There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
151 lines
4 KiB
Groff
151 lines
4 KiB
Groff
.\" $NetBSD: times.3,v 1.15 2003/08/07 16:42:58 agc Exp $
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.\"
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.\" 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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.\"
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.Dd June 4, 1993
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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 clock ticks since 0 hours, 0
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minutes, 0 seconds, January 1, 1970, Coordinated Universal Time (UTC).
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.Pp
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The number of clock ticks per second may be determined by calling
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.Xr sysconf 3
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with the
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.Dv _SC_CLK_TCK
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request.
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It is generally (but not always) between 60 and 1024.
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.Pp
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Note that at the common rate of 100 ticks per second on many
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.Nx
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ports, and with a 32-bit unsigned clock_t, this value first wrapped in 1971.
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.Pp
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The
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.Fn times
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call 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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.Fa tms
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structure is defined as follows:
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.Bd -literal -offset indent
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typedef struct {
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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 tms_cutime
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.It Fa 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 Fa 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 Fa tms_cutime
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The sum of the
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.Fa tms_utime s
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and
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.Fa tms_cutime s
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of the child processes.
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.It Fa 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 measured in clock ticks, as defined above.
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Note that at 100 ticks per second,
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and with a 32-bit unsigned clock_t,
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the values wrap after 497 days.
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.Pp
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The times of a terminated child process are included in the
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.Fa tms_cutime
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and
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.Fa 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 (clock_t)\-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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.Sh STANDARDS
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The
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.Fn times
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function conforms to
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.St -p1003.1-90 .
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