Update IDF to a0468b2 (#2108)

* Update IDF to a0468b2

* add missing ld file

* Fix PIO builds and change coex policy

tools/sdk/include/coap/prng.h

@@ -0,0 +1,106 @@
+/*
+ * prng.h -- Pseudo Random Numbers
+ *
+ * Copyright (C) 2010-2011 Olaf Bergmann <bergmann@tzi.org>
+ *
+ * This file is part of the CoAP library libcoap. Please see README for terms
+ * of use.
+ */
+
+/**
+ * @file prng.h
+ * @brief Pseudo Random Numbers
+ */
+
+#ifndef _COAP_PRNG_H_
+#define _COAP_PRNG_H_
+
+/**
+ * @defgroup prng Pseudo Random Numbers
+ * @{
+ */
+
+#if defined(WITH_POSIX) || (defined(WITH_LWIP) && !defined(LWIP_RAND))
+#include <stdlib.h>
+
+/**
+ * Fills \p buf with \p len random bytes. This is the default implementation for
+ * prng(). You might want to change prng() to use a better PRNG on your specific
+ * platform.
+ */
+static inline int
+coap_prng_impl(unsigned char *buf, size_t len) {
+  while (len--)
+    *buf++ = rand() & 0xFF;
+  return 1;
+}
+#endif /* WITH_POSIX */
+
+#ifdef WITH_CONTIKI
+#include <string.h>
+
+/**
+ * Fills \p buf with \p len random bytes. This is the default implementation for
+ * prng(). You might want to change prng() to use a better PRNG on your specific
+ * platform.
+ */
+static inline int
+contiki_prng_impl(unsigned char *buf, size_t len) {
+  unsigned short v = random_rand();
+  while (len > sizeof(v)) {
+    memcpy(buf, &v, sizeof(v));
+    len -= sizeof(v);
+    buf += sizeof(v);
+    v = random_rand();
+  }
+
+  memcpy(buf, &v, len);
+  return 1;
+}
+
+#define prng(Buf,Length) contiki_prng_impl((Buf), (Length))
+#define prng_init(Value) random_init((unsigned short)(Value))
+#endif /* WITH_CONTIKI */
+
+#if defined(WITH_LWIP) && defined(LWIP_RAND)
+static inline int
+lwip_prng_impl(unsigned char *buf, size_t len) {
+  u32_t v = LWIP_RAND();
+  while (len > sizeof(v)) {
+    memcpy(buf, &v, sizeof(v));
+    len -= sizeof(v);
+    buf += sizeof(v);
+    v = LWIP_RAND();
+  }
+
+  memcpy(buf, &v, len);
+  return 1;
+}
+
+#define prng(Buf,Length) lwip_prng_impl((Buf), (Length))
+#define prng_init(Value)
+
+#endif /* WITH_LWIP */
+
+#ifndef prng
+/**
+ * Fills \p Buf with \p Length bytes of random data.
+ *
+ * @hideinitializer
+ */
+#define prng(Buf,Length) coap_prng_impl((Buf), (Length))
+#endif
+
+#ifndef prng_init
+/**
+ * Called to set the PRNG seed. You may want to re-define this to allow for a
+ * better PRNG.
+ *
+ * @hideinitializer
+ */
+#define prng_init(Value) srand((unsigned long)(Value))
+#endif
+
+/** @} */
+
+#endif /* _COAP_PRNG_H_ */