FFLUSH - phpMan

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  sta-
       tus 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 the
       global variable 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
       the routine write(2).

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, e.g. with sync(2) or fsync(2).

CONFORMING TO
       The function fflush() conforms to ANSI X3.159-1989 (‘‘ANSI C’’).

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



BSD MANPAGE                       1993-11-29                         FFLUSH(3)

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