From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001 From: "Matt A. Tobin" Date: Fri, 2 Feb 2018 04:16:08 -0500 Subject: Add m-esr52 at 52.6.0 --- xpcom/io/nsISafeOutputStream.idl | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 xpcom/io/nsISafeOutputStream.idl (limited to 'xpcom/io/nsISafeOutputStream.idl') diff --git a/xpcom/io/nsISafeOutputStream.idl b/xpcom/io/nsISafeOutputStream.idl new file mode 100644 index 000000000..c62d85f07 --- /dev/null +++ b/xpcom/io/nsISafeOutputStream.idl @@ -0,0 +1,39 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "nsISupports.idl" + +/** + * This interface provides a mechanism to control an output stream + * that takes care not to overwrite an existing target until it is known + * that all writes to the destination succeeded. + * + * An object that supports this interface is intended to also support + * nsIOutputStream. + * + * For example, a file output stream that supports this interface writes to + * a temporary file, and moves it over the original file when |finish| is + * called only if the stream can be successfully closed and all writes + * succeeded. If |finish| is called but something went wrong during + * writing, it will delete the temporary file and not touch the original. + * If the stream is closed by calling |close| directly, or the stream + * goes away, the original file will not be overwritten, and the temporary + * file will be deleted. + * + * Currently, this interface is implemented only for file output streams. + */ +[scriptable, uuid(5f914307-5c34-4e1f-8e32-ec749d25b27a)] +interface nsISafeOutputStream : nsISupports +{ + /** + * Call this method to close the stream and cause the original target + * to be overwritten. Note: if any call to |write| failed to write out + * all of the data given to it, then calling this method will |close| the + * stream and return failure. Further, if closing the stream fails, this + * method will return failure. The original target will be overwritten only + * if all calls to |write| succeeded and the stream was successfully closed. + */ + void finish(); +}; -- cgit v1.2.3