From c1652b68e24e1f84f3af9dac44ab334c67d39a9e Mon Sep 17 00:00:00 2001
From: tth <sigfood@dinorama.fr>
Date: Wed, 12 Dec 2018 22:26:54 +0100
Subject: [PATCH] serial : timeout in prgress

---
 serial/serial.c | 27 +++++++++++++++++++++++++++
 serial/t.c      |  8 +++++---
 2 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/serial/serial.c b/serial/serial.c
index 471907c..5a51a57 100644
--- a/serial/serial.c
+++ b/serial/serial.c
@@ -121,6 +121,8 @@ int getbyte_to (int fd, int to_ms)
 {
 unsigned char   byte;
 struct timeval	timeout;
+fd_set 		rfds;
+int		retval;
 
 timeout.tv_sec  = to_ms / 1000;
 timeout.tv_usec = (to_ms % 1000) * 1000;
@@ -130,6 +132,31 @@ fprintf(stderr, "timeout %6d is %4ld %6ld\n", to_ms,
 				timeout.tv_sec, timeout.tv_usec);
 #endif
 
+FD_ZERO   (&rfds);
+FD_SET    (fd, &rfds);
+
+retval = select(1, &rfds, NULL, NULL, &timeout);
+
+#if DEBUG_LEVEL
+fprintf(stderr, "%s : select -> %d\n", __func__, retval);
+#endif
+
+retval = retval < 0 ? -1 : retval;
+
+switch (retval) {
+
+	case -1:
+		fprintf(stderr, "omg ?\n");		break;
+
+	case 0:
+		fprintf(stderr, "timeout\n");		break;
+
+
+
+	default:
+		return -99;
+	}
+
 
 
 
diff --git a/serial/t.c b/serial/t.c
index cbc43aa..8a75043 100644
--- a/serial/t.c
+++ b/serial/t.c
@@ -1,6 +1,7 @@
 
 
 #include  <stdio.h>
+#include  <time.h>
 
 #include  "serial.h"
 
@@ -18,9 +19,10 @@ for (foo=0; foo<20; foo++) {
 	if (byte < 0) {
 		fprintf(stderr, "get byte : err is %d\n", byte);
 		}
-	else	{
-		printf("%6d   %6d    %02x\n", foo, to, byte);
-		}
+	// XXX else	{
+		printf("%9ld   %6d   %6d    %02x\n",
+				time(NULL), foo, to, byte);
+	// XXX	}
 	}
 
 return 0;