307f36e80c
ticks. Although the two are the same, SuS now says you use the former, not the latter, to get the information. Also, fill in a little information on just how awful this crusty wreck is.
154 lines
4.2 KiB
Groff
154 lines
4.2 KiB
Groff
.\" $NetBSD: times.3,v 1.12 2002/06/23 21:32:01 perry Exp $
|
|
.\"
|
|
.\" 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.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 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
|
|
.\"
|
|
.Dd June 4, 1993
|
|
.Dt TIMES 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm times
|
|
.Nd process times
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.Fd #include \*[Lt]sys/times.h\*[Gt]
|
|
.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 clock ticks since 0 hours, 0
|
|
minutes, 0 seconds, January 1, 1970, Coordinated Universal Time (UTC).
|
|
.Pp
|
|
The number of clock ticks per second may be determined by calling
|
|
.Xr sysconf 3
|
|
with the
|
|
.Dv _SC_CLK_TCK
|
|
request. It is generally (but not always) between 60 and 1024.
|
|
.Pp
|
|
Note that at the common rate of 100 ticks per second on many
|
|
.Nx
|
|
ports, and with a 32-bit unsigned clock_t, this value first wrapped in 1971.
|
|
.Pp
|
|
The
|
|
.Fn times
|
|
call also fills in the structure pointed to by
|
|
.Fa tp
|
|
with time-accounting information.
|
|
.Pp
|
|
The
|
|
.Fa tms
|
|
structure is defined as follows:
|
|
.Bd -literal -offset indent
|
|
typedef struct {
|
|
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 tms_cutime
|
|
.It Fa tms_utime
|
|
The
|
|
.Tn CPU
|
|
time charged for the execution of user instructions.
|
|
.It Fa tms_stime
|
|
The
|
|
.Tn CPU
|
|
time charged for execution by the system on behalf of
|
|
the process.
|
|
.It Fa tms_cutime
|
|
The sum of the
|
|
.Fa tms_utime s
|
|
and
|
|
.Fa tms_cutime s
|
|
of the child processes.
|
|
.It Fa 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 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.
|
|
.Pp
|
|
The times of a terminated child process are included in the
|
|
.Fa tms_cutime
|
|
and
|
|
.Fa 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 (clock_t)\-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
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn times
|
|
function conforms to
|
|
.St -p1003.1-90 .
|