NetBSD/sys/compat/common/kern_sig_13.c

/*	$NetBSD: kern_sig_13.c,v 1.2 1997/11/29 18:39:46 kleink Exp $	*/

/*-
 * Copyright (c) 1997 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Klaus Klein.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/proc.h>
#include <sys/signal.h>
#include <sys/systm.h>

#include <sys/mount.h>
#include <sys/syscallargs.h>

#include <machine/limits.h>

#include <compat/common/compat_util.h>


int
compat_13_sys_sigaltstack(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	struct sys___sigaltstack14_args ua;
	struct compat_13_sys_sigaltstack_args /* {
		syscallarg(const struct sigaltstack13 *) nss;
		syscallarg(struct sigaltstack13 *) oss;
	} */ *uap = v;
	struct sigaltstack13 tmp13;
	struct sigaltstack tmp, *nssp, *ossp;
	caddr_t sg;
	int error;

	sg = stackgap_init(p->p_emul);


	if (SCARG(uap, nss) != NULL) {
		error = copyin(SCARG(uap, nss), &tmp13,
		    sizeof(struct sigaltstack13));
		if (error != 0)
			return (error);
		
		tmp.ss_sp = tmp13.ss_sp;
		tmp.ss_size = tmp13.ss_size;
		tmp.ss_flags = tmp13.ss_flags;
		
		nssp = stackgap_alloc(&sg, sizeof(struct sigaltstack));
		error = copyout(&tmp, nssp, sizeof(struct sigaltstack));
		if (error != 0)
			return (error);
	} else
		nssp = NULL;

	if (SCARG(uap, oss) != NULL)
		ossp = stackgap_alloc(&sg, sizeof(struct sigaltstack));
	else
		ossp = NULL;

	SCARG(&ua, nss) = nssp;
	SCARG(&ua, oss) = ossp;

	error = sys___sigaltstack14(p, &ua, retval);
	if (error != 0)
		return (error);

	if (SCARG(uap, oss) != NULL) {
		error = copyin(SCARG(&ua, oss), &tmp,
		    sizeof(struct sigaltstack));
		if (error != 0)
			return (error);
		
		tmp13.ss_sp = tmp.ss_sp;
		if (tmp.ss_size > INT_MAX)
			tmp13.ss_size = INT_MAX;
		else
			tmp13.ss_size = tmp.ss_size;
		tmp13.ss_flags = tmp.ss_flags;

		error = copyout(&tmp13, SCARG(uap, oss),
		    sizeof(struct sigaltstack13));
		if (error != 0)
			return (error);
	}

	return (0);
}