gno/usr.man/man2/times.2

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.\"     @(#)times.3	8.1 (Berkeley) 6/4/93
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.TH TIMES 2 "16 January 1997" GNO "System Calls"
.SH NAME
.BR times
\- process times
.SH SYNOPSIS
.br
#include <sys/times.h>
.sp 1
clock_t 
times (struct tms *tp);
.SH DESCRIPTION
The
.BR times 
function returns the value of time in
.BR CLK_TCK 's
of a second since
0 hours, 0 minutes, 0 seconds, January 1, 1970, Coordinated Universal
Time.
.LP
It also fills in the structure pointed to by
.I tp
with time-accounting information.
.LP
The
.I tms
structure is defined as follows:
.nf

typedef struct {
	clock_t tms_utime;
	clock_t tms_stime;
	clock_t tms_cutime;
	clock_t tms_cstime;
}
.fi
.LP
The elements of this structure are defined as follows:
.RS
.IP \fItms_utime\fR
The CPU time charged for the execution of user instructions.
.IP \fItms_stime\fR
The CPU time charged for execution by the system on behalf of
the process.
.IP \fItms_cutime\fR
The sum of the
.IR tms_utime ,
and
.IR tms_cutime
of the child processes.
.IP \fItms_cstime\fR
The sum of the
.IR tms_stime ,
and
.IR tms_cstime 
of the child processes.
.RE
.LP
All times are in
.BR CLK_TCK 's
of a second.
.LP
The times of a terminated child process are included in the
.I tms_cutime
and
.I tms_cstime
elements of the parent when one of the
.BR wait (2)
functions returns the process ID of the terminated child to the parent.
If an error occurs,
.BR times 
returns the value
.BR (clock_t)\-1 ,
and sets errno to indicate the error.
.SH ERRORS
The
.BR times 
function
may fail and set the global variable
.IR errno
for any of the errors specified for the library
routines
.BR getrusage (2)
and
.BR gettimeofday (2).
.SH SEE ALSO
.BR time (1),
.BR getrusage (2),
.BR gettimeofday (2),
.BR wait (2),
.BR clocks (7)
.SH STANDARDS
The
.BR times 
function
conforms to POSIX 1003.1-88.