v1.14.3

ADDED:
* Convenience function to return a namespace FD and its type from a
  namespace ID (Linux only)

errs/errs_linux.go

@@ -0,0 +1,9 @@
+package errs
+
+import (
+	"errors"
+)
+
+var (
+	ErrInvalidNs error = errors.New("invalid namespace identifier")
+)