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This patch alleviates the need for any non-core process to create Unix domain sockets locally. All sockets used for RPC communication are created by core and subsequently passed to the other processes via RPC or the parent interface. The immediate benefit is that no process other than core needs to access the 'rpath' directory in order to communicate. However, access to 'rpath' is still needed for accessing dataspaces. Core creates one socket pair per thread on demand on the first call of the 'Linux_cpu_session::server_sd()' or 'Linux_cpu_session::client_sd()' functions. 'Linux_cpu_session' is a Linux-specific extension to the CPU session interface. In addition to the socket accessors, the extension provides a mechanism to register the PID/TID of a thread. Those information were formerly propagated into core along with the thread name as argument to 'create_thread()'. Because core creates socket pairs for entrypoints, it needs to know all threads that are potential entrypoints. For lx_hybrid programs, we hadn't had propagated any thread information into core, yet. Hence, this patch also contains the code for registering threads of hybrid applications at core.
This is generic part of the Genode implementation. It consists of two parts: :_Core_: is the ultimate root of the Genode application tree and provides abstractions for the lowest-level hardware resources such as RAM, ROM, CPU, and generic device access. All generic parts of Core can be found here - for system-specific implementations refer to the appropriate 'base-<system>' directory. :_Base libraries and protocols_: that are used by each Genode component to interact with other components. This is the glue that holds everything together.