stdio_native: initial import

Makefile.dep

@@ -423,7 +423,7 @@ ifneq (,$(filter newlib,$(USEMODULE)))
   ifeq (,$(filter newlib_syscalls_%,$(USEMODULE)))
     USEMODULE += newlib_syscalls_default
   endif
-  ifeq (,$(filter stdio_cdc_acm stdio_null stdio_rtt,$(USEMODULE)))
+  ifeq (,$(filter stdio_cdc_acm stdio_native stdio_null stdio_rtt,$(USEMODULE)))
     USEMODULE += stdio_uart
   endif
 endif

cpu/native/Makefile

@@ -15,6 +15,10 @@ ifneq (,$(filter socket_zep,$(USEMODULE)))
   DIRS += socket_zep
 endif
 
+ifneq (,$(filter stdio_native,$(USEMODULE)))
+  DIRS += stdio_native
+endif
+
 ifneq (,$(filter mtd_native,$(USEMODULE)))
   DIRS += mtd
 endif

cpu/native/Makefile.dep

@@ -1,3 +1,6 @@
 ifneq (,$(filter periph_spi,$(USEMODULE)))
   USEMODULE += periph_spidev_linux
 endif
+ifeq (,$(filter stdio_%,$(USEMODULE)))
+  USEMODULE += stdio_native
+endif

cpu/native/startup.c

@@ -41,6 +41,7 @@
 
 #include "board_internal.h"
 #include "native_internal.h"
+#include "stdio_base.h"
 #include "tty_uart.h"
 
 #include "periph/init.h"
@@ -399,6 +400,8 @@ static void _reset_handler(void)
 __attribute__((constructor)) static void startup(int argc, char **argv, char **envp)
 {
     _native_init_syscalls();
+    /* initialize stdio as early as possible */
+    stdio_init();
 
     _native_argv = argv;
     _progname = argv[0];

cpu/native/stdio_native/Makefile

@@ -0,0 +1 @@
+include $(RIOTBASE)/Makefile.base

cpu/native/stdio_native/stdio_native.c

@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2019 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @{
+ *
+ * @file
+ * @author  Martine S. Lenders <[email protected]>
+ */
+
+#include "kernel_defines.h"
+#include "native_internal.h"
+#include "vfs.h"
+
+#include "stdio_base.h"
+
+void stdio_init(void)
+{
+    if (IS_USED(MODULE_VFS)) {
+        vfs_bind_stdio();
+    }
+}
+
+ssize_t stdio_read(void* buffer, size_t max_len)
+{
+    return real_read(STDIN_FILENO, buffer, max_len);
+}
+
+ssize_t stdio_write(const void* buffer, size_t len)
+{
+    return real_write(STDOUT_FILENO, buffer, len);
+}
+
+/** @} */