path: root/mbbsd/cache.c

/* $Id$ */
#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);
    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 */
    if(SHM->money[uid - 1] < 0)
     {
        SHM->money[uid - 1] = passwd_query_money(uid);
     }
    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);
    int             n = num - DIRCACHESIZE + 1;
    if (SHM->Bbusystate != 1 && COMMON_TIME - SHM->busystate_b[bid - 1] >= 10) {
    SHM->busystate_b[bid - 1] = COMMON_TIME;
    get_records(direct, SHM->dircache[bid - 1],
            sizeof(fileheader_t), n < 1 ? 1 : n, DIRCACHESIZE);
    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;
}