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We've grown-out of pb_run_cmd a little, as we have a number of different
process types:
boot():
- kexec: short-running process, run synchronously
- boot hooks: short-running, run sync, need exit code & stdout
network init:
- interface configuration: short running, run sync
- udhcp processes are long running, we may want completion, but
doesn't block other actions
downloads:
- potentially long-running, block parse progress
config nvram:
- read: short running, can block, need stdout
- write: short running, can block
We'd like to introduce proper asynchronous processes, to allow config &
boot-option downloads without blocking the discover server.
This change introduces a new type for processes, 'struct process'. These
structures are created with process_create, and run with
process_run_sync or process_run_async. The latter reports completion
through a callback member of struct process.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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