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50 lines
3.0 KiB
Plaintext
50 lines
3.0 KiB
Plaintext
r_io/r_core-file fixing
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=======================
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Conceptual things:
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------------------
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-in general only code from r_io should be used for io related stuff, io is NOT a core-task
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-wrappers are ok, but no re-implementations (there might be exceptions but those must be reasonable argued)
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-linkage is not argument -> use RIOBind
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-esil-custom reads and writes should use RIOBind too
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-if a file gets opened a RIODesc MUST be created
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-if a file gets opened in usual cases a RIOMap MUST be created
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-if a file gets opened in unsusual cases it's not necessary to create a RIOMap
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-if no RIOMap was created for a fd reading and writing from and to this fd is only possible via r_io_pread and r_io_pwrite
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-this is only an option if only 1 file can be opened for a task or if the fd will never see the user-land
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-Rahash2 for example won't need creating a RIOMap
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-if a file gets closed all RIOMaps for that belong to the fd MUST get destroyed
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-if a file gets closed the RIODesc MUST get destroyed
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-the cores primary task is to delegate the different parts of r2
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-creating a new RIOMap or RIODesc on file-opening is NOT a core-task
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-the same goes for destroying RIOMaps and RIODesc on closing a file
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-there is no need for a map-list in the core directly. core->io->maps is the only list to store maps (for the long run, functions that return a list with maps are ok)
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Documentation:
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--------------
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There is no need for a huge documentation!!! But code with fundamental importance often needs a few lines on what it should do, its concept
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and sometimes a few lines of the code itself need some kind of 'justification' or explanation. libr/io/vio.c is a hardcore example for this
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RIO-code has fundamental importance, because everything will fail if io does not work correctly.
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This is needed to make bug-fixing easier, faster and better.
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Need review:
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------------
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libr/io/io.c
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libr/core/file.c
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Tasks:
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------
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-we should fix all the tests before doing this.
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-talk about ioneg
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-remove re-implemtations of r_io (middle)
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-implement r_io_open_at (easy) ; this should open a file, add a RIODesc and a RIOMap that maps the file to an offset that is passed as an arg
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-make r_io_open creating a new map (easy) ; this should open a file, add a RIODesc and a RIOMap that maps the file to 0
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-this means cleaning up r_core_file_open too (hard?)
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-implement r_io_open_no_map (easy) ; this should open a file and add a RIODesc. the file can only be accessed via r_io_pread and r_io_pwrite
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-make r_io_close destroy all maps that belong to the file that should be closed (easy)
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-this means cleaning up r_core_file_close too (hard?)
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-implement r_io_mwrite (hard); this should find all maps in a certain range, resolve their fds, RIODescs and paddr and then call pwrite
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-implement r_io_vwrite (hard); this should find all sections in a certain range, resolve the maddr that belongs to a vaddr and call mwrite, unsectioned area should be passed directly to mwrite
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-implement r_io_reopen (easy); keep the maps for a fd and reopen it, possibly with different permissions
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-this means cleaning up r_core_file_reopen too (hard?)
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