From dbab9eb6b58f70c6b1644e3275c9050e7f4d0c5e Mon Sep 17 00:00:00 2001
From: Kevin Z <zyxkad@gmail.com>
Date: Sun, 30 Jun 2024 08:51:54 -0600
Subject: [PATCH] fix port.Read will returns PortClosed error on linux if the
 buffer size is zero

---
 serial_unix.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/serial_unix.go b/serial_unix.go
index 54e55a8..c480f2b 100644
--- a/serial_unix.go
+++ b/serial_unix.go
@@ -57,6 +57,10 @@ func (port *unixPort) Close() error {
 }
 
 func (port *unixPort) Read(p []byte) (int, error) {
+	// If the buffer is empty, instantly returns instead of returns with PortClosed error later
+	if len(p) == 0 {
+		return 0, nil
+	}
 	port.closeLock.RLock()
 	defer port.closeLock.RUnlock()
 	if atomic.LoadUint32(&port.opened) != 1 {