From e99082fc409234ebfe4683f488c9b1f41278cf0a Mon Sep 17 00:00:00 2001
From: Richard Musiol <mail@richard-musiol.de>
Date: Mon, 8 Oct 2018 17:52:52 +0200
Subject: [PATCH] misc/wasm: fix fs operations in browser

The commit 0e4c013 changed the syscall package so it uses the
asynchronous functions of Node.js's fs module.

This commit adapts the stubs of the fs module which are used when using
a browser instead of Node.js.

Fixes #28068.

Change-Id: Ic3a6a8aebb0db06402383bc2fea7642a4501e02c
Reviewed-on: https://go-review.googlesource.com/c/140537
Reviewed-by: Agniva De Sarker <agniva.quicksilver@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
---
 misc/wasm/wasm_exec.js | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/misc/wasm/wasm_exec.js b/misc/wasm/wasm_exec.js
index 94b9552c59..815b3fbeff 100644
--- a/misc/wasm/wasm_exec.js
+++ b/misc/wasm/wasm_exec.js
@@ -47,10 +47,17 @@
 				}
 				return buf.length;
 			},
-			openSync(path, flags, mode) {
+			write(fd, buf, offset, length, position, callback) {
+				if (offset !== 0 || length !== buf.length || position !== null) {
+					throw new Error("not implemented");
+				}
+				const n = this.writeSync(fd, buf);
+				callback(null, n);
+			},
+			open(path, flags, mode, callback) {
 				const err = new Error("not implemented");
 				err.code = "ENOSYS";
-				throw err;
+				callback(err);
 			},
 		};
 	}