title: SDCARD files permissions on Android using NDK
body: <p>I'm trying to open file on proprietry SDCARD usign standard method:
  hFile= open(filePath, O_RDWR|O_NONBLOCK|O_DIRECT);</p>
  
  <p>Sdcard is our proprietry card which was created using external tool, and when card is inserted ingo Android phone, the permission of file is:
  ----rwxr-x system   sdcard_rw    65536 2011-11-06 12:13 IMSP
  I guess Android decides on this permission.
  Anyway, file can't be open for writing
  Is any way to change the android application userid or groupid?</p>
  
  <p>Regard, Costa.</p>