Merge branch 'master' of https://github.com/RT-Thread/rt-thread

24 files changed, 368 insertions, 653 deletions

diff --git a/components/libc/Kconfig b/components/libc/Kconfig
index 812b1ce48c..b2af15e841 100644
--- a/components/libc/Kconfig
+++ b/components/libc/Kconfig
@@ -2,18 +2,49 @@ menu "POSIX layer and C standard library"
 
 config RT_USING_LIBC
     bool "Enable libc APIs from toolchain"
-    select RT_USING_DFS
-    select RT_USING_POSIX
     default y
 
+if RT_USING_LIBC
+    config RT_LIBC_USING_TIME
+        default y
+
+    config RT_LIBC_USING_FILEIO
+        bool "Enable libc with file operation, eg.fopen/fwrite/fread/getchar"
+        select RT_USING_DFS
+        select RT_USING_POSIX
+        default n
+
+    config RT_USING_MODULE
+        bool "Enable dynamic module with dlopen/dlsym/dlclose feature"
+        default n
+
+    if RT_USING_MODULE
+        config RT_USING_CUSTOM_DLMODULE
+            bool "Enable load dynamic module by custom"
+            default n
+    endif
+endif
+
+if RT_USING_LIBC != y
+    config RT_LIBC_USING_TIME
+    bool "Enable time functions without compiler's libc"
+    default y
+endif
+
+config RT_LIBC_DEFAULT_TIMEZONE
+    depends on (RT_LIBC_USING_TIME || RT_USING_LIBC)
+    int "Set the default time zone (UTC+)"
+    range -12 12
+    default 8
+
 config RT_USING_PTHREADS
     bool "Enable pthreads APIs"
     default n
 
 if RT_USING_PTHREADS
     config PTHREAD_NUM_MAX
-    int "Maximum number of pthreads"
-    default 8
+        int "Maximum number of pthreads"
+        default 8
 endif
 
 if RT_USING_DFS
@@ -42,32 +73,4 @@ if RT_USING_DFS
 
 endif
 
-if RT_USING_LIBC
-    config RT_LIBC_USING_TIME
-        default y
-
-    config RT_USING_MODULE
-        bool "Enable dynamic module with dlopen/dlsym/dlclose feature"
-        default n
-
-    if RT_USING_MODULE
-        config RT_USING_CUSTOM_DLMODULE
-            bool "Enable load dynamic module by custom"
-            default n
-    endif
-
-endif
-
-if RT_USING_LIBC != y
-    config RT_LIBC_USING_TIME
-    bool "Enable time functions without compiler's libc"
-    default y
-endif
-
-config RT_LIBC_DEFAULT_TIMEZONE
-    depends on (RT_LIBC_USING_TIME || RT_USING_LIBC)
-    int "Set the default time zone (UTC+)"
-    range -12 12
-    default 8
-
 endmenu
diff --git a/components/libc/compilers/armlibc/SConscript b/components/libc/compilers/armlibc/SConscript
index 52f7a6d93a..bf1a299304 100644
--- a/components/libc/compilers/armlibc/SConscript
+++ b/components/libc/compilers/armlibc/SConscript
@@ -1,21 +1,12 @@
 from building import *
 Import('rtconfig')
 
-src   = Glob('*.c') + Glob('*.cpp')
-cwd   = GetCurrentDir()
+src   = Glob('*.c')
 group = []
 
-CPPPATH = [cwd]
 CPPDEFINES = ['RT_USING_ARM_LIBC']
 
-if GetDepend('RT_USING_DFS') == False:
-    SrcRemove(src, ['stdio.c'])
-
-if GetDepend('RT_USING_MODULE') == False:
-    SrcRemove(src, ['libc_syms.c'])
-
 if rtconfig.PLATFORM == 'armcc' or rtconfig.PLATFORM == 'armclang':
-    group = DefineGroup('libc', src, depend = ['RT_USING_LIBC'], 
-        CPPPATH = CPPPATH, CPPDEFINES = CPPDEFINES)
+    group = DefineGroup('libc', src, depend = ['RT_USING_LIBC'], CPPDEFINES = CPPDEFINES)
 
 Return('group')
diff --git a/components/libc/compilers/armlibc/libc.c b/components/libc/compilers/armlibc/libc.c
deleted file mode 100644
index 889c687309..0000000000
--- a/components/libc/compilers/armlibc/libc.c
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * Copyright (c) 2006-2021, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2017/10/15     bernard      the first version
- */
-#include <fcntl.h>
-#include <rtthread.h>
-#include "libc.h"
-
-#ifdef RT_USING_PTHREADS
-#include <pthread.h>
-#endif
-
-int libc_system_init(void)
-{
-#if defined(RT_USING_DFS) & defined(RT_USING_DFS_DEVFS)
-    rt_device_t dev_console;
-
-    dev_console = rt_console_get_device();
-    if (dev_console)
-    {
-    #if defined(RT_USING_POSIX)
-        libc_stdio_set_console(dev_console->parent.name, O_RDWR);
-    #else
-        libc_stdio_set_console(dev_console->parent.name, O_WRONLY);
-    #endif
-    }
-#endif
-
-#if defined RT_USING_PTHREADS && !defined RT_USING_COMPONENTS_INIT
-    pthread_system_init();
-#endif
-
-    return 0;
-}
-INIT_COMPONENT_EXPORT(libc_system_init);
diff --git a/components/libc/compilers/armlibc/libc.h b/components/libc/compilers/armlibc/libc.h
deleted file mode 100644
index 5c1613728e..0000000000
--- a/components/libc/compilers/armlibc/libc.h
+++ /dev/null
@@ -1,25 +0,0 @@
-/*
- * Copyright (c) 2006-2021, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2017/10/15     bernard      the first version
- */
-#ifndef __RTT_LIBC_H__
-#define __RTT_LIBC_H__
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-int libc_system_init(void);
-int libc_stdio_get_console(void);
-int libc_stdio_set_console(const char* device_name, int mode);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif
diff --git a/components/libc/compilers/armlibc/stdio.c b/components/libc/compilers/armlibc/stdio.c
deleted file mode 100644
index 7dd9dbfe3f..0000000000
--- a/components/libc/compilers/armlibc/stdio.c
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * Copyright (c) 2006-2021, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2017/10/15     bernard      implement stdio for armcc.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include <rtthread.h>
-#include "libc.h"
-
-#if defined(RT_USING_DFS) && defined(RT_USING_DFS_DEVFS)
-#include <dfs_posix.h>
-
-#define STDIO_DEVICE_NAME_MAX   32
-
-static int std_fd = -1;
-
-int libc_stdio_set_console(const char* device_name, int mode)
-{
-    int fd;
-    char name[STDIO_DEVICE_NAME_MAX];
-
-    snprintf(name, sizeof(name) - 1, "/dev/%s", device_name);
-    name[STDIO_DEVICE_NAME_MAX - 1] = '\0';
-
-    fd = open(name, mode, 0);
-    if (fd >= 0)
-    {
-        if (std_fd >= 0)
-        {
-            close(std_fd);
-        }
-        std_fd = fd;
-    }
-
-    return std_fd;
-}
-
-int libc_stdio_get_console(void)
-{
-    return std_fd;
-}
-
-#endif
diff --git a/components/libc/compilers/armlibc/syscalls.c b/components/libc/compilers/armlibc/syscalls.c
index ccdcfc86ea..755ffef1a6 100644
--- a/components/libc/compilers/armlibc/syscalls.c
+++ b/components/libc/compilers/armlibc/syscalls.c
@@ -15,14 +15,14 @@
  * 2020-02-14     Meco Man     implement _sys_tmpnam()
  */
 
-#include <string.h>
 #include <rt_sys.h>
-
 #include <rtthread.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#ifdef RT_USING_POSIX
 #include "libc.h"
-
-#ifdef RT_USING_DFS
-#include <dfs_posix.h>
 #endif
 
 #define DBG_TAG    "armlibc.syscalls"
@@ -55,7 +55,7 @@ const char __stderr_name[] = "STDERR";
  */
 FILEHANDLE _sys_open(const char *name, int openmode)
 {
-#ifdef RT_USING_DFS
+#ifdef RT_USING_POSIX
     int fd;
     int mode = O_RDONLY;
 #endif
@@ -68,8 +68,8 @@ FILEHANDLE _sys_open(const char *name, int openmode)
     if (strcmp(name, __stderr_name) == 0)
         return (STDERR);
 
-#ifndef RT_USING_DFS
-    return -1;
+#ifndef RT_USING_POSIX
+    return 0; /* error */
 #else
     /* Correct openmode from fopen to open */
     if (openmode & OPEN_PLUS)
@@ -99,21 +99,22 @@ FILEHANDLE _sys_open(const char *name, int openmode)
 
     fd = open(name, mode, 0);
     if (fd < 0)
-        return -1;
+        return 0; /* error */
     else
         return fd;
-#endif
+#endif /* RT_USING_POSIX */
 }
 
 int _sys_close(FILEHANDLE fh)
 {
-#ifndef RT_USING_DFS
-    return 0;
-#else
-    if (fh <= STDERR) return 0;
+#ifdef RT_USING_POSIX
+    if (fh <= STDERR)
+        return 0; /* error */
 
     return close(fh);
-#endif
+#else
+    return 0;
+#endif /* RT_USING_POSIX */
 }
 
 /*
@@ -143,13 +144,11 @@ int _sys_close(FILEHANDLE fh)
  */
 int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
 {
-#ifdef RT_USING_DFS
+#ifdef RT_USING_POSIX
     int size;
-#endif
 
     if (fh == STDIN)
     {
-#ifdef RT_USING_POSIX
         if (libc_stdio_get_console() < 0)
         {
             LOG_W("Do not invoke standard output before initializing libc");
@@ -157,25 +156,20 @@ int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
         }
         size = read(STDIN_FILENO, buf, len);
         return len - size;
-#else
-        /* no stdin */
-        return -1;
-#endif
     }
     else if ((fh == STDOUT) || (fh == STDERR))
     {
-        return -1;
+        return 0; /* error */
     }
 
-#ifndef RT_USING_DFS
-    return 0;
-#else
     size = read(fh, buf, len);
     if (size >= 0)
         return len - size;
     else
-        return -1;
-#endif
+        return 0; /* error */
+#else
+    return 0; /* error */
+#endif /* RT_USING_POSIX */
 }
 
 /*
@@ -185,15 +179,12 @@ int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
  */
 int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
 {
-#ifdef RT_USING_DFS
+#ifdef RT_USING_POSIX
     int size;
-#endif
+#endif /* RT_USING_POSIX */
 
     if ((fh == STDOUT) || (fh == STDERR))
     {
-#if !defined(RT_USING_CONSOLE) || !defined(RT_USING_DEVICE)
-        return 0;
-#else
 #ifdef RT_USING_POSIX
         if (libc_stdio_get_console() < 0)
         {
@@ -202,31 +193,29 @@ int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
         }
         size = write(STDOUT_FILENO, buf, len);
         return len - size;
-#else
+#elif defined(RT_USING_CONSOLE)
         if (rt_console_get_device())
         {
             rt_device_write(rt_console_get_device(), -1, buf, len);
-            return 0;
         }
 
-        return -1;
-#endif
-#endif
+        return 0; /* error */
+#endif /* RT_USING_POSIX */
     }
     else if (fh == STDIN)
     {
-        return -1;
+        return 0; /* error */
     }
 
-#ifndef RT_USING_DFS
-    return 0;
-#else
+#ifdef RT_USING_POSIX
     size = write(fh, buf, len);
     if (size >= 0)
         return len - size;
     else
-        return -1;
-#endif
+        return 0; /* error */
+#else
+    return 0;
+#endif /* RT_USING_POSIX */
 }
 
 /*
@@ -235,16 +224,15 @@ int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
  */
 int _sys_seek(FILEHANDLE fh, long pos)
 {
+#ifdef RT_USING_POSIX
     if (fh < STDERR)
-        return -1;
-
-#ifndef RT_USING_DFS
-    return -1;
-#else
+        return 0; /* error */
 
     /* position is relative to the start of file fh */
     return lseek(fh, pos, 0);
-#endif
+#else
+    return 0; /* error */
+#endif /* RT_USING_POSIX */
 }
 
 /**
@@ -270,7 +258,7 @@ void _ttywrch(int ch)
 
     c = (char)ch;
     rt_kprintf(&c);
-#endif
+#endif /* RT_USING_CONSOLE */
 }
 
 /* for exit() and abort() */
@@ -289,17 +277,17 @@ RT_WEAK void _sys_exit(int return_code)
  */
 long _sys_flen(FILEHANDLE fh)
 {
-#ifdef RT_USING_DFS
+#ifdef RT_USING_POSIX
     struct stat stat;
 
     if (fh < STDERR)
-        return -1;
+        return 0; /* error */
 
     fstat(fh, &stat);
     return stat.st_size;
 #else
-    return -1;
-#endif
+    return 0;
+#endif /* RT_USING_POSIX */
 }
 
 int _sys_istty(FILEHANDLE fh)
@@ -312,11 +300,11 @@ int _sys_istty(FILEHANDLE fh)
 
 int remove(const char *filename)
 {
-#ifndef RT_USING_DFS
-    return -1;
-#else
+#ifdef RT_USING_POSIX
     return unlink(filename);
-#endif
+#else
+    return 0; /* error */
+#endif /* RT_USING_POSIX */
 }
 
 #ifdef __MICROLIB
@@ -324,11 +312,15 @@ int remove(const char *filename)
 
 int fputc(int c, FILE *f)
 {
+#ifdef RT_USING_CONSOLE
     char ch[2] = {0};
 
     ch[0] = c;
     rt_kprintf(&ch[0]);
     return 1;
+#else
+    return 0; /* error */
+#endif /* RT_USING_CONSOLE */
 }
 
 int fgetc(FILE *f)
@@ -339,13 +331,13 @@ int fgetc(FILE *f)
     if (libc_stdio_get_console() < 0)
     {
         LOG_W("Do not invoke standard output before initializing libc");
-        return -1;
+        return 0;
     }
 
     if(read(STDIN_FILENO, &ch, 1) == 1)
         return ch;
-#endif
-
-    return -1;
+#endif /* RT_USING_POSIX */
+    return 0; /* error */
 }
-#endif
+
+#endif /* __MICROLIB */
diff --git a/components/libc/compilers/common/SConscript b/components/libc/compilers/common/SConscript
index b7a6626a36..504bf84e56 100644
--- a/components/libc/compilers/common/SConscript
+++ b/components/libc/compilers/common/SConscript
@@ -1,5 +1,4 @@
 from building import *
-
 Import('rtconfig')
 
 src   = []
@@ -8,13 +7,13 @@ group = []
 CPPPATH = [cwd]
 CPPDEFINES = []
 
+if rtconfig.CROSS_TOOL == 'keil':
+    CPPDEFINES += ['__CLK_TCK=RT_TICK_PER_SECOND']
+
 if GetDepend('RT_USING_LIBC'):
     src += Glob('*.c')
 elif GetDepend('RT_LIBC_USING_TIME'):
-    src += Glob('time.c')
-
-if rtconfig.CROSS_TOOL == 'keil':
-    CPPDEFINES += ['__CLK_TCK=RT_TICK_PER_SECOND']
+    src += ['time.c']
 
 group = DefineGroup('libc', src, depend = [], CPPPATH = CPPPATH, CPPDEFINES = CPPDEFINES)
 
diff --git a/components/libc/compilers/dlib/SConscript b/components/libc/compilers/dlib/SConscript
index 75a5812fab..39707abc61 100644
--- a/components/libc/compilers/dlib/SConscript
+++ b/components/libc/compilers/dlib/SConscript
@@ -1,26 +1,20 @@
 from building import *
-
 Import('rtconfig')
 
 src   = Glob('*.c')
-cwd   = GetCurrentDir()
 group = []
 
-CPPPATH    = [cwd]
 CPPDEFINES = ['RT_USING_DLIBC']
 
 if rtconfig.PLATFORM == 'iar':
-
-    if GetDepend('RT_USING_DFS'):
+    if GetDepend('RT_USING_POSIX'):
         from distutils.version import LooseVersion
         from iar import IARVersion
 
         CPPDEFINES = CPPDEFINES + ['_DLIB_FILE_DESCRIPTOR']
-
         if LooseVersion(IARVersion()) < LooseVersion("8.20.1"):
             CPPDEFINES = CPPDEFINES + ['_DLIB_THREAD_SUPPORT']
 
-    group = DefineGroup('libc', src, depend = ['RT_USING_LIBC'], 
-        CPPPATH = CPPPATH, CPPDEFINES = CPPDEFINES)
+    group = DefineGroup('libc', src, depend = ['RT_USING_LIBC'], CPPDEFINES = CPPDEFINES)
 
 Return('group')
diff --git a/components/libc/compilers/dlib/libc.c b/components/libc/compilers/dlib/libc.c
deleted file mode 100644
index f540ac955f..0000000000
--- a/components/libc/compilers/dlib/libc.c
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
- * Copyright (c) 2006-2021, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2017/10/15     bernard      the first version
- */
-#include <fcntl.h>
-#include <rtthread.h>
-#include "libc.h"
-
-#ifdef RT_USING_PTHREADS
-#include <pthread.h>
-#endif
-
-int libc_system_init(void)
-{
-#if defined(RT_USING_DFS) && defined(RT_USING_DFS_DEVFS)
-    rt_device_t dev_console;
-
-    dev_console = rt_console_get_device();
-    if (dev_console)
-    {
-    #if defined(RT_USING_POSIX)
-        libc_stdio_set_console(dev_console->parent.name, O_RDWR);
-    #else
-        libc_stdio_set_console(dev_console->parent.name, O_WRONLY);
-    #endif
-    }
-#endif
-
-#if defined (RT_USING_PTHREADS) && !defined (RT_USING_COMPONENTS_INIT)
-    pthread_system_init();
-#endif
-
-    return 0;
-}
-INIT_COMPONENT_EXPORT(libc_system_init);
-
diff --git a/components/libc/compilers/dlib/stdio.c b/components/libc/compilers/dlib/stdio.c
deleted file mode 100644
index ed3f5dfef9..0000000000
--- a/components/libc/compilers/dlib/stdio.c
+++ /dev/null
@@ -1,49 +0,0 @@
-/*
- * Copyright (c) 2006-2021, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2017/10/15     bernard      implement stdio for IAR dlib.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include <rtthread.h>
-#include "libc.h"
-
-#if defined(RT_USING_DFS) && defined(RT_USING_DFS_DEVFS)
-#include <dfs_posix.h>
-
-#define STDIO_DEVICE_NAME_MAX   32
-
-static int std_fd = -1;
-int libc_stdio_set_console(const char* device_name, int mode)
-{
-    int fd;
-    char name[STDIO_DEVICE_NAME_MAX];
-
-    snprintf(name, sizeof(name) - 1, "/dev/%s", device_name);
-    name[STDIO_DEVICE_NAME_MAX - 1] = '\0';
-
-    fd = open(name, mode, 0);
-    if (fd >= 0)
-    {
-        if (std_fd >= 0)
-        {
-            close(std_fd);
-        }
-        std_fd = fd;
-    }
-
-    return std_fd;
-}
-
-int libc_stdio_get_console(void) {
-    return std_fd;
-}
-
-#endif
diff --git a/components/libc/compilers/dlib/syscall_close.c b/components/libc/compilers/dlib/syscall_close.c
index 7ed1cc2f2d..2897c2418a 100644
--- a/components/libc/compilers/dlib/syscall_close.c
+++ b/components/libc/compilers/dlib/syscall_close.c
@@ -8,10 +8,8 @@
  * 2015-01-28     Bernard      first version
  */
 #include <rtthread.h>
-#ifdef RT_USING_DFS
-#include <dfs_posix.h>
-#endif
 #include <yfuns.h>
+#include <unistd.h>
 
 #pragma module_name = "?__close"
 int __close(int handle)
@@ -20,10 +18,9 @@ int __close(int handle)
         handle == _LLIO_STDERR ||
         handle == _LLIO_STDIN)
         return _LLIO_ERROR;
-
-#ifdef RT_USING_DFS
+#ifdef RT_USING_POSIX
     return close(handle);
 #else
-    return 0;
-#endif
+    return _LLIO_ERROR;
+#endif /* RT_USING_POSIX */
 }
diff --git a/components/libc/compilers/dlib/syscall_lseek.c b/components/libc/compilers/dlib/syscall_lseek.c
index 47a069bf0a..4ea55ef1c3 100644
--- a/components/libc/compilers/dlib/syscall_lseek.c
+++ b/components/libc/compilers/dlib/syscall_lseek.c
@@ -8,10 +8,8 @@
  * 2015-01-28     Bernard      first version
  */
 #include <rtthread.h>
-#ifdef RT_USING_DFS
-#include <dfs_posix.h>
-#endif
 #include <yfuns.h>
+#include <unistd.h>
 
 #pragma module_name = "?__lseek"
 long __lseek(int handle, long offset, int whence)
@@ -20,10 +18,9 @@ long __lseek(int handle, long offset, int whence)
         handle == _LLIO_STDERR ||
         handle == _LLIO_STDIN)
         return _LLIO_ERROR;
-
-#ifdef RT_USING_DFS
+#ifdef RT_USING_POSIX
     return lseek(handle, offset, whence);
 #else
     return _LLIO_ERROR;
-#endif
+#endif /* RT_USING_POSIX */
 }
diff --git a/components/libc/compilers/dlib/syscall_open.c b/components/libc/compilers/dlib/syscall_open.c
index 37bfcecb47..8fb3c3a11f 100644
--- a/components/libc/compilers/dlib/syscall_open.c
+++ b/components/libc/compilers/dlib/syscall_open.c
@@ -10,17 +10,13 @@
 
 #include <rtthread.h>
 #include <yfuns.h>
-#ifdef RT_USING_DFS
-#include <dfs_posix.h>
-#endif
+#include <fcntl.h>
 
 #pragma module_name = "?__open"
 
 int __open(const char *filename, int mode)
 {
-#ifndef RT_USING_DFS
-  return _LLIO_ERROR;
-#else
+#ifdef RT_USING_POSIX
   int handle;
   int open_mode = O_RDONLY;
 
@@ -70,5 +66,7 @@ int __open(const char *filename, int mode)
     return _LLIO_ERROR;
 
   return handle;
-#endif
+#else
+  return _LLIO_ERROR;
+#endif /* RT_USING_POSIX */
 }
diff --git a/components/libc/compilers/dlib/syscall_read.c b/components/libc/compilers/dlib/syscall_read.c
index ae980be6ca..74cedb966a 100644
--- a/components/libc/compilers/dlib/syscall_read.c
+++ b/components/libc/compilers/dlib/syscall_read.c
@@ -9,11 +9,11 @@
  */
 
 #include <rtthread.h>
-#ifdef RT_USING_DFS
-#include <dfs_posix.h>
-#endif
 #include <yfuns.h>
+#include <unistd.h>
+#ifdef RT_USING_POSIX
 #include "libc.h"
+#endif
 
 #define DBG_TAG    "dlib.syscall_read"
 #define DBG_LVL    DBG_INFO
@@ -22,32 +22,26 @@
 #pragma module_name = "?__read"
 size_t __read(int handle, unsigned char *buf, size_t len)
 {
-#ifdef RT_USING_DFS
+#ifdef RT_USING_POSIX
     int size;
-#endif
 
     if (handle == _LLIO_STDIN)
     {
-#ifdef RT_USING_POSIX
         if (libc_stdio_get_console() < 0)
         {
             LOG_W("Do not invoke standard input before initializing libc");
             return 0;
         }
         return read(STDIN_FILENO, buf, len);
-#else
-        return _LLIO_ERROR;
-#endif
     }
     else if ((handle == _LLIO_STDOUT) || (handle == _LLIO_STDERR))
     {
         return _LLIO_ERROR;
     }
 
-#ifndef RT_USING_DFS
-    return _LLIO_ERROR;
-#else
     size = read(handle, buf, len);
     return size;
-#endif
+#else
+    return _LLIO_ERROR;
+#endif /* RT_USING_POSIX */
 }
diff --git a/components/libc/compilers/dlib/syscall_remove.c b/components/libc/compilers/dlib/syscall_remove.c
index 7d74236f4c..05bfbb67ae 100644
--- a/components/libc/compilers/dlib/syscall_remove.c
+++ b/components/libc/compilers/dlib/syscall_remove.c
@@ -8,17 +8,15 @@
  * 2015-01-28     Bernard      first version
  */
 #include <rtthread.h>
-#ifdef RT_USING_DFS
-#include <dfs_posix.h>
-#endif
 #include <yfuns.h>
+#include <unistd.h>
 
 #pragma module_name = "?remove"
 int remove(const char *val)
 {
-#ifndef RT_USING_DFS
-    return -1;
-#else
+#ifdef RT_USING_POSIX
     return unlink(val);
-#endif
+#else
+    return -1;
+#endif /* RT_USING_POSIX */
 }
diff --git a/components/libc/compilers/dlib/syscall_write.c b/components/libc/compilers/dlib/syscall_write.c
index ffee51882d..ab011c1096 100644
--- a/components/libc/compilers/dlib/syscall_write.c
+++ b/components/libc/compilers/dlib/syscall_write.c
@@ -9,11 +9,11 @@
  */
 
 #include <rtthread.h>
-#ifdef RT_USING_DFS
-#include <dfs_posix.h>
-#endif
 #include <yfuns.h>
+#include <unistd.h>
+#ifdef RT_USING_POSIX
 #include "libc.h"
+#endif
 
 #define DBG_TAG    "dlib.syscall_write"
 #define DBG_LVL    DBG_INFO
@@ -23,16 +23,12 @@
 
 size_t __write(int handle, const unsigned char *buf, size_t len)
 {
-#ifdef RT_USING_DFS
+#ifdef RT_USING_POSIX
     int size;
-#endif
+#endif /* RT_USING_POSIX */
 
     if ((handle == _LLIO_STDOUT) || (handle == _LLIO_STDERR))
     {
-#ifndef RT_USING_CONSOLE
-        return _LLIO_ERROR;
-#else
-
 #ifdef RT_USING_POSIX
         if (libc_stdio_get_console() < 0)
         {
@@ -40,7 +36,7 @@ size_t __write(int handle, const unsigned char *buf, size_t len)
             return 0;
         }
         return write(STDOUT_FILENO, (void*)buf, len);
-#else
+#elif defined(RT_USING_CONSOLE)
         rt_device_t console_device;
 
         console_device = rt_console_get_device();
@@ -50,19 +46,19 @@ size_t __write(int handle, const unsigned char *buf, size_t len)
         }
 
         return len;
-#endif
-#endif
+#else
+        return _LLIO_ERROR;
+#endif /* RT_USING_POSIX */
     }
     else if (handle == _LLIO_STDIN)
     {
         return _LLIO_ERROR;
     }
 
-#ifndef RT_USING_DFS
-    return _LLIO_ERROR;
-#else
+#ifdef RT_USING_POSIX
     size = write(handle, buf, len);
     return size;
-#endif
+#else
+    return _LLIO_ERROR;
+#endif /* RT_USING_POSIX */
 }
-
diff --git a/components/libc/compilers/gcc/newlib/SConscript b/components/libc/compilers/gcc/newlib/SConscript
index e0ee482747..ae50098dec 100644
--- a/components/libc/compilers/gcc/newlib/SConscript
+++ b/components/libc/compilers/gcc/newlib/SConscript
@@ -4,21 +4,14 @@ Import('rtconfig')
 src = []
 cwd = GetCurrentDir()
 group = []
-LIBS = ['m']
+LIBS = ['m'] # link libm
 CPPDEFINES = ['RT_USING_NEWLIB']
 CPPPATH = [cwd]
 
 if rtconfig.PLATFORM == 'gcc':
     if GetDepend('RT_USING_LIBC'):
-        # link with libc and libm:
-        # libm is a frequently used lib. Newlib is compiled with -ffunction-sections in
-        # recent GCC tool chains. The linker would just link in the functions that have
-        # been referenced. So setting this won't result in bigger text size.
-        LIBS += ['c']
-
+        LIBS += ['c'] # link libc
         src += Glob('*.c')
-        if GetDepend('RT_USING_MODULE') == False:
-            SrcRemove(src, ['libc_syms.c'])
     else:
         src += ['syscalls.c']
 
diff --git a/components/libc/compilers/gcc/newlib/libc.c b/components/libc/compilers/gcc/newlib/libc.c
deleted file mode 100644
index 9834a9a015..0000000000
--- a/components/libc/compilers/gcc/newlib/libc.c
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * Copyright (c) 2006-2021, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2017/10/15     bernard      the first version
- */
-#include <rtthread.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <fcntl.h>
-#include <sys/time.h>
-
-#include "libc.h"
-
-#ifdef RT_USING_PTHREADS
-#include <pthread.h>
-#endif
-
-int _EXFUN(putenv,(char *__string));
-
-int libc_system_init(void)
-{
-#if defined(RT_USING_DFS) & defined(RT_USING_DFS_DEVFS) & defined(RT_USING_CONSOLE)
-    rt_device_t dev_console;
-
-    dev_console = rt_console_get_device();
-    if (dev_console)
-    {
-    #if defined(RT_USING_POSIX)
-        libc_stdio_set_console(dev_console->parent.name, O_RDWR);
-    #else
-        libc_stdio_set_console(dev_console->parent.name, O_WRONLY);
-    #endif
-    }
-
-    /* set PATH and HOME */
-    putenv("PATH=/bin");
-    putenv("HOME=/home");
-#endif
-
-#if defined RT_USING_PTHREADS && !defined RT_USING_COMPONENTS_INIT
-    pthread_system_init();
-#endif
-
-    return 0;
-}
-INIT_COMPONENT_EXPORT(libc_system_init);
diff --git a/components/libc/compilers/gcc/newlib/libc.h b/components/libc/compilers/gcc/newlib/libc.h
deleted file mode 100644
index c470698aa6..0000000000
--- a/components/libc/compilers/gcc/newlib/libc.h
+++ /dev/null
@@ -1,28 +0,0 @@
-/*
- * Copyright (c) 2006-2021, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2017/10/15     bernard      the first version
- */
-#ifndef __RTT_LIBC_H__
-#define __RTT_LIBC_H__
-
-#ifndef _EXFUN
-#define _EXFUN(name, proto)     name proto
-#endif
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-int libc_system_init(void);
-int libc_stdio_get_console(void);
-int libc_stdio_set_console(const char* device_name, int mode);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif
diff --git a/components/libc/compilers/gcc/newlib/stdio.c b/components/libc/compilers/gcc/newlib/stdio.c
deleted file mode 100644
index 1875d50e3f..0000000000
--- a/components/libc/compilers/gcc/newlib/stdio.c
+++ /dev/null
@@ -1,81 +0,0 @@
-/*
- * Copyright (c) 2006-2021, RT-Thread Development Team
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Change Logs:
- * Date           Author       Notes
- * 2017/10/15     bernard      the first version
- */
-#include <stdio.h>
-#include <stdlib.h>
-#include <fcntl.h>
-#include <rtthread.h>
-#include "libc.h"
-
-#define STDIO_DEVICE_NAME_MAX   32
-
-int _EXFUN(fileno, (FILE *));
-
-static FILE* std_console = NULL;
-
-int libc_stdio_set_console(const char* device_name, int mode)
-{
-    FILE *fp;
-    char name[STDIO_DEVICE_NAME_MAX];
-    char *file_mode;
-
-    snprintf(name, sizeof(name) - 1, "/dev/%s", device_name);
-    name[STDIO_DEVICE_NAME_MAX - 1] = '\0';
-
-    if (mode == O_RDWR) file_mode = "r+";
-    else if (mode == O_WRONLY) file_mode = "wb";
-    else file_mode = "rb";
-
-    fp = fopen(name, file_mode);
-    if (fp)
-    {
-        setvbuf(fp, NULL, _IONBF, 0);
-
-        if (std_console)
-        {
-            fclose(std_console);
-            std_console = NULL;
-        }
-        std_console = fp;
-
-        if (mode == O_RDWR)
-        {
-            _GLOBAL_REENT->_stdin  = std_console;
-        }
-        else
-        {
-            _GLOBAL_REENT->_stdin  = NULL;
-        }
-
-        if (mode == O_RDONLY)
-        {
-            _GLOBAL_REENT->_stdout = NULL;
-            _GLOBAL_REENT->_stderr = NULL;
-        }
-        else
-        {
-            _GLOBAL_REENT->_stdout = std_console;
-            _GLOBAL_REENT->_stderr = std_console;
-        }
-
-        _GLOBAL_REENT->__sdidinit = 1;
-    }
-
-    if (std_console) return fileno(std_console);
-
-    return -1;
-}
-
-int libc_stdio_get_console(void)
-{
-    if (std_console)
-        return fileno(std_console);
-    else
-        return -1;
-}
diff --git a/components/libc/compilers/gcc/newlib/syscalls.c b/components/libc/compilers/gcc/newlib/syscalls.c
index f5a2c16ecc..f95e695a85 100644
--- a/components/libc/compilers/gcc/newlib/syscalls.c
+++ b/components/libc/compilers/gcc/newlib/syscalls.c
@@ -13,9 +13,19 @@
 
 #include <reent.h>
 #include <rtthread.h>
+#include <stdio.h>
+#include <string.h>
 #include <stddef.h>
+#include <fcntl.h>
 #include <unistd.h>
 #include <sys/errno.h>
+#include <sys/stat.h>
+#ifdef RT_USING_POSIX
+#include "libc.h"
+#endif
+#ifdef RT_USING_MODULE
+#include <dlmodule.h>
+#endif
 
 #define DBG_TAG    "newlib.syscalls"
 #define DBG_LVL    DBG_INFO
@@ -83,18 +93,8 @@ void __libc_init_array(void)
 }
 
 #ifdef RT_USING_LIBC
-#include <reent.h>
-#include <stdio.h>
-#include "libc.h"
-#ifdef RT_USING_DFS
-#include <dfs_posix.h>
-#endif
-#ifdef RT_USING_MODULE
-#include <dlmodule.h>
-#endif
 
 /* Reentrant versions of system calls.  */
-
 #ifndef _REENT_ONLY
 int *__errno ()
 {
@@ -109,39 +109,29 @@ int _getpid_r(struct _reent *ptr)
 
 int _close_r(struct _reent *ptr, int fd)
 {
-#ifndef RT_USING_DFS
-    /* return "not supported" */
-    ptr->_errno = ENOTSUP;
-    return -1;
-#else
     return close(fd);
-#endif
 }
 
 int _execve_r(struct _reent *ptr, const char * name, char *const *argv, char *const *env)
 {
-    /* return "not supported" */
     ptr->_errno = ENOTSUP;
     return -1;
 }
 
 int _fcntl_r(struct _reent *ptr, int fd, int cmd, int arg)
 {
-    /* return "not supported" */
     ptr->_errno = ENOTSUP;
     return -1;
 }
 
 int _fork_r(struct _reent *ptr)
 {
-    /* return "not supported" */
     ptr->_errno = ENOTSUP;
     return -1;
 }
 
 int _fstat_r(struct _reent *ptr, int fd, struct stat *pstat)
 {
-    /* return "not supported" */
     ptr->_errno = ENOTSUP;
     return -1;
 }
@@ -160,67 +150,73 @@ int _isatty_r(struct _reent *ptr, int fd)
 
 int _kill_r(struct _reent *ptr, int pid, int sig)
 {
-    /* return "not supported" */
     ptr->_errno = ENOTSUP;
     return -1;
 }
 
 int _link_r(struct _reent *ptr, const char *old, const char *new)
 {
-    /* return "not supported" */
     ptr->_errno = ENOTSUP;
     return -1;
 }
 
-_off_t _lseek_r(struct _reent *ptr, int fd, _off_t pos, int whence)
+int _wait_r(struct _reent *ptr, int *status)
 {
-#ifndef RT_USING_DFS
-    /* return "not supported" */
     ptr->_errno = ENOTSUP;
     return -1;
-#else
+}
+
+mode_t umask(mode_t mask)
+{
+    return 022;
+}
+
+int flock(int fd, int operation)
+{
+    return 0;
+}
+
+_off_t _lseek_r(struct _reent *ptr, int fd, _off_t pos, int whence)
+{
+#ifdef RT_USING_POSIX
     _off_t rc;
 
     rc = lseek(fd, pos, whence);
     return rc;
-#endif
+#else
+    ptr->_errno = ENOTSUP;
+    return -1;
+#endif /* RT_USING_POSIX */
 }
 
 int _mkdir_r(struct _reent *ptr, const char *name, int mode)
 {
-#ifndef RT_USING_DFS
-    /* return "not supported" */
-    ptr->_errno = ENOTSUP;
-    return -1;
-#else
+#ifdef RT_USING_POSIX
     int rc;
 
     rc = mkdir(name, mode);
     return rc;
-#endif
+#else
+    ptr->_errno = ENOTSUP;
+    return -1;
+#endif /* RT_USING_POSIX */
 }
 
 int _open_r(struct _reent *ptr, const char *file, int flags, int mode)
 {
-#ifndef RT_USING_DFS
-    /* return "not supported" */
-    ptr->_errno = ENOTSUP;
-    return -1;
-#else
+#ifdef RT_USING_POSIX
     int rc;
-
     rc = open(file, flags, mode);
     return rc;
-#endif
+#else
+    ptr->_errno = ENOTSUP;
+    return -1;
+#endif /* RT_USING_POSIX */
 }
 
 _ssize_t _read_r(struct _reent *ptr, int fd, void *buf, size_t nbytes)
 {
-#ifndef RT_USING_DFS
-    /* return "not supported" */
-    ptr->_errno = ENOTSUP;
-    return -1;
-#else
+#ifdef RT_USING_POSIX
     _ssize_t rc;
     if (libc_stdio_get_console() < 0 && fd == STDIN_FILENO)
     {
@@ -229,74 +225,51 @@ _ssize_t _read_r(struct _reent *ptr, int fd, void *buf, size_t nbytes)
     }
     rc = read(fd, buf, nbytes);
     return rc;
-#endif
+#else
+    ptr->_errno = ENOTSUP;
+    return -1;
+#endif /* RT_USING_POSIX */
 }
 
 int _rename_r(struct _reent *ptr, const char *old, const char *new)
 {
-#ifndef RT_USING_DFS
-    /* return "not supported" */
-    ptr->_errno = ENOTSUP;
-    return -1;
-#else
+#ifdef RT_USING_POSIX
     int rc;
 
     rc = rename(old, new);
     return rc;
-#endif
+#else
+    ptr->_errno = ENOTSUP;
+    return -1;
+#endif /* RT_USING_POSIX */
 }
 
 int _stat_r(struct _reent *ptr, const char *file, struct stat *pstat)
 {
-#ifndef RT_USING_DFS
-    /* return "not supported" */
-    ptr->_errno = ENOTSUP;
-    return -1;
-#else
+#ifdef RT_USING_POSIX
     int rc;
 
     rc = stat(file, pstat);
     return rc;
-#endif
-}
-
-int _unlink_r(struct _reent *ptr, const char *file)
-{
-#ifndef RT_USING_DFS
-    /* return "not supported" */
+#else
     ptr->_errno = ENOTSUP;
     return -1;
-#else
-    return unlink(file);
-#endif
+#endif /* RT_USING_POSIX */
 }
 
-int _wait_r(struct _reent *ptr, int *status)
+int _unlink_r(struct _reent *ptr, const char *file)
 {
-    /* return "not supported" */
+#ifdef RT_USING_POSIX
+    return unlink(file);
+#else
     ptr->_errno = ENOTSUP;
     return -1;
+#endif /* RT_USING_POSIX */
 }
 
 _ssize_t _write_r(struct _reent *ptr, int fd, const void *buf, size_t nbytes)
 {
-#ifndef RT_USING_DFS
-#if defined(RT_USING_CONSOLE) && defined(RT_USING_DEVICE)
-    if (STDOUT_FILENO == fd)
-    {
-        rt_device_t console;
-
-        console = rt_console_get_device();
-        if (console) return rt_device_write(console, -1, buf, nbytes);
-    }
-
-    return 0;
-#else
-    /* return "not supported" */
-    ptr->_errno = ENOTSUP;
-    return -1;
-#endif /*RT_USING_DEVICE*/
-#else
+#ifdef RT_USING_POSIX
     _ssize_t rc;
     if (libc_stdio_get_console() < 0 && fd == STDOUT_FILENO)
     {
@@ -305,7 +278,18 @@ _ssize_t _write_r(struct _reent *ptr, int fd, const void *buf, size_t nbytes)
     }
     rc = write(fd, buf, nbytes);
     return rc;
-#endif
+#elif defined(RT_USING_CONSOLE)
+    if (STDOUT_FILENO == fd)
+    {
+        rt_device_t console;
+
+        console = rt_console_get_device();
+        if (console)
+            return rt_device_write(console, -1, buf, nbytes);
+    }
+#endif /* RT_USING_POSIX */
+    ptr->_errno = ENOTSUP;
+    return -1;
 }
 
 /* for exit() and abort() */
@@ -316,16 +300,6 @@ __attribute__ ((noreturn)) void _exit (int status)
     while(1);
 }
 
-mode_t umask(mode_t mask)
-{
-    return 022;
-}
-
-int flock(int fd, int operation)
-{
-    return 0;
-}
-
 /*
 These functions are implemented and replaced by the 'common/time.c' file
 int _gettimeofday_r(struct _reent *ptr, struct timeval *__tp, void *__tzp);
diff --git a/components/libc/posix/src/SConscript b/components/libc/posix/src/SConscript
index 5640181ac5..f338b52cec 100644
--- a/components/libc/posix/src/SConscript
+++ b/components/libc/posix/src/SConscript
@@ -1,10 +1,13 @@
-# RT-Thread building script for component
-
 from building import *
+Import('rtconfig')
 
-cwd     = GetCurrentDir()
 src     = Glob('*.c')
+cwd     = GetCurrentDir()
+CPPPATH = [cwd]
+
+if rtconfig.ARCH == 'sim': # the vs simulator does not support select and poll
+    SrcRemove(src, ['select.c', 'poll.c'])
 
-group = DefineGroup('POSIX', src, depend = ['RT_USING_POSIX'])
+group = DefineGroup('POSIX', src, depend = ['RT_USING_POSIX'], CPPPATH = CPPPATH)
 
 Return('group')
diff --git a/components/libc/posix/src/libc.c b/components/libc/posix/src/libc.c
new file mode 100644
index 0000000000..068719d5d6
--- /dev/null
+++ b/components/libc/posix/src/libc.c
@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/10/15     bernard      the first version
+ */
+#include <rtthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/time.h>
+#include "libc.h"
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef RT_USING_PTHREADS
+#include <pthread.h>
+#endif
+
+int libc_system_init(void)
+{
+#ifdef RT_USING_POSIX
+    rt_device_t dev_console;
+
+    dev_console = rt_console_get_device();
+    if (dev_console)
+    {
+        libc_stdio_set_console(dev_console->parent.name, O_RDWR);
+    }
+#endif /* RT_USING_POSIX */
+
+#if defined RT_USING_PTHREADS && !defined RT_USING_COMPONENTS_INIT
+    pthread_system_init();
+#endif
+
+    return 0;
+}
+INIT_COMPONENT_EXPORT(libc_system_init);
+
+#ifdef RT_USING_POSIX
+
+#if defined(RT_USING_LIBC) && defined(RT_USING_NEWLIB)
+#define STDIO_DEVICE_NAME_MAX   32
+static FILE* std_console = NULL;
+int libc_stdio_set_console(const char* device_name, int mode)
+{
+    FILE *fp;
+    char name[STDIO_DEVICE_NAME_MAX];
+    char *file_mode;
+
+    snprintf(name, sizeof(name) - 1, "/dev/%s", device_name);
+    name[STDIO_DEVICE_NAME_MAX - 1] = '\0';
+
+    if (mode == O_RDWR)
+    {
+        file_mode = "r+";
+    }
+    else if (mode == O_WRONLY)
+    {
+        file_mode = "wb";
+    }
+    else
+    {
+        file_mode = "rb";
+    }
+
+    fp = fopen(name, file_mode);
+    if (fp)
+    {
+        setvbuf(fp, NULL, _IONBF, 0);
+
+        if (std_console)
+        {
+            fclose(std_console);
+            std_console = NULL;
+        }
+        std_console = fp;
+
+        if (mode == O_RDWR)
+        {
+            _GLOBAL_REENT->_stdin  = std_console;
+        }
+        else
+        {
+            _GLOBAL_REENT->_stdin  = NULL;
+        }
+
+        if (mode == O_RDONLY)
+        {
+            _GLOBAL_REENT->_stdout = NULL;
+            _GLOBAL_REENT->_stderr = NULL;
+        }
+        else
+        {
+            _GLOBAL_REENT->_stdout = std_console;
+            _GLOBAL_REENT->_stderr = std_console;
+        }
+
+        _GLOBAL_REENT->__sdidinit = 1;
+    }
+
+    if (std_console)
+        return fileno(std_console);
+
+    return -1;
+}
+
+int libc_stdio_get_console(void)
+{
+    if (std_console)
+        return fileno(std_console);
+    else
+        return -1;
+}
+
+#else
+#define STDIO_DEVICE_NAME_MAX   32
+static int std_fd = -1;
+int libc_stdio_set_console(const char* device_name, int mode)
+{
+    int fd;
+    char name[STDIO_DEVICE_NAME_MAX];
+
+    snprintf(name, sizeof(name) - 1, "/dev/%s", device_name);
+    name[STDIO_DEVICE_NAME_MAX - 1] = '\0';
+
+    fd = open(name, mode, 0);
+    if (fd >= 0)
+    {
+        if (std_fd >= 0)
+        {
+            close(std_fd);
+        }
+        std_fd = fd;
+    }
+
+    return std_fd;
+}
+
+int libc_stdio_get_console(void) {
+    return std_fd;
+}
+#endif /* defined(RT_USING_LIBC) && defined(RT_USING_NEWLIB) */
+#endif /* RT_USING_POSIX */
diff --git a/components/libc/compilers/dlib/libc.h b/components/libc/posix/src/libc.h
index 9643c1161f..f81380bf78 100644
--- a/components/libc/compilers/dlib/libc.h
+++ b/components/libc/posix/src/libc.h
@@ -7,17 +7,20 @@
  * Date           Author       Notes
  * 2017/10/15     bernard      the first version
  */
-
 #ifndef __RTT_LIBC_H__
 #define __RTT_LIBC_H__
 
+#include <rtconfig.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 int libc_system_init(void);
+#ifdef RT_USING_POSIX
 int libc_stdio_get_console(void);
 int libc_stdio_set_console(const char* device_name, int mode);
+#endif /* RT_USING_POSIX */
 
 #ifdef __cplusplus
 }