I'm trying to create a dbus service using sdbus (sd-bus?), that will respond with an fd representing a socket.
My client is able to receive strings and ints, so I have the basics covered. What I am looking for is how to package the fd as an "h" type in the response message.
It seems that there is no magic required.
The server creates the socket and replies to the client in the most apparent way (pseudo code):
fd = socket(AF_UNIX, SOCK_STREAM, 0); sd_bus_reply_method_return(message, "h", fd); The client just had to dup() the incoming fd and is then able to access it:
int fd; int dup_fd; sd_bus_message_read(message, "h", &fd); dup_fd = dup(fd);