static ssize_t isert_listen_read(struct file *filp, char __user *buf,
size_t count, loff_t *f_pos)
{
struct isert_listener_dev *dev = filp->private_data;
struct isert_conn_dev *conn_dev;
int res = 0;
char k_buff[sizeof("/dev/") + sizeof(ISER_CONN_DEV_PREFIX) + 3 + 1];
size_t to_write;
TRACE_ENTRY();
if (!have_new_connection(dev)) {
wait_for_connection:
if (filp->f_flags & O_NONBLOCK)
return -EAGAIN;
res = wait_event_freezable(dev->waitqueue,
!have_new_connection(dev));
if (res < 0)
goto out;
}
spin_lock(&dev->conn_lock);
if (list_empty(&dev->new_conn_list)) {
/* could happen if we got disconnect */
spin_unlock(&dev->conn_lock);
goto wait_for_connection;
}
conn_dev = list_first_entry(&dev->new_conn_list, struct isert_conn_dev,
conn_list_entry);
list_move(&conn_dev->conn_list_entry, &dev->curr_conn_list);
spin_unlock(&dev->conn_lock);
to_write = min_t(size_t, sizeof(k_buff), count);
res = scnprintf(k_buff, to_write, "/dev/"ISER_CONN_DEV_PREFIX"%d",
conn_dev->idx);
++res; /* copy trailing \0 as well */
if (unlikely(copy_to_user(buf, k_buff, res)))
res = -EFAULT;
out:
TRACE_EXIT_RES(res);
return res;
}
static unsigned int isert_listen_poll(struct file *filp,
struct poll_table_struct *wait)
{
struct isert_listener_dev *dev = filp->private_data;
unsigned int mask = 0;
poll_wait(filp, &dev->waitqueue, wait);
if (have_new_connection(dev))
mask |= POLLIN | POLLRDNORM;
return mask;
}
