fdopen不工作

Question

问题是打开和fdopen工作，代码：

    LOGI("opened %s", strerror( errno ));
    int handle= open("/mnt/sdcard/license.rar",O_RDONLY);
    LOGI("opened %s", strerror( errno ));
    FILE* hNewFile= fdopen(handle,"r");
    LOGI("opened handle %d hNewFile %d %s",handle, hNewFile, strerror( errno ));

对应的日志文件：

03-09 14:12:40.151: opened No such file or directory
03-09 14:12:40.160: opened No such file or directory
03-09 14:12:40.160: opened handle 3 hNewFile 0 Invalid argument

我确实拥有正确的清单权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

有什么想法吗？