fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
146 lines
3.6 KiB
Groff
146 lines
3.6 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)times.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd December 1, 2008
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.Dt TIMES 3
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.Os
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.Sh NAME
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.Nm times
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.Nd process times
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/times.h
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.Ft clock_t
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.Fn times "struct tms *tp"
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.Sh DESCRIPTION
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.Bf -symbolic
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This interface is obsoleted by
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.Xr getrusage 2
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and
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.Xr gettimeofday 2 .
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.Ef
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.Pp
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The
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.Fn times
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function returns the value of time in
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.Dv CLK_TCK Ns 's
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of a second since the system startup time.
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The current value of
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.Dv CLK_TCK ,
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the frequency of the statistics clock in ticks per second, may be
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obtained through the
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.Xr sysconf 3
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interface.
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.Pp
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It also fills in the structure pointed to by
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.Fa tp
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with time-accounting information.
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.Pp
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The
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.Vt tms
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structure is defined as follows:
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.Bd -literal -offset indent
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struct tms {
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clock_t tms_utime;
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clock_t tms_stime;
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clock_t tms_cutime;
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clock_t tms_cstime;
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};
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.Ed
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.Pp
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The elements of this structure are defined as follows:
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.Bl -tag -width ".Va tms_cutime"
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.It Va tms_utime
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The
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.Tn CPU
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time charged for the execution of user instructions.
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.It Va tms_stime
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The
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.Tn CPU
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time charged for execution by the system on behalf of
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the process.
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.It Va tms_cutime
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The sum of the
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.Va tms_utime Ns s
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and
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.Va tms_cutime Ns s
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of the child processes.
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.It Va tms_cstime
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The sum of the
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.Fa tms_stime Ns s
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and
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.Fa tms_cstime Ns s
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of the child processes.
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.El
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.Pp
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All times are in
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.Dv CLK_TCK Ns 's
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of a second.
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.Pp
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The times of a terminated child process are included in the
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.Va tms_cutime
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and
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.Va tms_cstime
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elements of the parent when one of the
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.Xr wait 2
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functions returns the process ID of the terminated child to the parent.
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If an error occurs,
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.Fn times
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returns the value
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.Pq Po Vt clock_t Pc Ns \-1 ,
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and sets
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.Va errno
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to indicate the error.
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.Sh ERRORS
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The
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.Fn times
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function
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may fail and set the global variable
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.Va errno
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for any of the errors specified for the library
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routines
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.Xr getrusage 2
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and
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.Xr gettimeofday 2 .
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.Sh SEE ALSO
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.Xr time 1 ,
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.Xr getrusage 2 ,
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.Xr gettimeofday 2 ,
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.Xr wait 2 ,
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.Xr sysconf 3 ,
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.Xr clocks 7
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.Sh STANDARDS
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The
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.Fn times
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function
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conforms to
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.St -p1003.1-88 .
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