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/*
* Copyright (C) 2007-2009 B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* 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
*
*/
#include "main.h"
#include "log.h"
#define LOG_BUF_MASK (log_buf_len-1)
#define LOG_BUF(idx) (log_buf[(idx) & LOG_BUF_MASK])
static char log_buf[LOG_BUF_LEN];
static int log_buf_len = LOG_BUF_LEN;
static unsigned long log_start;
static unsigned long log_end;
uint8_t log_level;
static DEFINE_SPINLOCK(logbuf_lock);
const struct file_operations proc_log_operations = {
.open = log_open,
.release = log_release,
.read = log_read,
.write = log_write,
.poll = log_poll,
};
static DECLARE_WAIT_QUEUE_HEAD(log_wait);
static void emit_log_char(char c)
{
LOG_BUF(log_end) = c;
log_end++;
if (log_end - log_start > log_buf_len)
log_start = log_end - log_buf_len;
}
static int fdebug_log(char *fmt, ...)
{
int printed_len;
char *p;
va_list args;
static char debug_log_buf[256];
unsigned long flags;
spin_lock_irqsave(&logbuf_lock, flags);
va_start(args, fmt);
printed_len = vscnprintf(debug_log_buf, sizeof(debug_log_buf), fmt,
args);
va_end(args);
for (p = debug_log_buf; *p != 0; p++)
emit_log_char(*p);
spin_unlock_irqrestore(&logbuf_lock, flags);
wake_up(&log_wait);
return 0;
}
int debug_log(int type, char *fmt, ...)
{
va_list args;
int retval = 0;
char tmp_log_buf[256];
/* only critical information get into the official kernel log */
if (type == LOG_TYPE_CRIT) {
va_start(args, fmt);
vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args);
printk(KERN_ERR "batman-adv: %s", tmp_log_buf);
va_end(args);
}
if ((type == LOG_TYPE_CRIT) || (log_level & type)) {
va_start(args, fmt);
vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args);
fdebug_log("[%10u] %s", (jiffies / HZ), tmp_log_buf);
va_end(args);
}
return retval;
}
int log_open(struct inode *inode, struct file *file)
{
inc_module_count();
return 0;
}
int log_release(struct inode *inode, struct file *file)
{
dec_module_count();
return 0;
}
ssize_t log_read(struct file *file, char __user *buf, size_t count,
loff_t *ppos)
{
int error, i = 0;
char c;
unsigned long flags;
if ((file->f_flags & O_NONBLOCK) && !(log_end - log_start))
return -EAGAIN;
if ((!buf) || (count < 0))
return -EINVAL;
if (count == 0)
return 0;
if (!access_ok(VERIFY_WRITE, buf, count))
return -EFAULT;
error = wait_event_interruptible(log_wait, (log_start - log_end));
if (error)
return error;
spin_lock_irqsave(&logbuf_lock, flags);
while ((!error) && (log_start != log_end) && (i < count)) {
c = LOG_BUF(log_start);
log_start++;
spin_unlock_irqrestore(&logbuf_lock, flags);
error = __put_user(c, buf);
spin_lock_irqsave(&logbuf_lock, flags);
buf++;
i++;
}
spin_unlock_irqrestore(&logbuf_lock, flags);
if (!error)
return i;
return error;
}
ssize_t log_write(struct file *file, const char __user *buf, size_t count,
loff_t *ppos)
{
return count;
}
unsigned int log_poll(struct file *file, poll_table *wait)
{
poll_wait(file, &log_wait, wait);
if (log_end - log_start)
return POLLIN | POLLRDNORM;
return 0;
}
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