1 files changed, 78 insertions, 0 deletions
diff --git a/compat/arc4random_win.h b/compat/arc4random_win.h
new file mode 100644
index 0000000..deec8a1
--- /dev/null
+++ b/compat/arc4random_win.h
@@ -0,0 +1,78 @@
+/*	$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)
+{
+}