V7/usr/include/sys/times.h

Find at most related files.
including files from this version of Unix. 
/*
 * Structure returned by times()
 */
struct tms {
	time_t	tms_utime;		/* user time */
	time_t	tms_stime;		/* system time */
	time_t	tms_cutime;		/* user time, children */
	time_t	tms_cstime;		/* system time, children */
};