bsd/netat/adsp_Status.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * dspStatus.c
  25  *
  26  * From Mike Shoemaker v01.04 06/15/90 mbs
  27  *    Modified for MP, 1996 by Tuyen Nguyen
  28  *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
  29  */
  30
  31 #include <sys/errno.h>
  32 #include <sys/types.h>
  33 #include <sys/param.h>
  34 #include <machine/spl.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/proc.h>
  38 #include <sys/filedesc.h>
  39 #include <sys/fcntl.h>
  40 #include <sys/mbuf.h>
  41 #include <sys/socket.h>
  42
  43 #include <netat/sysglue.h>
  44 #include <netat/appletalk.h>
  45 #include <netat/at_pcb.h>
  46 #include <netat/adsp.h>
  47 #include <netat/adsp_internal.h>
  48
  49 /*
  50  * calcSendFree
  51  *
  52  * INPUTS:
  53  *              sp              ADSP Stream
  54  * OUTPUTS:
  55  *              # of bytes avail in local send queue
  56  */
  57 int CalcSendQFree(sp)           /* (CCBPtr sp) */
  58     CCBPtr sp;
  59 {
  60     int bytes;
  61
  62     bytes = calcSendQ(sp);
  63     bytes = sp->sbuflen - bytes;
  64
  65     if (bytes < 0)
  66         return 0;
  67     return bytes;
  68 }
  69
  70 calcSendQ(sp)
  71     CCBPtr sp;
  72 {
  73     register gbuf_t *mp;
  74     int bytes = 0;
  75
  76     if (sp->sData) {            /* There is data in buffer */
  77         if (mp = sp->sbuf_mb) {
  78             do {
  79                 bytes += gbuf_msgsize(mp);
  80                 mp = gbuf_next(mp);
  81             } while (mp);
  82         }
  83         if (mp = sp->csbuf_mb)
  84             bytes += gbuf_msgsize(mp);
  85     }
  86     return bytes;
  87 }
  88
  89 /*
  90  * dspStatus
  91  *
  92  * INPUTS:
  93  *      --> ccbRefNum           refnum of connection end
  94  *
  95  * OUTPUTS:
  96  *      <-- statusCCB           Pointer to the connection control block
  97  *      <-- sendQPending        bytes waiting to be sent or acknowledged
  98  *      <-- sendQFree           available buffer in bytes of send queue
  99  *      <-- recvQPending        bytes waiting to be read from queue
 100  *      <-- recvQFree           available buffer in bytes of receive queue
 101  *
 102  * ERRORS:
 103  *      errRefNum               bad connection refnum
 104  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 105 */
 106 int adspStatus(sp, pb)  /* (DSPPBPtr pb) */
 107     CCBPtr sp;
 108     register struct adspcmd *pb;
 109 {
 110     short err;
 111     short bytes;
 112     int s;
 113
 114     if (sp == 0) {
 115         pb->ioResult = errRefNum;
 116         return EINVAL;
 117     }
 118
 119     pb->u.statusParams.ccbPtr   = (TPCCB)sp;
 120     ATDISABLE(s, sp->lock);
 121
 122     /*
 123      * pending bytes in send queue
 124      */
 125     if (sp->sData)
 126         bytes = calcSendQ(sp);
 127     else
 128         bytes = 0;
 129     pb->u.statusParams.sendQPending = bytes;
 130
 131                                 /* available buffer space in send queue */
 132     pb->u.statusParams.sendQFree = CalcSendQFree(sp);
 133
 134     /*
 135      * pending bytes in recv queue
 136      */
 137     if (sp->rData)
 138         bytes = calcRecvQ(sp);
 139     else
 140         bytes = 0;
 141     pb->u.statusParams.recvQPending = bytes;
 142
 143                                 /* available buffer space in receive queue */
 144     pb->u.statusParams.recvQFree = CalcRecvWdw(sp);
 145
 146     ATENABLE(s, sp->lock);
 147     pb->ioResult = 0;
 148     adspioc_ack(0, pb->ioc, pb->gref);
 149     return 0;
 150
 151 }