Android SystemProperties Part II－Mr. Cooooooooooooode

Refer to http://blog.csdn.net/netpirate/archive/2009/11/11/4799272.aspx

前面有一篇提到有關Android Property的文章

最近又碰到一些問題關於System Property的permission！

原來要在自己的application去對systemproperties做設定

我們不能亂取system property的屬性姓名

假設你要亂取，你必須在 system/core/init/property_service.c 做property permission的註冊

1       #define PERSISTENT_PROPERTY_DIR  "/data/property"
2       struct {
3           const char * prefix;
4          unsigned int uid;
5      } property_perms[] = {
6          { " net.rmnet0. " ,    AID_RADIO },
7          { " net.gprs. " ,      AID_RADIO },
8          { " ril. " ,           AID_RADIO },
9          { " gsm. " ,           AID_RADIO },
10          { " net.dns " ,        AID_RADIO },
11          { " net.usb0 " ,       AID_RADIO },
12          { " net. " ,           AID_SYSTEM },
13          { " dev. " ,           AID_SYSTEM },
14          { " runtime. " ,       AID_SYSTEM },
15          { " hw. " ,            AID_SYSTEM },
16          { " sys. " ,        AID_SYSTEM },
17          { " service. " ,    AID_SYSTEM },
18          { " wlan. " ,        AID_SYSTEM },
19          { " dhcp. " ,        AID_SYSTEM },
20          { " dhcp. " ,        AID_DHCP },
21          { " debug. " ,        AID_SHELL },
22          { " log. " ,        AID_SHELL },
23          { " service.adb.root " ,    AID_SHELL },
24          { " persist.sys. " ,    AID_SYSTEM },
25          { " persist.service. " ,   AID_SYSTEM },
26          { NULL, 0 }
27      };