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      1  1.5     joerg /*	$NetBSD: resumecontext.c,v 1.5 2011/09/19 21:24:57 joerg Exp $	*/
      2  1.2   thorpej 
      3  1.2   thorpej /*-
      4  1.2   thorpej  * Copyright (c) 2001 The NetBSD Foundation, Inc.
      5  1.2   thorpej  * All rights reserved.
      6  1.2   thorpej  *
      7  1.2   thorpej  * This code is derived from software contributed to The NetBSD Foundation
      8  1.2   thorpej  * by Klaus Klein.
      9  1.2   thorpej  *
     10  1.2   thorpej  * Redistribution and use in source and binary forms, with or without
     11  1.2   thorpej  * modification, are permitted provided that the following conditions
     12  1.2   thorpej  * are met:
     13  1.2   thorpej  * 1. Redistributions of source code must retain the above copyright
     14  1.2   thorpej  *    notice, this list of conditions and the following disclaimer.
     15  1.2   thorpej  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.2   thorpej  *    notice, this list of conditions and the following disclaimer in the
     17  1.2   thorpej  *    documentation and/or other materials provided with the distribution.
     18  1.2   thorpej  *
     19  1.2   thorpej  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.2   thorpej  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.2   thorpej  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.2   thorpej  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.2   thorpej  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.2   thorpej  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.2   thorpej  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.2   thorpej  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.2   thorpej  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.2   thorpej  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.2   thorpej  * POSSIBILITY OF SUCH DAMAGE.
     30  1.2   thorpej  */
     31  1.2   thorpej 
     32  1.2   thorpej #include <sys/cdefs.h>
     33  1.2   thorpej #if defined(LIBC_SCCS) && !defined(lint)
     34  1.5     joerg __RCSID("$NetBSD: resumecontext.c,v 1.5 2011/09/19 21:24:57 joerg Exp $");
     35  1.2   thorpej #endif
     36  1.2   thorpej 
     37  1.2   thorpej #include "namespace.h"
     38  1.2   thorpej #include <ucontext.h>
     39  1.3  drochner #include <unistd.h>
     40  1.3  drochner #include <stdlib.h>
     41  1.2   thorpej #include "extern.h"
     42  1.2   thorpej 
     43  1.2   thorpej void
     44  1.5     joerg _resumecontext(void)
     45  1.2   thorpej {
     46  1.2   thorpej 	ucontext_t uct;
     47  1.2   thorpej 
     48  1.2   thorpej 	(void)getcontext(&uct);
     49  1.3  drochner 	if (!uct.uc_link) {
     50  1.3  drochner 		exit(0);
     51  1.3  drochner 		/* NOTREACHED */
     52  1.3  drochner 	}
     53  1.3  drochner 
     54  1.2   thorpej 	(void)setcontext(uct.uc_link);
     55  1.2   thorpej 	/* NOTREACHED */
     56  1.3  drochner 
     57  1.3  drochner 	/* something is wrong, pull the brake */
     58  1.3  drochner 	_exit(-1);
     59  1.3  drochner 	/* NOTREACHED */
     60  1.2   thorpej }
     61