Function InterruptibleRecv

src/netbase.cpp:247–284

* Read bytes from socket. This will either read the full number of bytes requested * or return False on error or timeout. * This function can be interrupted by calling InterruptSocks5() * * @param data Buffer to receive into * @param len Length of data to receive * @param timeout Timeout in milliseconds for receive operation * * @note This function requires that hSocket is in non-blockin

 * @note This function requires that hSocket is in non-blocking mode.
 */
static IntrRecvError InterruptibleRecv(uint8_t* data, size_t len, int timeout, const SOCKET& hSocket)
{
    int64_t curTime = GetTimeMillis();
    int64_t endTime = curTime + timeout;
    // Maximum time to wait in one select call. It will take up until this time (in millis)
    // to break off in case of an interruption.
    const int64_t maxWait = 1000;
    while (len > 0 && curTime < endTime) {
        ssize_t ret = recv(hSocket, (char*)data, len, 0); // Optimistically try the recv first
        if (ret > 0) {
            len -= ret;
            data += ret;
        } else if (ret == 0) { // Unexpected disconnection
            return IntrRecvError::Disconnected;
        } else { // Other error or blocking
            int nErr = WSAGetLastError();
            if (nErr == WSAEINPROGRESS || nErr == WSAEWOULDBLOCK || nErr == WSAEINVAL) {
                if (!IsSelectableSocket(hSocket)) {
                    return IntrRecvError::NetworkError;
                }
                struct timeval tval = MillisToTimeval(std::min(endTime - curTime, maxWait));
                fd_set fdset;
                FD_ZERO(&fdset);
                FD_SET(hSocket, &fdset);
                int nRet = select(hSocket + 1, &fdset, nullptr, nullptr, &tval);
                if (nRet == SOCKET_ERROR) {
                    return IntrRecvError::NetworkError;
                }
            } else {
                return IntrRecvError::NetworkError;
            }
        }
        if (interruptSocks5Recv)
            return IntrRecvError::Interrupted;
        curTime = GetTimeMillis();
    }
    return len == 0 ? IntrRecvError::OK : IntrRecvError::Timeout;
}

/** Credentials for proxy authentication */
struct ProxyCredentials