79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
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/* $OpenBSD: arc4random_win.h,v 1.6 2016/06/30 12:17:29 bcook Exp $ */
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/*
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* Copyright (c) 1996, David Mazieres <dm@uun.org>
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* Copyright (c) 2008, Damien Miller <djm@openbsd.org>
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* Copyright (c) 2013, Markus Friedl <markus@openbsd.org>
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* Copyright (c) 2014, Theo de Raadt <deraadt@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* 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 WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* Stub functions for portability.
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*/
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#include <windows.h>
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static volatile HANDLE arc4random_mtx = NULL;
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/*
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* Initialize the mutex on the first lock attempt. On collision, each thread
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* will attempt to allocate a mutex and compare-and-swap it into place as the
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* global mutex. On failure to swap in the global mutex, the mutex is closed.
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*/
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#define _ARC4_LOCK() { \
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if (!arc4random_mtx) { \
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HANDLE p = CreateMutex(NULL, FALSE, NULL); \
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if (InterlockedCompareExchangePointer((void **)&arc4random_mtx, (void *)p, NULL)) \
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CloseHandle(p); \
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} \
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WaitForSingleObject(arc4random_mtx, INFINITE); \
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} \
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#define _ARC4_UNLOCK() ReleaseMutex(arc4random_mtx)
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static inline void
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_getentropy_fail(void)
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{
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TerminateProcess(GetCurrentProcess(), 0);
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}
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static inline int
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_rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
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{
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*rsp = VirtualAlloc(NULL, sizeof(**rsp),
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MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
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if (*rsp == NULL)
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return (-1);
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*rsxp = VirtualAlloc(NULL, sizeof(**rsxp),
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MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
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if (*rsxp == NULL) {
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VirtualFree(*rsp, 0, MEM_RELEASE);
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*rsp = NULL;
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return (-1);
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}
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return (0);
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}
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static inline void
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_rs_forkhandler(void)
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{
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}
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static inline void
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_rs_forkdetect(void)
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{
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}
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