Add sp_get_signals() function.

[libserialport.git] / serialport.c

diff --git a/serialport.c b/serialport.c
index ab1baa76df2cadd5a8af15e5807c6e55c2a80e80..522cafa5e014eebb705bce00da23653a31232d44 100644 (file)
--- a/serialport.c
+++ b/serialport.c
@@ -1298,6 +1298,42 @@ enum sp_return sp_set_flowcontrol(struct sp_port *port, enum sp_flowcontrol flow
        return SP_OK;
 }
 
+enum sp_return sp_get_signals(struct sp_port *port, enum sp_signal *signals)
+{
+       CHECK_PORT();
+
+       if (!signals)
+               return SP_ERR_ARG;
+
+       *signals = 0;
+#ifdef _WIN32
+       DWORD bits;
+       if (GetCommModemStatus(port->hdl, &bits) == 0)
+               return SP_ERR_FAIL;
+       if (bits & MS_CTS_ON)
+               *signals |= SP_SIG_CTS;
+       if (bits & MS_DSR_ON)
+               *signals |= SP_SIG_DSR;
+       if (bits & MS_RING_ON)
+               *signals |= SP_SIG_DCD;
+       if (bits & MS_RLSD_ON)
+               *signals |= SP_SIG_RI;
+#else
+       int bits;
+       if (ioctl(port->fd, TIOCMGET, &bits) < 0)
+               return SP_ERR_FAIL;
+       if (bits & TIOCM_CTS)
+               *signals |= SP_SIG_CTS;
+       if (bits & TIOCM_DSR)
+               *signals |= SP_SIG_DSR;
+       if (bits & TIOCM_CAR)
+               *signals |= SP_SIG_DCD;
+       if (bits & TIOCM_RNG)
+               *signals |= SP_SIG_RI;
+#endif
+       return SP_OK;
+}
+
 enum sp_return sp_start_break(struct sp_port *port)
 {
        CHECK_PORT();