.\"     $NetBSD: setjmp.9,v 1.4 2008/04/30 13:10:58 martin Exp $
.\"
.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Gregory McGarry.
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.Dd May 23, 2002
.Dt SETJMP 9
.Os
.Sh NAME
.Nm setjmp ,
.Nm longjmp
.Nd non-local jumps
.Sh SYNOPSIS
.In machine/types.h
.In sys/systm.h
.Ft int
.Fn setjmp "label_t *label"
.Ft void
.Fn longjmp "label_t *label"
.Sh DESCRIPTION
The
.Fn setjmp
function saves its calling environment in
.Fa label .
It returns zero on success.
The
.Fn longjmp
function restores the environment saved by the most recent
invocation of
.Fn setjmp .
It returns so that kernel execution continues as if
the corresponding invocation of the
.Fn setjmp
had just returned.
.Pp
.Fn setjmp
and
.Fn longjmp
are a machine-independent interface for machine-dependent
implementations.
.Pp
These functions are primarily used by
.Xr ddb 4 .
.Sh SEE ALSO
.Xr ddb 4