From 0408d604d02c486000e85cfd3ae375fa28d49deb Mon Sep 17 00:00:00 2001
From: elv-jon <jon@eluv.io>
Date: Thu, 17 May 2018 15:45:50 -0700
Subject: [PATCH] Return closed error in mem.File.Write() after Close()

---
 mem/file.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mem/file.go b/mem/file.go
index 885e554..edd8d6f 100644
--- a/mem/file.go
+++ b/mem/file.go
@@ -230,6 +230,9 @@ func (f *File) Seek(offset int64, whence int) (int64, error) {
 }
 
 func (f *File) Write(b []byte) (n int, err error) {
+	if f.closed == true {
+		return 0, ErrFileClosed
+	}
 	if f.readOnly {
 		return 0, &os.PathError{Op: "write", Path: f.fileData.name, Err: errors.New("file handle is read only")}
 	}