Improved error handling

src/directory/Walk.go

@@ -9,11 +9,11 @@ const blockSize = 4096
 
 // Walk calls your callback function for every file name inside the directory.
 // It doesn't distinguish between files and directories.
-func Walk(directory string, callBack func(string)) {
+func Walk(directory string, callBack func(string)) error {
 	fd, err := syscall.Open(directory, 0, 0)
 
 	if err != nil {
-		panic(err)
+		return err
 	}
 
 	defer syscall.Close(fd)
@@ -23,7 +23,7 @@ func Walk(directory string, callBack func(string)) {
 		n, err := syscall.ReadDirent(fd, buffer)
 
 		if err != nil {
-			panic(err)
+			return err
 		}
 
 		if n <= 0 {
@@ -58,4 +58,6 @@ func Walk(directory string, callBack func(string)) {
 			}
 		}
 	}
+
+	return nil
 }