port/sys/msgsys.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1988 AT&T */
/*    All Rights Reserved   */

#pragma ident   "%Z%%M% %I% %E% SMI"

#pragma weak _msgctl = msgctl
#pragma weak _msgget = msgget
#pragma weak _msgids = msgids
#pragma weak _msgsnap = msgsnap

#include "lint.h"
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/ipc_impl.h>
#include <sys/msg.h>
#include <sys/msg_impl.h>
#include <sys/syscall.h>
#include <errno.h>
#include <limits.h>

int
msgget(key_t key, int msgflg)
{
    return (syscall(SYS_msgsys, MSGGET, key, msgflg));
}

int
msgctl(int msqid, int cmd, struct msqid_ds *buf)
{
    if (cmd == IPC_SET64 || cmd == IPC_STAT64) {
        (void) __set_errno(EINVAL);
        return (-1);
    }

    return (syscall(SYS_msgsys, MSGCTL, msqid, cmd, buf));
}

int
msgctl64(int msqid, int cmd, struct msqid_ds64 *buf)
{
    if (cmd != IPC_SET64 && cmd != IPC_STAT64) {
        (void) __set_errno(EINVAL);
        return (-1);
    }

    return (syscall(SYS_msgsys, MSGCTL, msqid, cmd, buf));
}

ssize_t
__msgrcv(int msqid, void *msgp, size_t msgsz, long msgtyp, int msgflg)
{
    if (msgsz > INT_MAX) {
        sysret_t rval;
        int error;

        /*
         * We have to use __systemcall here because in the
         * 64-bit case, we need to return a long, while
         * syscall() is doomed to return an int
         */
        error = __systemcall(&rval, SYS_msgsys, MSGRCV, msqid,
            msgp, msgsz, msgtyp, msgflg);
        if (error)
            (void) __set_errno(error);
        return ((ssize_t)rval.sys_rval1);
    }
    return ((ssize_t)syscall(SYS_msgsys, MSGRCV, msqid,
        msgp, msgsz, msgtyp, msgflg));
}

int
__msgsnd(int msqid, const void *msgp, size_t msgsz, int msgflg)
{
    if (msgsz > INT_MAX) {
        sysret_t rval;
        int error;

        error = __systemcall(&rval, SYS_msgsys, MSGSND, msqid,
            msgp, msgsz, msgflg);
        if (error)
            (void) __set_errno(error);
        return ((int)rval.sys_rval1);
    }
    return (syscall(SYS_msgsys, MSGSND, msqid, msgp, msgsz, msgflg));
}

int
msgids(int *buf, uint_t nids, uint_t *pnids)
{
    return (syscall(SYS_msgsys, MSGIDS, buf, nids, pnids));
}

int
msgsnap(int msqid, void *buf, size_t bufsz, long msgtyp)
{
    return (syscall(SYS_msgsys, MSGSNAP, msqid, buf, bufsz, msgtyp));
}