#define R_OK	4		/* Test for read permission.  */
#define W_OK	2		/* Test for write permission.  */
#define X_OK	1		/* Test for execute permission.  */
#define F_OK	0		/* Test for existence.  */
#define	EXIT_FAILURE	1	/* Failing exit status.  */
#define	EXIT_SUCCESS	0	/* Successful exit status.  */
# define EOF (-1)
   null terminator), or -1 on error or EOF.
/* Clear the error and EOF indicators for STREAM.  */
/* Return the EOF indicator for STREAM.  */