From 3d4b8d1750b70c77c2bffe14c5d272151c75c014 Mon Sep 17 00:00:00 2001
From: Dong Heng <dongheng@espressif.com>
Date: Mon, 18 Nov 2019 17:56:46 +0800
Subject: [PATCH] feat(newlib): add libc platform header file

---
 .../newlib/newlib/port/include/sys/random.h   | 30 +++++++++++++
 .../newlib/newlib/port/include/sys/uio.h      | 21 +++++++++
 components/newlib/newlib/port/random.c        | 43 +++++++++++++++++++
 3 files changed, 94 insertions(+)
 create mode 100644 components/newlib/newlib/port/include/sys/random.h
 create mode 100644 components/newlib/newlib/port/include/sys/uio.h
 create mode 100644 components/newlib/newlib/port/random.c

diff --git a/components/newlib/newlib/port/include/sys/random.h b/components/newlib/newlib/port/include/sys/random.h
new file mode 100644
index 00000000..6de53845
--- /dev/null
+++ b/components/newlib/newlib/port/include/sys/random.h
@@ -0,0 +1,30 @@
+// Copyright 2019-2020 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef __SYS_RANDOM__
+#define __SYS_RANDOM__
+
+#include <sys/types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+ssize_t getrandom(void *buf, size_t buflen, unsigned int flags);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif //__SYS_RANDOM__
diff --git a/components/newlib/newlib/port/include/sys/uio.h b/components/newlib/newlib/port/include/sys/uio.h
new file mode 100644
index 00000000..c7d0c0b3
--- /dev/null
+++ b/components/newlib/newlib/port/include/sys/uio.h
@@ -0,0 +1,21 @@
+// Copyright 2019-2020 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#ifndef _ESP_PLATFORM_SYS_UIO_H_
+#define _ESP_PLATFORM_SYS_UIO_H_
+
+int writev(int s, const struct iovec *iov, int iovcnt);
+
+ssize_t readv(int fd, const struct iovec *iov, int iovcnt);
+
+#endif // _ESP_PLATFORM_SYS_UIO_H_
diff --git a/components/newlib/newlib/port/random.c b/components/newlib/newlib/port/random.c
new file mode 100644
index 00000000..f6709774
--- /dev/null
+++ b/components/newlib/newlib/port/random.c
@@ -0,0 +1,43 @@
+// Copyright 2019-2020 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <sys/random.h>
+#include <sys/param.h>
+#include <assert.h>
+#include <errno.h>
+#include <string.h>
+#include "esp_system.h"
+#include "esp_log.h"
+
+static const char *TAG = "RANDOM";
+
+ssize_t getrandom(void *buf, size_t buflen, unsigned int flags)
+{
+    // Flags are ignored because:
+    // - esp_random is non-blocking so it works for both blocking and non-blocking calls,
+    // - don't have opportunity so set som other source of entropy.
+
+    ESP_LOGD(TAG, "getrandom(buf=0x%x, buflen=%d, flags=%u)", (int) buf, buflen, flags);
+
+    if (buf == NULL) {
+        errno = EFAULT;
+        ESP_LOGD(TAG, "getrandom returns -1 (EFAULT)");
+        return -1;
+    }
+
+    esp_fill_random(buf, buflen);
+
+    ESP_LOGD(TAG, "getrandom returns %d", buflen);
+    return buflen;
+}