117 lines
3.2 KiB
Groff
117 lines
3.2 KiB
Groff
.\" $NetBSD: raise_default_signal.3,v 1.3 2011/03/27 12:53:16 njoly Exp $
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.\"
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.\" Copyright (c) 2007 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 Luke Mewburn.
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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 September 25, 2007
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.Dt RAISE_DEFAULT_SIGNAL 3
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.Os
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.Sh NAME
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.Nm raise_default_signal
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.Nd raise the default signal handler
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.Sh LIBRARY
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.Lb libutil
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.Sh SYNOPSIS
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.In util.h
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.Ft int
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.Fo raise_default_signal
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.Fa "int sig"
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.Fc
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.Sh DESCRIPTION
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The
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.Fn raise_default_signal
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function raises the default signal handler for the signal
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.Fa sig .
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This function may be used by a user-defined signal handler router
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to ensure that a parent process receives the correct notification
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of a process termination by a signal.
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This can be used to avoid a common programming mistake
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when terminating a process from a custom
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.Dv SIGINT
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or
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.Dv SIGQUIT
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signal handler.
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.Pp
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The operations performed are:
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.Bl -enum -offset indent
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.It
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Block all signals, using
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.Xr sigprocmask 2 .
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.It
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Set the signal handler for signal
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.Fa sig
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to the default signal handler
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.Dv ( SIG_DFL ) .
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.It
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.Xr raise 3
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signal
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.Fa sig .
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.It
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Unblock signal
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.Fa sig
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to deliver it.
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.It
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Restore the original signal mask and handler,
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even if there was a failure.
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.El
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.Pp
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See
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.Xr signal 7
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for a table of signals and default actions.
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.Pp
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The
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.Fn raise_default_signal
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function should be async-signal-safe.
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.Sh RETURN VALUES
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Upon successful completion, a value of 0 is returned.
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Otherwise, a value of \-1 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
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.Fn raise_default_signal
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function may fail and set
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.Va errno
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for any of the errors specified for the functions
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.Xr sigemptyset 3 ,
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.Xr sigfillset 3 ,
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.Xr sigaddset 3 ,
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.Xr sigprocmask 2 ,
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.Xr sigaction 2 ,
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or
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.Xr raise 3 .
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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 raise 3 ,
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.Xr signal 7
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.Sh HISTORY
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The
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.Fn raise_default_signal
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function first appeared in
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.Nx 5.0 .
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