static ssize_t file_write(struct file *file, const char __user * buffer,
size_t count, loff_t * ppos)
{
int minor;
struct rtlx_channel *rt;
minor = iminor(file->f_path.dentry->d_inode);
rt = &rtlx->channel[minor];
/* any space left... */
if (!rtlx_write_poll(minor)) {
int ret = 0;
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
__wait_event_interruptible(channel_wqs[minor].rt_queue,
rtlx_write_poll(minor),
ret);
if (ret)
return ret;
}
return rtlx_write(minor, buffer, count);
}
static ssize_t file_write(struct file *file, const char __user * buffer,
size_t count, loff_t * ppos)
{
int minor;
struct rtlx_channel *rt;
DECLARE_WAITQUEUE(wait, current);
minor = iminor(file->f_dentry->d_inode);
rt = &rtlx->channel[minor];
/* any space left... */
if (!rtlx_write_poll(minor)) {
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
add_wait_queue(&channel_wqs[minor].rt_queue, &wait);
set_current_state(TASK_INTERRUPTIBLE);
while (!rtlx_write_poll(minor))
schedule();
set_current_state(TASK_RUNNING);
remove_wait_queue(&channel_wqs[minor].rt_queue, &wait);
}
return rtlx_write(minor, (void *)buffer, count, 1);
}
static unsigned int file_poll(struct file *file, poll_table * wait)
{
int minor = iminor(file_inode(file));
unsigned int mask = 0;
poll_wait(file, &channel_wqs[minor].rt_queue, wait);
poll_wait(file, &channel_wqs[minor].lx_queue, wait);
if (rtlx == NULL)
return 0;
/* data available to read? */
if (rtlx_read_poll(minor, 0))
mask |= POLLIN | POLLRDNORM;
/* space to write */
if (rtlx_write_poll(minor))
mask |= POLLOUT | POLLWRNORM;
return mask;
}
static unsigned int file_poll(struct file *file, poll_table * wait)
{
int minor;
unsigned int mask = 0;
minor = iminor(file->f_path.dentry->d_inode);
poll_wait(file, &channel_wqs[minor].rt_queue, wait);
poll_wait(file, &channel_wqs[minor].lx_queue, wait);
if (rtlx == NULL)
return 0;
if (rtlx_read_poll(minor, 0))
mask |= POLLIN | POLLRDNORM;
if (rtlx_write_poll(minor))
mask |= POLLOUT | POLLWRNORM;
return mask;
}
