#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>

int main( int argc, char *argv[] ) 
{
   const char *filename = "junkfile.txt";
   FILE *fp;

   if(( fp = fopen( filename, "w+" )) == NULL ) {
      printf( "Can't open result file.\n" );
      return 1;
   }

   fcloseall();
   /*
   fclose( fp );
   fclose( stdout );
   fclose( stderr );
   fclose( stdin );
   */

   fputs( "This should not be written to the file.\n", fp );
   fprintf( stdout, "This should not be printed on the standard output stream.\n" );
   fprintf( stderr, "This should not be printed on the standard error stream.\n" );
   fgetc( stdin ); /* This should not block for input. */

   return 0;
}