text: /*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
  │vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
  ╞══════════════════════════════════════════════════════════════════════════════╡
  │ Copyright 2020 Justine Alexandra Roberts Tunney                              │
  │                                                                              │
  │ Permission to use, copy, modify, and/or distribute this software for         │
  │ any purpose with or without fee is hereby granted, provided that the         │
  │ above copyright notice and this permission notice appear in all copies.      │
  │                                                                              │
  │ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
  │ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
  │ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
  │ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
  │ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
  │ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
  │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
  │ PERFORMANCE OF THIS SOFTWARE.                                                │
  ╚─────────────────────────────────────────────────────────────────────────────*/
  #include "libc/calls/calls.h"
  #include "libc/nexgen32e/rdtsc.h"
  #include "libc/nt/dll.h"
  #include "libc/nt/events.h"
  #include "libc/nt/struct/point.h"
  #include "libc/rand/rand.h"
  
  /**
   * Returns somewhat randomish number on Windows.
   */
  textwindows int64_t winrandish(void) {
    int64_t res;
    struct NtPoint point;
    res = ((int64_t)getpid() << 17) ^ gettid() ^ rdtsc();
    /*
     * This function is intended for older CPUs built before 2012, so
     * let's avoid having our CUI apps yoink USER32.DLL until we're
     * certain we need it, thus avoiding a hundred lines of noise in
     * NtTrace.exe output.
     */
    typeof(GetCursorPos) *GetCursorPos_ =
        GetProcAddress(GetModuleHandle("user32.dll"), "GetCursorPos");
    if (GetCursorPos_ && GetCursorPos_(&point)) res ^= point.x * point.y;
    return res;
  }
  