add stdin, stdout, stderr implementation in newlib.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1029 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/libc/newlib/libc.c

+#include <rtthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+
+void libc_system_init(const char* tty_name)
+{
+	int fd;
+
+	/* init console device */
+	rt_console_init(tty_name);
+
+	/* open console as stdin/stdout/stderr */
+	fd = open("/dev/console", O_RDONLY, 0);	/* for stdin */
+	rt_kprintf("stdin: %d\n", fd);
+	fd = open("/dev/console", O_WRONLY, 0);	/* for stdout */
+	rt_kprintf("stdout: %d\n", fd);
+	fd = open("/dev/console", O_WRONLY, 0);	/* for stderr */
+	rt_kprintf("stderr: %d\n", fd);
+}

components/libc/newlib/libc.h

+#ifndef __RTT_LIBC_H__
+#define __RTT_LIBC_H__
+
+void libc_system_init(const char* tty_name);
+
+#endif

components/libc/newlib/syscalls.c

@@ -51,6 +51,8 @@ _getpid_r(struct _reent *ptr)
 int
 _isatty_r(struct _reent *ptr, int fd)
 {
+	if (fd >=0 && fd < 3) return 1;
+
 	/* return "not supported" */
 	ptr->_errno = ENOTSUP;
 	return -1;
@@ -198,3 +200,18 @@ _free_r (struct _reent *ptr, void *addr)
 {
 	rt_free (addr);
 }
+
+#ifdef RT_USING_FINSH
+#include <finsh.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+void nltest()
+{
+	printf("stdout test!!\n");
+	fprintf(stdout, "fprintf test!!\n");
+	fprintf(stderr, "fprintf test!!\n");
+}
+FINSH_FUNCTION_EXPORT(nltest, newlib test);
+#endif
+