fhandler_serial.cc: MARK and SPACE parity for serial port

[Marek Smetana]

I'm Sorry, this is my first patch using the mailing list.

Best regards

Marek

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From be77a27bd40da56064f12a72c18d434ddb6403dc Mon Sep 17 00:00:00 2001
From: Marek Smetana <mara.smetana@gmail.com>
Date: Mon, 1 Feb 2021 22:02:14 +0100
Subject: [PATCH] fhandler_serial.cc: MARK and SPACE parity for serial port

---
 winsup/cygwin/fhandler_serial.cc    | 11 ++++++++++-
 winsup/cygwin/include/sys/termios.h |  1 +
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/winsup/cygwin/fhandler_serial.cc b/winsup/cygwin/fhandler_serial.cc
index fd5b45899..e0257302c 100644
--- a/winsup/cygwin/fhandler_serial.cc
+++ b/winsup/cygwin/fhandler_serial.cc
@@ -727,7 +727,12 @@ fhandler_serial::tcsetattr (int action, const struct termios *t)
   /* -------------- Set parity ------------------ */
 
   if (t->c_cflag & PARENB)
-    state.Parity = (t->c_cflag & PARODD) ? ODDPARITY : EVENPARITY;
+    {
+      if(t->c_cflag & CMSPAR)
+        state.Parity = (t->c_cflag & PARODD) ? MARKPARITY : SPACEPARITY;
+      else
+        state.Parity = (t->c_cflag & PARODD) ? ODDPARITY : EVENPARITY;
+    }
   else
     state.Parity = NOPARITY;
 
@@ -1068,6 +1073,10 @@ fhandler_serial::tcgetattr (struct termios *t)
     t->c_cflag |= (PARENB | PARODD);
   if (state.Parity == EVENPARITY)
     t->c_cflag |= PARENB;
+  if (state.Parity == MARKPARITY)
+    t->c_cflag |= (PARENB | PARODD | CMSPAR);
+  if (state.Parity == SPACEPARITY)
+    t->c_cflag |= (PARENB | CMSPAR);
 
   /* -------------- Parity errors ------------------ */
 
diff --git a/winsup/cygwin/include/sys/termios.h b/winsup/cygwin/include/sys/termios.h
index 17e8d83a3..e4465fca3 100644
--- a/winsup/cygwin/include/sys/termios.h
+++ b/winsup/cygwin/include/sys/termios.h
@@ -206,6 +206,7 @@ POSIX commands */
 
 #define CRTSXOFF 0x04000
 #define CRTSCTS	 0x08000
+#define CMSPAR	 0x40000000 /* Mark or space (stick) parity.  */
 
 /* lflag bits */
 #define ISIG	0x0001
-- 
2.30.0