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/* $OpenBSD: arc4random_win.h,v 1.6 2016/06/30 12:17:29 bcook Exp $ */
/*
* Copyright (c) 1996, David Mazieres <dm@uun.org>
* Copyright (c) 2008, Damien Miller <djm@openbsd.org>
* Copyright (c) 2013, Markus Friedl <markus@openbsd.org>
* Copyright (c) 2014, Theo de Raadt <deraadt@openbsd.org>
*
* Permission to use, copy, modify, and 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.
*/
/*
* Stub functions for portability.
*/
#include <windows.h>
static volatile HANDLE arc4random_mtx = NULL;
/*
* Initialize the mutex on the first lock attempt. On collision, each thread
* will attempt to allocate a mutex and compare-and-swap it into place as the
* global mutex. On failure to swap in the global mutex, the mutex is closed.
*/
#define _ARC4_LOCK() { \
if (!arc4random_mtx) { \
HANDLE p = CreateMutex(NULL, FALSE, NULL); \
if (InterlockedCompareExchangePointer((void **)&arc4random_mtx, (void *)p, NULL)) \
CloseHandle(p); \
} \
WaitForSingleObject(arc4random_mtx, INFINITE); \
} \
#define _ARC4_UNLOCK() ReleaseMutex(arc4random_mtx)
static inline void
_getentropy_fail(void)
{
TerminateProcess(GetCurrentProcess(), 0);
}
static inline int
_rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
{
*rsp = VirtualAlloc(NULL, sizeof(**rsp),
MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
if (*rsp == NULL)
return (-1);
*rsxp = VirtualAlloc(NULL, sizeof(**rsxp),
MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
if (*rsxp == NULL) {
VirtualFree(*rsp, 0, MEM_RELEASE);
*rsp = NULL;
return (-1);
}
return (0);
}
static inline void
_rs_forkhandler(void)
{
}
static inline void
_rs_forkdetect(void)
{
}
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