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Annotation of kernel/bsd/netccitt/hd_timer.c, revision 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:  * Copyright (c) University of British Columbia, 1984
        !            27:  * Copyright (c) 1990, 1993
        !            28:  *     The Regents of the University of California.  All rights reserved.
        !            29:  *
        !            30:  * This code is derived from software contributed to Berkeley by
        !            31:  * the Laboratory for Computation Vision and the Computer Science Department
        !            32:  * of the University of British Columbia.
        !            33:  *
        !            34:  * Redistribution and use in source and binary forms, with or without
        !            35:  * modification, are permitted provided that the following conditions
        !            36:  * are met:
        !            37:  * 1. Redistributions of source code must retain the above copyright
        !            38:  *    notice, this list of conditions and the following disclaimer.
        !            39:  * 2. Redistributions in binary form must reproduce the above copyright
        !            40:  *    notice, this list of conditions and the following disclaimer in the
        !            41:  *    documentation and/or other materials provided with the distribution.
        !            42:  * 3. All advertising materials mentioning features or use of this software
        !            43:  *    must display the following acknowledgement:
        !            44:  *     This product includes software developed by the University of
        !            45:  *     California, Berkeley and its contributors.
        !            46:  * 4. Neither the name of the University nor the names of its contributors
        !            47:  *    may be used to endorse or promote products derived from this software
        !            48:  *    without specific prior written permission.
        !            49:  *
        !            50:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            51:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            52:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            53:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            54:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            55:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            56:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            57:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            58:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            59:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            60:  * SUCH DAMAGE.
        !            61:  *
        !            62:  *     @(#)hd_timer.c  8.1 (Berkeley) 6/10/93
        !            63:  */
        !            64: 
        !            65: #include <sys/param.h>
        !            66: #include <sys/systm.h>
        !            67: #include <sys/mbuf.h>
        !            68: #include <sys/domain.h>
        !            69: #include <sys/socket.h>
        !            70: #include <sys/protosw.h>
        !            71: #include <sys/errno.h>
        !            72: #include <sys/time.h>
        !            73: #include <sys/kernel.h>
        !            74: 
        !            75: #include <net/if.h>
        !            76: 
        !            77: #include <netccitt/hdlc.h>
        !            78: #include <netccitt/hd_var.h>
        !            79: #include <netccitt/x25.h>
        !            80: 
        !            81: /*
        !            82:  * these can be patched with adb if the
        !            83:  * default values are inappropriate
        !            84:  */
        !            85: 
        !            86: int    hd_t1 = T1;
        !            87: int    hd_t3 = T3;
        !            88: int    hd_n2 = N2;
        !            89: 
        !            90: /*
        !            91:  *  HDLC TIMER 
        !            92:  *
        !            93:  *  This routine is called every 500ms by the kernel. Decrement timer by this
        !            94:  *  amount - if expired then process the event.
        !            95:  */
        !            96: 
        !            97: hd_timer ()
        !            98: {
        !            99:        register struct hdcb *hdp;
        !           100:        register int s = splimp ();
        !           101: 
        !           102:        for (hdp = hdcbhead; hdp; hdp = hdp->hd_next) {
        !           103:                if (hdp->hd_rrtimer && (--hdp->hd_rrtimer == 0)) {
        !           104:                        if (hdp->hd_lasttxnr != hdp->hd_vr)
        !           105:                                hd_writeinternal (hdp, RR, POLLOFF);
        !           106:                }
        !           107: 
        !           108:                if (!(hdp->hd_timer && --hdp->hd_timer == 0))
        !           109:                        continue;
        !           110: 
        !           111:                switch (hdp->hd_state) {
        !           112:                case INIT: 
        !           113:                case DISC_SENT:
        !           114:                        hd_writeinternal (hdp, DISC, POLLON);
        !           115:                        break;
        !           116: 
        !           117:                case ABM: 
        !           118:                        if (hdp->hd_lastrxnr != hdp->hd_vs) {   /* XXX */
        !           119:                                hdp->hd_timeouts++;
        !           120:                                hd_resend_iframe (hdp);
        !           121:                        }
        !           122:                        break;
        !           123: 
        !           124:                case WAIT_SABM: 
        !           125:                        hd_writeinternal (hdp, FRMR, POLLOFF);
        !           126:                        if (++hdp->hd_retxcnt == hd_n2) {
        !           127:                                hdp->hd_retxcnt = 0;
        !           128:                                hd_writeinternal (hdp, SABM, POLLOFF);
        !           129:                                hdp->hd_state = WAIT_UA;
        !           130:                        }
        !           131:                        break;
        !           132: 
        !           133:                case DM_SENT: 
        !           134:                        if (++hdp->hd_retxcnt == hd_n2) {
        !           135:                                /* Notify the packet level. */
        !           136:                                (void) pk_ctlinput (PRC_LINKDOWN, hdp->hd_pkp);
        !           137:                                hdp->hd_retxcnt = 0;
        !           138:                                hdp->hd_state = SABM_SENT;
        !           139:                                hd_writeinternal (hdp, SABM, POLLOFF);
        !           140:                        } else
        !           141:                                hd_writeinternal (hdp, DM, POLLOFF);
        !           142:                        break;
        !           143: 
        !           144:                case WAIT_UA: 
        !           145:                        if (++hdp->hd_retxcnt == hd_n2) {
        !           146:                                hdp->hd_retxcnt = 0;
        !           147:                                hd_writeinternal (hdp, DM, POLLOFF);
        !           148:                                hdp->hd_state = DM_SENT;
        !           149:                        } else
        !           150:                                hd_writeinternal (hdp, SABM, POLLOFF);
        !           151:                        break;
        !           152: 
        !           153:                case SABM_SENT: 
        !           154:                        /* Do this indefinitely. */
        !           155:                        hd_writeinternal (hdp, SABM, POLLON);
        !           156:                        break;
        !           157: 
        !           158:                case DISCONNECTED:
        !           159:                        /*
        !           160:                         * Poll the interface driver flags waiting
        !           161:                         * for the IFF_UP bit to come on.
        !           162:                         */
        !           163:                        if (hdp->hd_ifp->if_flags & IFF_UP)
        !           164:                                hdp->hd_state = INIT;
        !           165: 
        !           166:                }
        !           167:                SET_TIMER (hdp);
        !           168:        }
        !           169: 
        !           170:        splx (s);
        !           171: }

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