bsd/netat/adsp_Status.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  * dspStatus.c
  30  *
  31  * From Mike Shoemaker v01.04 06/15/90 mbs
  32  *    Modified for MP, 1996 by Tuyen Nguyen
  33  *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
  34  */
  35
  36 #include <sys/errno.h>
  37 #include <sys/types.h>
  38 #include <sys/param.h>
  39 #include <machine/spl.h>
  40 #include <sys/systm.h>
  41 #include <sys/kernel.h>
  42 #include <sys/proc.h>
  43 #include <sys/filedesc.h>
  44 #include <sys/fcntl.h>
  45 #include <sys/mbuf.h>
  46 #include <sys/socket.h>
  47
  48 #include <netat/sysglue.h>
  49 #include <netat/appletalk.h>
  50 #include <netat/at_pcb.h>
  51 #include <netat/adsp.h>
  52 #include <netat/adsp_internal.h>
  53
  54 int calcSendQ(CCBPtr);
  55
  56 /*
  57  * calcSendFree
  58  *
  59  * INPUTS:
  60  *              sp              ADSP Stream
  61  * OUTPUTS:
  62  *              # of bytes avail in local send queue
  63  */
  64 int CalcSendQFree(sp)           /* (CCBPtr sp) */
  65     CCBPtr sp;
  66 {
  67     int bytes;
  68
  69     bytes = calcSendQ(sp);
  70     bytes = sp->sbuflen - bytes;
  71
  72     if (bytes < 0)
  73         return 0;
  74     return bytes;
  75 }
  76
  77 int
  78 calcSendQ(sp)
  79     CCBPtr sp;
  80 {
  81     register gbuf_t *mp;
  82     int bytes = 0;
  83
  84     if (sp->sData) {            /* There is data in buffer */
  85         if ((mp = sp->sbuf_mb)) {
  86             do {
  87                 bytes += gbuf_msgsize(mp);
  88                 mp = gbuf_next(mp);
  89             } while (mp);
  90         }
  91         if ((mp = sp->csbuf_mb))
  92             bytes += gbuf_msgsize(mp);
  93     }
  94     return bytes;
  95 }
  96
  97 /*
  98  * dspStatus
  99  *
 100  * INPUTS:
 101  *      --> ccbRefNum           refnum of connection end
 102  *
 103  * OUTPUTS:
 104  *      <-- statusCCB           Pointer to the connection control block
 105  *      <-- sendQPending        bytes waiting to be sent or acknowledged
 106  *      <-- sendQFree           available buffer in bytes of send queue
 107  *      <-- recvQPending        bytes waiting to be read from queue
 108  *      <-- recvQFree           available buffer in bytes of receive queue
 109  *
 110  * ERRORS:
 111  *      errRefNum               bad connection refnum
 112  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 113 */
 114 int adspStatus(sp, pb)  /* (DSPPBPtr pb) */
 115     CCBPtr sp;
 116     register struct adspcmd *pb;
 117 {
 118     short bytes;
 119
 120     if (sp == 0) {
 121         pb->ioResult = errRefNum;
 122         return EINVAL;
 123     }
 124
 125     pb->u.statusParams.ccbPtr   = (TPCCB)sp;
 126
 127     /*
 128      * pending bytes in send queue
 129      */
 130     if (sp->sData)
 131         bytes = calcSendQ(sp);
 132     else
 133         bytes = 0;
 134     pb->u.statusParams.sendQPending = bytes;
 135
 136                                 /* available buffer space in send queue */
 137     pb->u.statusParams.sendQFree = CalcSendQFree(sp);
 138
 139     /*
 140      * pending bytes in recv queue
 141      */
 142     if (sp->rData)
 143         bytes = calcRecvQ(sp);
 144     else
 145         bytes = 0;
 146     pb->u.statusParams.recvQPending = bytes;
 147
 148                                 /* available buffer space in receive queue */
 149     pb->u.statusParams.recvQFree = CalcRecvWdw(sp);
 150
 151     pb->ioResult = 0;
 152     adspioc_ack(0, (gbuf_t *)pb->ioc, pb->gref);
 153     return 0;
 154
 155 }