_fcloseall - Close All Open Streams

Syntax

#include <stdio.h>
int _fcloseall(void);

fcloseall closes all open streams, except stdin, stdout, and stderr. It also closes and deletes any temporary files created by tmpfile.
_fcloseall flushes all buffers associated with the streams before closing them. When it closes streams, it releases the buffers that the system reserved, but does not release user-allocated buffers.

fcloseall returns the total number of streams closed, or EOF if an error occurs.

This example opens a file john for reading as a data stream, and then closes the file. It closes all other streams except stdin, stdout, and stderr.

#include <stdio.h>

#define OUTFILE "temp.out"

int main(void)
{
   FILE *stream;
   int numclosed;

   stream = fopen(OUTFILE, "w");
   numclosed = _fcloseall();
   printf("Number of files closed = %d\n", numclosed);
   remove(OUTFILE);
   return 0;

   /****************************************************************************
      The output should be:

      Number of files closed = 1
   ****************************************************************************/
}

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