

SYNOPSIS
       #include <stdio.h>

       int fflush(FILE *stream);

DESCRIPTION
       The  function fflush() forces a write of all user-space buffered data for the given output or update stream via
       the stream's underlying write function.  The open status of the stream is unaffected.

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

       For a non-locking counterpart, see unlocked_stdio(3).

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

ERRORS
       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).

CONFORMING TO
       C89, C99.

NOTES
       Note that fflush() only flushes 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).

SEE ALSO
       fsync(2), sync(2), write(2), fclose(3), fopen(3), setbuf(3), unlocked_stdio(3)

COLOPHON
       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



GNU                               2009-02-23                         FFLUSH(3)