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
105 lines
3.1 KiB
Groff
105 lines
3.1 KiB
Groff
.\" $NetBSD: usleep.3,v 1.19 2010/04/29 17:29:56 jruoho Exp $
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.\"
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.\" Copyright (c) 1986, 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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.\" @(#)usleep.3 8.1 (Berkeley) 6/4/93
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.\"
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.Dd April 29, 2010
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.Dt USLEEP 3
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.Os
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.Sh NAME
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.Nm usleep
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.Nd suspend execution for interval of microseconds
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In unistd.h
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.Ft int
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.Fn usleep "useconds_t microseconds"
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.Sh DESCRIPTION
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The
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.Fn usleep
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function
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suspends execution of the calling process
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until either the number of microseconds specified by
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.Fa microseconds
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have elapsed or a signal is delivered to the calling process and its
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action is to invoke a signal catching function or to terminate the
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process.
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The suspension time may be longer than requested due to the
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scheduling of other activity by the system.
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.Pp
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The
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.Fa microseconds
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argument must be less than 1,000,000.
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If the value of
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.Fa microseconds
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is 0, then the call has no effect.
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.Sh RETURN VALUES
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On successful completion,
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.Fn usleep
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returns 0.
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Otherwise, it returns \-1 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 usleep
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function may fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The
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.Fa microseconds
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interval specified 1,000,000 or more microseconds.
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.El
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.Sh SEE ALSO
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.Xr nanosleep 2 ,
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.Xr sleep 3
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.Sh STANDARDS
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The
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.Fn usleep
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function conforms to
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.St -xpg4.2 .
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It later appeared in the
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.Tn POSIX
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standard, but in
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.St -p1003.1-2004
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it was marked as legacy and the use of
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.Xr nanosleep 2
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was recommended instead.
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The
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.St -p1003.1-2008
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revision removed
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.Fn usleep
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from the specification.
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.Sh HISTORY
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The
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.Fn usleep
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function appeared in
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.Bx 4.3 .
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