Function start_thread

src/microham.c:899–1069

* If we do not have pthreads, we cannot use the microham device. * This is so because we have to digest unsolicited messages * (e.g. voltage change) and since we have to send periodic * heartbeats. * Nevertheless, the program should compile well even we we do not * have pthreads, in this case start_thread is a dummy since uh_is_initialized * is never set. * * If we do not have socketpair()

 * do not spawn it.
 */
static void start_thread()
{
#if defined(HAVE_SOCKETPAIR) && defined(HAVE_SELECT)
    /*
     * Find a microHam device and open serial port to it.
     * If successful, create sockets for doing I/O from within hamlib
     * and start a thread to listen to the "other ends" of the sockets
     */
    int ret, fail;
    unsigned char buf[4];
    pthread_attr_t attr;

    if (uh_is_initialized)
    {
        return;  // PARANOIA: this should not happen
    }

    finddevices();

    if (uh_device_fd  < 0)
    {
        MYERROR("Could not open any microHam device.\n");
        return;
    }

    // Create socket pairs
    if (socketpair(AF_UNIX, SOCK_STREAM, 0, uh_radio_pair)  < 0)
    {
        perror("RadioPair:");
        return;
    }

    if (socketpair(AF_UNIX, SOCK_STREAM, 0, uh_ptt_pair)    < 0)
    {
        perror("PTTPair:");
        return;
    }

    if (socketpair(AF_UNIX, SOCK_STREAM, 0, uh_wkey_pair) < 0)
    {
        perror("WkeyPair:");
        return;
    }

    DEBUG("RADIO  sockets: server=%d  client=%d\n", uh_radio_pair[0],
          uh_radio_pair[1]);
    DEBUG("PTT    sockets: server=%d  client=%d\n", uh_ptt_pair[0], uh_ptt_pair[1]);
    DEBUG("WinKey sockets: server=%d  client=%d\n", uh_wkey_pair[0],
          uh_wkey_pair[1]);

    //
    // Make the sockets nonblocking
    // First try if we can set flags, then do set the flags
    //

    fail = 0;

    ret = fcntl(uh_radio_pair[0], F_GETFL, 0);