在 postmaster.c 中看到這種代碼，從Java程序員的角度，看起來是很不爽的:

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

到底何時 ListenAddress 的邏輯值為真呢？試作如下代碼進行驗證：

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

編譯后運行結果：ListenAddresses is NG.

再改改，運行看看：

char *ListenAddresses;int
main(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;
}

運行結果：

ListenAdresses is ok.
ListenAddresses is 192.168.2.5.

轉載于:https://www.cnblogs.com/gaojian/archive/2012/07/17/2595334.html

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