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+ Skip unwinding stack and just jump directly to userspace
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+ Remove sys_kill() as we should be using a two-stage process where a
thread is first orphaned by sys_detach(), and then the thread itself
calls sys_exit() after it has done all necessary cleanup in init.
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+ A bit easier to implement just ignoring the ipc_resp() arguments than
try to enforce that a notification is exited from by ipc_ghost(),
especially in cases where the root process has been killed.
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+ ipc_kick() does a forward and a tail at the same time
The idea with ipc_tail() is to allow 'trusted' calls, so for example a
process is not allowed to willy-nilly open a file, as it has to go via
init(), making the eid 1. This way the receiver can know that the
request has gone through init() and can open up a new connection
(file, whatever) after which requests from that pid/tid are allowed
without init() intervention
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+ Current setup will likely not last long, just a stopgap until I figure
out how I want to build each testcase etc.
Probably dir based, but I'll probably add some scripts that generate
the build rules for each test case (or binary?). Also, should probably
put ouput files in a build directory and keep the source clean, but
again, good enough for now.
Will have to start implementing more extensive tests, and probably
come up with some way to compare textual output etc.
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