Originální popis anglicky:
fflush - flush a stream
Návod, kniha: Linux Programmer's Manual
#include <stdio.h>
int fflush(FILE *stream);
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).
Upon successful completion 0 is returned. Otherwise,
EOF is returned and
the global variable
errno is set to indicate the error.
- 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).
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).
The function
fflush() conforms to ANSI X3.159-1989 (``ANSI C'').
fsync(2),
sync(2),
write(2),
fclose(3),
fopen(3),
setbuf(3),
unlocked_stdio(3)
