# define SYS_F_CLOSE 20
# define SYS_F_IOCTL 21
# define SYS_F_STAT 22
+# define SYS_F_FCNTL 23
/* reasons */
# define ERR_R_SYS_LIB ERR_LIB_SYS/* 2 */
int ERR_set_mark(void);
int ERR_pop_to_mark(void);
+int ERR_clear_last_mark(void);
#ifdef __cplusplus
}