[libc] Change libc stubs to compiler folder.

components/libc/compilers/dlib/README.md

@@ -0,0 +1,4 @@
+Dlib(IAR) porting for RT-Thread.
+
+Please define RT_USING_LIBC and compile RT-Thread with IAR compiler.
+

components/libc/compilers/dlib/SConscript

@@ -0,0 +1,19 @@
+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'):
+        CPPDEFINES = CPPDEFINES + ['_DLIB_FILE_DESCRIPTOR', '_DLIB_THREAD_SUPPORT']
+
+    group = DefineGroup('dlib', src, depend = ['RT_USING_LIBC'], 
+        CPPPATH = CPPPATH, CPPDEFINES = CPPDEFINES)
+
+Return('group')

components/libc/compilers/dlib/environ.c

@@ -0,0 +1,25 @@
+/* File: environ.c
+ * this file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2015, 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
+ * 2015-01-28     Bernard      first version
+ */
+
+const char *__environ = "OS=RT-Thread";
+

components/libc/compilers/dlib/rmtx.c

@@ -0,0 +1,74 @@
+/*
+ * File      : rmtx.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2015, 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
+ * 2015-01-28     Bernard      first version
+ */
+#include <rtthread.h>
+#include <yfuns.h>
+
+/*
+ * for IAR compiler, we recommand to define _DLIB_THREAD_SUPPORT
+ * as 2 for dlib multi-thread support.
+ */
+
+#if _DLIB_THREAD_SUPPORT
+typedef void* _Rmtx;
+void _Mtxinit(_Rmtx *m)
+{
+    rt_mutex_t mutex;
+
+    RT_ASSERT(m != RT_NULL);
+    
+    mutex = (rt_mutex_t)m;
+    rt_mutex_init(mutex, "iarMtx", RT_IPC_FLAG_FIFO);
+}
+
+void _Mtxdst(_Rmtx *m)
+{
+    rt_mutex_t mutex;
+
+    RT_ASSERT(m != RT_NULL);
+
+    mutex = (rt_mutex_t)m;
+    rt_mutex_detach(mutex);
+}
+
+void _Mtxlock(_Rmtx *m)
+{
+    rt_mutex_t mutex;
+
+    RT_ASSERT(m != RT_NULL);
+
+    mutex = (rt_mutex_t)m;
+    rt_mutex_take(mutex, RT_WAITING_FOREVER);
+}
+
+void _Mtxunlock(_Rmtx *m)
+{
+    rt_mutex_t mutex;
+
+    RT_ASSERT(m != RT_NULL);
+
+    mutex = (rt_mutex_t)m;
+    rt_mutex_release(mutex);
+}
+#endif
+

components/libc/compilers/dlib/sys/README.md

@@ -0,0 +1 @@
+Because IAR leaks some system header file, we put them in here. 

components/libc/compilers/dlib/sys/errno.h

@@ -0,0 +1,80 @@
+#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 */
+
+#endif

components/libc/compilers/dlib/sys/time.h

@@ -0,0 +1,45 @@
+#ifndef _SYS_TIME_H_
+#define _SYS_TIME_H_
+
+#include <time.h>
+#include <sys/types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef _TIMEVAL_DEFINED
+#define _TIMEVAL_DEFINED
+/*
+ * Structure returned by gettimeofday(2) system call,
+ * and used in other calls.
+ */
+struct timeval {
+    long    tv_sec;     /* seconds */
+    long    tv_usec;    /* and microseconds */
+};
+#endif /* _TIMEVAL_DEFINED */
+
+#ifndef _TIMESPEC_DEFINED
+#define _TIMESPEC_DEFINED
+/*
+ * Structure defined by POSIX.1b to be like a timeval.
+ */
+struct timespec {
+    time_t  tv_sec;     /* seconds */
+    long    tv_nsec;    /* and nanoseconds */
+};
+#endif /* _TIMESPEC_DEFINED */ 
+
+struct timezone {
+  int tz_minuteswest;   /* minutes west of Greenwich */
+  int tz_dsttime;       /* type of dst correction */
+};
+
+int gettimeofday(struct timeval *tp, void *ignore);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SYS_TIME_H_ */

components/libc/compilers/dlib/sys/types.h

@@ -0,0 +1,14 @@
+#ifndef __TYPES_H__
+#define __TYPES_H__
+
+#include <stdint.h>
+#include <rtthread.h>
+
+typedef rt_int32_t clockid_t;
+typedef rt_int32_t key_t;       /* Used for interprocess communication. */
+typedef rt_int32_t pid_t;       /* Used for process IDs and process group IDs. */
+typedef signed long ssize_t;    /* Used for a count of bytes or an error indication. */
+
+typedef int mode_t;
+
+#endif

components/libc/compilers/dlib/sys/unistd.h

@@ -0,0 +1,34 @@
+#ifndef _SYS_UNISTD_H
+#define _SYS_UNISTD_H
+
+#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	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 */

components/libc/compilers/dlib/syscall_close.c

@@ -0,0 +1,43 @@
+/*
+ * File      : syscall_close.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2015, 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
+ * 2015-01-28     Bernard      first version
+ */
+#include <rtthread.h>
+#ifdef RT_USING_DFS
+#include <dfs_posix.h>
+#endif
+#include <yfuns.h>
+
+#pragma module_name = "?__close"
+int __close(int handle)
+{
+    if (handle == _LLIO_STDOUT ||
+        handle == _LLIO_STDERR ||
+        handle == _LLIO_STDIN)
+        return _LLIO_ERROR;
+
+#ifdef RT_USING_DFS
+    return close(handle - _LLIO_STDERR - 1);
+#else
+    return 0;
+#endif
+}

components/libc/compilers/dlib/syscall_lseek.c

@@ -0,0 +1,43 @@
+/*
+ * File      : syscall_lseek.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2015, 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
+ * 2015-01-28     Bernard      first version
+ */
+#include <rtthread.h>
+#ifdef RT_USING_DFS
+#include <dfs_posix.h>
+#endif
+#include <yfuns.h>
+
+#pragma module_name = "?__lseek"
+long __lseek(int handle, long offset, int whence)
+{
+    if (handle == _LLIO_STDOUT ||
+        handle == _LLIO_STDERR ||
+        handle == _LLIO_STDIN)
+        return _LLIO_ERROR;
+
+#ifdef RT_USING_DFS
+    return lseek(handle - _LLIO_STDERR - 1, offset, whence);
+#else
+    return _LLIO_ERROR;
+#endif
+}

components/libc/compilers/dlib/syscall_mem.c

@@ -0,0 +1,44 @@
+/*
+ * File      : syscall_mem.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2015, 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
+ * 2015-01-28     Bernard      first version
+ */
+#include <rtthread.h>
+
+void *malloc(rt_size_t n)
+{
+    return rt_malloc(n);
+}
+
+void *realloc(void *rmem, rt_size_t newsize)
+{
+    return rt_realloc(rmem, newsize);
+}
+
+void *calloc(rt_size_t nelem, rt_size_t elsize)
+{
+	return rt_calloc(nelem, elsize);
+}
+
+void free(void *rmem)
+{
+    rt_free(rmem);
+}

components/libc/compilers/dlib/syscall_open.c

@@ -0,0 +1,88 @@
+/*
+* File      : syscall_open.c
+* This file is part of RT-Thread RTOS
+* COPYRIGHT (C) 2006 - 2015, 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
+* 2015-01-28     Bernard      first version
+*/
+
+#include <rtthread.h>
+#include <yfuns.h>
+#ifdef RT_USING_DFS
+#include <dfs_posix.h>
+#endif
+
+#pragma module_name = "?__open"
+
+int __open(const char *filename, int mode)
+{
+#ifndef RT_USING_DFS
+  return -1;
+#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;
+  }
+  
+  handle = open(filename, open_mode, 0);
+  if (handle < 0)
+    return -1;
+  
+  return handle + _LLIO_STDERR + 1;
+#endif
+}

components/libc/compilers/dlib/syscall_read.c

@@ -0,0 +1,53 @@
+/*
+ * File      : syscall_read.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2015, 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
+ * 2015-01-28     Bernard      first version
+ */
+
+#include <rtthread.h>
+#ifdef RT_USING_DFS
+#include <dfs_posix.h>
+#endif
+#include <yfuns.h>
+
+#pragma module_name = "?__read"
+size_t __read(int handle, unsigned char *buf, size_t len)
+{
+#ifdef RT_USING_DFS
+    int size;
+#endif
+
+    if (handle == _LLIO_STDIN)
+    {
+        /* TODO */
+        return 0;
+    }
+
+    if ((handle == _LLIO_STDOUT) || (handle == _LLIO_STDERR))
+        return _LLIO_ERROR;
+
+#ifndef RT_USING_DFS
+    return _LLIO_ERROR;
+#else
+    size = read(handle - _LLIO_STDERR - 1, buf, len);
+    return size;
+#endif
+}

components/libc/compilers/dlib/syscall_remove.c

@@ -0,0 +1,38 @@
+/*
+ * File      : syscall_remove.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2015, 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
+ * 2015-01-28     Bernard      first version
+ */
+#include <rtthread.h>
+#ifdef RT_USING_DFS
+#include <dfs_file.h>
+#endif
+#include <yfuns.h>
+
+#pragma module_name = "?remove"
+int remove(const char *val)
+{
+#ifdef RT_USING_DFS
+    dfs_file_unlink(val);
+#endif
+
+    return 0;
+}

components/libc/compilers/dlib/syscall_write.c

@@ -0,0 +1,62 @@
+/*
+ * File      : syscall_write.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2015, 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
+ * 2015-01-28     Bernard      first version
+ */
+
+#include <rtthread.h>
+#ifdef RT_USING_DFS
+#include <dfs_posix.h>
+#endif
+#include <yfuns.h>
+
+#pragma module_name = "?__write"
+
+size_t __write(int handle, const unsigned char *buf, size_t len)
+{
+#ifdef RT_USING_DFS
+    int size;
+#endif
+
+    if ((handle == _LLIO_STDOUT) || (handle == _LLIO_STDERR))
+    {
+#ifndef RT_USING_CONSOLE
+        return _LLIO_ERROR;
+#else
+        rt_device_t console_device;
+
+        console_device = rt_console_get_device();
+        if (console_device != 0) rt_device_write(console_device, 0, buf, len);
+
+        return len;
+#endif
+    }
+
+    if (handle == _LLIO_STDIN) return -1;
+
+#ifndef RT_USING_DFS
+    return _LLIO_ERROR;
+#else
+    size = write(handle - _LLIO_STDERR - 1, buf, len);
+    return size;
+#endif
+}
+

components/libc/compilers/dlib/syscalls.h

@@ -0,0 +1,23 @@
+/* File: syscalls.h
+ * this file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2015, 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
+ * 2015-01-28     Bernard      first version
+ */
+