TIMES(3) | Library Functions Manual | TIMES(3) |
times
—
#include <sys/times.h>
clock_t
times
(struct
tms *tp);
The times
() function returns the value of
time in clock ticks since 0 hours, 0 minutes, 0 seconds, January 1, 1970,
Coordinated Universal Time (UTC).
The number of clock ticks per second may be determined by calling
sysconf(3) with the
_SC_CLK_TCK
request. It is generally (but not
always) between 60 and 1024.
Note that at the common rate of 100 ticks per second on many NetBSD ports, and with a 32-bit unsigned clock_t, this value first wrapped in 1971.
The times
() call also fills in the
structure pointed to by tp with time-accounting
information.
The tms structure is defined as follows:
typedef struct { clock_t tms_utime; clock_t tms_stime; clock_t tms_cutime; clock_t tms_cstime; }
The elements of this structure are defined as follows:
All times are measured in clock ticks, as defined above. Note that at 100 ticks per second, and with a 32-bit unsigned clock_t, the values wrap after 497 days.
The times of a terminated child process are included in the
tms_cutime and tms_cstime
elements of the parent when one of the
wait(2) functions returns the
process ID of the terminated child to the parent. If an error occurs,
times
() returns the value ((clock_t)-1), and sets
errno to indicate the error.
times
() function may fail and set the global
variable errno for any of the errors specified for the
library routines getrusage(2)
and gettimeofday(2).
times
() function conforms to IEEE
Std 1003.1-1990 (“POSIX.1”).
June 4, 1993 | NetBSD 9.2 |