[libc] Update libc.

1. Add POSIX termios implementation;
2. Add POSIX signals implementation;
3. Add stdio for each libc.

36 files changed, 1400 insertions, 339 deletions

diff --git a/components/libc/compilers/armlibc/libc.c b/components/libc/compilers/armlibc/libc.c
new file mode 100644
index 0000000000..d3a4ad06d0
--- /dev/null
+++ b/components/libc/compilers/armlibc/libc.c
@@ -0,0 +1,59 @@
+/*
+ * File     : libc.c
+ * Brief    : armcc libc initialization
+ *
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/10/15     bernard      the first version
+ */
+#include <stdio.h>
+#include <stdlib.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_STDIN)
+        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
new file mode 100644
index 0000000000..5e9f68218d
--- /dev/null
+++ b/components/libc/compilers/armlibc/libc.h
@@ -0,0 +1,37 @@
+/*
+ * File     : libc.h
+ * Brief    : armcc libc header file
+ *
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/10/15     bernard      the first version
+ */
+#ifndef __RTT_LIBC_H__
+#define __RTT_LIBC_H__
+
+#include <stddef.h>
+
+int libc_system_init(void);
+
+int libc_stdio_set_console(const char* device_name, int mode);
+int libc_stdio_read (void *buffer, size_t size);
+int libc_stdio_write(void *buffer, size_t size);
+
+#endif
diff --git a/components/libc/compilers/armlibc/mem_std.c b/components/libc/compilers/armlibc/mem_std.c
index 56aa525df2..5da5bb6c6c 100644
--- a/components/libc/compilers/armlibc/mem_std.c
+++ b/components/libc/compilers/armlibc/mem_std.c
@@ -32,7 +32,7 @@ RTM_EXPORT(realloc);
 
 void *calloc(rt_size_t nelem, rt_size_t elsize)
 {
-	return rt_calloc(nelem, elsize);
+    return rt_calloc(nelem, elsize);
 }
 RTM_EXPORT(calloc);
 
diff --git a/components/libc/compilers/armlibc/stdio.c b/components/libc/compilers/armlibc/stdio.c
new file mode 100644
index 0000000000..8c9c99b3ad
--- /dev/null
+++ b/components/libc/compilers/armlibc/stdio.c
@@ -0,0 +1,70 @@
+/*
+ * File     : stdio.c
+ * Brief    : stdio/console
+ *
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * 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_read(void *buffer, size_t size)
+{
+    return read(std_fd, buffer, size);
+}
+
+int libc_stdio_write(void *buffer, size_t size)
+{
+    return write(std_fd, buffer, size);
+}
+#endif
diff --git a/components/libc/compilers/armlibc/stubs.c b/components/libc/compilers/armlibc/stubs.c
index 395e51ecda..0de8aacb3c 100644
--- a/components/libc/compilers/armlibc/stubs.c
+++ b/components/libc/compilers/armlibc/stubs.c
@@ -2,12 +2,22 @@
  * File     : stubs.c
  * Brief    : reimplement some basic functions of arm standard c library
  *
- * This file is part of Device File System in RT-Thread RTOS
- * COPYRIGHT (C) 2004-2012, RT-Thread Development Team
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
  *
- * The license and distribution terms for this file may be
- * found in the file LICENSE in this distribution or at
- * http://www.rt-thread.org/license/LICENSE.
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Change Logs:
  * Date           Author       Notes
@@ -28,10 +38,10 @@
 
 #pragma import(__use_no_semihosting_swi)
 
-/* TODO: Standard IO device handles. */
-#define STDIN       1
-#define STDOUT      2
-#define STDERR      3
+/* Standard IO device handles. */
+#define STDIN       0
+#define STDOUT      1
+#define STDERR      2
 
 /* Standard IO device name defines. */
 const char __stdin_name[]  = "STDIN";
@@ -94,7 +104,7 @@ FILEHANDLE _sys_open(const char *name, int openmode)
     if (fd < 0)
         return -1;
     else
-        return fd + STDERR + 1;
+        return fd;
 #endif
 }
 
@@ -103,21 +113,36 @@ int _sys_close(FILEHANDLE fh)
 #ifndef RT_USING_DFS
     return 0;
 #else
-    if (fh < STDERR)
-        return 0;
+    if (fh <= STDERR) return 0;
 
-    return close(fh - STDERR - 1);
+    return close(fh);
 #endif
 }
 
-/**
- * read data
+/*
+ * Read from a file. Can return:
+ *  - zero if the read was completely successful
+ *  - the number of bytes _not_ read, if the read was partially successful
+ *  - the number of bytes not read, plus the top bit set (0x80000000), if
+ *    the read was partially successful due to end of file
+ *  - -1 if some error other than EOF occurred
  *
- * @param fh - file handle
- * @param buf - buffer to save read data
- * @param len - max length of data buffer
- * @param mode - useless, for historical reasons
- * @return The number of bytes not read.
+ * It is also legal to signal EOF by returning no data but
+ * signalling no error (i.e. the top-bit-set mechanism need never
+ * be used).
+ *
+ * So if (for example) the user is trying to read 8 bytes at a time
+ * from a file in which only 5 remain, this routine can do three
+ * equally valid things:
+ *
+ *  - it can return 0x80000003 (3 bytes not read due to EOF)
+ *  - OR it can return 3 (3 bytes not read), and then return
+ *    0x80000008 (8 bytes not read due to EOF) on the next attempt
+ *  - OR it can return 3 (3 bytes not read), and then return
+ *    8 (8 bytes not read, meaning 0 read, meaning EOF) on the next
+ *    attempt
+ *
+ * `mode' exists for historical reasons and must be ignored.
  */
 int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
 {
@@ -127,8 +152,13 @@ int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
 
     if (fh == STDIN)
     {
-        /* TODO */
-        return 0;
+#ifdef RT_USING_POSIX_STDIN
+        size = libc_stdio_read(buf, len);
+        return len - size;
+#else
+        /* no stdin */
+        return -1;
+#endif
     }
 
     if ((fh == STDOUT) || (fh == STDERR))
@@ -137,7 +167,7 @@ int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
 #ifndef RT_USING_DFS
     return 0;
 #else
-    size = read(fh - STDERR - 1, buf, len);
+    size = read(fh, buf, len);
     if (size >= 0)
         return len - size;
     else
@@ -145,14 +175,10 @@ int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
 #endif
 }
 
-/**
- * write data
- *
- * @param fh - file handle
- * @param buf - data buffer
- * @param len - buffer length
- * @param mode - useless, for historical reasons
- * @return a positive number representing the number of characters not written.
+/*
+ * Write to a file. Returns 0 on success, negative on error, and
+ * the number of characters _not_ written on partial success.
+ * `mode' exists for historical reasons and must be ignored.
  */
 int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
 {
@@ -165,22 +191,27 @@ int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
 #ifndef RT_USING_CONSOLE
         return 0;
 #else
-        rt_device_t console_device;
-
-        console_device = rt_console_get_device();
-        if (console_device != 0) rt_device_write(console_device, 0, buf, len);
+#ifdef RT_USING_POSIX_STDIN
+        size = libc_stdio_write(buf, len);
+        return len - size;
+#else
+        if (rt_console_get_device())
+        {
+            rt_device_write(rt_console_get_device(), -1, buf, len);
+            return 0;
+        }
 
-        return 0;
+        return -1;
+#endif
 #endif
     }
 
-    if (fh == STDIN)
-        return -1;
+    if (fh == STDIN) return -1;
 
 #ifndef RT_USING_DFS
     return 0;
 #else
-    size = write(fh - STDERR - 1, buf, len);
+    size = write(fh, buf, len);
     if (size >= 0)
         return len - size;
     else
@@ -188,11 +219,9 @@ int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
 #endif
 }
 
-/**
- * put he file pointer at offset pos from the beginning of the file.
- *
- * @param pos - offset
- * @return the current file position, or -1 on failed
+/*
+ * Move the file position to a given offset from the file start.
+ * Returns >=0 on success, <0 on failure.
  */
 int _sys_seek(FILEHANDLE fh, long pos)
 {
@@ -204,7 +233,7 @@ int _sys_seek(FILEHANDLE fh, long pos)
 #else
 
     /* position is relative to the start of file fh */
-    return lseek(fh - STDERR - 1, pos, 0);
+    return lseek(fh, pos, 0);
 #endif
 }
 
@@ -285,7 +314,15 @@ int fputc(int c, FILE *f)
     return 1;
 }
 
-int fgetc(FILE *f) {
-  return -1;
+int fgetc(FILE *f) 
+{
+    char ch;
+
+#ifdef RT_USING_POSIX_STDIN
+    if (libc_stdio_read(&ch, 1) == 1)
+        return ch;
+#endif
+
+    return -1;
 }
 #endif
diff --git a/components/libc/compilers/armlibc/sys/errno.h b/components/libc/compilers/armlibc/sys/errno.h
index 0aba5f5e19..8ee115ed04 100644
--- a/components/libc/compilers/armlibc/sys/errno.h
+++ b/components/libc/compilers/armlibc/sys/errno.h
@@ -1,80 +1,6 @@
 #ifndef SYS_ERRNO_H__
 #define SYS_ERRNO_H__
 
-#ifdef RT_USING_DFS
-
-#include <dfs_def.h>
-
-/* using device error codes */
-#define ENOENT          DFS_STATUS_ENOENT
-#define EIO             DFS_STATUS_EIO
-#define ENXIO           DFS_STATUS_ENXIO
-#define EBADF           DFS_STATUS_EBADF
-#define EAGAIN          DFS_STATUS_EAGAIN
-#define ENOMEM          DFS_STATUS_ENOMEM
-#define EBUSY           DFS_STATUS_EBUSY
-#define EEXIST          DFS_STATUS_EEXIST
-#define EXDEV           DFS_STATUS_EXDEV
-#define ENODEV          DFS_STATUS_ENODEV
-#define ENOTDIR         DFS_STATUS_ENOTDIR
-#define EISDIR          DFS_STATUS_EISDIR
-#define EINVAL          DFS_STATUS_EINVAL
-#define ENOSPC          DFS_STATUS_ENOSPC
-#define EROFS           DFS_STATUS_EROFS
-#define ENOSYS          DFS_STATUS_ENOSYS
-#define ENOTEMPTY       DFS_STATUS_ENOTEMPTY
-
-#else
-
-/* error codes */
-#define ENOENT          2        /* No such file or directory */
-#define EIO             5        /* I/O error */
-#define ENXIO           6        /* No such device or address */
-#define EBADF           9        /* Bad file number */
-#define EAGAIN          11       /* Try again */
-#define ENOMEM          12       /* no memory */
-#define EBUSY           16       /* Device or resource busy */
-#define EEXIST          17       /* File exists */
-#define EXDEV           18       /* Cross-device link */
-#define ENODEV          19       /* No such device */
-#define ENOTDIR         20       /* Not a directory */
-#define EISDIR          21       /* Is a directory */
-#define EINVAL          22       /* Invalid argument */
-#define ENOSPC          28       /* No space left on device */
-#define EROFS           30       /* Read-only file system */
-#define ENOSYS          38       /* Function not implemented */
-#define ENOTEMPTY       39       /* Directory not empty */
-
-#endif
-
-#define EPERM           1        /* Not super-user */
-#define ESRCH           3        /* No such process */
-#define EINTR           4        /* Interrupted system call */
-#define EACCES          13       /* Permission denied */
-#define EFAULT          14       /* Bad address */
-#define ENFILE          23       /* Too many open files in system */
-#define ERANGE          34       /* Math result not representable */
-#define EDEADLK         45       /* Deadlock condition */
-#define EBADMSG         77       /* Trying to read unreadable message */
-#define EMSGSIZE        90       /* Message too long */
-#define ENOPROTOOPT     92       /* Protocol not available */
-#define EOPNOTSUPP      95       /* Operation not supported on transport endpoint */
-#define EAFNOSUPPORT    97       /* Address family not supported by protocol */
-#define EADDRINUSE      98       /* Address already in use */
-#define EADDRNOTAVAIL   99       /* Cannot assign requested address */
-#define ENETDOWN        100      /* Network is down */
-#define ENETUNREACH     101      /* Network is unreachable */
-#define ECONNABORTED    103      /* Software caused connection abort */
-#define ECONNRESET      104      /* Connection reset by peer */
-#define ENOBUFS         105      /* No buffer space available */
-#define EISCONN         106      /* Transport endpoint is already connected */
-#define ENOTCONN        107      /* Transport endpoint is not connected */
-#define EINPROGRESS     115      /* Operation now in progress */
-#define ETIMEDOUT       116      /* Connection timed out */
-#define EHOSTUNREACH    113      /* No route to host */
-#define EALREADY        114      /* Operation already in progress */
-#define ENOTSUP         134      /* Not supported */
-#define ENSRNOTFOUND    163      /* Domain name not found */
-#define EWOULDBLOCK     EAGAIN   /* Operation would block */
+#include <rtthread.h>
 
 #endif
diff --git a/components/libc/compilers/armlibc/sys/unistd.h b/components/libc/compilers/armlibc/sys/unistd.h
index e1e0dc904c..38ba8b5072 100644
--- a/components/libc/compilers/armlibc/sys/unistd.h
+++ b/components/libc/compilers/armlibc/sys/unistd.h
@@ -6,31 +6,31 @@
 #ifdef RT_USING_DFS
 #include <dfs_posix.h>
 #else
-#define	_FREAD		0x0001	/* read enabled */
-#define	_FWRITE		0x0002	/* write enabled */
-#define	_FAPPEND	0x0008	/* append (writes guaranteed at the end) */
-#define	_FMARK		0x0010	/* internal; mark during gc() */
-#define	_FDEFER		0x0020	/* internal; defer for next gc pass */
-#define	_FASYNC		0x0040	/* signal pgrp when data ready */
-#define	_FSHLOCK	0x0080	/* BSD flock() shared lock present */
-#define	_FEXLOCK	0x0100	/* BSD flock() exclusive lock present */
-#define	_FCREAT		0x0200	/* open with file create */
-#define	_FTRUNC		0x0400	/* open with truncation */
-#define	_FEXCL		0x0800	/* error on open if file exists */
-#define	_FNBIO		0x1000	/* non blocking I/O (sys5 style) */
-#define	_FSYNC		0x2000	/* do all writes synchronously */
-#define	_FNONBLOCK	0x4000	/* non blocking I/O (POSIX style) */
-#define	_FNDELAY	_FNONBLOCK	/* non blocking I/O (4.2 style) */
-#define	_FNOCTTY	0x8000	/* don't assign a ctty on this open */
+#define _FREAD      0x0001  /* read enabled */
+#define _FWRITE     0x0002  /* write enabled */
+#define _FAPPEND    0x0008  /* append (writes guaranteed at the end) */
+#define _FMARK      0x0010  /* internal; mark during gc() */
+#define _FDEFER     0x0020  /* internal; defer for next gc pass */
+#define _FASYNC     0x0040  /* signal pgrp when data ready */
+#define _FSHLOCK    0x0080  /* BSD flock() shared lock present */
+#define _FEXLOCK    0x0100  /* BSD flock() exclusive lock present */
+#define _FCREAT     0x0200  /* open with file create */
+#define _FTRUNC     0x0400  /* open with truncation */
+#define _FEXCL      0x0800  /* error on open if file exists */
+#define _FNBIO      0x1000  /* non blocking I/O (sys5 style) */
+#define _FSYNC      0x2000  /* do all writes synchronously */
+#define _FNONBLOCK  0x4000  /* non blocking I/O (POSIX style) */
+#define _FNDELAY    _FNONBLOCK  /* non blocking I/O (4.2 style) */
+#define _FNOCTTY    0x8000  /* don't assign a ctty on this open */
 
-#define	O_RDONLY	0		/* +1 == FREAD */
-#define	O_WRONLY	1		/* +1 == FWRITE */
-#define	O_RDWR		2		/* +1 == FREAD|FWRITE */
-#define	O_APPEND	_FAPPEND
-#define	O_CREAT		_FCREAT
-#define	O_TRUNC		_FTRUNC
-#define	O_EXCL		_FEXCL
-#define O_SYNC		_FSYNC
+#define O_RDONLY    0       /* +1 == FREAD */
+#define O_WRONLY    1       /* +1 == FWRITE */
+#define O_RDWR      2       /* +1 == FREAD|FWRITE */
+#define O_APPEND    _FAPPEND
+#define O_CREAT     _FCREAT
+#define O_TRUNC     _FTRUNC
+#define O_EXCL      _FEXCL
+#define O_SYNC      _FSYNC
 #endif
 
 #endif /* _SYS_UNISTD_H */
diff --git a/components/libc/compilers/dlib/libc.c b/components/libc/compilers/dlib/libc.c
new file mode 100644
index 0000000000..ba998e9747
--- /dev/null
+++ b/components/libc/compilers/dlib/libc.c
@@ -0,0 +1,59 @@
+/*
+ * File     : libc.c
+ * Brief    : iar dlib initialization
+ *
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/10/15     bernard      the first version
+ */
+#include <stdio.h>
+#include <stdlib.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_STDIN)
+        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/libc.h b/components/libc/compilers/dlib/libc.h
new file mode 100644
index 0000000000..db571d2ee1
--- /dev/null
+++ b/components/libc/compilers/dlib/libc.h
@@ -0,0 +1,38 @@
+/*
+ * File     : libc.h
+ * Brief    : iar dlib header file
+ *
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/10/15     bernard      the first version
+ */
+
+#ifndef __RTT_LIBC_H__
+#define __RTT_LIBC_H__
+
+#include <stddef.h>
+
+int libc_system_init(void);
+
+int libc_stdio_set_console(const char* device_name, int mode);
+int libc_stdio_read (void *buffer, size_t size);
+int libc_stdio_write(const void *buffer, size_t size);
+
+#endif
diff --git a/components/libc/compilers/dlib/stdio.c b/components/libc/compilers/dlib/stdio.c
new file mode 100644
index 0000000000..24e421f2b3
--- /dev/null
+++ b/components/libc/compilers/dlib/stdio.c
@@ -0,0 +1,70 @@
+/*
+ * File     : stdio.c
+ * Brief    : stdio/console
+ *
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * 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_read(void *buffer, size_t size)
+{
+    return read(std_fd, buffer, size);
+}
+
+int libc_stdio_write(const void *buffer, size_t size)
+{
+    return write(std_fd, buffer, size);
+}
+#endif
diff --git a/components/libc/compilers/dlib/sys/errno.h b/components/libc/compilers/dlib/sys/errno.h
index a8e09ffd24..072892edc1 100644
--- a/components/libc/compilers/dlib/sys/errno.h
+++ b/components/libc/compilers/dlib/sys/errno.h
@@ -1,80 +1,7 @@
 #ifndef SYS_ERRNO_H__
 #define SYS_ERRNO_H__
 
-#ifdef RT_USING_DFS
+#include <rtthread.h>
 
-#include <dfs_def.h>
-
-/* using device error codes */
-#define ENOENT       DFS_STATUS_ENOENT
-#define EIO          DFS_STATUS_EIO
-#define ENXIO        DFS_STATUS_ENXIO
-#define EBADF        DFS_STATUS_EBADF
-#define EAGAIN       DFS_STATUS_EAGAIN
-#define ENOMEM       DFS_STATUS_ENOMEM
-#define EBUSY        DFS_STATUS_EBUSY
-#define EEXIST       DFS_STATUS_EEXIST
-#define EXDEV        DFS_STATUS_EXDEV
-#define ENODEV       DFS_STATUS_ENODEV
-#define ENOTDIR      DFS_STATUS_ENOTDIR
-#define EISDIR       DFS_STATUS_EISDIR
-#define EINVAL       DFS_STATUS_EINVAL
-#define ENOSPC       DFS_STATUS_ENOSPC
-#define EROFS        DFS_STATUS_EROFS
-#define ENOSYS       DFS_STATUS_ENOSYS
-#define ENOTEMPTY    DFS_STATUS_ENOTEMPTY
-
-#else
-
-/* error codes */
-#define ENOENT       2        /* No such file or directory */
-#define EIO          5        /* I/O error */
-#define ENXIO        6        /* No such device or address */
-#define EBADF        9        /* Bad file number */
-#define EAGAIN       11       /* Try again */
-#define ENOMEM       12       /* no memory */
-#define EBUSY        16       /* Device or resource busy */
-#define EEXIST       17       /* File exists */
-#define EXDEV        18       /* Cross-device link */
-#define ENODEV       19       /* No such device */
-#define ENOTDIR      20       /* Not a directory */
-#define EISDIR       21       /* Is a directory */
-#define EINVAL       22       /* Invalid argument */
-#define ENOSPC       28       /* No space left on device */
-#define EROFS        30       /* Read-only file system */
-#define ENOSYS       38       /* Function not implemented */
-#define ENOTEMPTY    39       /* Directory not empty */
-
-#endif
-
-#define EPERM                1        /* Not super-user */
-#define ESRCH                3        /* No such process */
-#define EINTR                4        /* Interrupted system call */
-#define EACCES               13       /* Permission denied */
-#define EFAULT               14       /* Bad address */
-#define ENFILE               23       /* Too many open files in system */
-#define ERANGE               34       /* Math result not representable */
-#define EDEADLK              45       /* Deadlock condition */
-#define EBADMSG              77       /* Trying to read unreadable message */
-#define EMSGSIZE             90       /* Message too long */
-#define ENOPROTOOPT          92       /* Protocol not available */
-#define EOPNOTSUPP           95       /* Operation not supported on transport endpoint */
-#define EAFNOSUPPORT         97       /* Address family not supported by protocol */
-#define EADDRINUSE           98       /* Address already in use */
-#define EADDRNOTAVAIL        99       /* Cannot assign requested address */
-#define ENETDOWN             100      /* Network is down */
-#define ENETUNREACH          101      /* Network is unreachable */
-#define ECONNABORTED         103      /* Software caused connection abort */
-#define ECONNRESET           104      /* Connection reset by peer */
-#define ENOBUFS              105      /* No buffer space available */
-#define EISCONN              106      /* Transport endpoint is already connected */
-#define ENOTCONN             107      /* Transport endpoint is not connected */
-#define EINPROGRESS          115      /* Operation now in progress */
-#define ETIMEDOUT            116      /* Connection timed out */
-#define EHOSTUNREACH         113      /* No route to host */
-#define EALREADY             114      /* Operation already in progress */
-#define ENOTSUP              134      /* Not supported */
-#define ENSRNOTFOUND         163      /* Domain name not found */
-#define EWOULDBLOCK          EAGAIN   /* Operation would block */
 
 #endif
diff --git a/components/libc/compilers/dlib/syscall_close.c b/components/libc/compilers/dlib/syscall_close.c
index c2bb0b63d6..5792bb3806 100644
--- a/components/libc/compilers/dlib/syscall_close.c
+++ b/components/libc/compilers/dlib/syscall_close.c
@@ -36,7 +36,7 @@ int __close(int handle)
         return _LLIO_ERROR;
 
 #ifdef RT_USING_DFS
-    return close(handle - _LLIO_STDERR - 1);
+    return close(handle);
 #else
     return 0;
 #endif
diff --git a/components/libc/compilers/dlib/syscall_lseek.c b/components/libc/compilers/dlib/syscall_lseek.c
index 23d509817e..950ba52f65 100644
--- a/components/libc/compilers/dlib/syscall_lseek.c
+++ b/components/libc/compilers/dlib/syscall_lseek.c
@@ -36,7 +36,7 @@ long __lseek(int handle, long offset, int whence)
         return _LLIO_ERROR;
 
 #ifdef RT_USING_DFS
-    return lseek(handle - _LLIO_STDERR - 1, offset, whence);
+    return lseek(handle, offset, whence);
 #else
     return _LLIO_ERROR;
 #endif
diff --git a/components/libc/compilers/dlib/syscall_mem.c b/components/libc/compilers/dlib/syscall_mem.c
index 10eb298b9c..05e79f50b2 100644
--- a/components/libc/compilers/dlib/syscall_mem.c
+++ b/components/libc/compilers/dlib/syscall_mem.c
@@ -35,7 +35,7 @@ void *realloc(void *rmem, rt_size_t newsize)
 
 void *calloc(rt_size_t nelem, rt_size_t elsize)
 {
-	return rt_calloc(nelem, elsize);
+    return rt_calloc(nelem, elsize);
 }
 
 void free(void *rmem)
diff --git a/components/libc/compilers/dlib/syscall_open.c b/components/libc/compilers/dlib/syscall_open.c
index 95fa43b9c6..6194707549 100644
--- a/components/libc/compilers/dlib/syscall_open.c
+++ b/components/libc/compilers/dlib/syscall_open.c
@@ -33,56 +33,56 @@
 int __open(const char *filename, int mode)
 {
 #ifndef RT_USING_DFS
-  return -1;
+  return _LLIO_ERROR;
 #else
   int handle;
   int open_mode = O_RDONLY;
-  
+
   if (mode & _LLIO_CREAT)
   {
     open_mode |= O_CREAT;
-    
+
     /* Check what we should do with it if it exists. */
     if (mode & _LLIO_APPEND)
     {
       /* Append to the existing file. */
       open_mode |= O_APPEND;
     }
-    
+
     if (mode & _LLIO_TRUNC)
     {
       /* Truncate the existsing file. */
       open_mode |= O_TRUNC;
     }
   }
-  
+
   if (mode & _LLIO_TEXT)
   {
     /* we didn't support text mode */
   }
-  
+
   switch (mode & _LLIO_RDWRMASK)
   {
   case _LLIO_RDONLY:
     break;
-    
+
   case _LLIO_WRONLY:
     open_mode |= O_WRONLY;
     break;
-    
+
   case _LLIO_RDWR:
     /* The file should be opened for both reads and writes. */
     open_mode |= O_RDWR;
     break;
-    
+
   default:
-    return -1;
+    return _LLIO_ERROR;
   }
-  
+
   handle = open(filename, open_mode, 0);
   if (handle < 0)
-    return -1;
-  
-  return handle + _LLIO_STDERR + 1;
+    return _LLIO_ERROR;
+
+  return handle;
 #endif
 }
diff --git a/components/libc/compilers/dlib/syscall_read.c b/components/libc/compilers/dlib/syscall_read.c
index aa13654189..9dcaa9df65 100644
--- a/components/libc/compilers/dlib/syscall_read.c
+++ b/components/libc/compilers/dlib/syscall_read.c
@@ -27,6 +27,7 @@
 #include <dfs_posix.h>
 #endif
 #include <yfuns.h>
+#include "libc.h"
 
 #pragma module_name = "?__read"
 size_t __read(int handle, unsigned char *buf, size_t len)
@@ -37,8 +38,11 @@ size_t __read(int handle, unsigned char *buf, size_t len)
 
     if (handle == _LLIO_STDIN)
     {
-        /* TODO */
-        return 0;
+#ifdef RT_USING_POSIX_STDIN
+        return libc_stdio_read(buf, len);
+#else
+        return _LLIO_ERROR;
+#endif
     }
 
     if ((handle == _LLIO_STDOUT) || (handle == _LLIO_STDERR))
@@ -47,7 +51,7 @@ size_t __read(int handle, unsigned char *buf, size_t len)
 #ifndef RT_USING_DFS
     return _LLIO_ERROR;
 #else
-    size = read(handle - _LLIO_STDERR - 1, buf, len);
+    size = read(handle, buf, len);
     return size;
 #endif
 }
diff --git a/components/libc/compilers/dlib/syscall_write.c b/components/libc/compilers/dlib/syscall_write.c
index a7140b9818..e2cb04000b 100644
--- a/components/libc/compilers/dlib/syscall_write.c
+++ b/components/libc/compilers/dlib/syscall_write.c
@@ -27,6 +27,7 @@
 #include <dfs_posix.h>
 #endif
 #include <yfuns.h>
+#include "libc.h"
 
 #pragma module_name = "?__write"
 
@@ -41,6 +42,10 @@ size_t __write(int handle, const unsigned char *buf, size_t len)
 #ifndef RT_USING_CONSOLE
         return _LLIO_ERROR;
 #else
+
+#ifdef RT_USING_POSIX_STDIN
+        return libc_stdio_write((void*)buf, len);
+#else
         rt_device_t console_device;
 
         console_device = rt_console_get_device();
@@ -48,14 +53,15 @@ size_t __write(int handle, const unsigned char *buf, size_t len)
 
         return len;
 #endif
+#endif
     }
 
-    if (handle == _LLIO_STDIN) return -1;
+    if (handle == _LLIO_STDIN) return _LLIO_ERROR;
 
 #ifndef RT_USING_DFS
     return _LLIO_ERROR;
 #else
-    size = write(handle - _LLIO_STDERR - 1, buf, len);
+    size = write(handle, buf, len);
     return size;
 #endif
 }
diff --git a/components/libc/compilers/dlib/unistd.h b/components/libc/compilers/dlib/unistd.h
new file mode 100644
index 0000000000..d67f8fb6f2
--- /dev/null
+++ b/components/libc/compilers/dlib/unistd.h
@@ -0,0 +1,6 @@
+#ifndef _UNISTD_H_
+#define _UNISTD_H_
+
+# include "sys/unistd.h"
+
+#endif /* _UNISTD_H_ */
diff --git a/components/libc/compilers/newlib/libc.c b/components/libc/compilers/newlib/libc.c
index 8f97e1c8b4..c06ded705e 100644
--- a/components/libc/compilers/newlib/libc.c
+++ b/components/libc/compilers/newlib/libc.c
@@ -1,52 +1,60 @@
+/*
+ * File     : libc.c
+ * Brief    : gcc libc header file
+ *
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * 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
 
-#ifdef RT_USING_DFS
-#include <dfs_posix.h>
-
-#ifdef RT_USING_DFS_DEVFS
-#include <devfs.h>
-#endif
-
-#endif
-
 int libc_system_init(void)
 {
 #ifdef RT_USING_DFS
-    int fd;
-    struct rt_device *console_dev;
-
-#ifndef RT_USING_DFS_DEVFS
-#error Please enable devfs by defining RT_USING_DFS_DEVFS in rtconfig.h
-#endif
+    rt_device_t dev_console;
 
-    console_dev = rt_console_get_device();
-    if (console_dev)
+    dev_console = rt_console_get_device();
+    if (dev_console)
     {
-        /* initialize console device */
-        rt_console_init(console_dev->parent.name);
-
-        /* open console as stdin/stdout/stderr */
-        fd = open("/dev/console", O_RDONLY, 0); /* for stdin */
-        fd = open("/dev/console", O_WRONLY, 0); /* for stdout */
-        fd = open("/dev/console", O_WRONLY, 0); /* for stderr */
-
-        /* skip warning */
-        fd = fd;
+    #if defined(RT_USING_DFS_DEVFS) && defined(RT_USING_POSIX_STDIN)
+        libc_stdio_set_console(dev_console->parent.name, O_RDWR);
+    #else
+        libc_stdio_set_console(dev_console->parent.name, O_WRONLY);
+    #endif
     }
 #endif
 
     /* set PATH and HOME */
     putenv("PATH=/bin");
     putenv("HOME=/home");
+
 #if defined RT_USING_PTHREADS && !defined RT_USING_COMPONENTS_INIT
     pthread_system_init();
 #endif
diff --git a/components/libc/compilers/newlib/libc.h b/components/libc/compilers/newlib/libc.h
index a4f342df33..7cab52a11f 100644
--- a/components/libc/compilers/newlib/libc.h
+++ b/components/libc/compilers/newlib/libc.h
@@ -1,3 +1,28 @@
+/*
+ * File     : libc.h
+ * Brief    : gcc libc header file
+ *
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/10/15     bernard      the first version
+ */
 #ifndef __RTT_LIBC_H__
 #define __RTT_LIBC_H__
 
@@ -12,6 +37,7 @@
 #define NANOSECOND_PER_TICK     (NANOSECOND_PER_SECOND  / RT_TICK_PER_SECOND)
 
 int libc_system_init(void);
+int libc_stdio_set_console(const char* device_name, int mode);
 
 /* some time related function */
 int libc_set_time(const struct timespec *time);
diff --git a/components/libc/compilers/newlib/libc_sym.c b/components/libc/compilers/newlib/libc_sym.c
deleted file mode 100644
index 48e488f5d8..0000000000
--- a/components/libc/compilers/newlib/libc_sym.c
+++ /dev/null
@@ -1,47 +0,0 @@
-#include <rtthread.h>
-#include <rtm.h>
-
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-RTM_EXPORT(strcpy);
-RTM_EXPORT(strncpy);
-RTM_EXPORT(strlen);
-RTM_EXPORT(strcat);
-RTM_EXPORT(strstr);
-RTM_EXPORT(strchr);
-RTM_EXPORT(strcmp);
-RTM_EXPORT(strtol);
-RTM_EXPORT(strtoul);
-RTM_EXPORT(strncmp);
-
-RTM_EXPORT(memcpy);
-RTM_EXPORT(memcmp);
-RTM_EXPORT(memmove);
-RTM_EXPORT(memset);
-RTM_EXPORT(memchr);
-
-RTM_EXPORT(putchar);
-RTM_EXPORT(puts);
-RTM_EXPORT(printf);
-RTM_EXPORT(sprintf);
-RTM_EXPORT(snprintf);
-
-RTM_EXPORT(fwrite);
-
-#include <time.h>
-RTM_EXPORT(localtime);
-RTM_EXPORT(time);
-
-#include <setjmp.h>
-RTM_EXPORT(longjmp);
-RTM_EXPORT(setjmp);
-
-RTM_EXPORT(exit);
-RTM_EXPORT(abort);
-
-RTM_EXPORT(rand);
-
-#include <assert.h>
-RTM_EXPORT(__assert_func);
diff --git a/components/libc/compilers/newlib/libc_syms.c b/components/libc/compilers/newlib/libc_syms.c
new file mode 100644
index 0000000000..ed8686e5dd
--- /dev/null
+++ b/components/libc/compilers/newlib/libc_syms.c
@@ -0,0 +1,72 @@
+/*
+ * File     : libc_syms.c
+ * Brief    : exported symbols for libc.
+ *
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/10/15     bernard      the first version
+ */
+#include <rtthread.h>
+#include <rtm.h>
+
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+RTM_EXPORT(strcpy);
+RTM_EXPORT(strncpy);
+RTM_EXPORT(strlen);
+RTM_EXPORT(strcat);
+RTM_EXPORT(strstr);
+RTM_EXPORT(strchr);
+RTM_EXPORT(strcmp);
+RTM_EXPORT(strtol);
+RTM_EXPORT(strtoul);
+RTM_EXPORT(strncmp);
+
+RTM_EXPORT(memcpy);
+RTM_EXPORT(memcmp);
+RTM_EXPORT(memmove);
+RTM_EXPORT(memset);
+RTM_EXPORT(memchr);
+
+RTM_EXPORT(putchar);
+RTM_EXPORT(puts);
+RTM_EXPORT(printf);
+RTM_EXPORT(sprintf);
+RTM_EXPORT(snprintf);
+
+RTM_EXPORT(fwrite);
+
+#include <time.h>
+RTM_EXPORT(localtime);
+RTM_EXPORT(time);
+
+#include <setjmp.h>
+RTM_EXPORT(longjmp);
+RTM_EXPORT(setjmp);
+
+RTM_EXPORT(exit);
+RTM_EXPORT(abort);
+
+RTM_EXPORT(rand);
+
+#include <assert.h>
+RTM_EXPORT(__assert_func);
diff --git a/components/libc/compilers/newlib/stdio.c b/components/libc/compilers/newlib/stdio.c
new file mode 100644
index 0000000000..276e68050c
--- /dev/null
+++ b/components/libc/compilers/newlib/stdio.c
@@ -0,0 +1,85 @@
+/*
+ * File     : stdio.c
+ * Brief    : stdio for newlib
+ *
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/10/15     bernard      the first version
+ */
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <rtthread.h>
+#include "libc.h"
+
+#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 if (mode == O_RDONLY) 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;
+    }
+
+    return fileno(std_console);
+}
diff --git a/components/libc/compilers/newlib/sys/fcntl.h b/components/libc/compilers/newlib/sys/fcntl.h
index a53ca808b2..499c67260e 100644
--- a/components/libc/compilers/newlib/sys/fcntl.h
+++ b/components/libc/compilers/newlib/sys/fcntl.h
@@ -13,6 +13,4 @@
 #define O_DIRECTORY     0x0200000
 #define O_BINARY        0x0008000
 
-#include <unistd.h>
-
 #endif
diff --git a/components/libc/compilers/newlib/sys/termios.h b/components/libc/compilers/newlib/sys/termios.h
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/components/libc/compilers/newlib/sys/termios.h
diff --git a/components/libc/compilers/newlib/syscalls.c b/components/libc/compilers/newlib/syscalls.c
index ff09a4fe80..52d2361a04 100644
--- a/components/libc/compilers/newlib/syscalls.c
+++ b/components/libc/compilers/newlib/syscalls.c
@@ -205,30 +205,23 @@ _wait_r(struct _reent *ptr, int *status)
 _ssize_t
 _write_r(struct _reent *ptr, int fd, const void *buf, size_t nbytes)
 {
-	if (fd < 3)
+#ifndef RT_USING_DFS
+	if (fd == 0)
 	{
-#ifdef RT_USING_CONSOLE
-		rt_device_t console_device;
-		extern rt_device_t rt_console_get_device(void);
+		rt_device_t console;
 
-		console_device = rt_console_get_device();
-		if (console_device != 0) rt_device_write(console_device, 0, buf, nbytes);
-		return nbytes;
-#else
-        return 0;
-#endif
+		console = rt_console_get_device();
+		if (console) return rt_device_write(console, -1, buf, nbytes);
 	}
-	else
-	{
-#ifdef RT_USING_DFS
-	    _ssize_t rc;
 
-	    rc = write(fd, buf, nbytes);
-	    return rc;
+    return 0;
+
 #else
-        return 0;
+	_ssize_t rc;
+
+	rc = write(fd, buf, nbytes);
+	return rc;
 #endif
-	}
 }
 #endif
 
diff --git a/components/libc/pthreads/pthread.c b/components/libc/pthreads/pthread.c
index eb7d582e59..f88dda9ab0 100644
--- a/components/libc/pthreads/pthread.c
+++ b/components/libc/pthreads/pthread.c
@@ -194,7 +194,7 @@ int pthread_detach(pthread_t thread)
 
     ptd = _pthread_get_data(thread);
 
-    if (thread->stat == RT_THREAD_CLOSE)
+    if ((thread->stat & RT_THREAD_STAT_MASK)== RT_THREAD_CLOSE)
     {
         /* delete joinable semaphore */
         if (ptd->joinable_sem != RT_NULL)
@@ -354,10 +354,21 @@ RTM_EXPORT(pthread_atfork);
 
 int pthread_kill(pthread_t thread, int sig)
 {
-    return EOPNOTSUPP;
+#ifdef RT_USING_SIGNALS
+    return rt_thread_kill(thread, sig);
+#else
+	return ENOSYS;
+#endif
 }
 RTM_EXPORT(pthread_kill);
 
+#ifdef RT_USING_SIGNALS
+int pthread_sigmask(int how, const sigset_t *set, sigset_t *oset)
+{
+	return sigprocmask(how, set, oset);
+}
+#endif
+
 void pthread_cleanup_pop(int execute)
 {
     _pthread_data_t *ptd;
diff --git a/components/libc/pthreads/pthread.h b/components/libc/pthreads/pthread.h
index 2674599aac..dd1c5b5bd2 100644
--- a/components/libc/pthreads/pthread.h
+++ b/components/libc/pthreads/pthread.h
@@ -268,11 +268,13 @@ int pthread_barrier_wait(pthread_barrier_t *barrier);
 /*  Signal Generation and Delivery, P1003.1b-1993, p. 63
     NOTE: P1003.1c/D10, p. 34 adds sigev_notify_function and
           sigev_notify_attributes to the sigevent structure.  */
+#if 0
 union sigval
 {
     int    sival_int;    /* Integer signal value */
     void  *sival_ptr;    /* Pointer signal value */
 };
+#endif
 
 struct sigevent
 {
diff --git a/components/libc/signal/SConscript b/components/libc/signal/SConscript
new file mode 100644
index 0000000000..f07ff58f6e
--- /dev/null
+++ b/components/libc/signal/SConscript
@@ -0,0 +1,13 @@
+# RT-Thread building script for component
+
+from building import *
+
+cwd = GetCurrentDir()
+src = Glob('*.c') + Glob('*.cpp')
+CPPPATH = [cwd]
+
+group = DefineGroup('libc', src, 
+    depend = ['RT_USING_SIGNALS', 'RT_USING_PTHREADS', 'RT_USING_LIBC'], 
+    CPPPATH = CPPPATH)
+
+Return('group')
diff --git a/components/libc/signal/posix_signal.c b/components/libc/signal/posix_signal.c
new file mode 100644
index 0000000000..1bf61aad70
--- /dev/null
+++ b/components/libc/signal/posix_signal.c
@@ -0,0 +1,115 @@
+/*
+ * File      : signal.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/10/1      Bernard      The first version
+ */
+#include <rthw.h>
+#include <rtthread.h>
+
+#include <time.h>
+
+#include "posix_signal.h"
+#define sig_valid(sig_no)   (sig_no >= 0 && sig_no < RT_SIG_MAX)
+
+void (*signal(int sig, void (*func)(int))) (int)
+{
+	return rt_signal_install(sig, func);
+}
+
+int sigprocmask (int how, const sigset_t *set, sigset_t *oset)
+{
+	rt_base_t level;
+    rt_thread_t tid;
+
+    tid = rt_thread_self();
+
+	level = rt_hw_interrupt_disable();
+	if (oset) *oset = tid->sig_mask;
+
+	if (set)
+	{
+		switch(how)
+		{
+		case SIG_BLOCK:
+			tid->sig_mask |= *set;
+			break;
+		case SIG_UNBLOCK:
+			tid->sig_mask &= ~*set;
+			break;
+		case SIG_SETMASK:
+			tid->sig_mask =  *set;
+			break;
+		default:
+			break;
+		}
+	}
+	rt_hw_interrupt_enable(level);
+
+    return 0;
+}
+
+int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact)
+{
+    rt_sighandler_t old = RT_NULL;
+
+	if (!sig_valid(signum)) return -RT_ERROR;
+
+	if (act)
+		old = rt_signal_install(signum, act->sa_handler);
+	else
+	{
+		old = rt_signal_install(signum, RT_NULL);
+		rt_signal_install(signum, old);
+	}
+
+	if (oldact)
+		oldact->sa_handler = old;
+
+    return 0;
+}
+
+int sigtimedwait(const sigset_t *set, siginfo_t *info,
+       const struct timespec *timeout)
+{
+	return 0;
+}
+
+int sigwait(const sigset_t *set, int *sig)
+{
+    siginfo_t si;
+    if (sigtimedwait(set, &si, 0) < 0)
+        return -1;
+
+    *sig = si.si_signo;
+    return 0;
+}
+
+int sigwaitinfo(const sigset_t *set, siginfo_t *info)
+{
+  return sigtimedwait(set, info, NULL);
+}
+
+int raise(int sig)
+{
+	rt_thread_kill(rt_thread_self(), sig);
+    return 0;
+}
+
diff --git a/components/libc/signal/posix_signal.h b/components/libc/signal/posix_signal.h
new file mode 100644
index 0000000000..e0a2039926
--- /dev/null
+++ b/components/libc/signal/posix_signal.h
@@ -0,0 +1,126 @@
+/*
+ * File      : signals.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/10/1      Bernard      The first version
+ */
+
+#ifndef POSIX_SIGNAL_H__
+#define POSIX_SIGNAL_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rtthread.h>
+
+enum rt_signal_value{
+    SIG1 = SIGHUP,
+    SIG2 = SIGINT,
+    SIG3 = SIGQUIT,
+    SIG4 = SIGILL,
+    SIG5 = SIGTRAP,
+    SIG6 = SIGABRT,
+    SIG7 = SIGEMT,
+    SIG8 = SIGFPE,
+    SIG9 = SIGKILL,
+    SIG10 = SIGBUS,
+    SIG11 = SIGSEGV,
+    SIG12 = SIGSYS,
+    SIG13 = SIGPIPE,
+    SIG14 = SIGALRM,
+    SIG15 = SIGTERM,
+    SIG16 = SIGURG,
+    SIG17 = SIGSTOP,
+    SIG18 = SIGTSTP,
+    SIG19 = SIGCONT,
+    SIG20 = SIGCHLD,
+    SIG21 = SIGTTIN,
+    SIG22 = SIGTTOU,
+    SIG23 = SIGPOLL,
+    SIG24 = 24, // SIGXCPU,
+    SIG25 = 25, // SIGXFSZ,
+    SIG26 = 26, // SIGVTALRM,
+    SIG27 = 27, // SIGPROF,
+    SIG28 = SIGWINCH,
+    SIG29 = 29, // SIGLOST,
+    SIG30 = SIGUSR1,
+    SIG31 = SIGUSR2,
+    SIGRT_MIN = 27, // SIGRTMIN,
+    SIGRT_MAX = 31, // SIGRTMAX,
+    SIGMAX = NSIG,
+};
+
+/*
+The structure definitions on newlib:
+
+typedef void (*_sig_func_ptr)(int);
+
+struct sigaction
+{
+    _sig_func_ptr sa_handler;
+    sigset_t sa_mask;
+    int sa_flags;
+};
+
+typedef int sig_atomic_t;
+
+typedef _sig_func_ptr sig_t;
+typedef _sig_func_ptr sighandler_t;
+
+When enable POSIX_REALTIME_SIGNALS/POSIX_THREADS:
+
+union sigval {
+  int sival_int;
+  void *sival_ptr;
+};
+
+struct sigevent {
+  int sigev_notify;
+  int sigev_signo;
+  union sigval sigev_value;
+
+
+  void (*sigev_notify_function)( union sigval );
+
+  pthread_attr_t *sigev_notify_attributes;
+
+};
+
+typedef struct {
+  int si_signo;
+  int si_code;
+  union sigval si_value;
+} siginfo_t;
+
+*/
+
+rt_sighandler_t rt_signal_install(int signo, rt_sighandler_t handler);
+void rt_signal_mask(int signo);
+void rt_signal_unmask(int signo);
+int rt_thread_kill(rt_thread_t tid, int sig);
+
+int rt_system_signal_init(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/components/libc/termios/SConscript b/components/libc/termios/SConscript
new file mode 100644
index 0000000000..ef05e688bb
--- /dev/null
+++ b/components/libc/termios/SConscript
@@ -0,0 +1,13 @@
+# RT-Thread building script for component
+
+from building import *
+
+cwd = GetCurrentDir()
+src = Glob('*.c') + Glob('*.cpp')
+CPPPATH = [cwd]
+
+group = DefineGroup('libc', src, 
+    depend = ['RT_USING_LIBC', 'RT_USING_POSIX_TERMIOS'], 
+    CPPPATH = CPPPATH)
+
+Return('group')
diff --git a/components/libc/termios/posix_termios.c b/components/libc/termios/posix_termios.c
new file mode 100644
index 0000000000..4e863ea507
--- /dev/null
+++ b/components/libc/termios/posix_termios.c
@@ -0,0 +1,154 @@
+/*
+ * File      : termios.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/08/30      Bernard      The first version
+ */
+#include <stdlib.h>
+#include <string.h>
+#include <rtthread.h>
+#include <dfs_posix.h>
+
+#include <termios.h>
+
+#include "posix_termios.h"
+
+int tcgetattr(int fd, struct termios *tio)
+{
+	/* Get the current serial port settings. */
+    if (ioctl(fd, TCGETA, tio))
+        return -1;
+
+    return 0;
+}
+
+int tcsetattr(int fd, int act, const struct termios *tio)
+{
+	switch (act) 
+	{
+	case TCSANOW:
+		/* make the change immediately */
+		return (ioctl(fd, TCSETA, (void*)tio));
+	case TCSADRAIN:
+		/*
+		 * Don't make the change until all currently written data 
+		 * has been transmitted.
+		 */
+		return (ioctl(fd, TCSETAW, (void*)tio));
+	case TCSAFLUSH:
+		/* Don't make the change until all currently written data 
+		 * has been transmitted, at which point any received but 
+		 * unread data is also discarded.
+		 */
+		return (ioctl(fd, TCSETAF, (void*)tio));
+	default:
+		errno = EINVAL;
+		return (-1);
+	}
+}
+
+/**
+ * this function gets process group ID for session leader for controlling 
+ * terminal
+ *
+ * @return always 0
+ */
+pid_t tcgetsid(int fd)
+{
+    return 0;
+}
+
+speed_t cfgetospeed(const struct termios *tio)
+{
+    return tio->c_cflag & CBAUD;
+}
+
+speed_t cfgetispeed(const struct termios *tio)
+{
+    return cfgetospeed(tio);
+}
+
+int cfsetospeed(struct termios *tio, speed_t speed)
+{
+    if (speed & ~CBAUD) 
+    {
+        errno = EINVAL;
+        return -1;
+    }
+
+    tio->c_cflag &= ~CBAUD;
+    tio->c_cflag |= speed;
+    return 0;
+}
+
+int cfsetispeed(struct termios *tio, speed_t speed)
+{
+    return speed ? cfsetospeed(tio, speed) : 0;
+}
+
+int tcsendbreak(int fd, int dur)
+{
+    /* nonzero duration is implementation-defined, so ignore it */
+	return 0;
+}
+
+int tcflush(int fd, int queue)
+{
+    return ioctl(fd, TCFLSH, (void*)queue);
+}
+
+int tcflow(int fd, int action)
+{
+    return ioctl(fd, TCXONC, (void*)action);
+}
+
+/**
+ * this function waits for transmission of output
+ */
+int tcdrain(int fd)
+{
+	return 0;
+}
+
+int isatty (int  fd)
+{
+	struct termios term;
+
+	return tcgetattr (fd, &term) == 0;
+}
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+void cfmakeraw(struct termios *t)
+{
+    t->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
+    t->c_oflag &= ~OPOST;
+    t->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
+    t->c_cflag &= ~(CSIZE|PARENB);
+    t->c_cflag |= CS8;
+    t->c_cc[VMIN] = 1;
+    t->c_cc[VTIME] = 0;
+}
+
+int cfsetspeed(struct termios *tio, speed_t speed)
+{
+    return cfsetospeed(tio, speed);
+}
+#endif
+
diff --git a/components/libc/termios/posix_termios.h b/components/libc/termios/posix_termios.h
new file mode 100644
index 0000000000..b5bd1d50f4
--- /dev/null
+++ b/components/libc/termios/posix_termios.h
@@ -0,0 +1,226 @@
+/*
+ * File      : termios.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2017, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017/08/30      Bernard      The first version
+ */
+#ifndef TERMIOS_H__
+#define TERMIOS_H__
+
+#include <rtthread.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef unsigned char cc_t;
+typedef unsigned int speed_t;
+typedef unsigned int tcflag_t;
+
+#define NCCS 32
+
+struct termios {
+    tcflag_t c_iflag;
+    tcflag_t c_oflag;
+    tcflag_t c_cflag;
+    tcflag_t c_lflag;
+    cc_t c_line;
+    cc_t c_cc[NCCS];
+    speed_t __c_ispeed;
+    speed_t __c_ospeed;
+};
+
+#define VINTR     0
+#define VQUIT     1
+#define VERASE    2
+#define VKILL     3
+#define VEOF      4
+#define VTIME     5
+#define VMIN      6
+#define VSWTC     7
+#define VSTART    8
+#define VSTOP     9
+#define VSUSP    10
+#define VEOL     11
+#define VREPRINT 12
+#define VDISCARD 13
+#define VWERASE  14
+#define VLNEXT   15
+#define VEOL2    16
+
+#define IGNBRK  0000001
+#define BRKINT  0000002
+#define IGNPAR  0000004
+#define PARMRK  0000010
+#define INPCK   0000020
+#define ISTRIP  0000040
+#define INLCR   0000100
+#define IGNCR   0000200
+#define ICRNL   0000400
+#define IUCLC   0001000
+#define IXON    0002000
+#define IXANY   0004000
+#define IXOFF   0010000
+#define IMAXBEL 0020000
+#define IUTF8   0040000
+
+#define OPOST  0000001
+#define OLCUC  0000002
+#define ONLCR  0000004
+#define OCRNL  0000010
+#define ONOCR  0000020
+#define ONLRET 0000040
+#define OFILL  0000100
+#define OFDEL  0000200
+#define NLDLY  0000400
+#define NL0    0000000
+#define NL1    0000400
+#define CRDLY  0003000
+#define CR0    0000000
+#define CR1    0001000
+#define CR2    0002000
+#define CR3    0003000
+#define TABDLY 0014000
+#define TAB0   0000000
+#define TAB1   0004000
+#define TAB2   0010000
+#define TAB3   0014000
+#define BSDLY  0020000
+#define BS0    0000000
+#define BS1    0020000
+#define FFDLY  0100000
+#define FF0    0000000
+#define FF1    0100000
+
+#define VTDLY  0040000
+#define VT0    0000000
+#define VT1    0040000
+
+#define B0       0000000
+#define B50      0000001
+#define B75      0000002
+#define B110     0000003
+#define B134     0000004
+#define B150     0000005
+#define B200     0000006
+#define B300     0000007
+#define B600     0000010
+#define B1200    0000011
+#define B1800    0000012
+#define B2400    0000013
+#define B4800    0000014
+#define B9600    0000015
+#define B19200   0000016
+#define B38400   0000017
+
+#define B57600   0010001
+#define B115200  0010002
+#define B230400  0010003
+#define B460800  0010004
+#define B500000  0010005
+#define B576000  0010006
+#define B921600  0010007
+#define B1000000 0010010
+#define B1152000 0010011
+#define B1500000 0010012
+#define B2000000 0010013
+#define B2500000 0010014
+#define B3000000 0010015
+#define B3500000 0010016
+#define B4000000 0010017
+
+#define CSIZE  0000060
+#define CS5    0000000
+#define CS6    0000020
+#define CS7    0000040
+#define CS8    0000060
+#define CSTOPB 0000100
+#define CREAD  0000200
+#define PARENB 0000400
+#define PARODD 0001000
+#define HUPCL  0002000
+#define CLOCAL 0004000
+
+#define ISIG   0000001
+#define ICANON 0000002
+#define ECHO   0000010
+#define ECHOE  0000020
+#define ECHOK  0000040
+#define ECHONL 0000100
+#define NOFLSH 0000200
+#define TOSTOP 0000400
+#define IEXTEN 0100000
+
+#define TCOOFF 0
+#define TCOON  1
+#define TCIOFF 2
+#define TCION  3
+
+#define TCIFLUSH  0
+#define TCOFLUSH  1
+#define TCIOFLUSH 2
+
+#define TCSANOW   0
+#define TCSADRAIN 1
+#define TCSAFLUSH 2
+
+#define EXTA    0000016
+#define EXTB    0000017
+#define CBAUD   0010017
+#define CBAUDEX 0010000
+#define CIBAUD  002003600000
+#define CMSPAR  010000000000
+#define CRTSCTS 020000000000
+
+#define XCASE   0000004
+#define ECHOCTL 0001000
+#define ECHOPRT 0002000
+#define ECHOKE  0004000
+#define FLUSHO  0010000
+#define PENDIN  0040000
+#define EXTPROC 0200000
+
+#define XTABS  0014000
+
+speed_t cfgetospeed (const struct termios *);
+speed_t cfgetispeed (const struct termios *);
+int cfsetospeed (struct termios *, speed_t);
+int cfsetispeed (struct termios *, speed_t);
+
+int tcgetattr (int, struct termios *);
+int tcsetattr (int, int, const struct termios *);
+
+int tcsendbreak (int, int);
+int tcdrain (int);
+int tcflush (int, int);
+int tcflow (int, int);
+
+pid_t tcgetsid (int);
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+void cfmakeraw(struct termios *);
+int cfsetspeed(struct termios *, speed_t);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/components/libc/timer/SConscript b/components/libc/timer/SConscript
new file mode 100644
index 0000000000..a01700aa8d
--- /dev/null
+++ b/components/libc/timer/SConscript
@@ -0,0 +1,12 @@
+# RT-Thread building script for component
+
+from building import *
+
+cwd = GetCurrentDir()
+src = Glob('*.c') + Glob('*.cpp')
+CPPPATH = [cwd]
+
+group = DefineGroup('libc', src, 
+    depend = ['RT_USING_LIBC', 'RT_USING_POSIX_TIMER'], CPPPATH = CPPPATH)
+
+Return('group')
diff --git a/components/libc/timer/posix_sleep.c b/components/libc/timer/posix_sleep.c
new file mode 100644
index 0000000000..b4b33722ac
--- /dev/null
+++ b/components/libc/timer/posix_sleep.c
@@ -0,0 +1,15 @@
+#include <stdlib.h>
+#include <rtthread.h>
+
+#include <unistd.h>
+
+unsigned int sleep(unsigned int seconds)
+{
+    rt_tick_t delta_tick;
+
+    delta_tick = rt_tick_get();
+    rt_thread_delay(seconds * RT_TICK_PER_SECOND);
+    delta_tick = rt_tick_get() - delta_tick;
+
+    return seconds - delta_tick/RT_TICK_PER_SECOND;
+}