bsd/netat/adsp_Status.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * dspStatus.c
  27  *
  28  * From Mike Shoemaker v01.04 06/15/90 mbs
  29  *    Modified for MP, 1996 by Tuyen Nguyen
  30  *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
  31  */
  32
  33 #include <sys/errno.h>
  34 #include <sys/types.h>
  35 #include <sys/param.h>
  36 #include <machine/spl.h>
  37 #include <sys/systm.h>
  38 #include <sys/kernel.h>
  39 #include <sys/proc.h>
  40 #include <sys/filedesc.h>
  41 #include <sys/fcntl.h>
  42 #include <sys/mbuf.h>
  43 #include <sys/socket.h>
  44
  45 #include <netat/sysglue.h>
  46 #include <netat/appletalk.h>
  47 #include <netat/at_pcb.h>
  48 #include <netat/adsp.h>
  49 #include <netat/adsp_internal.h>
  50
  51 /*
  52  * calcSendFree
  53  *
  54  * INPUTS:
  55  *              sp              ADSP Stream
  56  * OUTPUTS:
  57  *              # of bytes avail in local send queue
  58  */
  59 int CalcSendQFree(sp)           /* (CCBPtr sp) */
  60     CCBPtr sp;
  61 {
  62     int bytes;
  63
  64     bytes = calcSendQ(sp);
  65     bytes = sp->sbuflen - bytes;
  66
  67     if (bytes < 0)
  68         return 0;
  69     return bytes;
  70 }
  71
  72 calcSendQ(sp)
  73     CCBPtr sp;
  74 {
  75     register gbuf_t *mp;
  76     int bytes = 0;
  77
  78     if (sp->sData) {            /* There is data in buffer */
  79         if (mp = sp->sbuf_mb) {
  80             do {
  81                 bytes += gbuf_msgsize(mp);
  82                 mp = gbuf_next(mp);
  83             } while (mp);
  84         }
  85         if (mp = sp->csbuf_mb)
  86             bytes += gbuf_msgsize(mp);
  87     }
  88     return bytes;
  89 }
  90
  91 /*
  92  * dspStatus
  93  *
  94  * INPUTS:
  95  *      --> ccbRefNum           refnum of connection end
  96  *
  97  * OUTPUTS:
  98  *      <-- statusCCB           Pointer to the connection control block
  99  *      <-- sendQPending        bytes waiting to be sent or acknowledged
 100  *      <-- sendQFree           available buffer in bytes of send queue
 101  *      <-- recvQPending        bytes waiting to be read from queue
 102  *      <-- recvQFree           available buffer in bytes of receive queue
 103  *
 104  * ERRORS:
 105  *      errRefNum               bad connection refnum
 106  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 107 */
 108 int adspStatus(sp, pb)  /* (DSPPBPtr pb) */
 109     CCBPtr sp;
 110     register struct adspcmd *pb;
 111 {
 112     short err;
 113     short bytes;
 114     int s;
 115
 116     if (sp == 0) {
 117         pb->ioResult = errRefNum;
 118         return EINVAL;
 119     }
 120
 121     pb->u.statusParams.ccbPtr   = (TPCCB)sp;
 122     ATDISABLE(s, sp->lock);
 123
 124     /*
 125      * pending bytes in send queue
 126      */
 127     if (sp->sData)
 128         bytes = calcSendQ(sp);
 129     else
 130         bytes = 0;
 131     pb->u.statusParams.sendQPending = bytes;
 132
 133                                 /* available buffer space in send queue */
 134     pb->u.statusParams.sendQFree = CalcSendQFree(sp);
 135
 136     /*
 137      * pending bytes in recv queue
 138      */
 139     if (sp->rData)
 140         bytes = calcRecvQ(sp);
 141     else
 142         bytes = 0;
 143     pb->u.statusParams.recvQPending = bytes;
 144
 145                                 /* available buffer space in receive queue */
 146     pb->u.statusParams.recvQFree = CalcRecvWdw(sp);
 147
 148     ATENABLE(s, sp->lock);
 149     pb->ioResult = 0;
 150     adspioc_ack(0, pb->ioc, pb->gref);
 151     return 0;
 152
 153 }