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
154 lines
4.2 KiB
Groff
154 lines
4.2 KiB
Groff
.\" $NetBSD: sigtimedwait.2,v 1.7 2010/05/31 11:02:24 drochner Exp $
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.\"
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.\" Copyright (c) 2003 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Jaromir Dolecek.
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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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd May 30, 2010
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.Dt SIGTIMEDWAIT 2
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.Os
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.Sh NAME
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.Nm sigtimedwait ,
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.Nm sigwaitinfo ,
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.Nm sigwait
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.Nd wait for queued signals
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In signal.h
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.Ft int
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.Fn sigtimedwait "const sigset_t * restrict set" "siginfo_t * restrict info" "const struct timespec * restrict timeout"
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.Ft int
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.Fn sigwaitinfo "const sigset_t * restrict set" "siginfo_t * restrict info"
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.Ft int
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.Fn sigwait "const sigset_t * restrict set" "int * restrict sig"
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.Sh DESCRIPTION
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.Fn sigwaitinfo
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and
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.Fn sigwait
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return the first pending signal from the set specified by
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.Fa set .
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Should multiple signals from
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.Fa set
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be pending, the lowest numbered one is returned.
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The selection order between realtime and non-realtime signals is unspecified.
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If there is no signal from
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.Ar set
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pending at the time of the call, the calling thread
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is suspended until one of the specified signals is generated.
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.Pp
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.Fn sigtimedwait
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is exactly equal to
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.Fn sigwaitinfo ,
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except
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.Fa timeout
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specifies the maximum time interval for which the calling thread will
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be suspended.
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If
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.Fa timeout
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is zero (tv_sec == tv_nsec == 0),
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.Fn sigtimedwait
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only checks the currently pending signals and returns immediately.
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If
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.Dv NULL
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is used for
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.Fa timeout ,
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.Fn sigtimedwait
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behaves exactly like
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.Fn sigwaitinfo
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in all regards.
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.Pp
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If several threads are waiting for a given signal, exactly one of them
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returns from the signal wait when the signal is generated.
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.Pp
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Behaviour of these functions is unspecified if any of the signals in
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.Fa set
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are unblocked at the time these functions are called.
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.Sh RETURN VALUES
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Upon successful completion of
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.Fn sigtimedwait
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or
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.Fn sigwaitinfo
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.Fa info
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is updated with signal information, and the function returns the signal number.
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Otherwise, \-1 is returned and the global variable
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.Va errno
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indicates the error.
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Upon successful completion of
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.Fn sigwait
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.Fa sig
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is updated with ihe signal number, and the function returns 0.
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Otherwise, a non-zero error code is returned,
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.Sh ERRORS
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.Fn sigwaitinfo
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and
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.Fn sigwait
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always succeed.
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.Pp
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.Fn sigtimedwait
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will fail and the
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.Fa info
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pointer will remain unchanged if:
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.Bl -tag -width Er
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.It Bq Er EAGAIN
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No signal specified in
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.Fa set
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was generated in the specified
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.Fa timeout .
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.El
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.Pp
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.Fn sigtimedwait
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may also fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The specified
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.Fa timeout
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was invalid.
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.El
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.Pp
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This error is only checked if no signal from
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.Fa set
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is pending and it would be necessary to wait.
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.Sh SEE ALSO
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.Xr sigaction 2 ,
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.Xr sigprocmask 2 ,
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.Xr signal 7
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.Sh STANDARDS
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The functions
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.Fn sigtimedwait ,
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.Fn sigwaitinfo ,
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and
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.Fn sigwait
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conform to
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.St -p1003.1-2001 .
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.Sh HISTORY
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The
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.Fn sigtimedwait ,
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.Fn sigwaitinfo ,
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and
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.Fn sigwait
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functions appeared in
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.Nx 2.0 .
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