Using open() on an optical drive with its tray open will close the tray

[Removed by request]

I'm using Ubuntu 15.04 dev with udev 218-2ubuntu3 and if the tray of an optical drive is open and open() will then be used on the device file the tray will be closed. Here is an example code (compiled with "gcc -Wall -pedantic -o test test.c"):

#include <fcntl.h>

int main()
{
 open("/dev/sr0", O_EXCL);
 return 0;
}

Normally I would expect that the tray doesn't get closed so I'm assuming an udev rule causes this behavior.