path: root/util/shmctl.c

/* $Id$ */
#include "bbs.h"
#include <sys/wait.h>
#include <string.h>

extern SHM_t   *SHM;

/* utmpfix ----------------------------------------------------------------- */
int logout_friend_online(userinfo_t *utmp)
{
    int i, j, k;
    int offset=(int) (utmp - &SHM->uinfo[0]);
    userinfo_t *ui;
    while(utmp->friendtotal){
    if( !(0 <= utmp->friendtotal && utmp->friendtotal < MAX_FRIEND) )
        return 1;
    i = utmp->friendtotal-1;
    j = (utmp->friend_online[i] & 0xFFFFFF);
    if( !(0 <= j && j < MAX_ACTIVE) )
        printf("\tonline friend error(%d)\n", j);
    else{
        utmp->friend_online[i]=0;
        ui = &SHM->uinfo[j]; 
        if(ui->pid && ui!=utmp){
        if(ui->friendtotal > MAX_FRIEND)
            printf("\tfriend(%d) has too many(%d) friends\n", j, ui->friendtotal);
        for(k=0; k<ui->friendtotal && k<MAX_FRIEND &&
            (int)(ui->friend_online[k] & 0xFFFFFF) !=offset; k++);
        if( k < ui->friendtotal && k < MAX_FRIEND ){
            ui->friendtotal--;
            ui->friend_online[k]=ui->friend_online[ui->friendtotal];
            ui->friend_online[ui->friendtotal]=0;
        }
        }
    }
    utmp->friendtotal--;
    utmp->friend_online[utmp->friendtotal]=0;
    }
    return 0;
}

void purge_utmp(userinfo_t *uentp)
{
    logout_friend_online(uentp);
    //memset(uentp, 0, sizeof(userinfo_t));
}

typedef struct {
    int     index;
    int     idle;
} IDLE_t;

int sfIDLE(const void *a, const void *b)
{
    return ((IDLE_t *)b)->idle - ((IDLE_t *)a)->idle;
}

int utmpfix(int argc, char **argv)
{
    int     i, fast = 0, nownum = SHM->UTMPnumber;
    int     which, nactive = 0, dofork = 1, daemonsleep = 0;
    time_t  now;
    char    *clean, buf[1024];
    IDLE_t  idle[USHM_SIZE];
    char    changeflag = 0;
    time_t  timeout = -1;
    int     lowerbound = 100, upperbound = 0;
    char    ch;

    int     killtop = 0;
    struct {
    pid_t   pid;
    int     where;
    } killlist[USHM_SIZE];
    #define addkilllist(a, b)            \
        do {                             \
        killlist[killtop].where = a; \
            killlist[killtop++].pid = b; \
        } while( 0 )

    while( (ch = getopt(argc, argv, "nt:l:FD:u:")) != -1 )
    switch( ch ){
    case 'n':
        fast = 1;
        break;
    case 't':
        timeout = atoi(optarg);
        break;
    case 'l':
        lowerbound = atoi(optarg);
        break;
    case 'F':
        dofork = 0;
        break;
    case 'D':
        daemonsleep = atoi(optarg);
        break;
    case 'u':
        upperbound = atoi(optarg);
        break;
    default:
        printf("usage:\tshmctl\tutmpfix [-n] [-t timeout] [-F] [-D sleep]\n");
        return 1;
    }

    if( daemonsleep )
    switch( fork() ){
    case -1:
        perror("fork()");
        return 0;
    case 0:
        break;
    default:
        return 0;
    }

    if( daemonsleep || dofork ){
    int     times = 1000, status;
    pid_t   pid;
    while( daemonsleep ? 1 : times-- )
        switch( pid = fork() ){
        case -1:
        sleep(1);
        break;
        case 0:
        setproctitle("utmpfix");
        goto DoUtmpfix;
        default:
        setproctitle(daemonsleep ? "utmpfixd(wait for %d)" :
                 "utmpfix(wait for %d)", (int)pid);
        waitpid(pid, &status, 0);
        if( WIFEXITED(status) && !daemonsleep )
            return 0;
        if( !WIFEXITED(status) ){
            /* last utmpfix fails, so SHM->UTMPbusystate is holded */
            SHM->UTMPbusystate = 0;
        }
        }
    return 0; // never reach
    }

 DoUtmpfix:
    for( i = 0 ; i < 5 ; ++i )
    if( !SHM->UTMPbusystate )
        break;
    else{
        puts("utmpshm is busy....");
        sleep(1);
    }
    SHM->UTMPbusystate = 1;

    printf("starting scaning... %s \n", (fast ? "(fast mode)" : ""));
    nownum = SHM->UTMPnumber;
#ifdef OUTTA_TIMER
    now = SHM->GV2.e.now;
#else
    time(&now);
#endif
    for( i = 0, nactive = 0 ; i < USHM_SIZE ; ++i )
    if( SHM->uinfo[i].pid ){
        idle[nactive].index = i;
        idle[nactive].idle = now - SHM->uinfo[i].lastact;
        ++nactive;
    }
    if( !fast )
    qsort(idle, nactive, sizeof(IDLE_t), sfIDLE);

    for( i = 0 ; i < nactive ; ++i ){
    which = idle[i].index;
    clean = NULL;
    if( !isalpha(SHM->uinfo[which].userid[0]) ){
        clean = "userid error";
        if( SHM->uinfo[which].pid > 0 )
        addkilllist(which, SHM->uinfo[which].pid);
    }
    else if( memchr(SHM->uinfo[which].userid, '\0', IDLEN + 1) == NULL ){
        clean = "userid without z";
        if( SHM->uinfo[which].pid > 0 )
        addkilllist(which, SHM->uinfo[which].pid);
    }
    else if( SHM->uinfo[which].friendtotal > MAX_FRIEND ){
        clean = "too many friend";
        if( SHM->uinfo[which].pid > 0 )
        addkilllist(which, SHM->uinfo[which].pid);
    }
    else if( kill(SHM->uinfo[which].pid, 0) < 0 ){
        clean = "process error";
        purge_utmp(&SHM->uinfo[which]);
    }
    else if( searchuser(SHM->uinfo[which].userid) == 0 ){
        clean = "user not exist";
        if( SHM->uinfo[which].pid > 0 )
        addkilllist(which, SHM->uinfo[which].pid);
    }
#ifdef DOTIMEOUT
    else if( !fast ){
        if( nownum > lowerbound &&
        idle[i].idle > 
        (timeout == -1 ? IDLE_TIMEOUT : timeout) ){
        sprintf(buf, "timeout(%s",
            ctime4(&SHM->uinfo[which].lastact));
                buf[strlen(buf) - 1] = 0;
                strcat(buf, ")");
        clean = buf;
        if( SHM->uinfo[which].pid > 0 )
            addkilllist(which, SHM->uinfo[which].pid);
        else
            purge_utmp(&SHM->uinfo[which]);
        printf("%s\n", buf);
        --nownum;
        continue;
        }
    }
#endif
    
    if( clean ){
        printf("clean %06d(%s), userid: %s\n",
           i, clean, SHM->uinfo[which].userid);
        memset(&SHM->uinfo[which], 0, sizeof(userinfo_t));
        --nownum;
        changeflag = 1;
    }
    }
    for( i = 0 ; i < killtop ; ++i ){
    printf("sending SIGHUP to %d\n", (int)killlist[i].pid);
    kill(killlist[i].pid, SIGHUP);
    }
    sleep(3);
    for( i = 0 ; i < killtop ; ++i )
    if( SHM->uinfo[killlist[i].where].pid == killlist[i].pid &&
        kill(killlist[i].pid, 0) == 0 ){ // still alive
        printf("sending SIGKILL to %d\n", (int)killlist[i].pid);
        kill(killlist[i].pid, SIGKILL);
        purge_utmp(&SHM->uinfo[killlist[i].where]);
    }
    SHM->UTMPbusystate = 0;
    if( changeflag )
    SHM->UTMPneedsort = 1;

    if( daemonsleep ){
    do{
        sleep(daemonsleep);
    } while( upperbound && SHM->UTMPnumber < upperbound );
    goto DoUtmpfix; /* XXX: goto */
    }
    return 0;
}
/* end of utmpfix ---------------------------------------------------------- */

/* utmpsortd --------------------------------------------------------------- */
static int
cmputmpuserid(const void * i, const void * j)
{
    return strcasecmp(SHM->uinfo[*(int*)i].userid, SHM->uinfo[*(int*)j].userid);
}

static int
cmputmpmode(const void * i, const void * j)
{
    return SHM->uinfo[*(int*)i].mode - SHM->uinfo[*(int*)j].mode;
}

static int
cmputmpidle(const void * i, const void * j)
{
    return SHM->uinfo[*(int*)i].lastact - SHM->uinfo[*(int*)j].lastact;
}

static int
cmputmpfrom(const void * i, const void * j)
{
    return strcmp(SHM->uinfo[*(int*)i].from, SHM->uinfo[*(int*)j].from);
}

static int
cmputmpfive(const void * i, const void * j)
{
    userinfo_t *a=&SHM->uinfo[*(int*)i],*b=&SHM->uinfo[*(int*)j];
    int played_a=(a->five_win+a->five_lose+a->five_tie)!=0;
    int played_b=(b->five_win+b->five_lose+b->five_tie)!=0;
    int             type;

    if ((type = played_b - played_a))
    return type;
    if (played_a == 0)
    return 0;
    if ((type = b->five_win - a->five_win))
    return type;
    if ((type = a->five_lose - b->five_lose))
    return type;
    return a->five_tie - b->five_tie;
}

static int
cmputmpchc(const void * i, const void * j)
{
    userinfo_t *a=&SHM->uinfo[*(int*)i],*b=&SHM->uinfo[*(int*)j];
    int total_a=a->chc_win+a->chc_lose+a->chc_tie;
    int total_b=b->chc_win+b->chc_lose+b->chc_tie;
    int played_a=(total_a!=0);
    int played_b=(total_b!=0);
    int             type;

    // NOTE: 目前 "別找我下棋" 不影響排序
    /* 1. "找我下棋" 排最前面 */
    if ((a->withme&WITHME_CHESS)!=(b->withme&WITHME_CHESS))
    return (a->withme&WITHME_CHESS)?-1:1;
#ifdef CHC_SORTBY_RATING
    /* 2. 下超過十盤棋用等級分排序 */
    if ((total_a>=10)!=(total_b>=10))
    return (total_a>=10)?-1:1;
    if (total_a>=10 && total_b>=10) {
    if (a->chess_elo_rating!=b->chess_elo_rating)
        return b->chess_elo_rating-a->chess_elo_rating;
    }
#endif
    /* 3. 有下過棋的在沒下過的前面 */
    if ((type = played_b - played_a))
    return type;
    if (played_a == 0)
    return 0;
    /* 4. 剩下(下不超過十盤或等級分相同, 或不用等級分排序)的人以勝負和排 */
    if ((type = b->chc_win - a->chc_win))
        return type;
    if ((type = a->chc_lose - b->chc_lose))
    return type;
    return a->chc_tie - b->chc_tie;
}

static int
cmputmppid(const void * i, const void * j)
{
    return SHM->uinfo[*(int*)i].pid - SHM->uinfo[*(int*)j].pid;
}

static int
cmputmpuid(const void * i, const void * j)
{
    return SHM->uinfo[*(int*)i].uid - SHM->uinfo[*(int*)j].uid;
}

inline void utmpsort(int sortall)
{
    userinfo_t     *uentp;
    int             count, i, ns;
    short           nusers[MAX_BOARD];


    SHM->UTMPbusystate = 1;
#ifdef OUTTA_TIMER
    SHM->UTMPuptime = SHM->GV2.e.now;
#else
    SHM->UTMPuptime = time(NULL);
#endif
    ns = (SHM->currsorted ? 0 : 1);

    for (uentp = &SHM->uinfo[0], count = i = 0;
     i < USHM_SIZE;
     ++i, uentp = &SHM->uinfo[i]) {
    if (uentp->pid) {
        if (uentp->sex < 0 || uentp->sex > 7)
        purge_utmp(uentp);
        else
        SHM->sorted[ns][0][count++] = i;
    }
    }
    SHM->UTMPnumber = count;
    qsort(SHM->sorted[ns][0], count, sizeof(int), cmputmpuserid);
    memcpy(SHM->sorted[ns][6],
       SHM->sorted[ns][0], sizeof(int) * count);
    memcpy(SHM->sorted[ns][7],
       SHM->sorted[ns][0], sizeof(int) * count);
    qsort(SHM->sorted[ns][6], count, sizeof(int), cmputmpuid);
    qsort(SHM->sorted[ns][7], count, sizeof(int), cmputmppid);
    if( sortall !=-1){
    memcpy(SHM->sorted[ns][1],
           SHM->sorted[ns][0], sizeof(int) * count);
    memcpy(SHM->sorted[ns][2],
           SHM->sorted[ns][0], sizeof(int) * count);
    memcpy(SHM->sorted[ns][3],
           SHM->sorted[ns][0], sizeof(int) * count);
    memcpy(SHM->sorted[ns][4],
           SHM->sorted[ns][0], sizeof(int) * count);
    memcpy(SHM->sorted[ns][5],
           SHM->sorted[ns][0], sizeof(int) * count);
    qsort(SHM->sorted[ns][1], count, sizeof(int), cmputmpmode);
    qsort(SHM->sorted[ns][2], count, sizeof(int), cmputmpidle);
    qsort(SHM->sorted[ns][3], count, sizeof(int), cmputmpfrom);
    qsort(SHM->sorted[ns][4], count, sizeof(int), cmputmpfive);
    qsort(SHM->sorted[ns][5], count, sizeof(int), cmputmpchc);
    memset(nusers, 0, sizeof(nusers));
    for (i = 0; i < count; ++i) {
        uentp = &SHM->uinfo[SHM->sorted[ns][0][i]];
        if (uentp && uentp->pid &&
        0 < uentp->brc_id && uentp->brc_id < MAX_BOARD)
        ++nusers[uentp->brc_id - 1];
    }
    {
#if HOTBOARDCACHE
        int     k, r, last = 0, top = 0;
        int     HBcache[HOTBOARDCACHE];
        for (i = 0; i < HOTBOARDCACHE; i++)  HBcache[i]=-1;
#endif
        for (i = 0; i < SHM->Bnumber; i++)
        if (SHM->bcache[i].brdname[0] != 0){
            SHM->bcache[i].nuser = nusers[i];
#if HOTBOARDCACHE
            if( nusers[i] > 8                             &&
            (top < HOTBOARDCACHE || nusers[i] > last) &&
            IS_BOARD(&SHM->bcache[i])                 &&
            IS_OPENBRD(&SHM->bcache[i]) ){
            for( k = top - 1 ; k >= 0 ; --k )
                if(HBcache[k]>=0 &&
                                nusers[i] < SHM->bcache[HBcache[k]].nuser )
                break;
            if( top < HOTBOARDCACHE )
                ++top;
            for( r = top - 1 ; r > (k + 1) ; --r )
                HBcache[r] = HBcache[r - 1];
            HBcache[k + 1] = i;
            last = nusers[HBcache[top - 1]];
            }
#endif
        }
#if HOTBOARDCACHE
        memcpy(SHM->HBcache, HBcache, sizeof(HBcache));
        SHM->nHOTs = top;
#endif
    }
    }

    SHM->currsorted = ns;
    SHM->UTMPbusystate = 0;
}

int utmpsortd(int argc, char **argv)
{
    pid_t   pid;
    int     interval; // sleep interval in microsecond(1/10**6)
    int     sortall, counter = 0;

    if( fork() > 0 ){
    puts("sortutmpd daemonized...");
    return 0;
    }

    setproctitle("shmctl utmpsortd");
    if( argc < 2 || (interval = atoi(argv[1])) < 500000 )
    interval = 1000000; // default to 1 sec
    sortall = ((argc < 3) ? 1 : atoi(argv[2]));

    while( 1 ){
    if( (pid = fork()) != 0 ){
        int     s;
        waitpid(pid, &s, 0);
    }
    else{
        while( 1 ){
        int     i;
        for( i = 0 ; SHM->UTMPbusystate && i < 5 ; ++i )
            usleep(300000);

        if( SHM->UTMPneedsort ){
            if( ++counter == sortall ){
            utmpsort(1);
            counter = 0;
            }
            else
            utmpsort(0);
        }

        usleep(interval);
        }
    }
    }
}
/* end of utmpsortd -------------------------------------------------------- */

char *CTIMEx(char *buf, time4_t t)
{
    strcpy(buf, ctime4(&t));
    buf[strlen(buf) - 1] = 0;
    return buf;
}
int utmpstatus(int argc, char **argv)
{
    time_t  now;
    char    upbuf[64], nowbuf[64];
#ifdef OUTTA_TIMER
    now = SHM->GV2.e.now;
#else
    now = time(NULL);
#endif
    CTIMEx(upbuf,  SHM->UTMPuptime);
    CTIMEx(nowbuf, now);
    printf("now:        %s\n", nowbuf);
    printf("currsorted: %d\n", SHM->currsorted);
    printf("uptime:     %s\n", upbuf);
    printf("number:     %d\n", SHM->UTMPnumber);
    printf("busystate:  %d\n", SHM->UTMPbusystate);
    return 0;
}

int utmpreset(int argc, char **argv)
{
    SHM->UTMPbusystate=0;
    utmpstatus(0, NULL);
    return 0;
}

#define TIMES   10
int utmpwatch(int argc, char **argv)
{
    int     i;
    while( 1 ){
    for( i = 0 ; i < TIMES ; ++i ){
        usleep(300);
        if( !SHM->UTMPbusystate )
        break;
        puts("busying...");
    }
    if( i == TIMES ){
        puts("reset!");
        SHM->UTMPbusystate = 0;
    }
    }
    return 0;
}

int utmpnum(int argc, char **argv)
{
    printf("%d.0\n", SHM->UTMPnumber);
    return 0;
}

char    *GV2str[] = {"dymaxactive", "toomanyusers",
             "noonlineuser", NULL};
int showglobal(int argc, char **argv)
{
    int     i;
    for( i = 0 ; i < 10 ; ++i )
    printf("GLOBALVAR[%d] = %d\n", i, SHM->GLOBALVAR[i]);
    for( i = 0 ; GV2str[i] != NULL ; ++i )
    printf("GV2.%s = %d\n", GV2str[i], SHM->GV2.v[i]);
    return 0;
}

int setglobal(int argc, char **argv)
{
    int     where, value;
    if( argc != 3 ){
    puts("usage: shmctl setglobal ([0-9]|GV2) newvalue");
    return 1;
    }
    where = argv[1][0] - '0';
    value = atoi(argv[2]);

    if( 0 <= where && where <= 9 ){
    printf("GLOBALVAR[%d] = %d -> ", where, SHM->GLOBALVAR[where]);
    printf("%d\n", SHM->GLOBALVAR[where] = value);
    return 0;
    }
    else{
    for( where = 0 ; GV2str[where] != NULL ; ++where )
        if( strcmp(GV2str[where], argv[1]) == 0 ){
        printf("GV2.%s = %d -> ", GV2str[where], SHM->GV2.v[where]);
        printf("%d\n", SHM->GV2.v[where] = value);
        return 0;
        }
    }
    printf("GLOBALVAR %s not found\n", argv[1]);

    return 1;
}

int listpid(int argc, char **argv)
{
    int     i;
    for( i = 0 ; i < USHM_SIZE ; ++i )
    if( SHM->uinfo[i].pid > 0 )
        printf("%d\n", SHM->uinfo[i].pid);
    return 0;
}

int listbrd(int argc, char **argv)
{
    int     i, ch;
    int     noHidden = 0;

    while( (ch = getopt(argc, argv, "hn")) != -1 )
    switch( ch ){
    case 'n':
        noHidden = 1;
        break;
    case 'h':
    default:
        printf("usage:\tshmctl\tlistbrd [-n]\n"
           "\t-n no hidden board\n");
        return 0;
    }

    for( i = 0 ; i < MAX_BOARD ; ++i )
    if( bcache[i].brdname[0] && !(bcache[i].brdattr & BRD_GROUPBOARD) &&
        (!noHidden ||
         !((bcache[i].brdattr & BRD_HIDE) ||
           (bcache[i].level && !(bcache[i].brdattr & BRD_POSTMASK) &&
        (bcache[i].level & 
         ~(PERM_BASIC|PERM_CHAT|PERM_PAGE|PERM_POST|PERM_LOGINOK))))) )
        printf("%s\n", bcache[i].brdname);
    return 0;
}

#ifdef OUTTA_TIMER
int timed(int argc, char **argv)
{
    pid_t   pid;
    if( (pid = fork()) < 0 )
    perror("fork()");
    if( pid != 0 )
    return 0;
    setproctitle("shmctl timed");
    while( 1 ){
    SHM->GV2.e.now = time(NULL);
    sleep(1);
    }
}
#endif

#if 0
void buildclass(int bid, int level)
{
    boardheader_t  *bptr;
    if( level == 20 ){ /* for safty */
    printf("is there something wrong? class level: %d\n", level);
    return;
    }
    bptr = &bcache[bid];
    if (bptr->firstchild[0] == NULL || bptr->childcount <= 0)
        load_uidofgid(bid + 1, 1); /* 因為這邊 bid從 0開始, 所以再 +1 回來 */
    if (bptr->firstchild[1] == NULL || bptr->childcount <= 0)
        load_uidofgid(bid + 1, 1); /* 因為這邊 bid從 0開始, 所以再 +1 回來 */

    for (bptr = bptr->firstchild[0]; bptr != NULL ; bptr = bptr->next[0]) {
    if( bptr->brdattr & BRD_GROUPBOARD )
            buildclass(bptr - bcache, level + 1);
    }
}
#endif

int bBMC(int argc, char **argv)
{
    int     i;
    for( i = 0 ; i < MAX_BOARD ; ++i )
    if( bcache[i].brdname[0] )
        buildBMcache(i + 1); /* XXXbid */
    return 0;
}

#ifdef NOKILLWATERBALL
int nkwbd(int argc, char **argv)
{
    int     ch, sleeptime = 5, timeout = 5;
    while( (ch = getopt(argc, argv, "s:t:h")) != -1 )
    switch( ch ){
    case 's':
        if( (sleeptime = atoi(optarg)) <= 0 ){
        fprintf(stderr, "sleeptime <= 0? set to 5");
        sleeptime = 5;
        }
        break;

    case 't':
        if( (timeout = atoi(optarg)) <= 0 ){
        fprintf(stderr, "timeout <= 0? set to 5");
        timeout = 20;
        }
        break;

    default:
        fprintf(stderr, "usage: shmctl nkwbd [-s sleeptime] [-t timeout]\n");
        return 0;
    }

    setproctitle("shmctl nkwbd(sleep%d,timeout%d)", sleeptime, timeout);

    switch( fork() ){
    case -1:
    perror("fork()");
    return 0;
    break;

    case 0:  /* child */
    while( 1 ){
        int     i;
        time_t  t = SHM->GV2.e.now - timeout;

        for( i = 0 ; i < MAX_ACTIVE ; ++i )
        if( SHM->uinfo[i].pid        &&
            SHM->uinfo[i].wbtime     &&
            SHM->uinfo[i].wbtime < t    ){
            kill(SHM->uinfo[i].pid, SIGUSR2);
        }
        sleep(sleeptime);
    }
    break;

    default: /* parent */
    fprintf(stderr, "nkwbd\n");
    return 0;
    }
    return 0;
}
#endif

int SHMinit(int argc, char **argv)
{
    int     ch;
    int     no_uhash_loader = 0;
    while( (ch = getopt(argc, argv, "n")) != -1 )
    switch( ch ){
    case 'n':
        no_uhash_loader = 1;
        break;
    default:
        printf("usage:\tshmctl\tSHMinit\n");
        return 0;
    }

    puts("loading uhash...");
    system("bin/uhash_loader");

    attach_SHM();

    puts("loading bcache...");
    reload_bcache();

    puts("building BMcache...");
    bBMC(1, NULL);

#if 0
    puts("building class...");
    buildclass(0, 0);
#endif

    if( !no_uhash_loader ){
    puts("utmpsortd...");
    utmpsortd(1, NULL);
    }

#ifdef OUTTA_TIMER
    puts("timed...");
    timed(1, NULL);
#endif

#ifdef NOKILLWATERBALL
    puts("nkwbd...");
    nkwbd(1, NULL);
#endif

    return 0;
}

int hotboard(int argc, char **argv)
{
#define isvisiableboard(bptr)                                              \
        ((bptr)->brdname[0] &&                                             \
         !((bptr)->brdattr & BRD_GROUPBOARD) &&                            \
     !(((bptr)->brdattr & (BRD_HIDE | BRD_TOP)) ||                     \
       ((bptr)->level && !((bptr)->brdattr & BRD_POSTMASK) &&          \
        ((bptr)->level &                                               \
         ~(PERM_BASIC|PERM_CHAT|PERM_PAGE|PERM_POST|PERM_LOGINOK)))))

    int     ch, topn = 20, i, nbrds, j, k, nusers;
    struct bs {
    int     nusers;
    boardheader_t *b;
    } *brd;

    while( (ch = getopt(argc, argv, "t:h")) != -1 )
    switch( ch ){
    case 't':
        topn = atoi(optarg);
        if( topn <= 0 ){
        goto hotboardusage;
        return 1;
        }
        break;
    case 'h':
    default:
    hotboardusage:
        fprintf(stderr, "usage: shmctl hotboard [-t topn]\n");
        return 1;
    }

    brd = (struct bs *)malloc(sizeof(struct bs) * topn);
    brd[0].b = &SHM->bcache[0];
    brd[0].nusers = brd[0].b->brdname[0] ? brd[0].b->nuser : 0;
    nbrds = 1;

    for( i = 1 ; i < MAX_BOARD ; ++i )
    if( (isvisiableboard(&SHM->bcache[i])) &&
        (nbrds != topn ||
         SHM->bcache[i].nuser > brd[nbrds - 1].nusers) ){

        nusers = SHM->bcache[i].nuser; // no race ?
        for( k = nbrds - 2 ; k >= 0 ; --k )
        if( brd[k].nusers > nusers )
            break;

        if( (k + 1) < nbrds && (k + 2) < topn )
        for( j = nbrds - 1 ; j >= k + 1 ; --j )
            brd[j] = brd[j - 1];
        brd[k + 1].nusers = nusers;
        brd[k + 1].b = &SHM->bcache[i];

        if( nbrds < topn )
        ++nbrds;
    }

    for( i = 0 ; i < nbrds ; ++i )
    printf("%05d|%-12s|%s\n",
           brd[i].nusers, brd[i].b->brdname, brd[i].b->title);
    return 0;
}

int usermode(int argc, char **argv)
{
    int     i, modes[MAX_MODES];
    memset(modes, 0, sizeof(modes));
    for( i = 0 ; i < MAX_ACTIVE ; ++i )
    if( SHM->uinfo[i].userid[0] )
        ++modes[ (int)SHM->uinfo[i].mode ];

    for( i = 0 ; i < MAX_MODES ; ++i )
    printf("%03d|%05d|%s\n", i, modes[i], ModeTypeTable[i]);
    return 0;
}

int torb(int argc, char **argv)
{
    reload_bcache();
    puts("bcache reloaded");
    return 0;
}

int rlfcache(int argc, char **argv)
{
    reload_fcache();
    puts("fcache reloaded");
    return 0;
}

struct {
    int     (*func)(int, char **);
    char    *cmd, *descript;
} cmd[] =
    { {utmpfix,    "utmpfix",    "clear dead userlist entry"},
      {utmpsortd,  "utmpsortd",  "utmp sorting daemon"},
      {utmpstatus, "utmpstatus", "list utmpstatus"},
      {utmpreset,  "utmpreset",  "SHM->busystate=0"},
      {utmpwatch,  "utmpwatch",  "to see if busystate is always 1 then fix it"},
      {utmpnum,    "utmpnum",    "print SHM->number for snmpd"},
      {showglobal, "showglobal", "show GLOBALVAR[]"},
      {setglobal,  "setglobal",  "set GLOBALVAR[]"},
      {listpid,    "listpid",    "list all pids of mbbsd"},
      {listbrd,    "listbrd",    "list board info in SHM"},
#ifdef OUTTA_TIMER
      {timed,      "timed",      "time daemon for OUTTA_TIMER"},
#endif
#ifdef NOKILLWATERBALL
      {nkwbd,      "nkwbd",      "NOKillWaterBall daemon"},
#endif
      {bBMC,       "bBMC",       "build BM cache"},
      {SHMinit,    "SHMinit",    "initialize SHM (including uhash_loader)"},
      {hotboard,   "hotboard",   "list boards of most bfriends"},
      {usermode,   "usermode",   "list #users in the same mode"},
      {torb,       "reloadbcache", "reload bcache"},
      {rlfcache,   "reloadfcache", "reload fcache"},
      {NULL, NULL, NULL} };

extern char ** environ;

int main(int argc, char **argv)
{
    int     i = 0;
    
    chdir(BBSHOME);
    initsetproctitle(argc, argv, environ);
    if( argc >= 2 ){
    if( strcmp(argv[1], "init") == 0 ){
        /* in this case, do NOT run attach_SHM here.
           because uhash_loader is not run yet.      */
        return SHMinit(argc - 1, &argv[1]);
    }

    attach_SHM();
    /* shmctl doesn't need resolve_boards() first */
    //resolve_boards();
    resolve_garbage();
    resolve_fcache();
    for( i = 0 ; cmd[i].func != NULL ; ++i )
        if( strcmp(cmd[i].cmd, argv[1]) == 0 ){
        return cmd[i].func(argc - 1, &argv[1]);
        }
    }
    if( argc == 1 || cmd[i].func == NULL ){
    /* usage */
    printf("usage: shmctl [command] [options]\n");
    printf("commands:\n");
    for( i = 0 ; cmd[i].func != NULL ; ++i )
        printf("\t%-15s%s\n", cmd[i].cmd, cmd[i].descript);
    }
    return 0;
}