Linux?????????????????

???????????? ???????[ 2013/1/23 10:13:48 ] ????????

??????????????????

???????????????????????????????test.c??????????init.c??????????????????/tmp???е????test.log??????????????????????е?init_daemon???????????????????????????????init_daemon?????????????????????

????1??init.c?嵥

    #include < unistd.h >
    #include < signal.h >
    #include < sys/param.h >
    #include < sys/types.h >
    #include < sys/stat.h > void init_daemon(void)
    {
    int pid;
    int i;
    if(pid=fork())
    exit(0);//??????????????????
    else if(pid< 0)
    exit(1);//fork???????
    //????????????????????
    setsid();
    //???????????μ???鳤??????鳤
    //?????????????
    if(pid=fork())
    exit(0);
    //??????????????????????
    else if(pid< 0)
    exit(1);
    //fork???????
    //??????????????
    //???????????????鳤
    for(i=0;i< NOFILE;++i)//???????????????
    close(i);   chdir(“/tmp”);
    //??乤??????/tmp
    umask(0);
    //??????????????
    return;
    }

????2??test.c?嵥

    #include < stdio.h >
    #include < time.h >
    void init_daemon(void);//???????????????
    main()
    {
    FILE *fp;
    time_t t;
    init_daemon();//??????Daemon
    while(1)//??????????test.log??????????
     {
    sleep(60);//????????
    if((fp=fopen(“test.log”??”a”)) >=0)
       {
    t=time(0);
    fprintf(fp??”I’m here at %s ”??asctime(localtime(&t)) );
    fclose(fp);
        }
      }
    }