bsd/netat/adsp_Status.c

   1 /*
   2  * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * dspStatus.c
  32  *
  33  * From Mike Shoemaker v01.04 06/15/90 mbs
  34  *    Modified for MP, 1996 by Tuyen Nguyen
  35  *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
  36  */
  37
  38 #include <sys/errno.h>
  39 #include <sys/types.h>
  40 #include <sys/param.h>
  41 #include <machine/spl.h>
  42 #include <sys/systm.h>
  43 #include <sys/kernel.h>
  44 #include <sys/proc.h>
  45 #include <sys/filedesc.h>
  46 #include <sys/fcntl.h>
  47 #include <sys/mbuf.h>
  48 #include <sys/socket.h>
  49
  50 #include <netat/sysglue.h>
  51 #include <netat/appletalk.h>
  52 #include <netat/at_pcb.h>
  53 #include <netat/adsp.h>
  54 #include <netat/adsp_internal.h>
  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 calcSendQ(sp)
  78     CCBPtr sp;
  79 {
  80     register gbuf_t *mp;
  81     int bytes = 0;
  82
  83     if (sp->sData) {            /* There is data in buffer */
  84         if (mp = sp->sbuf_mb) {
  85             do {
  86                 bytes += gbuf_msgsize(mp);
  87                 mp = gbuf_next(mp);
  88             } while (mp);
  89         }
  90         if (mp = sp->csbuf_mb)
  91             bytes += gbuf_msgsize(mp);
  92     }
  93     return bytes;
  94 }
  95
  96 /*
  97  * dspStatus
  98  *
  99  * INPUTS:
 100  *      --> ccbRefNum           refnum of connection end
 101  *
 102  * OUTPUTS:
 103  *      <-- statusCCB           Pointer to the connection control block
 104  *      <-- sendQPending        bytes waiting to be sent or acknowledged
 105  *      <-- sendQFree           available buffer in bytes of send queue
 106  *      <-- recvQPending        bytes waiting to be read from queue
 107  *      <-- recvQFree           available buffer in bytes of receive queue
 108  *
 109  * ERRORS:
 110  *      errRefNum               bad connection refnum
 111  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 112 */
 113 int adspStatus(sp, pb)  /* (DSPPBPtr pb) */
 114     CCBPtr sp;
 115     register struct adspcmd *pb;
 116 {
 117     short err;
 118     short bytes;
 119     int s;
 120
 121     if (sp == 0) {
 122         pb->ioResult = errRefNum;
 123         return EINVAL;
 124     }
 125
 126     pb->u.statusParams.ccbPtr   = (TPCCB)sp;
 127     ATDISABLE(s, sp->lock);
 128
 129     /*
 130      * pending bytes in send queue
 131      */
 132     if (sp->sData)
 133         bytes = calcSendQ(sp);
 134     else
 135         bytes = 0;
 136     pb->u.statusParams.sendQPending = bytes;
 137
 138                                 /* available buffer space in send queue */
 139     pb->u.statusParams.sendQFree = CalcSendQFree(sp);
 140
 141     /*
 142      * pending bytes in recv queue
 143      */
 144     if (sp->rData)
 145         bytes = calcRecvQ(sp);
 146     else
 147         bytes = 0;
 148     pb->u.statusParams.recvQPending = bytes;
 149
 150                                 /* available buffer space in receive queue */
 151     pb->u.statusParams.recvQFree = CalcRecvWdw(sp);
 152
 153     ATENABLE(s, sp->lock);
 154     pb->ioResult = 0;
 155     adspioc_ack(0, pb->ioc, pb->gref);
 156     return 0;
 157
 158 }