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The utilities in os/session_policy.h used to be tailored for the matching of session arguments against a server-side policy configuration. However, the policy-matching part is useful in other situations, too. This patch removes the tight coupling with the session-argument parsing (via Arg_string) and the hard-wired use of 'Genode::config()'. To make the utilities more versatile, the 'Session_label' has become a 'Genode::String' (at the time when we originally introduced the 'Session_label', there was no 'Genode::String'). The parsing of the session arguments happens in the constructor of this special 'String'. The constructor of 'Session_policy' now takes a 'Genode::String' as argument. So it can be used with the 'Session_label' but also with other 'String' types. Furthermore, the implicit use of 'Genode::config()' can be overridden by explicitly specifying the config node as an argument.
This is the example operating system based on the Genode OS framework: :_Init_: is the first real process in the system. The provided implementation uses a very simple XML parser to read its configuration files. :_Drivers_: The example OS has basic drivers for frame buffer, mouse and keyboard input, the PCI bus, the real-time clock, and system-specific timers. :_Server_: The only server in the example OS is Nitpicker, a minimal-complexity GUI server. :_Test_: are also part of the example OS. You may have a look at the fork bomb as a simple system stress test. :_Ldso_: is the dynamic linker used for loading executables that are linked against shared libraries. :_Lib_: contains libraries used by the components of the OS repository, for example, the alarm framework.