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 close()                 Close File

 #include <io.h>                         Required for declarations only

 int        close(handle);
 int        handle;                      Handle referring to open file

    close() closes the file associated with the specified handle.

    Returns:    Zero if successfully closed, or -1 if an invalid file
                handle was given (in which case 'errno' is set to EBADF).

 Portability:   Not supported by ANSI standard.

   -------------------------------- Example ---------------------------------

    This example opens a file for reading and writing, then closes it.

           #include <io.h>
           #include <fcntl.h>

           int fhndl;

           main()
           {
                 fhndl = open("data",O_RDWR);
                 .
                 .
                 .
                 close(fhndl);
           }