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/*
* 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
*/
#include <rtthread.h>
#include <log_trace.h>
#ifdef RT_USING_DFS
#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 */
static rt_err_t fdevice_open(rt_device_t dev, rt_uint16_t oflag)
{
int fd;
struct file_device *fdev = (struct file_device *)dev;
if (fdev->fd >= 0)
return -RT_EBUSY;
/* test and open */
fd = open(fdev->filename, O_RDONLY, 0);
if (fd >= 0)
{
close(fd);
fd = open(fdev->filename, O_WRONLY | O_APPEND, 0);
}
else
{
/* file not exists */
fd = open(fdev->filename, O_WRONLY | O_CREAT, 0);
}
fdev->fd = fd;
return RT_EOK;
}
static rt_err_t fdevice_close(rt_device_t dev)
{
rt_err_t result;
struct file_device *fdev = (struct file_device *)dev;
if (fdev->fd < 0)
return -RT_EBUSY;
result = close(fdev->fd);
if (result == 0)
{
fdev->fd = -1;
}
return result;
}
static rt_size_t fdevice_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
{
struct file_device *fdev = (struct file_device *)dev;
if (fdev->fd < 0)
return 0;
return write(fdev->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;
}
void log_trace_set_file(const char *filename)
{
log_trace_file_init(filename);
log_trace_set_device("logfile");
}
#ifdef RT_USING_FINSH
#include <finsh.h>
FINSH_FUNCTION_EXPORT_ALIAS(log_trace_set_file, log_file, set output filename of log trace);
#endif
#endif /* RT_USING_DFS */
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