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We currently use more complex and functional protocol on linux,
and a simple ad-hoc protocol on other OSes.
This leads to code duplication in both ipc and executor.
Linux supports coverage, shared memory communication and fork server,
which would also be useful for most other OSes.
Unify communication protocol and parametrize it by
(1) use of shmem or only pipes, (2) use of fork server.
This reduces duplication in ipc and executor and will
allow to support the useful features for other OSes easily.
Finally, this fixes akaros support as it currently uses
syz-stress running on host (linux) and executor running on akaros.
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Currently we always send 2MB of data to executor in ipc_simple.go.
Send only what's consumed by the program, and don't send the trailing zeros.
Serialized programs usually take only few KBs.
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This claimed to be fixed:
https://fuchsia.atlassian.net/browse/DNO-158
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We currently return raw error, so sometimes it's hard to tell
even what call produced the error (e.g. just "invalid argument").
Extend the error so that it's clear that it comes from cmd.Start.
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For now we just make Go part build for freebsd.
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Abs does not work on fuchsia only, use it on windows.
Also maintain stats.
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