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FCLOSE(3) Linux Programmer's Manual FCLOSE(3)
NAME
fcloseall - close all open streams
SYNOPSIS
#define_GNU_SOURCE
#include<stdio.h>
intfcloseall(void);
DESCRIPTION
The fcloseall function dissociates all open streams from its underlying
file or set of functions. Any buffered output data is written first,
using fflush(3). Note that the standard streams (stdin, stdout and
stderr) are also closed.
RETURNVALUE
This function always returns 0.
SEEALSO
fclose(3), close(2), fflush(3), fopen(3), setbuf(3)
CONFORMINGTO
The fcloseall function is a GNU extension.
GNU 1998-04-10 FCLOSE(3)
Take our 
