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Annotation of XNU/bsd/netat/adsp_Status.c, revision 1.1

1.1     ! root        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: }

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