enable errcheck linter

.golangci.yml

@@ -6,7 +6,7 @@ run:
   go: '1.24'
 
 linters:
-  disable: [dupl, errcheck]
+  disable: [dupl]
   enable:
     # Default enabled linters
     - errcheck # Check for unchecked errors
@@ -38,6 +38,12 @@ linters:
     errcheck:
       check-type-assertions: true
       check-blank: true
+      exclude-functions:
+        - fmt.Fprintf
+        - fmt.Fprintln
+        - fmt.Printf
+        - fmt.Println
+        - fmt.Errorf
 
     revive:
       severity: warning

cmd/x32-cli/cli.go

@@ -107,7 +107,11 @@ func run(ctx *kong.Context, config Config) error {
 	if err != nil {
 		return fmt.Errorf("failed to connect to X32 device: %w", err)
 	}
-	defer client.Close()
+	defer func() {
+		if err := client.Close(); err != nil {
+			log.Errorf("failed to close client connection: %v", err)
+		}
+	}()
 
 	client.StartListening()
 	resp, err := client.RequestInfo()
@@ -132,7 +136,7 @@ func connect(config Config) (*xair.X32Client, error) {
 		xair.WithTimeout(config.Timeout),
 	)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("failed to create X32 client: %w", err)
 	}
 
 	return client, nil

cmd/xair-cli/cli.go

@@ -105,7 +105,11 @@ func run(ctx *kong.Context, config Config) error {
 	if err != nil {
 		return fmt.Errorf("failed to connect to X-Air device: %w", err)
 	}
-	defer client.Close()
+	defer func() {
+		if err := client.Close(); err != nil {
+			log.Errorf("failed to close client connection: %v", err)
+		}
+	}()
 
 	client.StartListening()
 	resp, err := client.RequestInfo()
@@ -130,7 +134,7 @@ func connect(config Config) (*xair.XAirClient, error) {
 		xair.WithTimeout(config.Timeout),
 	)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("failed to create X-Air client: %w", err)
 	}
 
 	return client, nil

internal/xair/client.go

@@ -87,11 +87,14 @@ func (c *client) StartListening() {
 }
 
 // Close stops the client and closes the connection.
-func (c *client) Close() {
+func (c *client) Close() error {
 	close(c.done)
 	if c.conn != nil {
-		c.conn.Close()
+		if err := c.conn.Close(); err != nil {
+			return fmt.Errorf("failed to close connection: %w", err)
 		}
+	}
+	return nil
 }
 
 // SendMessage sends an OSC message to the mixer using the unified connection.

internal/xair/engine.go

@@ -45,7 +45,9 @@ func newEngine(
 
 	mixerAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf("%s:%d", mixerIP, mixerPort))
 	if err != nil {
-		conn.Close()
+		if err := conn.Close(); err != nil {
+			log.Errorf("failed to close UDP connection: %v", err)
+		}
 		return nil, fmt.Errorf("failed to resolve mixer address: %w", err)
 	}
 
@@ -78,7 +80,10 @@ func (e *engine) receiveLoop() {
 			return
 		default:
 			// Set a short read deadline to prevent blocking indefinitely
-			e.conn.SetReadDeadline(time.Now().Add(100 * time.Millisecond))
+			if err := e.conn.SetReadDeadline(time.Now().Add(100 * time.Millisecond)); err != nil {
+				log.Errorf("Failed to set read deadline: %v", err)
+				continue
+			}
 			n, _, err := e.conn.ReadFromUDP(buffer)
 			if err != nil {
 				var netErr net.Error