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Man Pages


Manual Reference Pages  -  TIMES (3)

NAME

times - process times

CONTENTS

Library
Synopsis
Description
Errors
See Also
Standards

LIBRARY


.Lb libc

SYNOPSIS


.In sys/times.h clock_t times struct tms *tp

DESCRIPTION


.Bf -symbolic This interface is obsoleted by getrusage(2) and gettimeofday(2).
.Ef

The times function returns the value of time in CLK_TCK ’s of a second since the system startup time. The current value of CLK_TCK, the frequency of the statistics clock in ticks per second, may be obtained through the sysconf(3) interface.

It also fills in the structure pointed to by tp with time-accounting information.

The
.Vt tms structure is defined as follows:

struct tms {
        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:
tms_utime The CPU time charged for the execution of user instructions.
tms_stime The CPU time charged for execution by the system on behalf of the process.
tms_cutime
  The sum of the tms_utime s and tms_cutime s of the child processes.
tms_cstime
  The sum of the tms_stime s and tms_cstime s of the child processes.

All times are in CLK_TCK ’s of a second.

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 ((Vtclock_t-1)), and sets errno to indicate the error.

ERRORS

The 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).

SEE ALSO

time(1), getrusage(2), gettimeofday(2), wait(2), sysconf(3), clocks(7)

STANDARDS

The times function conforms to -p1003.1-88.
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