HP-UX Reference (11i v1 05/09) - 2 System Calls (vol 5)

times(2) times(2)

NAME

times - get process and child process times

SYNOPSIS

#include <sys/times.h>

clock_t times(struct tms *buffer);

DESCRIPTION

times() ﬁlls the structure pointed to by buffer with time-accounting information. The structure deﬁned

in <

sys/times.h > is as follows:

struct tms {

clock_t tms_utime; /* user time */

clock_t tms_stime; /* system time */"

clock_t tms_cutime; /* user time, children */

clock_t tms_cstime; /* system time, children */

};

This information comes from the calling process and each of its terminated child processes for which it has

executed a wait(), wait3(),orwaitpid() . The times are in units of 1/

CLK_TCK seconds, where

CLK_TCK is processor dependent The value of CLK_TCK can be queried using the sysconf() function

(see sysconf(2)).

tms_utime is the CPU time used while executing instructions in the user space of the calling process.

tms_stime is the CPU time used by the system on behalf of the calling process.

tms_cutime is the sum of the tms_utimes and tms_cutimes of the child processes.

tms_cstime is the sum of the tms_stimes and tms_cstimes of the child processes.

RETURN VALUE

Upon successful completion, times() returns the elapsed real time, in units of 1/ CLK_TCK of a second,

since an arbitrary point in the past (such as system start-up time). This point does not change from one

invocation of

times() to another. If times() fails, −1 is returned and errno is set to indicate the

error.

Remarks

times() has a granularity of one tick. Processes which run less than one tick may not register any value.

ERRORS

[EFAULT] times() fails if buffer points to an illegal address. The reliable detection of this error is

implementation dependent.