bsd/netat/adsp_attention.c

   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  */
  79 int 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;
  92 l_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 }