6f876815c6e8a06f07e27b7658e04d6d595d9584
These two sites _do_ match the definition of pid_is_valid(); they don't provide any special handling for the invalid PID value 0. (They're used by dbus methods, so the PID value 0 is handled with reference to the dbus client creds, outside of these functions).
systemd - System and Service Manager
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