1 files changed, 83 insertions, 0 deletions
diff --git a/newlib/libc/stdlib/arc4random.h b/newlib/libc/stdlib/arc4random.h
new file mode 100644
index 000000000..938a80b2e
--- /dev/null
+++ b/newlib/libc/stdlib/arc4random.h
@@ -0,0 +1,83 @@
+/*-
+ * Copyright (c) 2016 embedded brains GmbH
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Newlib ports may override the default implementations via the following
+ * define and macros
+ *  o _ARC4RANDOM_DATA,
+ *  o _ARC4RANDOM_GETENTROPY_FAIL(),
+ *  o _ARC4RANDOM_ALLOCATE(rsp, rspx), and
+ *  o _ARC4RANDOM_FORKDETECT().
+ */
+#include <machine/_arc4random.h>
+
+#include <sys/lock.h>
+#include <signal.h>
+
+__LOCK_INIT(static, _arc4random_mutex);
+
+#define _ARC4_LOCK() __lock_acquire(_arc4random_mutex)
+
+#define _ARC4_UNLOCK() __lock_release(_arc4random_mutex)
+
+#ifdef _ARC4RANDOM_DATA
+_ARC4RANDOM_DATA
+#else
+static struct {
+	struct _rs rs;
+	struct _rsx rsx;
+} _arc4random_data;
+#endif
+
+static inline void
+_getentropy_fail(void)
+{
+#ifdef _ARC4RANDOM_GETENTROPY_FAIL
+	_ARC4RANDOM_GETENTROPY_FAIL();
+#else
+	raise(SIGKILL);
+#endif
+}
+
+static inline int
+_rs_allocate(struct _rs **rsp, struct _rsx **rsxp)
+{
+#ifdef _ARC4RANDOM_ALLOCATE
+	_ARC4RANDOM_ALLOCATE(rsp, rsxp);
+#else
+	*rsp = &_arc4random_data.rs;
+	*rsxp = &_arc4random_data.rsx;
+	return (0);
+#endif
+}
+
+static inline void
+_rs_forkdetect(void)
+{
+#ifdef _ARC4RANDOM_FORKDETECT
+	_ARC4RANDOM_FORKDETECT();
+#endif
+}