Method ThreadOpenConnections

src/net.cpp:1919–2187

}

void CConnman::ThreadOpenConnections(const std::vector<std::string> connect)
{
    SetSyscallSandboxPolicy(SyscallSandboxPolicy::NET_OPEN_CONNECTION);
    // Connect to specific addresses
    if (!connect.empty())
    {
        for (int64_t nLoop = 0;; nLoop++)
        {
            ProcessAddrFetch();
            for (const std::string& strAddr : connect)
            {
                CAddress addr(CService(), NODE_NONE);
                OpenNetworkConnection(addr, false, nullptr, strAddr.c_str(), ConnectionType::MANUAL);
                for (int i = 0; i < 10 && i < nLoop; i++)
                {
                    if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
                        return;
                }
            }
            if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
                return;
        }
    }

    // Initiate network connections
    auto start = GetTime<std::chrono::microseconds>();

    // Minimum time before next feeler connection (in microseconds).
    auto next_feeler = GetExponentialRand(start, FEELER_INTERVAL);
    auto next_extra_block_relay = GetExponentialRand(start, EXTRA_BLOCK_RELAY_ONLY_PEER_INTERVAL);
    const bool dnsseed = gArgs.GetBoolArg("-dnsseed", DEFAULT_DNSSEED);
    bool add_fixed_seeds = gArgs.GetBoolArg("-fixedseeds", DEFAULT_FIXEDSEEDS);

    if (!add_fixed_seeds) {
        LogPrintf("Fixed seeds are disabled\n");
    }

    while (!interruptNet)
    {
        ProcessAddrFetch();

        if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
            return;

        CSemaphoreGrant grant(*semOutbound);
        if (interruptNet)
            return;

        if (add_fixed_seeds && addrman.size() == 0) {
            // When the node starts with an empty peers.dat, there are a few other sources of peers before
            // we fallback on to fixed seeds: -dnsseed, -seednode, -addnode
            // If none of those are available, we fallback on to fixed seeds immediately, else we allow
            // 60 seconds for any of those sources to populate addrman.
            bool add_fixed_seeds_now = false;
            // It is cheapest to check if enough time has passed first.
            if (GetTime<std::chrono::seconds>() > start + std::chrono::minutes{1}) {
                add_fixed_seeds_now = true;
                LogPrintf("Adding fixed seeds as 60 seconds have passed and addrman is empty\n");