TIMES(3) BSD Library Functions Manual TIMES(3)NAMEtimes — process timesLIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/times.h>
clock_t
times(struct tms *tp);
DESCRIPTION
This interface is obsoleted by getrusage(2) and gettimeofday(2).
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:
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 pro‐
cesses.
tms_cstime The sum of the tms_stimes and tms_cstimes of the child pro‐
cesses.
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.
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 ALSOtime(1), getrusage(2), gettimeofday(2), wait(2), sysconf(3)STANDARDS
The times() function conforms to ISO/IEC 9945-1:1990 (“POSIX.1”).
BSD June 4, 1993 BSD
