45 lines
2.7 KiB
C
45 lines
2.7 KiB
C
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/*-*- 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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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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