arc4random_win.h (2069B)
1 /* $OpenBSD: arc4random_win.h,v 1.3 2014/07/20 16:59:31 bcook Exp $ */ 2 3 /* 4 * Copyright (c) 1996, David Mazieres <dm@uun.org> 5 * Copyright (c) 2008, Damien Miller <djm@openbsd.org> 6 * Copyright (c) 2013, Markus Friedl <markus@openbsd.org> 7 * 8 * Permission to use, copy, modify, and distribute this software for any 9 * purpose with or without fee is hereby granted, provided that the above 10 * copyright notice and this permission notice appear in all copies. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 */ 20 21 /* 22 * Stub functions for portability. 23 */ 24 25 #include <windows.h> 26 27 static volatile HANDLE arc4random_mtx = NULL; 28 29 /* 30 * Initialize the mutex on the first lock attempt. On collision, each thread 31 * will attempt to allocate a mutex and compare-and-swap it into place as the 32 * global mutex. On failure to swap in the global mutex, the mutex is closed. 33 */ 34 #define _ARC4_LOCK() { \ 35 if (!arc4random_mtx) { \ 36 HANDLE p = CreateMutex(NULL, FALSE, NULL); \ 37 if (InterlockedCompareExchangePointer((void **)&arc4random_mtx, (void *)p, NULL)) \ 38 CloseHandle(p); \ 39 } \ 40 WaitForSingleObject(arc4random_mtx, INFINITE); \ 41 } \ 42 43 #define _ARC4_UNLOCK() ReleaseMutex(arc4random_mtx) 44 45 static inline void 46 _getentropy_fail(void) 47 { 48 TerminateProcess(GetCurrentProcess(), 0); 49 } 50 51 static inline int 52 _rs_allocate(struct _rs **rsp, struct _rsx **rsxp) 53 { 54 *rsp = calloc(1, sizeof(**rsp)); 55 if (*rsp == NULL) 56 return (-1); 57 58 *rsxp = calloc(1, sizeof(**rsxp)); 59 if (*rsxp == NULL) { 60 free(*rsp); 61 return (-1); 62 } 63 return (0); 64 } 65 66 static inline void 67 _rs_forkhandler(void) 68 { 69 } 70 71 static inline void 72 _rs_forkdetect(void) 73 { 74 }