//FB 用 shared mem来记录最大在线人数，也就是每次重启都是从零开始
//可以改写代码bbsd.c 来用一个文件记录历史最大人数，不过.......
//我喜欢作弊，所以....
//kring wrote it to change max_login_num @2001-5-21
#include "../include/bbs.h"
#include <sys/ipc.h>
#include <sys/shm.h>
struct UTMPFILE *utmpshm;
char genbuf[1024];
void
attach_err(shmkey, name, err)
int     shmkey;
char   *name;
int     err;
{
        sprintf(genbuf, "Error! %s error #%d! key = %x.\n", name, err,
shmkey)
;
        write(1, genbuf, strlen(genbuf));
        exit(1);
}
int
search_shmkey(char *keyname)
{
        int     i = 0, found = 0;
        while (shmkeys[i].key != NULL) {
                if (strcmp(shmkeys[i].key, keyname) == 0) {
                        found = shmkeys[i].value;
                        break;
                }
                i++;
        }
        if (found == 0) {
                sprintf(genbuf, "search_shmkey(): cannot found %s SHMKEY
entry
!", keyname);
        }
        return found;
}
void   *
attach_shm(shmstr, defaultkey, shmsize)
char   *shmstr;
int     defaultkey, shmsize;
{
        void   *shmptr;
        int     shmkey, shmid;
        shmkey = search_shmkey(shmstr);
        if (shmkey < 1024)
                shmkey = defaultkey;
        shmid = shmget(shmkey, shmsize, 0);
        if (shmid < 0) {
                shmid = shmget(shmkey, shmsize, IPC_CREAT | 0640);
                if (shmid < 0)
                        attach_err(shmkey, "shmget", errno);
                shmptr = (void *) shmat(shmid, NULL, 0);
                if (shmptr == (void *) -1)
                        attach_err(shmkey, "shmat", errno);
                memset(shmptr, 0, shmsize);
        } else {
                shmptr = (void *) shmat(shmid, NULL, 0);
                if (shmptr == (void *) -1)
                        attach_err(shmkey, "shmat", errno);
        }
        return shmptr;
}
void
resolve_utmp()
{
        if (utmpshm == NULL) {
                utmpshm = attach_shm("UTMP_SHMKEY", 3699,
sizeof(*utmpshm));
        }
}

main(int argc,char **argv)
{
if(argc==2){
        resolve_utmp();
        utmpshm->max_login_num=atoi(argv[1]);
        printf("Succesed!\n");
}
else printf("cheat <num>\n");
}
--
FROM 166.111.174.182