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

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