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
121 lines
3.6 KiB
Groff
121 lines
3.6 KiB
Groff
.\" $NetBSD: sigprocmask.2,v 1.22 2006/01/07 20:11:30 kleink Exp $
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.\"
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.\" Copyright (c) 1983, 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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.\" @(#)sigprocmask.2 8.1 (Berkeley) 6/4/93
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.\"
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.Dd June 4, 1993
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.Dt SIGPROCMASK 2
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.Os
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.Sh NAME
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.Nm sigprocmask
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.Nd manipulate current signal mask
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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 sigprocmask "int how" "const sigset_t * restrict set" "sigset_t * restrict oset"
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.Sh DESCRIPTION
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The
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.Fn sigprocmask
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function examines and/or changes the current signal mask (those signals
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that are blocked from delivery).
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Signals are blocked if they are members of the current signal mask set.
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.Pp
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If
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.Fa set
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is not null, the action of
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.Fn sigprocmask
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depends on the value of the parameter
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.Fa how .
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The signal mask is changed as a function of the specified
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.Fa set
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and the current mask.
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The function is specified by
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.Fa how
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using one of the following values:
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.Bl -tag -width SIG_UNBLOCK
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.It Dv SIG_BLOCK
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The new mask is the union of the current mask and the specified
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.Fa set .
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.It Dv SIG_UNBLOCK
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The new mask is the intersection of the current mask
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and the complement of the specified
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.Fa set .
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.It Dv SIG_SETMASK
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The current mask is replaced by the specified
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.Fa set .
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.El
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.Pp
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If
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.Fa oset
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is not null, it is set to
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the previous value of the signal mask.
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.Pp
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When
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.Fa set
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is null,
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the value of
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.Ar how
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is insignificant and the mask remains unset
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providing a way to examine the signal mask without modification.
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.Pp
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The system
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quietly disallows
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.Dv SIGKILL
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or
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.Dv SIGSTOP
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to be blocked.
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.Sh RETURN VALUES
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A 0 value indicates that the call succeeded.
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A \-1 return value indicates an error occurred and
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.Va errno
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is set to indicate the reason.
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.Sh ERRORS
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The
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.Fn sigprocmask
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call will fail and the signal mask will be unchanged if one
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of the following occurs:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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.Fa how
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has a value other than those listed here.
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.El
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.Sh SEE ALSO
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.Xr kill 2 ,
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.Xr sigaction 2 ,
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.Xr sigsuspend 2 ,
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.Xr pthread_sigmask 3 ,
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.Xr sigsetops 3 ,
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.Xr signal 7
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.Sh STANDARDS
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The
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.Fn sigprocmask
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function conforms to
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.St -p1003.1-90 .
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