2fe8fb192f
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
112 lines
3.3 KiB
Groff
112 lines
3.3 KiB
Groff
.\" $NetBSD: time.3,v 1.15 2010/04/24 01:35:50 dholland Exp $
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.\"
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.\" Copyright (c) 1989, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the American National Standards Committee X3, on Information
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.\" Processing Systems.
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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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.\" @(#)time.3 8.1 (Berkeley) 6/4/93
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.\"
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.Dd April 23, 2010
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.Dt TIME 3
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.Os
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.Sh NAME
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.Nm time
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.Nd get time of day
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In time.h
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.Ft time_t
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.Fn time "time_t *tloc"
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.Sh DESCRIPTION
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The
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.Fn time
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function
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returns the value of time in seconds since 0 hours, 0 minutes,
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0 seconds, January 1, 1970, Coordinated Universal Time.
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.Pp
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A copy of the time value may be saved to the area indicated by the
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pointer
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.Fa tloc .
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If
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.Fa tloc
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is a
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.Dv NULL
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pointer, no value is stored.
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.Pp
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Upon successful completion,
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.Fn time
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returns the value of time.
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Otherwise a value of
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.Po
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.Po Fa time_t Pc \-1
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.Pc
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is returned and the global variable
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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The following error codes may be set in
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.Va errno :
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.Bl -tag -width Er
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.It Bq Er EFAULT
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An argument address referenced invalid memory.
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.El
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.Sh SEE ALSO
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.Xr gettimeofday 2 ,
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.Xr ctime 3
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.Sh STANDARDS
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The
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.Fn time
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function conforms to
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.St -p1003.1-90 .
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.Sh HISTORY
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A
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.Fn time
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function appeared in
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.At v2 .
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It returned a 32-bit value measuring sixtieths of a second, leading to
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rollover every 2.26 years.
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In
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.At v6 ,
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the precision of
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.Fn time
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was changed to seconds, allowing 135.6 years between rollovers.
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.Pp
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In
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.Nx 6.0
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the
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.Vt time_t
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type was changed to be 64 bits wide, including on 32-bit machines,
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making rollover a concern for the far distant future only.
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Note however that any code making the incorrect assumption that
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.Vt time_t
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is the same as
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.Vt long
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will fail on 32-bit machines in 2038.
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