e0e7bc8223
A pid can be recycled, but a pidfd is pinned. Add a new method that is safer as it takes a pidfd as input. Return not only the D-Bus object path, but also the unit id and the last recorded invocation id, as they are both useful (especially the id, as converting from a path object to a unit id from a script requires another round-trip via D-Bus). Note that the manager still tracks processes by pid, so theorethically this is not fully error-proof, but on the other hand the method response is synchronous and the manager is single-threaded, so once a call is being processed the unit database will not change anyway. Once the manager switches to use pidfds everywhere, this can be further hardened.
System and Service Manager
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