在 postmaster.c 中看到这种代码，从Java程序员的角度，看起来是很不爽的:

char *ListenAddresses;...    if (ListenAddresses)    {                    char       *rawstring;                    List       *elemlist;                    ListCell   *l;                ...

到底何时 ListenAddress 的逻辑值为真呢？试作如下代码进行验证：

char *ListenAddresses;intmain(int argc, char **argv){       if (ListenAddresses){             fprintf(stderr, "ListenAddresses is ok.\n");        }else{             fprintf(stderr, "ListenAddresses is NG.\n");        }    return 0;}

编译后运行结果：ListenAddresses is NG.

再改改，运行看看：

char *ListenAddresses;intmain(int argc, char **argv){               ListenAddress="192.168.2.5";        if (ListenAddress){             fprintf(stderr, "ListenAddresses is ok.\n");             fprintf(stderr, "ListenAddresses is %s.\n",ListenAddress);        }else{             fprintf(stderr, "ListenAddresses is NG.\n");        }    return 0;}

运行结果：

ListenAdresses is ok.

ListenAddresses is 192.168.2.5.