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Annotation of 43BSDTahoe/etc/timed/correct.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1985 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: static char sccsid[] = "@(#)correct.c  2.5 (Berkeley) 6/18/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: #include "globals.h"
        !            23: #include <protocols/timed.h>
        !            24: 
        !            25: #ifdef MEASURE
        !            26: extern FILE *fp;
        !            27: #endif
        !            28: 
        !            29: /* 
        !            30:  * `correct' sends to the slaves the corrections for their clocks
        !            31:  */
        !            32: 
        !            33: correct(avdelta)
        !            34: long avdelta;
        !            35: {
        !            36:        int i;
        !            37:        int corr;
        !            38:        struct timeval adjlocal;
        !            39:        struct tsp msgs;
        !            40:        struct timeval mstotvround();
        !            41:        struct tsp *answer, *acksend();
        !            42: 
        !            43: #ifdef MEASURE
        !            44:        for(i=0; i<slvcount; i++) {
        !            45:                if (hp[i].delta == HOSTDOWN)
        !            46:                        fprintf(fp, "%s\t", "down");
        !            47:                else { 
        !            48:                        fprintf(fp, "%d\t", hp[i].delta);
        !            49:                }
        !            50:        }
        !            51:        fprintf(fp, "\n");
        !            52: #endif
        !            53:        corr = avdelta - hp[0].delta;
        !            54:        adjlocal = mstotvround(&corr);
        !            55:        adjclock(&adjlocal);
        !            56: #ifdef MEASURE
        !            57:        fprintf(fp, "%d\t", corr);
        !            58: #endif
        !            59: 
        !            60:        for(i=1; i<slvcount; i++) {
        !            61:                if (hp[i].delta != HOSTDOWN)  {
        !            62:                        corr = avdelta - hp[i].delta;
        !            63:                        msgs.tsp_time = mstotvround(&corr);
        !            64:                        msgs.tsp_type = (u_char)TSP_ADJTIME;
        !            65:                        (void)strcpy(msgs.tsp_name, hostname);
        !            66:                        answer = acksend(&msgs, &hp[i].addr, hp[i].name,
        !            67:                            TSP_ACK, (struct netinfo *)NULL);
        !            68:                        if (answer == NULL) {
        !            69:                                hp[i].delta = HOSTDOWN;
        !            70: #ifdef MEASURE
        !            71:                                fprintf(fp, "%s\t", "down");
        !            72:                        } else {
        !            73:                                fprintf(fp, "%d\t", corr);
        !            74: #endif
        !            75:                        }
        !            76:                } else {
        !            77: #ifdef MEASURE
        !            78:                        fprintf(fp, "%s\t", "down");
        !            79: #endif
        !            80:                }
        !            81:        }
        !            82: #ifdef MEASURE
        !            83:        fprintf(fp, "\n");
        !            84: #endif
        !            85: }
        !            86: 
        !            87: /* 
        !            88:  * `mstotvround' rounds up the value of the argument to the 
        !            89:  * nearest multiple of five, and converts it into a timeval 
        !            90:  */
        !            91:  
        !            92: struct timeval mstotvround(x)
        !            93: int *x;
        !            94: {
        !            95:        int temp;
        !            96:        struct timeval adj;
        !            97: 
        !            98:        temp = *x % 5;
        !            99:        if (temp >= 3)
        !           100:                *x = *x-temp+5;
        !           101:        else {
        !           102:                if (temp <= -3)
        !           103:                        *x = *x - temp -5;
        !           104:                else 
        !           105:                        *x = *x-temp;
        !           106:        }
        !           107:        adj.tv_sec = *x/1000;
        !           108:        adj.tv_usec = (*x-adj.tv_sec*1000)*1000;
        !           109:        if (adj.tv_usec < 0) {
        !           110:                adj.tv_usec += 1000000;
        !           111:                adj.tv_sec--;
        !           112:        }
        !           113:        return(adj);
        !           114: }
        !           115: 
        !           116: adjclock(corr)
        !           117: struct timeval *corr;
        !           118: {
        !           119:        struct timeval now;
        !           120: 
        !           121:        if (timerisset(corr)) {
        !           122:                if (corr->tv_sec < MAXADJ && corr->tv_sec > - MAXADJ) {
        !           123:                        (void)adjtime(corr, (struct timeval *)0);
        !           124:                } else {
        !           125:                        syslog(LOG_WARNING,
        !           126:                            "clock correction too large to adjust (%d sec)",
        !           127:                            corr->tv_sec);
        !           128:                        (void) gettimeofday(&now, (struct timezone *)0);
        !           129:                        timevaladd(&now, corr);
        !           130:                        if (settimeofday(&now, (struct timezone *)0) < 0)
        !           131:                                syslog(LOG_ERR, "can't set time");
        !           132:                }
        !           133:        }
        !           134: }
        !           135: 
        !           136: timevaladd(tv1, tv2)
        !           137:        register struct timeval *tv1, *tv2;
        !           138: {
        !           139:        
        !           140:        tv1->tv_sec += tv2->tv_sec;
        !           141:        tv1->tv_usec += tv2->tv_usec;
        !           142:        if (tv1->tv_usec >= 1000000) {
        !           143:                tv1->tv_sec++;
        !           144:                tv1->tv_usec -= 1000000;
        !           145:        }
        !           146:        if (tv1->tv_usec < 0) {
        !           147:                tv1->tv_sec--;
        !           148:                tv1->tv_usec += 1000000;
        !           149:        }
        !           150: }

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