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Annotation of XNU/bsd/netat/adsp_attention.c, revision 1.1.1.1

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:  * dspAttention.c 
                     24:  *
                     25:  * From Mike Shoemaker v01.05  03/16/90 mbs
                     26:  */
                     27: /*
                     28:  * Change log:
                     29:  *   06/29/95 - Modified to handle flow control for writing (Tuyen Nguyen)
                     30:  *    Modified for MP, 1996 by Tuyen Nguyen
                     31:  *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
                     32:  */
                     33: 
                     34: #include <sys/errno.h>
                     35: #include <sys/types.h>
                     36: #include <sys/param.h>
                     37: #include <machine/spl.h>
                     38: #include <sys/systm.h>
                     39: #include <sys/kernel.h>
                     40: #include <sys/proc.h>
                     41: #include <sys/filedesc.h>
                     42: #include <sys/fcntl.h>
                     43: #include <sys/mbuf.h>
                     44: #include <sys/socket.h>
                     45: 
                     46: #include <netat/sysglue.h>
                     47: #include <netat/appletalk.h>
                     48: #include <netat/at_pcb.h>
                     49: #include <netat/debug.h>
                     50: #include <netat/adsp.h>
                     51: #include <netat/adsp_internal.h>
                     52: 
                     53: /*
                     54:  * dspAttention
                     55:  * 
                     56:  * INPUTS:
                     57:  *     --> ccbRefNum           refnum of connection end
                     58:  *     --> attnCode            client attention code
                     59:  *     --> attnSize            size in bytes of attention data
                     60:  *     --> attnData            pointer to attention data
                     61:  *     --> attnInterval        attention retransmit interval 
                     62:  *                             (ignored by ADSP 1.5 & up)
                     63:  *
                     64:  * OUTPUTS:
                     65:  *     none
                     66:  *
                     67:  * ERRORS:
                     68:  *     errRefNum               bad connection refnum
                     69:  *     errState                connection is not open
                     70:  *     errAttention            attention message too long
                     71:  *     errAborted              request aborted by Remove or Close call
                     72:  */
                     73: int adspAttention(sp, pb)      /* (DSPPBPtr pb) */
                     74:     register struct adspcmd *pb;
                     75:     register CCBPtr sp;
                     76: {
                     77:     int        s;
                     78:     register gbuf_t *mp, *nmp;
                     79:     unsigned char uerr;
                     80:        
                     81:     if (sp == 0) {
                     82:        pb->ioResult = errRefNum;
                     83:        return EINVAL;
                     84:     }
                     85:        
                     86:     if (sp->state != sOpen) {  /* If we're not open, tell user to go away */
                     87:        pb->ioResult = errState;
                     88:        uerr = ENOTCONN;
                     89: l_err:
                     90:        atalk_notify(sp->gref, uerr);
                     91:        gbuf_freem(pb->mp);
                     92:        return 0;
                     93:     }
                     94:        
                     95:     if (pb->u.attnParams.attnSize > attnBufSize) /* If data too big, bye-bye */
                     96:     {
                     97:        pb->ioResult = errAttention;
                     98:        uerr = ERANGE;
                     99:        goto l_err;
                    100:     }
                    101: 
                    102:     /* The 1st mbuf in the pb->mp chain (mp) is the adspcmd structure. 
                    103:        The 2nd mbuf (nmp) will be the beginning of the data. */
                    104:     mp = pb->mp;
                    105:     if (pb->u.attnParams.attnSize) {
                    106:         nmp = gbuf_cont(mp);
                    107:        if (gbuf_len(mp) > sizeof(struct adspcmd)) {
                    108:            if ((nmp = gbuf_dupb(mp)) == 0) {
                    109:                gbuf_wset(mp, sizeof(struct adspcmd));
                    110:                uerr = ENOBUFS;
                    111:                goto l_err;
                    112:            }
                    113:            gbuf_wset(mp, sizeof(struct adspcmd));
                    114:            gbuf_rinc(nmp, sizeof(struct adspcmd));
                    115:            gbuf_cont(nmp) = gbuf_cont(mp);
                    116:            gbuf_cont(mp) = nmp;
                    117:        }
                    118:     }
                    119:     pb->ioDirection = 1;       /* outgoing attention data */
                    120:     ATDISABLE(s, sp->lock);
                    121:     if (sp->sapb) {            /* Pending attentions already? */
                    122:        qAddToEnd(&sp->sapb, pb); /* Just add to end of queue */
                    123:        ATENABLE(s, sp->lock);
                    124:     } else {
                    125:        sp->sendAttnData = 1;   /* Start off this attention */
                    126:        pb->qLink = 0;
                    127:        sp->sapb = pb;
                    128:        ATENABLE(s, sp->lock);
                    129:        CheckSend(sp);
                    130:     }
                    131:     pb->ioResult = 1;  /* indicate that the IO is not complete */
                    132:     return 0;
                    133: }

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