From 1131ba52fdadb0d07a0fe7332e3b58aa85bfaa61 Mon Sep 17 00:00:00 2001
From: Andrey Demenev <demenev@gmail.com>
Date: Sun, 3 Feb 2019 03:35:32 +1000
Subject: [PATCH] Do not return -1 from Read() and Write()

Closes #55
---
 serial_unix.go | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/serial_unix.go b/serial_unix.go
index 8831fc2..c796c30 100644
--- a/serial_unix.go
+++ b/serial_unix.go
@@ -74,12 +74,19 @@ func (port *unixPort) Read(p []byte) (int, error) {
 		if err == unix.EINTR {
 			continue
 		}
+		if n < 0 { // Do not return -1 unix errors
+			n = 0
+		}
 		return n, err
 	}
 }
 
 func (port *unixPort) Write(p []byte) (n int, err error) {
-	return unix.Write(port.handle, p)
+	n, err = unix.Write(port.handle, p)
+	if n < 0 { // Do not return -1 unix errors
+		n = 0
+	}
+	return
 }
 
 func (port *unixPort) ResetInputBuffer() error {