1/*
2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/*
29 * dspAttention.c
30 *
31 * From Mike Shoemaker v01.05  03/16/90 mbs
32 */
33/*
34 * Change log:
35 *   06/29/95 - Modified to handle flow control for writing (Tuyen Nguyen)
36 *    Modified for MP, 1996 by Tuyen Nguyen
37 *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
38 */
39
40#include <sys/errno.h>
41#include <sys/types.h>
42#include <sys/param.h>
43#include <machine/spl.h>
44#include <sys/systm.h>
45#include <sys/kernel.h>
46#include <sys/proc.h>
47#include <sys/filedesc.h>
48#include <sys/fcntl.h>
49#include <sys/mbuf.h>
50#include <sys/socket.h>
51
52#include <netat/sysglue.h>
53#include <netat/appletalk.h>
54#include <netat/at_pcb.h>
55#include <netat/debug.h>
56#include <netat/adsp.h>
57#include <netat/adsp_internal.h>
58
59/*
60 * dspAttention
61 *
62 * INPUTS:
63 * 	--> ccbRefNum		refnum of connection end
64 *	--> attnCode		client attention code
65 *	--> attnSize		size in bytes of attention data
66 *	--> attnData		pointer to attention data
67 *	--> attnInterval	attention retransmit interval
68 *				(ignored by ADSP 1.5 & up)
69 *
70 * OUTPUTS:
71 *	none
72 *
73 * ERRORS:
74 *	errRefNum		bad connection refnum
75 *	errState		connection is not open
76 *	errAttention		attention message too long
77 *	errAborted		request aborted by Remove or Close call
78 */
79int adspAttention(register struct adspcmd *pb, register CCBPtr sp)
80{
81    register gbuf_t *mp, *nmp;
82    unsigned char uerr;
83
84    if (sp == 0) {
85	pb->ioResult = errRefNum;
86	return EINVAL;
87    }
88
89    if (sp->state != sOpen) {	/* If we're not open, tell user to go away */
90	pb->ioResult = errState;
91	uerr = ENOTCONN;
92l_err:
93	atalk_notify(sp->gref, uerr);
94	gbuf_freem(pb->mp);
95	return 0;
96    }
97
98    if (pb->u.attnParams.attnSize > attnBufSize) /* If data too big, bye-bye */
99    {
100	pb->ioResult = errAttention;
101	uerr = ERANGE;
102	goto l_err;
103    }
104
105    /* The 1st mbuf in the pb->mp chain (mp) is the adspcmd structure.
106       The 2nd mbuf (nmp) will be the beginning of the data. */
107    mp = pb->mp;
108    if (pb->u.attnParams.attnSize) {
109        nmp = gbuf_cont(mp);
110	if (gbuf_len(mp) > sizeof(struct adspcmd)) {
111	    if ((nmp = gbuf_dupb(mp)) == 0) {
112		gbuf_wset(mp, sizeof(struct adspcmd));
113		uerr = ENOBUFS;
114		goto l_err;
115	    }
116	    gbuf_wset(mp, sizeof(struct adspcmd));
117	    gbuf_rinc(nmp, sizeof(struct adspcmd));
118	    gbuf_cont(nmp) = gbuf_cont(mp);
119	    gbuf_cont(mp) = nmp;
120	}
121    }
122    pb->ioDirection = 1;	/* outgoing attention data */
123    if (sp->sapb) {		/* Pending attentions already? */
124		qAddToEnd((struct qlink **)&sp->sapb, (struct qlink *)pb); /* Just add to end of queue */
125    } else {
126		sp->sendAttnData = 1;	/* Start off this attention */
127		pb->qLink = 0;
128		sp->sapb = pb;
129		CheckSend(sp);
130    }
131    pb->ioResult = 1;	/* indicate that the IO is not complete */
132    return 0;
133}
134