emsdk/upstream/emscripten/test/hello_world_worker.c

// Copyright 2011 The Emscripten Authors.  All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License.  Both these licenses can be
// found in the LICENSE file.

#include <string.h>
#include <stdio.h>
#include <emscripten.h>

int main() {
  // this should not crash, but also should not show up anywhere if you are in a worker
  printf("you should not see this text when in a worker!\n");
  FILE *f = fopen("file.dat", "r");
  char buffer[100];
  buffer[0] = 0;
  if (f) fread(buffer, 10, 1, f);
  char buffer2[100];
  int n = sprintf(buffer2, "if (typeof postMessage !== 'undefined') { postMessage('hello from worker, and :%s:') }", buffer);
  printf("sprintf: %d\n", n);
  emscripten_run_script(buffer2);
}