inline
bool sock_writable(int sock, long seconds = 0, long milliseconds = 0)
{
udp_sock s(sock);
return sock_writable(s, seconds, milliseconds);
}
bool connected()
{
return sock_writable(sock);
}
static int exa_select(struct exa_select *sel)
{
int i;
int one=0;
int ret = -EFAULT;
/* first phase register on each queue */
for (i = 0; i < __FD_SETSIZE; i++)
{
__FD_CLR(i, &sel->result);
if (__FD_ISSET(i, &sel->select))
{
sel->elt[i].socket = exa_getsock(i);
if (sel->elt[i].socket == NULL)
{
ret = -EINVAL;
continue;
}
set_callbacks(sel->elt[i].socket, &sel->elt[i]);
if (sel->operation == EXA_SELECT_IN)
{
if (sock_readable(sel->elt[i].socket) == 1)
one = 1;
}
if (sel->operation == EXA_SELECT_OUT)
if (sock_writable(sel->elt[i].socket) == 1)
one = 1;
}
}
/* second phase : check if nothing arrived and wait if nothing arrived */
if (one==0)
{
int timeout = SELECT_TIMEOUT ;
set_current_state(TASK_INTERRUPTIBLE);
for (i = 0; i < __FD_SETSIZE; i++)
{
if (__FD_ISSET(i, &sel->select) && (sel->elt[i].socket != NULL))
{
if (sel->operation == EXA_SELECT_IN)
{
if (sock_readable(sel->elt[i].socket) == 1)
one = 1;
}
if (sel->operation == EXA_SELECT_OUT)
{
if (sock_writable(sel->elt[i].socket) == 1)
one = 1;
}
}
}
if (one == 0) /* if some data already pending, we must not wait (or some race can occur)*/
timeout = schedule_timeout(timeout);
set_current_state(TASK_RUNNING);
}
/* third : find wich socket receive/sent something */
for (i = __FD_SETSIZE - 1; i >= 0; i--)
{
if (__FD_ISSET(i, &sel->select))
{
if (sel->elt[i].socket == NULL)
continue;
if (sel->operation == EXA_SELECT_IN)
{
if (sock_readable(sel->elt[i].socket) == 1)
__FD_SET(i, &sel->result);
}
if (sel->operation == EXA_SELECT_OUT)
{
if (sock_writable(sel->elt[i].socket) == 1)
__FD_SET(i, &sel->result);
}
if ((__FD_ISSET(i, &sel->result)) && (ret == -EFAULT))
ret = 0;
restore_callbacks(sel->elt[i].socket, &sel->elt[i]);
fput(sel->elt[i].socket->file);
sel->elt[i].socket = NULL;
}
}
/* XXX this is not an error, -EFAULT is used here as the timeout return
* value....
* FIXME use ETIME to have an explicit timeout. */
if (ret == -EFAULT)
__FD_ZERO(&sel->result);
return ret;
}
