+ if (config->rts >= 0 || config->cts >= 0) {
+ if (data->termiox_supported) {
+ data->flow &= ~(RTS_FLOW | CTS_FLOW);
+ switch (config->rts) {
+ case SP_RTS_OFF:
+ case SP_RTS_ON:
+ controlbits = TIOCM_RTS;
+ if (ioctl(port->fd, config->rts == SP_RTS_ON ? TIOCMBIS : TIOCMBIC, &controlbits) < 0)
+ return SP_ERR_FAIL;
+ break;
+ case SP_RTS_FLOW_CONTROL:
+ data->flow |= RTS_FLOW;
+ break;
+ default:
+ break;
+ }
+ if (config->cts == SP_CTS_FLOW_CONTROL)
+ data->flow |= CTS_FLOW;
+
+ if (data->flow & (RTS_FLOW | CTS_FLOW))
+ data->term.c_iflag |= CRTSCTS;
+ else
+ data->term.c_iflag &= ~CRTSCTS;
+ } else {
+ /* Asymmetric use of RTS/CTS not supported. */
+ if (data->term.c_iflag & CRTSCTS) {
+ /* Flow control can only be disabled for both RTS & CTS together. */
+ if (config->rts >= 0 && config->rts != SP_RTS_FLOW_CONTROL) {
+ if (config->cts != SP_CTS_IGNORE)
+ return SP_ERR_SUPP;
+ }
+ if (config->cts >= 0 && config->cts != SP_CTS_FLOW_CONTROL) {
+ if (config->rts <= 0 || config->rts == SP_RTS_FLOW_CONTROL)
+ return SP_ERR_SUPP;
+ }
+ } else {
+ /* Flow control can only be enabled for both RTS & CTS together. */
+ if (((config->rts == SP_RTS_FLOW_CONTROL) && (config->cts != SP_CTS_FLOW_CONTROL)) ||
+ ((config->cts == SP_CTS_FLOW_CONTROL) && (config->rts != SP_RTS_FLOW_CONTROL)))
+ return SP_ERR_SUPP;
+ }
+
+ if (config->rts >= 0) {
+ if (config->rts == SP_RTS_FLOW_CONTROL) {
+ data->term.c_iflag |= CRTSCTS;
+ } else {
+ controlbits = TIOCM_RTS;
+ if (ioctl(port->fd, config->rts == SP_RTS_ON ? TIOCMBIS : TIOCMBIC,
+ &controlbits) < 0)
+ return SP_ERR_FAIL;
+ }
+ }
+ }
+ }
+
+ if (config->dtr >= 0 || config->dsr >= 0) {
+ if (data->termiox_supported) {
+ data->flow &= ~(DTR_FLOW | DSR_FLOW);
+ switch (config->dtr) {
+ case SP_DTR_OFF:
+ case SP_DTR_ON:
+ controlbits = TIOCM_DTR;
+ if (ioctl(port->fd, config->dtr == SP_DTR_ON ? TIOCMBIS : TIOCMBIC, &controlbits) < 0)
+ return SP_ERR_FAIL;
+ break;
+ case SP_DTR_FLOW_CONTROL:
+ data->flow |= DTR_FLOW;
+ break;
+ default:
+ break;
+ }
+ if (config->dsr == SP_DSR_FLOW_CONTROL)
+ data->flow |= DSR_FLOW;
+ } else {
+ /* DTR/DSR flow control not supported. */
+ if (config->dtr == SP_DTR_FLOW_CONTROL || config->dsr == SP_DSR_FLOW_CONTROL)
+ return SP_ERR_SUPP;
+
+ if (config->dtr >= 0) {
+ controlbits = TIOCM_DTR;
+ if (ioctl(port->fd, config->dtr == SP_DTR_ON ? TIOCMBIS : TIOCMBIC,
+ &controlbits) < 0)
+ return SP_ERR_FAIL;
+ }
+ }
+ }
+
+ if (config->xon_xoff >= 0) {
+ data->term.c_iflag &= ~(IXON | IXOFF | IXANY);
+ switch (config->xon_xoff) {
+ case SP_XONXOFF_DISABLED:
+ break;
+ case SP_XONXOFF_IN:
+ data->term.c_iflag |= IXOFF;
+ break;
+ case SP_XONXOFF_OUT:
+ data->term.c_iflag |= IXON | IXANY;
+ break;
+ case SP_XONXOFF_INOUT:
+ data->term.c_iflag |= IXON | IXOFF | IXANY;
+ break;
+ default:
+ return SP_ERR_ARG;
+ }
+ }
+
+ if (tcsetattr(port->fd, TCSADRAIN, &data->term) < 0)