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 /*
  55  * calcSendFree
  56  *
  57  * INPUTS:
  58  *              sp              ADSP Stream
  59  * OUTPUTS:
  60  *              # of bytes avail in local send queue
  61  */
  62 int CalcSendQFree(sp)           /* (CCBPtr sp) */
  63     CCBPtr sp;
  64 {
  65     int bytes;
  66
  67     bytes = calcSendQ(sp);
  68     bytes = sp->sbuflen - bytes;
  69
  70     if (bytes < 0)
  71         return 0;
  72     return bytes;
  73 }
  74
  75 calcSendQ(sp)
  76     CCBPtr sp;
  77 {
  78     register gbuf_t *mp;
  79     int bytes = 0;
  80
  81     if (sp->sData) {            /* There is data in buffer */
  82         if (mp = sp->sbuf_mb) {
  83             do {
  84                 bytes += gbuf_msgsize(mp);
  85                 mp = gbuf_next(mp);
  86             } while (mp);
  87         }
  88         if (mp = sp->csbuf_mb)
  89             bytes += gbuf_msgsize(mp);
  90     }
  91     return bytes;
  92 }
  93
  94 /*
  95  * dspStatus
  96  *
  97  * INPUTS:
  98  *      --> ccbRefNum           refnum of connection end
  99  *
 100  * OUTPUTS:
 101  *      <-- statusCCB           Pointer to the connection control block
 102  *      <-- sendQPending        bytes waiting to be sent or acknowledged
 103  *      <-- sendQFree           available buffer in bytes of send queue
 104  *      <-- recvQPending        bytes waiting to be read from queue
 105  *      <-- recvQFree           available buffer in bytes of receive queue
 106  *
 107  * ERRORS:
 108  *      errRefNum               bad connection refnum
 109  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 110 */
 111 int adspStatus(sp, pb)  /* (DSPPBPtr pb) */
 112     CCBPtr sp;
 113     register struct adspcmd *pb;
 114 {
 115     short err;
 116     short bytes;
 117
 118     if (sp == 0) {
 119         pb->ioResult = errRefNum;
 120         return EINVAL;
 121     }
 122
 123     pb->u.statusParams.ccbPtr   = (TPCCB)sp;
 124
 125     /*
 126      * pending bytes in send queue
 127      */
 128     if (sp->sData)
 129         bytes = calcSendQ(sp);
 130     else
 131         bytes = 0;
 132     pb->u.statusParams.sendQPending = bytes;
 133
 134                                 /* available buffer space in send queue */
 135     pb->u.statusParams.sendQFree = CalcSendQFree(sp);
 136
 137     /*
 138      * pending bytes in recv queue
 139      */
 140     if (sp->rData)
 141         bytes = calcRecvQ(sp);
 142     else
 143         bytes = 0;
 144     pb->u.statusParams.recvQPending = bytes;
 145
 146                                 /* available buffer space in receive queue */
 147     pb->u.statusParams.recvQFree = CalcRecvWdw(sp);
 148
 149     pb->ioResult = 0;
 150     adspioc_ack(0, pb->ioc, pb->gref);
 151     return 0;
 152
 153 }