1.\" $NetBSD: setjmp.9,v 1.4 2008/04/30 13:10:58 martin Exp $ 2.\" 3.\" Copyright (c) 2002 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Gregory McGarry. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28.\" POSSIBILITY OF SUCH DAMAGE. 29.\" 30.Dd May 23, 2002 31.Dt SETJMP 9 32.Os 33.Sh NAME 34.Nm setjmp , 35.Nm longjmp 36.Nd non-local jumps 37.Sh SYNOPSIS 38.In machine/types.h 39.In sys/systm.h 40.Ft int 41.Fn setjmp "label_t *label" 42.Ft void 43.Fn longjmp "label_t *label" 44.Sh DESCRIPTION 45The 46.Fn setjmp 47function saves its calling environment in 48.Fa label . 49It returns zero on success. 50The 51.Fn longjmp 52function restores the environment saved by the most recent 53invocation of 54.Fn setjmp . 55It returns so that kernel execution continues as if 56the corresponding invocation of the 57.Fn setjmp 58had just returned. 59.Pp 60.Fn setjmp 61and 62.Fn longjmp 63are a machine-independent interface for machine-dependent 64implementations. 65.Pp 66These functions are primarily used by 67.Xr ddb 4 . 68.Sh SEE ALSO 69.Xr ddb 4 70