summaryrefslogtreecommitdiffstats
path: root/mbbsd/cache.c
blob: 494f3f27caf8d5b96d7f6892897d7a051506cb51 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
/* $Id$ */
#include "bbs.h"

#ifdef _BBS_UTIL_C_
#    define log_usies(a, b) ;
#    define abort_bbs(a)    exit(1)
#endif
/*
 * the reason for "safe_sleep" is that we may call sleep during SIGALRM
 * handler routine, while SIGALRM is blocked. if we use the original sleep,
 * we'll never wake up.
 */
unsigned int
safe_sleep(unsigned int seconds)
{
    /* jochang  sleep有問題時用 */
    sigset_t        set, oldset;

    sigemptyset(&set);
    sigprocmask(SIG_BLOCK, &set, &oldset);
    if (sigismember(&oldset, SIGALRM)) {
    unsigned long   retv;
    log_usies("SAFE_SLEEP ", "avoid hang");
    sigemptyset(&set);
    sigaddset(&set, SIGALRM);
    sigprocmask(SIG_UNBLOCK, &set, NULL);
    retv = sleep(seconds);
    sigprocmask(SIG_BLOCK, &set, NULL);
    return retv;
    }
    return sleep(seconds);
}

/*
 * section - SHM
 */
static void
attach_err(int shmkey, char *name)
{
    fprintf(stderr, "[%s error] key = %x\n", name, shmkey);
    fprintf(stderr, "errno = %d: %s\n", errno, strerror(errno));
    exit(1);
}

void           *
attach_shm(int shmkey, int shmsize)
{
    void           *shmptr = (void *)NULL;
    int             shmid;

    shmid = shmget(shmkey, shmsize, 0);
    if (shmid < 0) {
    // SHM should be created by uhash_loader, NOT mbbsd or other utils
    attach_err(shmkey, "shmget");
    } else {
    shmptr = (void *)shmat(shmid, NULL, 0);
    if (shmptr == (void *)-1)
        attach_err(shmkey, "shmat");
    }

    return shmptr;
}

void
attach_SHM(void)
{
    SHM = attach_shm(SHM_KEY, sizeof(SHM_t));
    if (!SHM->loaded)       /* (uhash) assume fresh shared memory is
                 * zeroed */
    exit(1);
    if (SHM->Btouchtime == 0)
    SHM->Btouchtime = 1;
    bcache = SHM->bcache;
    numboards = SHM->Bnumber;

    GLOBALVAR = SHM->GLOBALVAR;
    if (SHM->Ptouchtime == 0)
    SHM->Ptouchtime = 1;

    if (SHM->Ftouchtime == 0)
    SHM->Ftouchtime = 1;
}

/* ----------------------------------------------------- */
/* semaphore : for critical section                      */
/* ----------------------------------------------------- */
#define SEM_FLG        0600 /* semaphore mode */

#ifndef __FreeBSD__
/* according to X/OPEN, we have to define it ourselves */
union semun {
    int             val;    /* value for SETVAL */
    struct semid_ds *buf;   /* buffer for IPC_STAT, IPC_SET */
    unsigned short int *array;  /* array for GETALL, SETALL */
    struct seminfo *__buf;  /* buffer for IPC_INFO */
};
#endif

void
sem_init(int semkey, int *semid)
{
    union semun     s;

    s.val = 1;
    *semid = semget(semkey, 1, 0);
    if (*semid == -1) {
    *semid = semget(semkey, 1, IPC_CREAT | SEM_FLG);
    if (*semid == -1)
        attach_err(semkey, "semget");
    semctl(*semid, 0, SETVAL, s);
    }
}

void
sem_lock(int op, int semid)
{
    struct sembuf   sops;

    sops.sem_num = 0;
    sops.sem_flg = SEM_UNDO;
    sops.sem_op = op;
    if (semop(semid, &sops, 1)) {
    perror("semop");
    exit(1);
    }
}

/*
 * section - user cache(including uhash)
 */
/* uhash ****************************************** */
/*
 * the design is this: we use another stand-alone program to create and load
 * data into the hash. (that program could be run in rc-scripts or something
 * like that) after loading completes, the stand-alone program sets loaded to
 * 1 and exits.
 * 
 * the bbs exits if it can't attach to the shared memory or the hash is not
 * loaded yet.
 */

void
add_to_uhash(int n, char *id)
{
    int            *p, h = StringHash(id);
    int             times;
    strlcpy(SHM->userid[n], id, sizeof(SHM->userid[n]));

    p = &(SHM->hash_head[h]);

    for (times = 0; times < MAX_USERS && *p != -1; ++times)
    p = &(SHM->next_in_hash[*p]);

    if (times == MAX_USERS)
    abort_bbs(0);

    SHM->next_in_hash[*p = n] = -1;
}

void
remove_from_uhash(int n)
{
/*
 * note: after remove_from_uhash(), you should add_to_uhash() (likely with a
 * different name)
 */
    int             h = StringHash(SHM->userid[n]);
    int            *p = &(SHM->hash_head[h]);
    int             times;

    for (times = 0; times < MAX_USERS && (*p != -1 && *p != n); ++times)
    p = &(SHM->next_in_hash[*p]);

    if (times == MAX_USERS)
    abort_bbs(0);

    if (*p == n)
    *p = SHM->next_in_hash[n];
}

int
searchuser(char *userid)
{
    int             h, p, times;
    h = StringHash(userid);
    p = SHM->hash_head[h];

    for (times = 0; times < MAX_USERS && p != -1 && p < MAX_USERS ; ++times) {
    if (strcasecmp(SHM->userid[p], userid) == 0) {
        strcpy(userid, SHM->userid[p]);
        return p + 1;
    }
    p = SHM->next_in_hash[p];
    }

    return 0;
}

int
getuser(char *userid)
{
    int             uid;

    if ((uid = searchuser(userid)))
    passwd_query(uid, &xuser);
    xuser.money = moneyof(uid);
    return uid;
}

char           *
getuserid(int num)
{
    if (--num >= 0 && num < MAX_USERS)
    return ((char *)SHM->userid[num]);
    return NULL;
}

void
setuserid(int num, char *userid)
{
    if (num > 0 && num <= MAX_USERS) {
    if (num > SHM->number)
        SHM->number = num;
    else
        remove_from_uhash(num - 1);
    add_to_uhash(num - 1, userid);
    }
}

/* 0 ==> 找過期帳號 */
/* 1 ==> 建立新帳號 */
/* should do it by searching "" in the hash */
int
searchnewuser(int mode)
{
    register int    i, num;

    num = SHM->number;
    i = 0;

    /* 為什麼這邊不用 hash table 去找而要用 linear search? */
    while (i < num) {
    if (!SHM->userid[i++][0])
        return i;
    }
    if (mode && (num < MAX_USERS))
    return num + 1;
    return 0;
}

#ifndef _BBS_UTIL_C_
char           *
u_namearray(char buf[][IDLEN + 1], int *pnum, char *tag)
{
    register char  *ptr, tmp;
    register int    n, total;
    char            tagbuf[STRLEN];
    int             ch, ch2, num;

    if (*tag == '\0') {
    *pnum = SHM->number;
    return SHM->userid[0];
    }
    for (n = 0; tag[n]; n++)
    tagbuf[n] = chartoupper(tag[n]);
    tagbuf[n] = '\0';
    ch = tagbuf[0];
    ch2 = ch - 'A' + 'a';
    total = SHM->number;
    for (n = num = 0; n < total; n++) {
    ptr = SHM->userid[n];
    tmp = *ptr;
    if (tmp == ch || tmp == ch2) {
        if (chkstr(tag, tagbuf, ptr))
        strcpy(buf[num++], ptr);
    }
    }
    *pnum = num;
    return buf[0];
}
#endif

void
getnewutmpent(userinfo_t * up)
{
/* Ptt:這裡加上 hash 觀念找空的 utmp */
    register int    i, p;
    register userinfo_t *uentp;
    for (i = 0, p = StringHash(up->userid) % USHM_SIZE; i < USHM_SIZE; i++, p++) {
    if (p == USHM_SIZE)
        p = 0;
    uentp = &(SHM->uinfo[p]);
    if (!(uentp->pid)) {
        memcpy(uentp, up, sizeof(userinfo_t));
        currutmp = uentp;
        return;
    }
    }
    exit(1);
}

int
apply_ulist(int (*fptr) (userinfo_t *))
{
    register userinfo_t *uentp;
    register int    i, state;

    for (i = 0; i < USHM_SIZE; i++) {
    uentp = &(SHM->uinfo[i]);
    if (uentp->pid && (PERM_HIDE(currutmp) || !PERM_HIDE(uentp)))
        if ((state = (*fptr) (uentp)))
        return state;
    }
    return 0;
}

userinfo_t     *
search_ulist(int uid)
{
    return search_ulistn(uid, 1);
}

userinfo_t     *
search_ulist_pid(int pid)
{
    register int    i = 0, j, start = 0, end = SHM->UTMPnumber - 1;
    register userinfo_t **ulist;
    if (end == -1)
    return NULL;
    ulist = SHM->sorted[SHM->currsorted][7];
    for (i = ((start + end) / 2);; i = (start + end) / 2) {
    j = pid - ulist[i]->pid;
    if (!j) {
        return (userinfo_t *) (ulist[i]);
    }
    if (end == start) {
        break;
    } else if (i == start) {
        i = end;
        start = end;
    } else if (j > 0)
        start = i;
    else
        end = i;
    }
    return 0;
}

userinfo_t     *
search_ulistn(int uid, int unum)
{
    register int    i = 0, j, start = 0, end = SHM->UTMPnumber - 1;
    register userinfo_t **ulist;
    if (end == -1)
    return NULL;
    ulist = SHM->sorted[SHM->currsorted][6];
    for (i = ((start + end) / 2);; i = (start + end) / 2) {
    j = uid - ulist[i]->uid;
    if (j == 0) {
        for (; i > 0 && uid == ulist[i - 1]->uid; --i)
        ;/* 指到第一筆 */
        if ( i + unum - 1 >= 0 &&
         (ulist[i + unum - 1] != NULL &&
          uid == ulist[i + unum - 1]->uid) )
        return (userinfo_t *) (ulist[i + unum - 1]);
        break;      /* 超過範圍 */
    }
    if (end == start) {
        break;
    } else if (i == start) {
        i = end;
        start = end;
    } else if (j > 0)
        start = i;
    else
        end = i;
    }
    return 0;
}

userinfo_t     *
search_ulist_userid(char *userid)
{
    register int    i = 0, j, start = 0, end = SHM->UTMPnumber - 1;
    register userinfo_t **ulist;
    if (end == -1)
    return NULL;
    ulist = SHM->sorted[SHM->currsorted][0];
    for (i = ((start + end) / 2);; i = (start + end) / 2) {
    j = strcasecmp(userid, ulist[i]->userid);
    if (!j) {
        return (userinfo_t *) (ulist[i]);
    }
    if (end == start) {
        break;
    } else if (i == start) {
        i = end;
        start = end;
    } else if (j > 0)
        start = i;
    else
        end = i;
    }
    return 0;
}

#ifndef _BBS_UTIL_C_
int
count_logins(int uid, int show)
{
    register int    i = 0, j, start = 0, end = SHM->UTMPnumber - 1, count;
    register userinfo_t **ulist;
    if (end == -1)
    return 0;
    ulist = SHM->sorted[SHM->currsorted][6];
    for (i = ((start + end) / 2);; i = (start + end) / 2) {
    j = uid - ulist[i]->uid;
    if (!j) {
        for (; i > 0 && uid == ulist[i - 1]->uid; i--); /* 指到第一筆 */
        for (count = 0; uid == ulist[i + count]->uid; count++) {
        if (show)
            prints("(%d) 目前狀態為: %-17.16s(來自 %s)\n",
               count + 1, modestring(ulist[i + count], 0),
               ulist[i + count]->from);
        }
        return count;
    }
    if (end == start) {
        break;
    } else if (i == start) {
        i = end;
        start = end;
    } else if (j > 0)
        start = i;
    else
        end = i;
    }
    return 0;
}

void
purge_utmp(userinfo_t * uentp)
{
    logout_friend_online(uentp);
    memset(uentp, 0, sizeof(userinfo_t));
    SHM->UTMPneedsort = 1;
}
#endif

/*
 * section - money cache
 */
int
setumoney(int uid, int money)
{
    SHM->money[uid - 1] = money;
    passwd_update_money(uid);
    return SHM->money[uid - 1];
}

int
deumoney(int uid, int money)
{
    if (money < 0 && moneyof(uid) < -money)
    return setumoney(uid, 0);
    else
    return setumoney(uid, SHM->money[uid - 1] + money);
}

int
demoney(int money)
{
    return deumoney(usernum, money);
}

int
moneyof(int uid)
{               /* ptt 改進金錢處理效率 */
    return SHM->money[uid - 1];
}

/*
 * section - utmp
 */
#if !defined(_BBS_UTIL_C_) /* _BBS_UTIL_C_ 不會有 utmp */
void
setutmpmode(unsigned int mode)
{
    if (currstat != mode)
    currutmp->mode = currstat = mode;

    /* 追蹤使用者 */
    if (HAS_PERM(PERM_LOGUSER)) {
    char            msg[200];
    snprintf(msg, sizeof(msg), "%s setutmpmode to %s(%d) at %s",
         cuser->userid, modestring(currutmp, 0), mode, Cdate(&COMMON_TIME));
    log_user(msg);
    }
}
#endif

/*
 * section - board cache
 */
void touchbtotal(int bid) {
    SHM->total[bid - 1] = 0;
    SHM->lastposttime[bid - 1] = 0;
}

void
touchdircache(int bid)
{
#if DIRCACHESIZE
    int            *i = (int *)&SHM->dircache[bid - 1][0].filename[0];
    *i = 0;
#endif
}

#if DIRCACHESIZE
void
load_fileheader_cache(int bid, char *direct)
{
    int             num = getbtotal(bid), n_bottom = getbottomtotal(bid);
    int             n = num - DIRCACHESIZE + n_bottom + 1;
    int             dirsize = DIRCACHESIZE-n_bottom;
    if (n<1)
       {
          n=1;
          dirsize=num;
       }
    if (SHM->Bbusystate != 1 && COMMON_TIME - SHM->busystate_b[bid - 1] >= 10) {
    SHM->busystate_b[bid - 1] = COMMON_TIME;
        if(n_bottom)
           { 
             char path[256];
             setbfile(path, currboard, ".BOTTOM");
             get_records(path, &SHM->dircache[bid - 1][dirsize],
                         sizeof(fileheader_t), 1, n_bottom);
           }
    get_records(direct, SHM->dircache[bid - 1],
             sizeof(fileheader_t), n, dirsize);
    SHM->busystate_b[bid - 1] = 0;
    } else {
    safe_sleep(1);
    }
}

int
get_fileheader_cache(int bid, char *direct, fileheader_t * headers,
             int recbase, int nlines)
{
    int             ret, n, num;

    num = getbtotal(bid);

    ret = num - recbase + 1,
    n = (num - DIRCACHESIZE + 1);


    if (SHM->dircache[bid - 1][0].filename[0] == '\0')
    load_fileheader_cache(bid, direct);
    if (n < 1)
    n = recbase - 1;
    else
    n = recbase - n;
    if (n < 0)
    n = 0;
    if (ret > nlines)
    ret = nlines;
    memcpy(headers, &(SHM->dircache[bid - 1][n]), sizeof(fileheader_t) * ret);
    return ret;
}
#endif

static int
cmpboardname(boardheader_t ** brd, boardheader_t ** tmp)
{
    return strcasecmp((*brd)->brdname, (*tmp)->brdname);
}

static int
cmpboardclass(boardheader_t ** brd, boardheader_t ** tmp)
{
    return (strncmp((*brd)->title, (*tmp)->title, 4) << 8) +
    strcasecmp((*brd)->brdname, (*tmp)->brdname);
}

static void
sort_bcache(void)
{
    int             i;
    /* critical section 不能單獨呼叫 呼叫reload_bcache or reset_board */
    for (i = 0; i < SHM->Bnumber; i++) {
    SHM->bsorted[1][i] = SHM->bsorted[0][i] = &bcache[i];
    }
    qsort(SHM->bsorted[0], SHM->Bnumber, sizeof(boardheader_t *),
      (QCAST) cmpboardname);
    qsort(SHM->bsorted[1], SHM->Bnumber, sizeof(boardheader_t *),
      (QCAST) cmpboardclass);
}

void
reload_bcache(void)
{
    if (SHM->Bbusystate) {
    safe_sleep(1);
    }
    else {
    int             fd, i;

    SHM->Bbusystate = 1;
    if ((fd = open(fn_board, O_RDONLY)) > 0) {
        SHM->Bnumber =
        read(fd, bcache, MAX_BOARD * sizeof(boardheader_t)) /
        sizeof(boardheader_t);
        close(fd);
    }
    memset(SHM->lastposttime, 0, MAX_BOARD * sizeof(time_t));
    /* 等所有 boards 資料更新後再設定 uptime */
    SHM->Buptime = SHM->Btouchtime;
    log_usies("CACHE", "reload bcache");
    sort_bcache();
    for (i = 0; i < SHM->Bnumber; ++i) {
        bcache[i].firstchild[0] = NULL;
        bcache[i].firstchild[1] = NULL;
    }
    SHM->Bbusystate = 0;
    }
}

void resolve_boards(void)
{
    while (SHM->Buptime < SHM->Btouchtime) {
    reload_bcache();
    }
    numboards = SHM->Bnumber;
}

void touch_boards(void)
{
    SHM->Btouchtime = COMMON_TIME;
    numboards = -1;
    resolve_boards();
}
void addbrd_touchcache(void)
{
    SHM->Bnumber++;
    numboards = SHM->Bnumber;
    reset_board(numboards);
}

void
reset_board(int bid) /* XXXbid: from 1 */
{               /* Ptt: 這樣就不用老是touch board了 */
    int             fd, i, nuser;
    boardheader_t  *bhdr;

    if (--bid < 0)
    return;
    if (SHM->Bbusystate || COMMON_TIME - SHM->busystate_b[bid] < 10) {
    safe_sleep(1);
    } else {
    SHM->busystate_b[bid] = COMMON_TIME;
    nuser = bcache[bid].nuser;

    bhdr = bcache;
    bhdr += bid;
    if ((fd = open(fn_board, O_RDONLY)) > 0) {
        lseek(fd, (off_t) (bid * sizeof(boardheader_t)), SEEK_SET);
        read(fd, bhdr, sizeof(boardheader_t));
        close(fd);
    }
    sort_bcache();
    for (i = 0; i < SHM->Bnumber; i++) {
        bcache[i].firstchild[0] = NULL;
        bcache[i].firstchild[1] = NULL;
    }
    SHM->busystate_b[bid] = 0;

    buildBMcache(bid + 1); /* XXXbid */
    }
}

#ifndef _BBS_UTIL_C_ /* because of HasPerm() in board.c */
int
apply_boards(int (*func) (boardheader_t *))
{
    register int    i;
    register boardheader_t *bhdr;

    for (i = 0, bhdr = bcache; i < numboards; i++, bhdr++) {
    if (!(bhdr->brdattr & BRD_GROUPBOARD) && HasPerm(bhdr) &&
        (*func) (bhdr) == QUIT)
        return QUIT;
    }
    return 0;
}
#endif

boardheader_t  *
getbcache(int bid)
{               /* Ptt改寫 */
    return bcache + bid - 1;
}

int
getbtotal(int bid)
{
    return SHM->total[bid - 1];
}
int
getbottomtotal(int bid)
{
    return SHM->n_bottom[bid-1]; 
}

void
setbottomtotal(int bid)
{
    boardheader_t  *bh = getbcache(bid);
    char            genbuf[256];
    setbfile(genbuf, bh->brdname, ".BOTTOM");
    SHM->n_bottom[bid-1]=get_num_records(genbuf, sizeof(fileheader_t));
}
void
setbtotal(int bid)
{
    boardheader_t  *bh = getbcache(bid);
    struct stat     st;
    char            genbuf[256];
    int             num, fd;

    setbfile(genbuf, bh->brdname, ".DIR");
    if ((fd = open(genbuf, O_RDWR)) < 0)
    return;         /* .DIR掛了 */
    fstat(fd, &st);
    num = st.st_size / sizeof(fileheader_t);
    SHM->total[bid - 1] = num;

    if (num > 0) {
    lseek(fd, (off_t) (num - 1) * sizeof(fileheader_t), SEEK_SET);
    if (read(fd, genbuf, FNLEN) >= 0) {
        SHM->lastposttime[bid - 1] = (time_t) atoi(&genbuf[2]);
    }
    } else
    SHM->lastposttime[bid - 1] = 0;
    close(fd);
    if (num)
    touchdircache(bid);
}

void
touchbpostnum(int bid, int delta)
{
    int            *total = &SHM->total[bid - 1];
    if (*total)
    *total += delta;
}

int
getbnum(const char *bname)
{
    register int    i = 0, j, start = 0, end = SHM->Bnumber - 1;
    register boardheader_t **bhdr;
    bhdr = SHM->bsorted[0];
    for (i = ((start + end) / 2);; i = (start + end) / 2) {
    if (!(j = strcasecmp(bname, bhdr[i]->brdname)))
        return (int)(bhdr[i] - bcache + 1);
    if (end == start) {
        break;
    } else if (i == start) {
        i = end;
        start = end;
    } else if (j > 0)
        start = i;
    else
        end = i;
    }
    return 0;
}

int
haspostperm(char *bname)
{
    register int    i;
    char            buf[200];

    setbfile(buf, bname, fn_water);
    if (belong(buf, cuser->userid))
    return 0;

    if (!strcasecmp(bname, DEFAULT_BOARD))
    return 1;

    if (!strcasecmp(bname, "PttLaw"))
    return 1;

    if (!HAS_PERM(PERM_POST))
    return 0;

    if (!(i = getbnum(bname)))
    return 0;

    /* 秘密看板特別處理 */
    if (bcache[i - 1].brdattr & BRD_HIDE)
    return 1;

    i = bcache[i - 1].level;

    if (HAS_PERM(PERM_VIOLATELAW) && (i & PERM_VIOLATELAW))
    return 1;
    else if (HAS_PERM(PERM_VIOLATELAW))
    return 0;

    return HAS_PERM(i & ~PERM_POST);
}

void buildBMcache(int bid) /* bid starts from 1 */
{
    char    s[IDLEN * 3 + 3], *ptr;
    int     i, uid;
    --bid;

    strncpy(s, bcache[bid].BM, sizeof(s));
    for( i = 0 ; s[i] != 0 ; ++i )
    if( !isalpha(s[i]) && !isdigit(s[i]) )
            s[i] = ' ';

    for( ptr = strtok(s, " "), i = 0 ;
     i < MAX_BMs && ptr != NULL  ;
     ptr = strtok(NULL, " "), ++i  )
    if( (uid = searchuser(ptr)) != 0 )
        SHM->BMcache[bid][i] = uid;
    for( ; i < MAX_BMs ; ++i )
    SHM->BMcache[bid][i] = -1;
}

int is_BM_cache(int bid) /* bid starts from 1 */
{
    --bid;
    if( currutmp->uid == SHM->BMcache[bid][0] ||
    currutmp->uid == SHM->BMcache[bid][1] ||
    currutmp->uid == SHM->BMcache[bid][2] ||
    currutmp->uid == SHM->BMcache[bid][3]    ){
    cuser->userlevel |= PERM_BM;
    return 1;
    }
    return 0;
}

/*-------------------------------------------------------*/
/* PTT  cache                                            */
/*-------------------------------------------------------*/
/* cache for 動態看板 */
void
reload_pttcache(void)
{
    if (SHM->Pbusystate)
    safe_sleep(1);
    else {          /* jochang: temporary workaround */
    fileheader_t    item, subitem;
    char            pbuf[256], buf[256], *chr;
    FILE           *fp, *fp1, *fp2;
    int             id, section = 0;

    SHM->Pbusystate = 1;
    SHM->max_film = 0;
    bzero(SHM->notes, sizeof(SHM->notes));
    setapath(pbuf, "Note");
    setadir(buf, pbuf);
    id = 0;
    if ((fp = fopen(buf, "r"))) {
        while (fread(&item, sizeof(item), 1, fp)) {
        if (item.title[3] == '<' && item.title[8] == '>') {
            snprintf(buf, sizeof(buf), "%s/%s", pbuf, item.filename);
            setadir(buf, buf);
            if (!(fp1 = fopen(buf, "r")))
            continue;
            SHM->next_refresh[section] = SHM->n_notes[section] = id;
            section++;
            while (fread(&subitem, sizeof(subitem), 1, fp1)) {
            snprintf(buf, sizeof(buf),
                 "%s/%s/%s", pbuf, item.filename,
                 subitem.filename);
            if (!(fp2 = fopen(buf, "r")))
                continue;
            fread(SHM->notes[id], sizeof(char), 200 * 11, fp2);
            SHM->notes[id][200 * 11 - 1] = 0;
            id++;
            fclose(fp2);
            if (id >= MAX_MOVIE)
                break;
            }
            fclose(fp1);
            if (id >= MAX_MOVIE || section >= MAX_MOVIE_SECTION)
            break;
        }
        }
        fclose(fp);
    }
    SHM->next_refresh[section] = -1;
    SHM->n_notes[section] = SHM->max_film = id - 1;
    SHM->max_history = SHM->max_film - 2;
    if (SHM->max_history > MAX_HISTORY - 1)
        SHM->max_history = MAX_HISTORY - 1;
    if (SHM->max_history < 0)
        SHM->max_history = 0;

    fp = fopen("etc/today_is", "r");
    if (fp) {
        fgets(SHM->today_is, 15, fp);
        if ((chr = strchr(SHM->today_is, '\n')))
        *chr = 0;
        SHM->today_is[15] = 0;
        fclose(fp);
    }
    /* 等所有資料更新後再設定 uptime */

    SHM->Puptime = SHM->Ptouchtime;
    log_usies("CACHE", "reload pttcache");
    SHM->Pbusystate = 0;
    }
}

void
resolve_garbage(void)
{
    int             count = 0;

    while (SHM->Puptime < SHM->Ptouchtime) {    /* 不用while等 */
    reload_pttcache();
    if (count++ > 10 && SHM->Pbusystate) {
        /*
         * Ptt: 這邊會有問題  load超過10 秒會所有進loop的process tate = 0
         * 這樣會所有prcosee都會在load 動態看板 會造成load大增
         * 但沒有用這個function的話 萬一load passwd檔的process死了
         * 又沒有人把他 解開  同樣的問題發生在reload passwd
         */
        SHM->Pbusystate = 0;
#ifndef _BBS_UTIL_C_
        log_usies("CACHE", "refork Ptt dead lock");
#endif
    }
    }
}

/*-------------------------------------------------------*/
/* PTT's cache                                           */
/*-------------------------------------------------------*/
/* cache for from host 與最多上線人數 */
static void
reload_fcache(void)
{
    if (SHM->Fbusystate)
    safe_sleep(1);
    else {
    FILE           *fp;

    SHM->Fbusystate = 1;
    bzero(SHM->domain, sizeof(SHM->domain));
    if ((fp = fopen("etc/domain_name_query", "r"))) {
        char            buf[256], *po;

        SHM->top = 0;
        while (fgets(buf, sizeof(buf), fp)) {
        if (buf[0] && buf[0] != '#' && buf[0] != ' ' &&
            buf[0] != '\n') {
            sscanf(buf, "%s", SHM->domain[SHM->top]); // XXX check buffer size
            po = buf + strlen(SHM->domain[SHM->top]);
            while (*po == ' ')
            po++;
            strncpy(SHM->replace[SHM->top], po, 49);
            SHM->replace[SHM->top]
            [strlen(SHM->replace[SHM->top]) - 1] = 0;
            (SHM->top)++;
            if (SHM->top == MAX_FROM)
            break;
        }
        }
        fclose(fp);
    }
    SHM->max_user = 0;

    /* 等所有資料更新後再設定 uptime */
    SHM->Fuptime = SHM->Ftouchtime;
#if !defined(_BBS_UTIL_C_)
    log_usies("CACHE", "reload fcache");
#endif
    SHM->Fbusystate = 0;
    }
}

void
resolve_fcache(void)
{
    while (SHM->Fuptime < SHM->Ftouchtime)
    reload_fcache();
}

/*
 * section - hbfl (hidden board friend list)
 */
void
hbflreload(int bid)
{
    int             hbfl[MAX_FRIEND + 1], i, num, uid;
    char            buf[128];
    FILE           *fp;

    memset(hbfl, 0, sizeof(hbfl));
    setbfile(buf, bcache[bid - 1].brdname, fn_visable);
    if ((fp = fopen(buf, "r")) != NULL) {
    for (num = 1; num <= MAX_FRIEND; ++num) {
        if (fgets(buf, sizeof(buf), fp) == NULL)
        break;
        for (i = 0; buf[i] != 0; ++i)
        if (buf[i] == ' ') {
            buf[i] = 0;
            break;
        }
        if (strcasecmp("guest", buf) == 0 ||
        (uid = searchuser(buf)) == 0) {
        --num;
        continue;
        }
        hbfl[num] = uid;
    }
    fclose(fp);
    }
    hbfl[0] = COMMON_TIME;
    memcpy(SHM->hbfl[bid], hbfl, sizeof(hbfl));
}

int
hbflcheck(int bid, int uid)
{
    int             i;

    if (SHM->hbfl[bid][0] < login_start_time - HBFLexpire)
    hbflreload(bid);
    for (i = 1; SHM->hbfl[bid][i] != 0 && i <= MAX_FRIEND; ++i) {
    if (SHM->hbfl[bid][i] == uid)
        return 0;
    }
    return 1;
}