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LETTERfflushULETTER Write and flush file output buffer.

Overview
#include <stdio.h>

r = fflush(fp);

int r; // result
FILE *fp; // file pointer

Portability
ANSI

Description
Any data currently in the file's buffers will be written and the buffers will be cleared. "fflush" has no effect on input file handles. Pass a zero as argument and all currently open files will be flushed.

Returns
If an error occured, -1 ("EOF") returned. The error code can then be found in the "errno" variable.

See also
fclose , fopen , setbuf , setvbuf