Drop DTR on close. Before we depended on the ttys HUPCL setting.

1 files changed, 3 insertions, 1 deletions

diff --git a/serial.c b/serial.c
index f2287d1b..401d83bf 100644
--- a/serial.c
+++ b/serial.c
@@ -96,7 +96,9 @@ void serial_close()
             tcsetattr(ttyfd, TCSANOW, &ttyset);
 	}
 	/* Restore original terminal parameters */
-        tcsetattr(ttyfd,TCSANOW,&ttyset_old);
+	/* but make sure DTR goes down */
+	ttyset_old.c_cflag |= HUPCL;
+	tcsetattr(ttyfd,TCSANOW,&ttyset_old);
 
 	close(ttyfd);
 	ttyfd = -1;