/*
 * This function closes the file specified by 
 * file descriptor fd.
 */

#include <unistd.h>

int
close(int fd)
{
    /*
     *   - Check that fd is a valid descriptor
     */

    /*
     *   - Attempt to close the specified file
     */

    /*
     *   - Return 0 for ok or -1 in case of error
     */

}