common/ktli/t_kalloc.c

	t_kalloc.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 1997 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

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

/*
 * Kernel TLI-like function to allocate memory for the various TLI
 * primitives.
 *
 * Returns 0 on success or a positive error value.  On success, ptr is
 * set the structure required.
 */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/user.h>
#include <sys/stream.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <sys/stropts.h>
#include <sys/tihdr.h>
#include <sys/timod.h>
#include <sys/tiuser.h>
#include <sys/errno.h>
#include <sys/signal.h>
#include <sys/t_kuser.h>
#include <sys/kmem.h>
#include <sys/sysmacros.h>

static void _alloc_buf(struct netbuf *, t_scalar_t);

int
t_kalloc(TIUSER *tiptr, int struct_type, int fields, char **ptr)
{
    union structptrs {
        char *caddr;
        struct t_bind *bind;
        struct t_call *call;
        struct t_discon *dis;
        struct t_optmgmt *opt;
        struct t_kunitdata *udata;
        struct t_uderr *uderr;
        struct t_info *info;
    } p;
    t_scalar_t dsize;

    if (ptr == NULL)
        return (EINVAL);

    /*
     * allocate appropriate structure and the specified
     * fields within each structure.  Initialize the
     * 'buf' and 'maxlen' fields of each.
     */
    switch (struct_type) {
    case T_BIND:
        p.bind = kmem_zalloc(sizeof (struct t_bind), KM_SLEEP);
        if (fields & T_ADDR)
            _alloc_buf(&p.bind->addr, tiptr->tp_info.addr);
        *ptr = ((char *)p.bind);
        return (0);

    case T_CALL:
        p.call = kmem_zalloc(sizeof (struct t_call), KM_SLEEP);
        if (fields & T_ADDR)
            _alloc_buf(&p.call->addr, tiptr->tp_info.addr);
        if (fields & T_OPT)
            _alloc_buf(&p.call->opt, tiptr->tp_info.options);
        if (fields & T_UDATA) {
            dsize = MAX(tiptr->tp_info.connect,
                tiptr->tp_info.discon);
            _alloc_buf(&p.call->opt, dsize);
        }
        *ptr = ((char *)p.call);
        return (0);

    case T_OPTMGMT:
        p.opt = kmem_zalloc(sizeof (struct t_optmgmt), KM_SLEEP);
        if (fields & T_OPT)
            _alloc_buf(&p.opt->opt, tiptr->tp_info.options);
        *ptr = ((char *)p.opt);
        return (0);

    case T_DIS:
        p.dis = kmem_zalloc(sizeof (struct t_discon), KM_SLEEP);
        if (fields & T_UDATA)
            _alloc_buf(&p.dis->udata, tiptr->tp_info.discon);
        *ptr = ((char *)p.dis);
        return (0);

    case T_UNITDATA:
        p.udata = kmem_zalloc(sizeof (struct t_kunitdata), KM_SLEEP);
        if (fields & T_ADDR)
            _alloc_buf(&p.udata->addr, tiptr->tp_info.addr);
        else
            p.udata->addr.maxlen = p.udata->addr.len = 0;

        if (fields & T_OPT)
            _alloc_buf(&p.udata->opt, tiptr->tp_info.options);
        else
            p.udata->opt.maxlen = p.udata->opt.len = 0;

        if (fields & T_UDATA) {
            p.udata->udata.udata_mp = NULL;
            p.udata->udata.buf = NULL;
            p.udata->udata.maxlen = tiptr->tp_info.tsdu;
            p.udata->udata.len = 0;
        } else {
            p.udata->udata.maxlen = p.udata->udata.len = 0;
        }
        *ptr = (char *)p.udata;
        return (0);

    case T_UDERROR:
        p.uderr = kmem_zalloc(sizeof (struct t_uderr), KM_SLEEP);
        if (fields & T_ADDR)
            _alloc_buf(&p.uderr->addr, tiptr->tp_info.addr);
        if (fields & T_OPT)
            _alloc_buf(&p.uderr->opt, tiptr->tp_info.options);
        *ptr = (char *)p.uderr;
        return (0);

    case T_INFO:
        p.info = kmem_zalloc(sizeof (struct t_info), KM_SLEEP);
        *ptr = (char *)p.info;
        return (0);

    default:
        return (EINVAL);
    }
}


static void
_alloc_buf(struct netbuf *buf, t_scalar_t n)
{
    switch (n) {
    case -1:
        buf->buf = kmem_zalloc(1024, KM_SLEEP);
        buf->maxlen = 1024;
        buf->len = 0;
        break;

    case 0:
    case -2:
        buf->buf = NULL;
        buf->maxlen = 0;
        buf->len = 0;
        break;

    default:
        buf->buf = kmem_zalloc(n, KM_SLEEP);
        buf->maxlen = n;
        buf->len = 0;
        break;
    }
}