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Annotation of kernel/bsd/netat/adsp_Status.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
                      7:  * Reserved.  This file contains Original Code and/or Modifications of
                      8:  * Original Code as defined in and that are subject to the Apple Public
                      9:  * Source License Version 1.1 (the "License").  You may not use this file
                     10:  * except in compliance with the License.  Please obtain a copy of the
                     11:  * License at http://www.apple.com/publicsource and read it before using
                     12:  * this file.
                     13:  * 
                     14:  * The Original Code and all software distributed under the License are
                     15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     19:  * License for the specific language governing rights and limitations
                     20:  * under the License.
                     21:  * 
                     22:  * @APPLE_LICENSE_HEADER_END@
                     23:  */
                     24: 
                     25: 
                     26: #include       <adsp_local.h>
                     27: 
                     28: /*
                     29:  * calcSendFree
                     30:  *
                     31:  * INPUTS:
                     32:  *             sp              ADSP Stream
                     33:  * OUTPUTS:
                     34:  *             # of bytes avail in local send queue
                     35:  */
                     36: int CalcSendQFree(sp)          /* (CCBPtr sp) */
                     37:     CCBPtr sp;
                     38: {
                     39:     int bytes;
                     40:     
                     41:     bytes = calcSendQ(sp);
                     42:     bytes = sp->sbuflen - bytes;
                     43: 
                     44:     if (bytes < 0)
                     45:        return 0;
                     46:     return bytes;
                     47: }
                     48: 
                     49: calcSendQ(sp)
                     50:     CCBPtr sp;
                     51: {
                     52:     register gbuf_t *mp;
                     53:     int bytes = 0;
                     54: 
                     55:     if (sp->sData) {           /* There is data in buffer */
                     56:        if (mp = sp->sbuf_mb) {
                     57:            do {
                     58:                bytes += gbuf_msgsize(mp);
                     59:                mp = gbuf_next(mp);
                     60:            } while (mp);
                     61:        }
                     62:        if (mp = sp->csbuf_mb)
                     63:            bytes += gbuf_msgsize(mp);
                     64:     }
                     65:     return bytes;
                     66: }
                     67: 
                     68: /*
                     69:  * dspStatus
                     70:  * 
                     71:  * INPUTS:
                     72:  *     --> ccbRefNum           refnum of connection end
                     73:  *
                     74:  * OUTPUTS:
                     75:  *     <-- statusCCB           Pointer to the connection control block
                     76:  *     <-- sendQPending        bytes waiting to be sent or acknowledged
                     77:  *     <-- sendQFree           available buffer in bytes of send queue
                     78:  *     <-- recvQPending        bytes waiting to be read from queue
                     79:  *     <-- recvQFree           available buffer in bytes of receive queue
                     80:  *
                     81:  * ERRORS:
                     82:  *     errRefNum               bad connection refnum
                     83:  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
                     84: */
                     85: int adspStatus(sp, pb) /* (DSPPBPtr pb) */
                     86:     CCBPtr sp;
                     87:     register struct adspcmd *pb;
                     88: {
                     89:     OSErr err;
                     90:     short bytes;
                     91:     int        s;
                     92: 
                     93:     if (sp == 0) {
                     94:        pb->ioResult = errRefNum;
                     95:        return EINVAL;
                     96:     }
                     97:        
                     98:     pb->u.statusParams.ccbPtr  = (TPCCB)sp;
                     99:     ATDISABLE(s, sp->lock);    
                    100:        
                    101:     /*
                    102:      * pending bytes in send queue
                    103:      */                
                    104:     if (sp->sData) 
                    105:        bytes = calcSendQ(sp);
                    106:     else
                    107:        bytes = 0;
                    108:     pb->u.statusParams.sendQPending = bytes;
                    109:        
                    110:                                /* available buffer space in send queue */
                    111:     pb->u.statusParams.sendQFree = CalcSendQFree(sp);
                    112:        
                    113:     /*
                    114:      * pending bytes in recv queue
                    115:      */                
                    116:     if (sp->rData)
                    117:        bytes = calcRecvQ(sp);
                    118:     else
                    119:        bytes = 0;
                    120:     pb->u.statusParams.recvQPending = bytes;
                    121:        
                    122:                                /* available buffer space in receive queue */
                    123:     pb->u.statusParams.recvQFree = CalcRecvWdw(sp);
                    124: 
                    125:     ATENABLE(s, sp->lock);     
                    126:     pb->ioResult = 0;
                    127:     adspioc_ack(0, pb->ioc, pb->gref);
                    128:     return 0;
                    129: 
                    130: }

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