misc/wasm: fix panic on os.Stdout.Sync() in the browser

Before this change running os.Stdout.Sync() in the browser would panic
the application with:

panic: syscall/js: Value.Call: property fsync is not a function, got undefined

Afterwards Sync() becomes a noop for compatibility reasons.

Change-Id: I1fcef694beb35fdee3173f87371e1ff233b15d32
Reviewed-on: https://go-review.googlesource.com/c/143138
Reviewed-by: Richard Musiol <neelance@gmail.com>
Run-TryBot: Richard Musiol <neelance@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

diff --git a/misc/wasm/wasm_exec.js b/misc/wasm/wasm_exec.js
index bd9754e53a354f982084fd4eaf43800a0ab33738..78eb306253d669fa7a0fb362c59b4e3a815a5b33 100644 (file)
--- a/misc/wasm/wasm_exec.js
+++ b/misc/wasm/wasm_exec.js
@@ -59,6 +59,9 @@
                                err.code = "ENOSYS";
                                callback(err);
                        },
+                       fsync(fd, callback) {
+                               callback(null);
+                       },
                };
        }