Function start_credentials_socket 

pub fn start_credentials_socket() -> Result<BackgroundProcess, Error>

Starts a socket for io.systemd.Credentials using systemd-socket-activate.

Sets the file mode of the socket to 666 so that all users on the system have access.

Errors

Returns an error if

• systemd-socket-activate is unable to start the required socket,
• one or more files in /run/systemd can not be listed,
• applying of permissions on /run/systemd/io.systemd.Credentials fails,
• or the socket has not been made available within 10000ms.