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