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Man Pages
FFLUSH(3) FreeBSD Library Functions Manual FFLUSH(3)

fflush, fpurge
flush a stream

Standard C Library (libc, -lc)

#include <stdio.h>
int
fflush(FILE *stream);
int
fpurge(FILE *stream);

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.
The function fpurge() erases any input or output buffered in the given stream. For output streams this discards any unwritten output. For input streams this discards any input read from the underlying object but not yet obtained via getc(3); this includes any text pushed back via ungetc(3).

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

[]
The stream argument is not an open stream.
The function fflush() may also fail and set errno for any of the errors specified for the routine write(2), except that in case of stream being a read-only descriptor, fflush() returns 0.

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

The fflush() function conforms to ISO/IEC 9899:1990 (“ISO C90”).
December 25, 2017 FreeBSD 12.0-RELEASE

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