[apple/xnu.git] / bsd / netat / adsp.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * Change log:
 *   06/29/95 - Modified to handle flow control for writing (Tuyen Nguyen)
 *    Modified for MP, 1996 by Tuyen Nguyen
 *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
 */
#define RESOLVE_DBG
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <machine/spl.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/filedesc.h>
#include <sys/fcntl.h>
#include <sys/mbuf.h>
#include <sys/socket.h>

#include <netat/sysglue.h>
#include <netat/appletalk.h>
#include <netat/at_pcb.h>
#include <netat/ddp.h>
#include <netat/adsp.h>
#include <netat/adsp_internal.h>

#ifdef notdefn
struct adsp_debug adsp_dtable[1025];
int ad_entry = 0;
#endif


adspAllocateCCB(gref)
    register gref_t *gref;	/* READ queue */
{
    gbuf_t *ccb_mp;
    register CCBPtr sp;

    if (!(ccb_mp = gbuf_alloc(sizeof(CCB), PRI_LO))) {
        return (0);
    }
    bzero((caddr_t) gbuf_rptr(ccb_mp), sizeof(CCB));
    gbuf_wset(ccb_mp,sizeof(CCB));
    gref->info = (caddr_t) ccb_mp;
    sp = (CCBPtr)gbuf_rptr(((gbuf_t *)gref->info));

    sp->pid = gref->pid; /* save the caller process pointer */
    sp->gref = gref;		/* save a back pointer to the WRITE queue */
    sp->sp_mp = ccb_mp;		/* and its message block */
    return 1;
}

adspRelease(gref)
    register gref_t *gref;	/* READ queue */
{
    register CCBPtr sp;

    if (gref->info) {
	sp = (CCBPtr)gbuf_rptr(((gbuf_t *)gref->info));
				/* Tells completion routine of close */
				/* packet to remove us. */

	if (sp->state == sPassive || sp->state == sClosed || 
	    sp->state == sOpening || sp->state == sListening) {
	    if (sp->state == sListening)
		CompleteQueue(&sp->opb, errAborted);
	    sp->removing = 1;	/* Prevent allowing another dspClose. */
	    DoClose(sp, errAborted, 0); /* will remove CCB */
	    return 0;
	} else {			/* sClosing & sOpen */
	    sp->state = sClosing;
	}

	if (CheckOkToClose(sp)) { /* going to close */
	    sp->sendCtl = B_CTL_CLOSE; /* Send close advice */
	} else {
		CheckSend(sp);	/* try one more time to send out data */
		if (sp->state != sClosed)
		    sp->sendCtl = B_CTL_CLOSE; /* Setup to send close advice */
	}
	CheckSend(sp);		/* and force out the close */
	    sp->removing = 1;	/* Prevent allowing another dspClose. */
	    sp->state = sClosed;
	    DoClose(sp, errAborted, 0);  /* to closed and remove CCB */
    } 
}


adspWriteHandler(gref, mp)
    gref_t *gref;			/* WRITE queue */
    gbuf_t *mp;
{

    register ioc_t *iocbp;
    register struct adspcmd *ap;
    int error, flag;
	void *sp;

    switch(gbuf_type(mp)) {
		case MSG_DATA:
		if (gref->info == 0) {
			gbuf_freem(mp);
			return(STR_IGNORE);
			}
		/*
		 * Fill in the global stuff
		 */
		ap = (struct adspcmd *)gbuf_rptr(mp);
		ap->gref = gref;
		ap->ioc = 0;
		ap->mp = mp;
		sp = (void *)gbuf_rptr(((gbuf_t *)gref->info));
		switch(ap->csCode) {
			case dspWrite:
				if ((error = adspWrite(sp, ap)))
				gbuf_freem(mp);
				return(STR_IGNORE);
			case dspAttention:
				if ((error = adspAttention(sp, ap)))
				gbuf_freem(mp);
				return(STR_IGNORE);
		}
		case MSG_IOCTL:
		if (gref->info == 0) {
			adspioc_ack(EPROTOTYPE, mp, gref);
			return(STR_IGNORE);
			}
		iocbp = (ioc_t *) gbuf_rptr(mp);
		if (ADSP_IOCTL(iocbp->ioc_cmd)) {
			iocbp->ioc_count = sizeof(*ap) - 1;
			if (gbuf_cont(mp) == 0) {
			adspioc_ack(EINVAL, mp, gref);
			return(STR_IGNORE);
			}
			ap = (struct adspcmd *) gbuf_rptr(gbuf_cont(mp));
			ap->gref = gref;
			ap->ioc = (caddr_t) mp;
			ap->mp = gbuf_cont(mp); /* request head */
			ap->ioResult = 0;
	
			if ((gref->info == 0) && ((iocbp->ioc_cmd != ADSPOPEN) &&
							(iocbp->ioc_cmd != ADSPCLLISTEN))) {
				ap->ioResult = errState;
	
			adspioc_ack(EINVAL, mp, gref);
			return(STR_IGNORE);
			}
		} else
			return(STR_PUTNEXT);	/* pass it on down */	
		sp = (void *)gbuf_rptr(((gbuf_t *)gref->info));
		switch(iocbp->ioc_cmd) {
			case ADSPOPEN:
			case ADSPCLLISTEN:
				ap->socket = ((CCBPtr)sp)->localSocket;
				flag = (adspMode(ap) == ocAccept) ? 1 : 0;
				if (flag && ap->socket) {
					if (adspDeassignSocket((CCBPtr)sp) >= 0)
						ap->socket = 0;
				}
				if ((ap->socket == 0) &&
					((ap->socket = 
					  (at_socket)adspAssignSocket(gref, flag)) == 0)) {
					adspioc_ack(EADDRNOTAVAIL, mp, gref);
					return(STR_IGNORE);
				}
				ap->csCode = iocbp->ioc_cmd == ADSPOPEN ? dspInit : dspCLInit;
				if ((error = adspInit(sp, ap)) == 0) {
				switch(ap->csCode) {
				case dspInit:
					/* and open the connection */
					ap->csCode = dspOpen;
					error = adspOpen(sp, ap);
					break;
				case dspCLInit:
					/* ADSPCLLISTEN */
					ap->csCode = dspCLListen;
					error = adspCLListen(sp, ap);
					break;
				}
				}
				if (error) 
				adspioc_ack(error, mp, gref); /* if this failed req complete */
				return(STR_IGNORE);
			case ADSPCLOSE:
				ap->csCode = dspClose;
				if ((error = adspClose(sp, ap))) {
				adspioc_ack(error, mp, gref);
				break;
				}
				break;
			case ADSPCLREMOVE:
				ap->csCode = dspCLRemove;
				error = adspClose(sp, ap);
				adspioc_ack(error, mp, gref);
				return(STR_IGNORE);
			case ADSPCLDENY:
				ap->csCode = dspCLDeny;
				if ((error = adspCLDeny(sp, ap))) {
				adspioc_ack(error, mp, gref);
				}
				return(STR_IGNORE);
			case ADSPSTATUS:
				ap->csCode = dspStatus;
				if ((error = adspStatus(sp, ap))) {
				adspioc_ack(error, mp, gref);
				}
				return(STR_IGNORE);
			case ADSPREAD:
				ap->csCode = dspRead;
				if ((error = adspRead(sp, ap))) {
				adspioc_ack(error, mp, gref);
				}
				return(STR_IGNORE);
			case ADSPATTENTION:
				ap->csCode = dspAttention;
				if ((error = adspReadAttention(sp, ap))) {
				adspioc_ack(error, mp, gref);
				}
				return(STR_IGNORE);
			case ADSPOPTIONS:
				ap->csCode = dspOptions;
				if ((error = adspOptions(sp, ap))) {
				adspioc_ack(error, mp, gref);
				}
				return(STR_IGNORE);
			case ADSPRESET:
				ap->csCode = dspReset;
				if ((error = adspReset(sp, ap))) {
				adspioc_ack(error, mp, gref);
				}
				return(STR_IGNORE);
			case ADSPNEWCID:
				ap->csCode = dspNewCID;
				if ((error = adspNewCID(sp, ap))) {
				adspioc_ack(error, mp, gref);
				}
				return(STR_IGNORE);
			default:
				return(STR_PUTNEXT);	/* pass it on down */
		}
		return(STR_IGNORE);
		case MSG_PROTO:
		default:
		gbuf_freem(mp);
    }
}


adspReadHandler(gref, mp)
    gref_t *gref;
    gbuf_t *mp;
{
    int error;

    switch(gbuf_type(mp)) {
    case MSG_DATA:
	if ((error = adspPacket(gref, mp))) {
	    gbuf_freem(mp);
	}
	break;
	
    case MSG_IOCTL:
    default:
	return(STR_PUTNEXT);
	break;
    }
    return(STR_IGNORE);
}

/*
 * adsp_sendddp()
 *
 * Description:
 *      This procedure a formats a DDP datagram header and calls the
 *      DDP module to queue it for routing and transmission according to
 *      the DDP parameters.  We always take control of the datagram;
 *      if there is an error we free it, otherwise we pass it to the next
 *      layer.  We don't need to set the src address fileds because the
 *      DDP layer fills these in for us.
 *
 * Calling Sequence:
 *      ret_status = adsp_sendddp(q, sp, mp, length, dstnetaddr, ddptype);
 *
 * Formal Parameters:
 *	sp		Caller stream pointer
 *      mp              gbuf_t chain containing the datagram to transmit
 *			The first mblk contains the ADSP header and space
 *			for the DDP header.
 *      length          size of data portion of datagram
 *      dstnetaddr      address of 4-byte destination internet address
 *      ddptype         DDP protocol to assign to the datagram
 *
 * Completion Status:
 *      0               Procedure successful completed.
 *      EMSGSIZE        Specified datagram length is too big.
 *
 * Side Effects:
 *      NONE
 */

adsp_sendddp(sp, mp, length, dstnetaddr, ddptype)
   CCBPtr sp;
   gbuf_t *mp;
   int length;
   AddrUnion *dstnetaddr;
   int ddptype;
{
   DDPX_FRAME   *ddp;
   gbuf_t *mlist = mp;

   if (mp == 0)
       return EINVAL;

   if (length > DDP_DATA_SIZE) {
       gbuf_freel(mlist);
       return EMSGSIZE;
   }

  while (mp) {

   if (length == 0)
       length = gbuf_msgsize(mp) - DDPL_FRAME_LEN;
   /* Set up the DDP header */

   ddp = (DDPX_FRAME *) gbuf_rptr(mp);
   UAS_ASSIGN_HTON(ddp->ddpx_length, (length + DDPL_FRAME_LEN));
   UAS_ASSIGN(ddp->ddpx_cksm, 0);
   if (sp) {
	if (sp->useCheckSum)
	   UAS_ASSIGN_HTON(ddp->ddpx_cksm, 1);
   }

   NET_ASSIGN(ddp->ddpx_dnet, dstnetaddr->a.net);
   ddp->ddpx_dnode = dstnetaddr->a.node;
   ddp->ddpx_source = sp ? sp->localSocket : ddp->ddpx_dest;
   ddp->ddpx_dest = dstnetaddr->a.socket;

   ddp->ddpx_type = ddptype;
   length = 0;
   mp = gbuf_next(mp);

  }
	   
   DDP_OUTPUT(mlist);
   return 0;
}

void NotifyUser(sp)
    register CCBPtr sp;

{
/*
    pidsig(sp->pid, SIGIO);
*/
}

void UrgentUser(sp)
    register CCBPtr sp;
{
/*
    pidsig(sp->pid, SIGURG);
*/
}
Commit	Line	Data
1c79356b	1	/*
5d5c5d0d A	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	3	*
6601e61a	4	* @APPLE_LICENSE_HEADER_START@
1c79356b	5	*
6601e61a A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
8f6c56a5	11	*
6601e61a A	12	* This Original Code and all software distributed under the License are
6601e61a A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
8f6c56a5 A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
6601e61a A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
8f6c56a5	19	*
6601e61a	20	* @APPLE_LICENSE_HEADER_END@
1c79356b A	21	*/
	22	/*
	23	* Change log:
	24	* 06/29/95 - Modified to handle flow control for writing (Tuyen Nguyen)
	25	* Modified for MP, 1996 by Tuyen Nguyen
	26	* Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
	27	*/
	28	#define RESOLVE_DBG
	29	#include <sys/errno.h>
	30	#include <sys/types.h>
	31	#include <sys/param.h>
	32	#include <machine/spl.h>
	33	#include <sys/systm.h>
	34	#include <sys/kernel.h>
	35	#include <sys/proc.h>
	36	#include <sys/filedesc.h>
	37	#include <sys/fcntl.h>
	38	#include <sys/mbuf.h>
	39	#include <sys/socket.h>
	40
	41	#include <netat/sysglue.h>
	42	#include <netat/appletalk.h>
	43	#include <netat/at_pcb.h>
	44	#include <netat/ddp.h>
	45	#include <netat/adsp.h>
	46	#include <netat/adsp_internal.h>
	47
	48	#ifdef notdefn
	49	struct adsp_debug adsp_dtable[1025];
	50	int ad_entry = 0;
	51	#endif
	52
1c79356b A	53
	54	adspAllocateCCB(gref)
	55	register gref_t gref; / READ queue */
	56	{
	57	gbuf_t *ccb_mp;
	58	register CCBPtr sp;
	59
	60	if (!(ccb_mp = gbuf_alloc(sizeof(CCB), PRI_LO))) {
	61	return (0);
	62	}
	63	bzero((caddr_t) gbuf_rptr(ccb_mp), sizeof(CCB));
	64	gbuf_wset(ccb_mp,sizeof(CCB));
	65	gref->info = (caddr_t) ccb_mp;
	66	sp = (CCBPtr)gbuf_rptr(((gbuf_t *)gref->info));
	67
	68	sp->pid = gref->pid; /* save the caller process pointer */
	69	sp->gref = gref; /* save a back pointer to the WRITE queue */
	70	sp->sp_mp = ccb_mp; /* and its message block */
1c79356b A	71	return 1;
	72	}
	73
	74	adspRelease(gref)
	75	register gref_t gref; / READ queue */
	76	{
	77	register CCBPtr sp;
1c79356b	78
1c79356b A	79	if (gref->info) {
1c79356b A	80	sp = (CCBPtr)gbuf_rptr(((gbuf_t *)gref->info));
1c79356b A	81	/* Tells completion routine of close */
	82	/* packet to remove us. */
	83
	84	if (sp->state == sPassive \|\| sp->state == sClosed \|\|
	85	sp->state == sOpening \|\| sp->state == sListening) {
1c79356b A	86	if (sp->state == sListening)
	87	CompleteQueue(&sp->opb, errAborted);
	88	sp->removing = 1; /* Prevent allowing another dspClose. */
	89	DoClose(sp, errAborted, 0); /* will remove CCB */
	90	return 0;
	91	} else { /* sClosing & sOpen */
	92	sp->state = sClosing;
	93	}
1c79356b A	94
	95	if (CheckOkToClose(sp)) { /* going to close */
	96	sp->sendCtl = B_CTL_CLOSE; /* Send close advice */
	97	} else {
	98	CheckSend(sp); /* try one more time to send out data */
	99	if (sp->state != sClosed)
	100	sp->sendCtl = B_CTL_CLOSE; /* Setup to send close advice */
	101	}
	102	CheckSend(sp); /* and force out the close */
1c79356b A	103	sp->removing = 1; /* Prevent allowing another dspClose. */
1c79356b A	104	sp->state = sClosed;
1c79356b	105	DoClose(sp, errAborted, 0); /* to closed and remove CCB */
0c530ab8	106	}
1c79356b A	107	}
	108
	109
	110
	111
	112	adspWriteHandler(gref, mp)
	113	gref_t gref; / WRITE queue */
	114	gbuf_t *mp;
	115	{
	116
	117	register ioc_t *iocbp;
	118	register struct adspcmd *ap;
	119	int error, flag;
	120	void *sp;
	121
	122	switch(gbuf_type(mp)) {
91447636 A	123	case MSG_DATA:
	124	if (gref->info == 0) {
	125	gbuf_freem(mp);
	126	return(STR_IGNORE);
	127	}
	128	/*
	129	* Fill in the global stuff
	130	*/
	131	ap = (struct adspcmd *)gbuf_rptr(mp);
	132	ap->gref = gref;
	133	ap->ioc = 0;
	134	ap->mp = mp;
	135	sp = (void )gbuf_rptr(((gbuf_t )gref->info));
1c79356b	136	switch(ap->csCode) {
91447636 A	137	case dspWrite:
	138	if ((error = adspWrite(sp, ap)))
	139	gbuf_freem(mp);
	140	return(STR_IGNORE);
	141	case dspAttention:
	142	if ((error = adspAttention(sp, ap)))
	143	gbuf_freem(mp);
	144	return(STR_IGNORE);
1c79356b	145	}
91447636 A	146	case MSG_IOCTL:
	147	if (gref->info == 0) {
	148	adspioc_ack(EPROTOTYPE, mp, gref);
	149	return(STR_IGNORE);
	150	}
	151	iocbp = (ioc_t *) gbuf_rptr(mp);
	152	if (ADSP_IOCTL(iocbp->ioc_cmd)) {
	153	iocbp->ioc_count = sizeof(*ap) - 1;
	154	if (gbuf_cont(mp) == 0) {
	155	adspioc_ack(EINVAL, mp, gref);
	156	return(STR_IGNORE);
	157	}
	158	ap = (struct adspcmd *) gbuf_rptr(gbuf_cont(mp));
	159	ap->gref = gref;
	160	ap->ioc = (caddr_t) mp;
	161	ap->mp = gbuf_cont(mp); /* request head */
	162	ap->ioResult = 0;
	163
	164	if ((gref->info == 0) && ((iocbp->ioc_cmd != ADSPOPEN) &&
	165	(iocbp->ioc_cmd != ADSPCLLISTEN))) {
	166	ap->ioResult = errState;
	167
	168	adspioc_ack(EINVAL, mp, gref);
	169	return(STR_IGNORE);
	170	}
	171	} else
	172	return(STR_PUTNEXT); /* pass it on down */
	173	sp = (void )gbuf_rptr(((gbuf_t )gref->info));
	174	switch(iocbp->ioc_cmd) {
	175	case ADSPOPEN:
	176	case ADSPCLLISTEN:
	177	ap->socket = ((CCBPtr)sp)->localSocket;
	178	flag = (adspMode(ap) == ocAccept) ? 1 : 0;
	179	if (flag && ap->socket) {
	180	if (adspDeassignSocket((CCBPtr)sp) >= 0)
	181	ap->socket = 0;
	182	}
	183	if ((ap->socket == 0) &&
	184	((ap->socket =
	185	(at_socket)adspAssignSocket(gref, flag)) == 0)) {
	186	adspioc_ack(EADDRNOTAVAIL, mp, gref);
	187	return(STR_IGNORE);
	188	}
	189	ap->csCode = iocbp->ioc_cmd == ADSPOPEN ? dspInit : dspCLInit;
	190	if ((error = adspInit(sp, ap)) == 0) {
	191	switch(ap->csCode) {
	192	case dspInit:
	193	/* and open the connection */
	194	ap->csCode = dspOpen;
	195	error = adspOpen(sp, ap);
	196	break;
	197	case dspCLInit:
	198	/* ADSPCLLISTEN */
	199	ap->csCode = dspCLListen;
	200	error = adspCLListen(sp, ap);
	201	break;
	202	}
	203	}
	204	if (error)
	205	adspioc_ack(error, mp, gref); /* if this failed req complete */
	206	return(STR_IGNORE);
	207	case ADSPCLOSE:
	208	ap->csCode = dspClose;
	209	if ((error = adspClose(sp, ap))) {
210	adspioc_ack(error, mp, gref);
211	break;
212	}
213	break;
214	case ADSPCLREMOVE:
215	ap->csCode = dspCLRemove;
216	error = adspClose(sp, ap);
217	adspioc_ack(error, mp, gref);
218	return(STR_IGNORE);
219	case ADSPCLDENY:
220	ap->csCode = dspCLDeny;
221	if ((error = adspCLDeny(sp, ap))) {
222	adspioc_ack(error, mp, gref);
223	}
224	return(STR_IGNORE);
225	case ADSPSTATUS:
226	ap->csCode = dspStatus;
227	if ((error = adspStatus(sp, ap))) {
228	adspioc_ack(error, mp, gref);
229	}
230	return(STR_IGNORE);
231	case ADSPREAD:
232	ap->csCode = dspRead;
233	if ((error = adspRead(sp, ap))) {
234	adspioc_ack(error, mp, gref);
235	}
236	return(STR_IGNORE);
237	case ADSPATTENTION:
238	ap->csCode = dspAttention;
239	if ((error = adspReadAttention(sp, ap))) {
240	adspioc_ack(error, mp, gref);
241	}
242	return(STR_IGNORE);
243	case ADSPOPTIONS:
244	ap->csCode = dspOptions;
245	if ((error = adspOptions(sp, ap))) {
246	adspioc_ack(error, mp, gref);
247	}
248	return(STR_IGNORE);
249	case ADSPRESET:
250	ap->csCode = dspReset;
251	if ((error = adspReset(sp, ap))) {
252	adspioc_ack(error, mp, gref);
253	}
254	return(STR_IGNORE);
255	case ADSPNEWCID:
256	ap->csCode = dspNewCID;
257	if ((error = adspNewCID(sp, ap))) {
258	adspioc_ack(error, mp, gref);
259	}
260	return(STR_IGNORE);
261	default:
262	return(STR_PUTNEXT); /* pass it on down */
263	}
264	return(STR_IGNORE);
265	case MSG_PROTO:
266	default:
267	gbuf_freem(mp);
1c79356b A	268	}
	269	}
	270
	271
	272	adspReadHandler(gref, mp)
	273	gref_t *gref;
	274	gbuf_t *mp;
	275	{
	276	int error;
	277
	278	switch(gbuf_type(mp)) {
	279	case MSG_DATA:
	280	if ((error = adspPacket(gref, mp))) {
	281	gbuf_freem(mp);
	282	}
	283	break;
	284
	285	case MSG_IOCTL:
	286	default:
	287	return(STR_PUTNEXT);
	288	break;
	289	}
	290	return(STR_IGNORE);
	291	}
	292
	293	/*
	294	* adsp_sendddp()
	295	*
	296	* Description:
	297	* This procedure a formats a DDP datagram header and calls the
	298	* DDP module to queue it for routing and transmission according to
	299	* the DDP parameters. We always take control of the datagram;
	300	* if there is an error we free it, otherwise we pass it to the next
	301	* layer. We don't need to set the src address fileds because the
	302	* DDP layer fills these in for us.
	303	*
	304	* Calling Sequence:
	305	* ret_status = adsp_sendddp(q, sp, mp, length, dstnetaddr, ddptype);
	306	*
	307	* Formal Parameters:
	308	* sp Caller stream pointer
	309	* mp gbuf_t chain containing the datagram to transmit
	310	* The first mblk contains the ADSP header and space
	311	* for the DDP header.
	312	* length size of data portion of datagram
	313	* dstnetaddr address of 4-byte destination internet address
	314	* ddptype DDP protocol to assign to the datagram
	315	*
	316	* Completion Status:
	317	* 0 Procedure successful completed.
	318	* EMSGSIZE Specified datagram length is too big.
	319	*
	320	* Side Effects:
	321	* NONE
	322	*/
	323
	324	adsp_sendddp(sp, mp, length, dstnetaddr, ddptype)
	325	CCBPtr sp;
	326	gbuf_t *mp;
	327	int length;
	328	AddrUnion *dstnetaddr;
	329	int ddptype;
	330	{
	331	DDPX_FRAME *ddp;
332	gbuf_t *mlist = mp;
333
334	if (mp == 0)
335	return EINVAL;
336
337	if (length > DDP_DATA_SIZE) {
338	gbuf_freel(mlist);
339	return EMSGSIZE;
340	}
341
342	while (mp) {
343
344	if (length == 0)
345	length = gbuf_msgsize(mp) - DDPL_FRAME_LEN;
346	/* Set up the DDP header */
347
348	ddp = (DDPX_FRAME *) gbuf_rptr(mp);
0c530ab8	349	UAS_ASSIGN_HTON(ddp->ddpx_length, (length + DDPL_FRAME_LEN));
1c79356b A	350	UAS_ASSIGN(ddp->ddpx_cksm, 0);
	351	if (sp) {
	352	if (sp->useCheckSum)
0c530ab8	353	UAS_ASSIGN_HTON(ddp->ddpx_cksm, 1);
1c79356b A	354	}
	355
	356	NET_ASSIGN(ddp->ddpx_dnet, dstnetaddr->a.net);
	357	ddp->ddpx_dnode = dstnetaddr->a.node;
	358	ddp->ddpx_source = sp ? sp->localSocket : ddp->ddpx_dest;
	359	ddp->ddpx_dest = dstnetaddr->a.socket;
	360
	361	ddp->ddpx_type = ddptype;
	362	length = 0;
	363	mp = gbuf_next(mp);
	364
	365	}
	366
	367	DDP_OUTPUT(mlist);
	368	return 0;
	369	}
	370
	371	void NotifyUser(sp)
	372	register CCBPtr sp;
	373
	374	{
	375	/*
	376	pidsig(sp->pid, SIGIO);
	377	*/
	378	}
	379
	380	void UrgentUser(sp)
	381	register CCBPtr sp;
	382	{
	383	/*
	384	pidsig(sp->pid, SIGURG);
	385	*/
	386	}