Bc

In src/rpc/blockchain.cpp:

•        "]\n"
  

•    );
  

• RPCTypeCheck(request.params, {UniValue::VSTR, UniValue::VOBJ});
• UniValue result(UniValue::VOBJ);
• if (request.params[0].get_str() == "status") {

•    CoinsViewScanReserver reserver;
  

•    if (reserver.reserve()) {
  

•        throw JSONRPCError(RPC_INVALID_PARAMETER, "No scan in progress");
  

•    }
  

•    result.pushKV("progress", g_scan_progress);
  

• } else if (request.params[0].get_str() == "abort") {

•    CoinsViewScanReserver reserver;
  

•    if (reserver.reserve()) {
  

•        return false;
  

Since this return value is subject to several races [1], I believe you could just return NullUniValue;

[1]:

e.g. the scan finishes between the last call and this one
e.g. this call returns true, but the last start call was not (yet) actually aborted