bsd/netat/adsp_attention.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * dspAttention.c
  32  *
  33  * From Mike Shoemaker v01.05  03/16/90 mbs
  34  */
  35 /*
  36  * Change log:
  37  *   06/29/95 - Modified to handle flow control for writing (Tuyen Nguyen)
  38  *    Modified for MP, 1996 by Tuyen Nguyen
  39  *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
  40  */
  41
  42 #include <sys/errno.h>
  43 #include <sys/types.h>
  44 #include <sys/param.h>
  45 #include <machine/spl.h>
  46 #include <sys/systm.h>
  47 #include <sys/kernel.h>
  48 #include <sys/proc.h>
  49 #include <sys/filedesc.h>
  50 #include <sys/fcntl.h>
  51 #include <sys/mbuf.h>
  52 #include <sys/socket.h>
  53
  54 #include <netat/sysglue.h>
  55 #include <netat/appletalk.h>
  56 #include <netat/at_pcb.h>
  57 #include <netat/debug.h>
  58 #include <netat/adsp.h>
  59 #include <netat/adsp_internal.h>
  60
  61 /*
  62  * dspAttention
  63  *
  64  * INPUTS:
  65  *      --> ccbRefNum           refnum of connection end
  66  *      --> attnCode            client attention code
  67  *      --> attnSize            size in bytes of attention data
  68  *      --> attnData            pointer to attention data
  69  *      --> attnInterval        attention retransmit interval
  70  *                              (ignored by ADSP 1.5 & up)
  71  *
  72  * OUTPUTS:
  73  *      none
  74  *
  75  * ERRORS:
  76  *      errRefNum               bad connection refnum
  77  *      errState                connection is not open
  78  *      errAttention            attention message too long
  79  *      errAborted              request aborted by Remove or Close call
  80  */
  81 int adspAttention(register struct adspcmd *pb, register CCBPtr sp)
  82 {
  83     register gbuf_t *mp, *nmp;
  84     unsigned char uerr;
  85
  86     if (sp == 0) {
  87         pb->ioResult = errRefNum;
  88         return EINVAL;
  89     }
  90
  91     if (sp->state != sOpen) {   /* If we're not open, tell user to go away */
  92         pb->ioResult = errState;
  93         uerr = ENOTCONN;
  94 l_err:
  95         atalk_notify(sp->gref, uerr);
  96         gbuf_freem(pb->mp);
  97         return 0;
  98     }
  99
 100     if (pb->u.attnParams.attnSize > attnBufSize) /* If data too big, bye-bye */
 101     {
 102         pb->ioResult = errAttention;
 103         uerr = ERANGE;
 104         goto l_err;
 105     }
 106
 107     /* The 1st mbuf in the pb->mp chain (mp) is the adspcmd structure.
 108        The 2nd mbuf (nmp) will be the beginning of the data. */
 109     mp = pb->mp;
 110     if (pb->u.attnParams.attnSize) {
 111         nmp = gbuf_cont(mp);
 112         if (gbuf_len(mp) > sizeof(struct adspcmd)) {
 113             if ((nmp = gbuf_dupb(mp)) == 0) {
 114                 gbuf_wset(mp, sizeof(struct adspcmd));
 115                 uerr = ENOBUFS;
 116                 goto l_err;
 117             }
 118             gbuf_wset(mp, sizeof(struct adspcmd));
 119             gbuf_rinc(nmp, sizeof(struct adspcmd));
 120             gbuf_cont(nmp) = gbuf_cont(mp);
 121             gbuf_cont(mp) = nmp;
 122         }
 123     }
 124     pb->ioDirection = 1;        /* outgoing attention data */
 125     if (sp->sapb) {             /* Pending attentions already? */
 126                 qAddToEnd(&sp->sapb, pb); /* Just add to end of queue */
 127     } else {
 128                 sp->sendAttnData = 1;   /* Start off this attention */
 129                 pb->qLink = 0;
 130                 sp->sapb = pb;
 131                 CheckSend(sp);
 132     }
 133     pb->ioResult = 1;   /* indicate that the IO is not complete */
 134     return 0;
 135 }