clock.h

著名的AT&T UNIX v6 源码

/*
  VAX clock registers
 */

#define ICCS_RUN 0x1
#define ICCS_TRANS 0x10
#define ICCS_SS 0x20
#define ICCS_IE 0x40
#define ICCS_INT 0x80
#define ICCS_ERR 0x80000000
 
# define YRCURR  1979  /*  current year */
# define YRREF   1970  /*  reference year for time */
# define SECHR  (60*60)  /* seconds/hr */
# define SECDAY  (24*SECHR)  /* seconds/day */
# define SECYR  (365*SECDAY) /* seconds/common year */