mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
a294460257
startup time of FreeBSD, not since the UNIX Epoch. PR: docs/122359 Submitted by: Viktor Štujber MFC after: 1 week
146 lines
3.6 KiB
Groff
146 lines
3.6 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)times.3 8.1 (Berkeley) 6/4/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd December 1, 2008
|
|
.Dt TIMES 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm times
|
|
.Nd process times
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In sys/times.h
|
|
.Ft clock_t
|
|
.Fn times "struct tms *tp"
|
|
.Sh DESCRIPTION
|
|
.Bf -symbolic
|
|
This interface is obsoleted by
|
|
.Xr getrusage 2
|
|
and
|
|
.Xr gettimeofday 2 .
|
|
.Ef
|
|
.Pp
|
|
The
|
|
.Fn times
|
|
function returns the value of time in
|
|
.Dv CLK_TCK Ns 's
|
|
of a second since the system startup time.
|
|
The current value of
|
|
.Dv CLK_TCK ,
|
|
the frequency of the statistics clock in ticks per second, may be
|
|
obtained through the
|
|
.Xr sysconf 3
|
|
interface.
|
|
.Pp
|
|
It also fills in the structure pointed to by
|
|
.Fa tp
|
|
with time-accounting information.
|
|
.Pp
|
|
The
|
|
.Vt tms
|
|
structure is defined as follows:
|
|
.Bd -literal -offset indent
|
|
struct tms {
|
|
clock_t tms_utime;
|
|
clock_t tms_stime;
|
|
clock_t tms_cutime;
|
|
clock_t tms_cstime;
|
|
};
|
|
.Ed
|
|
.Pp
|
|
The elements of this structure are defined as follows:
|
|
.Bl -tag -width ".Va tms_cutime"
|
|
.It Va tms_utime
|
|
The
|
|
.Tn CPU
|
|
time charged for the execution of user instructions.
|
|
.It Va tms_stime
|
|
The
|
|
.Tn CPU
|
|
time charged for execution by the system on behalf of
|
|
the process.
|
|
.It Va tms_cutime
|
|
The sum of the
|
|
.Va tms_utime Ns s
|
|
and
|
|
.Va tms_cutime Ns s
|
|
of the child processes.
|
|
.It Va tms_cstime
|
|
The sum of the
|
|
.Fa tms_stime Ns s
|
|
and
|
|
.Fa tms_cstime Ns s
|
|
of the child processes.
|
|
.El
|
|
.Pp
|
|
All times are in
|
|
.Dv CLK_TCK Ns 's
|
|
of a second.
|
|
.Pp
|
|
The times of a terminated child process are included in the
|
|
.Va tms_cutime
|
|
and
|
|
.Va tms_cstime
|
|
elements of the parent when one of the
|
|
.Xr wait 2
|
|
functions returns the process ID of the terminated child to the parent.
|
|
If an error occurs,
|
|
.Fn times
|
|
returns the value
|
|
.Pq Po Vt clock_t Pc Ns \-1 ,
|
|
and sets
|
|
.Va errno
|
|
to indicate the error.
|
|
.Sh ERRORS
|
|
The
|
|
.Fn times
|
|
function
|
|
may fail and set the global variable
|
|
.Va errno
|
|
for any of the errors specified for the library
|
|
routines
|
|
.Xr getrusage 2
|
|
and
|
|
.Xr gettimeofday 2 .
|
|
.Sh SEE ALSO
|
|
.Xr time 1 ,
|
|
.Xr getrusage 2 ,
|
|
.Xr gettimeofday 2 ,
|
|
.Xr wait 2 ,
|
|
.Xr sysconf 3 ,
|
|
.Xr clocks 7
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn times
|
|
function
|
|
conforms to
|
|
.St -p1003.1-88 .
|