From db2ceea2ce5dd9992be92de79d42ed0fe18ca71a Mon Sep 17 00:00:00 2001
From: "bernard.xiong@gmail.com" <bernard.xiong@gmail.com>
Date: Fri, 17 Feb 2012 16:26:49 +0000
Subject: [PATCH] remove the dependence of device file system when enable
 newlib.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1955 bbd45198-f89e-11dd-88c7-29a3b14d5316
---
 components/libc/newlib/libc.c     |  2 ++
 components/libc/newlib/syscalls.c | 47 +++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)

diff --git a/components/libc/newlib/libc.c b/components/libc/newlib/libc.c
index bd3797b6c4..797c393db8 100644
--- a/components/libc/newlib/libc.c
+++ b/components/libc/newlib/libc.c
@@ -10,6 +10,7 @@ void libc_system_init(const char* tty_name)
 	int fd;
 	extern int pthread_system_init(void);
 
+#ifdef RT_USING_DFS
 #ifndef RT_USING_DFS_DEVFS
 #error Please enable devfs by defining RT_USING_DFS_DEVFS in rtconfig.h
 #endif
@@ -21,6 +22,7 @@ void libc_system_init(const char* tty_name)
 	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 */
+#endif
 
 	/* set PATH and HOME */
 	putenv("PATH=/");
diff --git a/components/libc/newlib/syscalls.c b/components/libc/newlib/syscalls.c
index 3baef81419..7b918f2eb5 100644
--- a/components/libc/newlib/syscalls.c
+++ b/components/libc/newlib/syscalls.c
@@ -8,7 +8,11 @@
 int
 _close_r(struct _reent *ptr, int fd)
 {
+#ifndef RT_USING_DFS
+	return 0;
+#else
 	return close(fd);
+#endif
 }
 
 int
@@ -78,46 +82,66 @@ _link_r(struct _reent *ptr, const char *old, const char *new)
 _off_t
 _lseek_r(struct _reent *ptr, int fd, _off_t pos, int whence)
 {
+#ifndef RT_USING_DfS
+	return 0;
+#else
 	_off_t rc;
 
 	rc = lseek(fd, pos, whence);
 	return rc;
+#endif
 }
 
 int
 _mkdir_r(struct _reent *ptr, const char *name, int mode)
 {
+#ifndef RT_USING_DFS
+	return 0;
+#else
 	int rc;
 
 	rc = mkdir(name, mode);
 	return rc;
+#endif
 }
 
 int
 _open_r(struct _reent *ptr, const char *file, int flags, int mode)
 {
+#ifndef RT_USING_DFS
+	return 0;
+#else
 	int rc;
 
 	rc = open(file, flags, mode);
 	return rc;
+#endif
 }
 
 _ssize_t 
 _read_r(struct _reent *ptr, int fd, void *buf, size_t nbytes)
 {
+#ifndef RT_USING_DFS
+	return 0;
+#else
 	_ssize_t rc;
 
 	rc = read(fd, buf, nbytes);
 	return rc;
+#endif
 }
 
 int
 _rename_r(struct _reent *ptr, const char *old, const char *new)
 {
+#ifndef RT_USING_DFS
+	return 0;
+#else
 	int rc;
 
 	rc = rename(old, new);
 	return rc;
+#endif
 }
 
 void *
@@ -130,10 +154,14 @@ _sbrk_r(struct _reent *ptr, ptrdiff_t incr)
 int
 _stat_r(struct _reent *ptr, const char *file, struct stat *pstat)
 {
+#ifndef RT_USING_DFS
+	return 0;
+#else
 	int rc;
 
 	rc = stat(file, pstat);
 	return rc;
+#endif
 }
 
 _CLOCK_T_
@@ -147,10 +175,14 @@ _times_r(struct _reent *ptr, struct tms *ptms)
 int
 _unlink_r(struct _reent *ptr, const char *file)
 {
+#ifndef RT_USING_DFS
+	return 0;
+#else
 	int rc;
 
 	rc = unlink(file);
 	return rc;
+#endif
 }
 
 int
@@ -164,10 +196,23 @@ _wait_r(struct _reent *ptr, int *status)
 _ssize_t
 _write_r(struct _reent *ptr, int fd, const void *buf, size_t nbytes)
 {
+#ifndef RT_USING_DFS
+	if (fd < 3)
+	{
+		rt_device_t console_device;
+		extern rt_device_t rt_console_get_device(void);
+
+		console_device = rt_console_get_device();
+		if (console_device != 0) rt_device_write(console_device, 0, buf, nbytes);
+		return nbytes;
+	}
+	return 0;
+#else
 	_ssize_t rc;
 
 	rc = write(fd, buf, nbytes);
 	return rc;
+#endif
 }
 
 #ifndef RT_USING_PTHREADS
@@ -332,4 +377,6 @@ _exit (int status)
 {
 	rt_kprintf("thread:%s exit with %d\n", rt_thread_self()->name, status);
     RT_ASSERT(0);
+
+    while (1);
 }