FFLUSH

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
ERRORS
SEE ALSO
CONFORMING TO

NAME

fflush − flush a stream

SYNOPSIS

#include <stdio.h>

int fflush(FILE *stream);

DESCRIPTION

The function fflush forces a write of all 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.

RETURN VALUES

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).

SEE ALSO

write(2), fopen(3), fclose(3), setbuf(3)

CONFORMING TO

The fflush function conforms to ANSI C3.159-1989 (‘‘ANSI C’’).