times - get process times
#include <sys/times.h>
clock_t times(struct tms *buf);times() stores the current process times in the
struct tms that buf points to. The struct tms
is as defined in <sys/times.h>:
struct tms {
clock_t tms_utime; /* user time */
clock_t tms_stime; /* system time */
clock_t tms_cutime; /* user time of children */
clock_t tms_cstime; /* system time of children */
};The tms_utime field contains the CPU time spent executing
instructions of the calling process. The tms_stime field
contains the CPU time spent executing inside the kernel while performing
tasks on behalf of the calling process.
The tms_cutime field contains the sum of the
tms_utime and tms_cutime values for all waited-for
terminated children. The tms_cstime field contains the sum of
the tms_stime and tms_cstime values for all waited-for
terminated children.
Times for terminated children (and their descendants) are added in at the moment wait(2) or waitpid(2) returns their process ID. In particular, times of grandchildren that the children did not wait for are never seen.
All times reported are in clock ticks.
times() returns the number of clock ticks that have
elapsed since an arbitrary point in the past. The return value may
overflow the possible range of type clock_t. On error,
(clock_t) -1 is returned, and errno is set to indicate
the error.