NetBSD-5.0.2/sys/compat/common/sysv_sem_14.c

/*	$NetBSD: sysv_sem_14.c,v 1.14 2008/04/28 20:23:41 martin Exp $	*/

/*-
 * Copyright (c) 1999 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center.
 *
 * 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.
 *
 * 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sysv_sem_14.c,v 1.14 2008/04/28 20:23:41 martin Exp $");

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

#ifndef SYSVSEM
#define	SYSVSEM
#endif

#include <sys/syscallargs.h>

#include <compat/sys/sem.h>

void
semid_ds14_to_native(struct semid_ds14  *osembuf, struct semid_ds *sembuf)
{

	ipc_perm14_to_native(&osembuf->sem_perm, &sembuf->sem_perm);

#define	CVT(x)	sembuf->x = osembuf->x
	CVT(sem_nsems);
	CVT(sem_otime);
	CVT(sem_ctime);
#undef CVT
}

void
native_to_semid_ds14(struct semid_ds *sembuf, struct semid_ds14 *osembuf)
{

	memset(sembuf, 0, sizeof *sembuf);
	native_to_ipc_perm14(&sembuf->sem_perm, &osembuf->sem_perm);

#define	CVT(x)	osembuf->x = sembuf->x
	CVT(sem_nsems);
	CVT(sem_otime);
	CVT(sem_ctime);
#undef CVT
}

int
compat_14_sys___semctl(struct lwp *l, const struct compat_14_sys___semctl_args *uap, register_t *retval)
{
	/* {
		syscallarg(int) semid;
		syscallarg(int) semnum;
		syscallarg(int) cmd;
		syscallarg(union __semun *) arg;
	} */
	union __semun arg;
	struct semid_ds sembuf;
	struct semid_ds14 osembuf;
	int cmd, error;
	void *pass_arg;

	cmd = SCARG(uap, cmd);

	pass_arg = get_semctl_arg(cmd, &sembuf, &arg);

	if (pass_arg != NULL) {
		error = copyin(SCARG(uap, arg), &arg, sizeof(arg));
		if (error)
			return (error);
		if (cmd == IPC_SET) {
			error = copyin(arg.buf, &osembuf, sizeof(osembuf));
			if (error)
				return (error);
			semid_ds14_to_native(&osembuf, &sembuf);
		}
	}

	error = semctl1(l, SCARG(uap, semid), SCARG(uap, semnum), cmd,
	    pass_arg, retval);

	if (error == 0 && cmd == IPC_STAT) {
		native_to_semid_ds14(&sembuf, &osembuf);
		error = copyout(&osembuf, arg.buf, sizeof(osembuf));
	}

	return (error);
}