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The idea is that, with the right flag settings, this will cause the OS to
terminate remaining viewer child processes when the viewer terminates --
whether or not it terminates intentionally. Of course, if LLProcess's caller
specifies autokill=false, e.g. to run the viewer updater, that asserts that we
WANT the child to persist beyond the viewer session itself.
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This allows callers to pass either LLSD formatted as before -- which all
callers still do -- or an actual LLProcess::Params block.
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LLProcessLauncher had the somewhat fuzzy mandate of (1) accumulating
parameters with which to launch a child process and (2) sometimes tracking the
lifespan of the ensuing child process. But a valid LLProcessLauncher object
might or might not have ever been associated with an actual child process.
LLProcess specifically tracks a child process. In effect, it's a fairly thin
wrapper around a process HANDLE (on Windows) or pid_t (elsewhere), with
lifespan management thrown in. A static LLProcess::create() method launches a
new child; create() accepts an LLSD bundle with child parameters. So building
up a parameter bundle is deferred to LLSD rather than conflated with the
process management object.
Reconcile all known LLProcessLauncher consumers in the viewer code base,
notably the class unit tests.
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