How to send a broadcast udp packet to 255.255.255.255 in qt?

Question

linux

Hello!
There is a network with a mask of 255.255.255.0, there is a Debian 6 machine running an application written in qt that sends a broadcast udp packet.
If the address is set as 192.168.5.255, then everything is fine, broadcast is sent, if the address is 255.255.255.255, then the send function returns -1.
In the program for working with udp I use QUdpSocket, qt 4.7.4 The
question is, is it possible to force the program to send a broadcast packet to 255.255.255.255 with a subnet mask of 255.255.255.0?
In Windows, it seems, with similar network settings, packets are sent to 255.255.255.255 ...