1 files changed, 115 insertions, 0 deletions
diff --git a/components/logtrace/log_file.c b/components/logtrace/log_file.c
new file mode 100644
index 0000000000..c5815536b2
--- /dev/null
+++ b/components/logtrace/log_file.c
@@ -0,0 +1,115 @@
+/*
+ * File      : log_file.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2013, 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
+ *                Bernard      the first version
+ * 2013-06-26     Grissiom     refactor
+ */
+
+#ifdef RT_USING_DFS
+
+#include <rtthread.h>
+#include <log_trace.h>
+#include <dfs_posix.h>
+
+struct file_device
+{
+    struct rt_device parent;
+
+    int  fd;
+    char *filename;
+};
+
+/* file device for log trace */
+static struct file_device _file_device;
+
+/* common device interface */
+rt_err_t fdevice_open(rt_device_t dev, rt_uint16_t oflag)
+{
+    int fd;
+    struct file_device *file = (struct file_device *)dev;
+    if (file->fd >= 0) return -RT_EBUSY;
+
+    fd = open(file->filename, O_RDONLY, 0);
+    if (fd >= 0)
+    {
+        close(fd);
+
+        /* file exists */
+        fd = open(file->filename, O_WRONLY | O_APPEND, 0);
+    }
+    else
+    {
+        /* file not exists */
+        fd = open(file->filename, O_WRONLY | O_CREAT, 0);
+    }
+
+    file->fd = fd;
+    return RT_EOK;
+}
+
+rt_err_t fdevice_close(rt_device_t dev)
+{
+    rt_err_t result;
+
+    struct file_device *file = (struct file_device *)dev;
+    if (file->fd < 0) return -RT_EBUSY;
+
+    result = close(file->fd);
+    if (result == 0)
+    {
+        file->fd = -1;
+    }
+
+    return result;
+}
+
+rt_size_t fdevice_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
+{
+    struct file_device *file = (struct file_device *)dev;
+    if (file->fd < 0) return 0;
+
+    return write(file->fd, buffer, size);
+}
+
+void log_trace_file_init(const char *filename)
+{
+    rt_device_t device;
+
+    device = rt_device_find("logfile");
+    if (device == RT_NULL)
+    {
+        rt_memset(&_file_device, 0x00, sizeof(_file_device));
+
+        _file_device.parent.type  = RT_Device_Class_Char;
+
+        _file_device.parent.init  = RT_NULL;
+        _file_device.parent.open  = fdevice_open;
+        _file_device.parent.close = fdevice_close;
+        _file_device.parent.write = fdevice_write;
+
+        rt_device_register(&_file_device.parent, "logfile", O_RDWR);
+    }
+
+    _file_device.filename = rt_strdup(filename);
+    _file_device.fd = -1;
+}
+
+#endif // RT_USING_DFS