Function ser_open

src/serial.c:926–979

* \brief Open serial port * \param p * \return fd */

 * \return fd
 */
int ser_open(hamlib_port_t *p)
{
    int ret;

    rig_debug(RIG_DEBUG_VERBOSE, "%s called port=%s\n", __func__, p->pathname);

    if (!strncmp(p->pathname, "uh-rig", 6))
    {
        /*
         * This should not happen: ser_open is only used for
         * DTR-only serial ports (ptt_pathname != rig_pathname).
         */
        ret = -1;
    }
    else
    {
        if (!strncmp(p->pathname, "uh-ptt", 6))
        {
            /*
             * Use microHam device for doing PTT. Although a valid file
             * descriptor is returned, it is not used for anything
             * but must be remembered in a global variable:
             * If it is tried later to set/unset DTR on this fd, we know
             * that we cannot use ioctl and must rather call our
             * PTT set/unset service routine.
             */
            ret = uh_open_ptt();
            uh_ptt_fd = ret;
        }
        else
        {
            /*
             * pathname is not uh_rig or uh_ptt: simply open()
             */
            int i = 1;

            do // some serial ports fail to open 1st time
            {
                ret = OPEN(p->pathname, O_RDWR | O_NOCTTY | O_NDELAY);

                if (ret == -1) // some serial ports fail to open 1st time
                {
                    rig_debug(RIG_DEBUG_WARN, "%s(%d): open failed#%d\n", __func__, __LINE__, i);
                    hl_usleep(500 * 1000);
                    ret = OPEN(p->pathname, O_RDWR | O_NOCTTY | O_NDELAY);
                }
            }
            while (++i <= 4 && ret == -1);
        }
    }

    p->fd = ret;
    return (ret);
}


/**