genode/os/src/server/fs_rom
Norman Feske fae63f4fa9 Merge base libraries into a single library
This patch simplifies the way of how Genode's base libraries are
organized. Originally, the base API was implemented in the form of many
small libraries such as 'thread', 'env', 'server', etc. Most of them
used to consist of only a small number of files. Because those libraries
are incorporated in any build, the checking of their inter-dependencies
made the build process more verbose than desired. Also, the number of
libraries and their roles (core only, non-core only, shared by both core
and non-core) were not easy to capture.

Hereby, the base libraries have been reduced to the following few
libraries:

- startup.mk contains the startup code for normal Genode processes.
  On some platform, core is able to use the library as well.
- base-common.mk contains the parts of the base library that are
  identical by core and non-core processes.
- base.mk contains the complete base API implementation for non-core
  processes

Consequently, the 'LIBS' declaration in 'target.mk' files becomes
simpler as well. In the most simple case, only the 'base' library must
be mentioned.

Fixes #18
2013-02-19 14:45:55 +01:00
..
README Add new 'fs_rom' service 2013-01-15 10:18:11 +01:00
main.cc Add new 'fs_rom' service 2013-01-15 10:18:11 +01:00
target.mk Merge base libraries into a single library 2013-02-19 14:45:55 +01:00

README

The 'fs_rom' server translates the 'File_system' session interface to the
'ROM' session' interface. Each request for a ROM file is handled by looking
up an equally named file on the file system. If no such file could be found,
the server watches the file system for the creation of the corresponding file.
Furthermore, the server reflects file changes as signals to the ROM session.

Limitations
-----------

* Symbolic links are not handled
* The server needs to allocate RAM for each requested file. The RAM is always
  allocated from the RAM session of the server. The RAM quota consumed by the
  server depends on the client requests and the size of the requested files.
  Therefore, one instance of the server should not be used by untrusted clients
  and critical clients at the same time. In such situations, multiple instances
  of the server could be used.