bsd/netat/adsp_Status.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * dspStatus.c
  24  *
  25  * From Mike Shoemaker v01.04 06/15/90 mbs
  26  *    Modified for MP, 1996 by Tuyen Nguyen
  27  *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
  28  */
  29
  30 #include <sys/errno.h>
  31 #include <sys/types.h>
  32 #include <sys/param.h>
  33 #include <machine/spl.h>
  34 #include <sys/systm.h>
  35 #include <sys/kernel.h>
  36 #include <sys/proc.h>
  37 #include <sys/filedesc.h>
  38 #include <sys/fcntl.h>
  39 #include <sys/mbuf.h>
  40 #include <sys/socket.h>
  41
  42 #include <netat/sysglue.h>
  43 #include <netat/appletalk.h>
  44 #include <netat/at_pcb.h>
  45 #include <netat/adsp.h>
  46 #include <netat/adsp_internal.h>
  47
  48 /*
  49  * calcSendFree
  50  *
  51  * INPUTS:
  52  *              sp              ADSP Stream
  53  * OUTPUTS:
  54  *              # of bytes avail in local send queue
  55  */
  56 int CalcSendQFree(sp)           /* (CCBPtr sp) */
  57     CCBPtr sp;
  58 {
  59     int bytes;
  60
  61     bytes = calcSendQ(sp);
  62     bytes = sp->sbuflen - bytes;
  63
  64     if (bytes < 0)
  65         return 0;
  66     return bytes;
  67 }
  68
  69 calcSendQ(sp)
  70     CCBPtr sp;
  71 {
  72     register gbuf_t *mp;
  73     int bytes = 0;
  74
  75     if (sp->sData) {            /* There is data in buffer */
  76         if (mp = sp->sbuf_mb) {
  77             do {
  78                 bytes += gbuf_msgsize(mp);
  79                 mp = gbuf_next(mp);
  80             } while (mp);
  81         }
  82         if (mp = sp->csbuf_mb)
  83             bytes += gbuf_msgsize(mp);
  84     }
  85     return bytes;
  86 }
  87
  88 /*
  89  * dspStatus
  90  *
  91  * INPUTS:
  92  *      --> ccbRefNum           refnum of connection end
  93  *
  94  * OUTPUTS:
  95  *      <-- statusCCB           Pointer to the connection control block
  96  *      <-- sendQPending        bytes waiting to be sent or acknowledged
  97  *      <-- sendQFree           available buffer in bytes of send queue
  98  *      <-- recvQPending        bytes waiting to be read from queue
  99  *      <-- recvQFree           available buffer in bytes of receive queue
 100  *
 101  * ERRORS:
 102  *      errRefNum               bad connection refnum
 103  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 104 */
 105 int adspStatus(sp, pb)  /* (DSPPBPtr pb) */
 106     CCBPtr sp;
 107     register struct adspcmd *pb;
 108 {
 109     short err;
 110     short bytes;
 111     int s;
 112
 113     if (sp == 0) {
 114         pb->ioResult = errRefNum;
 115         return EINVAL;
 116     }
 117
 118     pb->u.statusParams.ccbPtr   = (TPCCB)sp;
 119     ATDISABLE(s, sp->lock);
 120
 121     /*
 122      * pending bytes in send queue
 123      */
 124     if (sp->sData)
 125         bytes = calcSendQ(sp);
 126     else
 127         bytes = 0;
 128     pb->u.statusParams.sendQPending = bytes;
 129
 130                                 /* available buffer space in send queue */
 131     pb->u.statusParams.sendQFree = CalcSendQFree(sp);
 132
 133     /*
 134      * pending bytes in recv queue
 135      */
 136     if (sp->rData)
 137         bytes = calcRecvQ(sp);
 138     else
 139         bytes = 0;
 140     pb->u.statusParams.recvQPending = bytes;
 141
 142                                 /* available buffer space in receive queue */
 143     pb->u.statusParams.recvQFree = CalcRecvWdw(sp);
 144
 145     ATENABLE(s, sp->lock);
 146     pb->ioResult = 0;
 147     adspioc_ack(0, pb->ioc, pb->gref);
 148     return 0;
 149
 150 }