error_t
_hurd_ctty_output (io_t port, io_t ctty, error_t (*rpc) (io_t))
{
if (ctty == MACH_PORT_NULL)
return (*rpc) (port);
else
{
struct hurd_sigstate *ss = _hurd_self_sigstate ();
error_t err;
do
{
/* Don't use the ctty io port if we are blocking or ignoring
SIGTTOU. We redo this check at the top of the loop in case
the signal handler changed the state. */
__spin_lock (&ss->lock);
if (__sigismember (&ss->blocked, SIGTTOU) ||
ss->actions[SIGTTOU].sa_handler == SIG_IGN)
err = EIO;
else
err = 0;
__spin_unlock (&ss->lock);
if (err)
return (*rpc) (port);
err = (*rpc) (ctty);
if (err == EBACKGROUND)
{
if (_hurd_orphaned)
/* Our process group is orphaned, so we never generate a
signal; we just fail. */
err = EIO;
else
{
/* Send a SIGTTOU signal to our process group.
We must remember here not to clobber ERR, since
the loop condition below uses it to recall that
we should retry after a stop. */
__USEPORT (CTTYID, _hurd_sig_post (0, SIGTTOU, port));
/* XXX what to do if error here? */
/* At this point we should have just run the handler for
SIGTTOU or resumed after being stopped. Now this is
still a "system call", so check to see if we should
restart it. */
__spin_lock (&ss->lock);
if (!(ss->actions[SIGTTOU].sa_flags & SA_RESTART))
err = EINTR;
__spin_unlock (&ss->lock);
}
}
/* If the last RPC generated a SIGTTOU, loop to try it again. */
} while (err == EBACKGROUND);
return err;
}
}
error_t
_hurd_ctty_input (io_t port, io_t ctty, error_t (*rpc) (io_t))
{
error_t err;
if (ctty == MACH_PORT_NULL)
return (*rpc) (port);
do
{
err = (*rpc) (ctty);
if (err == EBACKGROUND)
{
/* We are a background job and tried to read from the tty.
We should probably get a SIGTTIN signal. */
if (_hurd_orphaned)
/* Our process group is orphaned. Don't stop; just fail. */
err = EIO;
else
{
struct hurd_sigstate *ss = _hurd_self_sigstate ();
__spin_lock (&ss->lock);
if (__sigismember (&ss->blocked, SIGTTIN) ||
ss->actions[SIGTTIN].sa_handler == SIG_IGN)
/* We are blocking or ignoring SIGTTIN. Just fail. */
err = EIO;
__spin_unlock (&ss->lock);
if (err == EBACKGROUND)
{
/* Send a SIGTTIN signal to our process group.
We must remember here not to clobber ERR, since
the loop condition below uses it to recall that
we should retry after a stop. */
__USEPORT (CTTYID, _hurd_sig_post (0, SIGTTIN, port));
/* XXX what to do if error here? */
/* At this point we should have just run the handler for
SIGTTIN or resumed after being stopped. Now this is
still a "system call", so check to see if we should
restart it. */
__spin_lock (&ss->lock);
if (!(ss->actions[SIGTTIN].sa_flags & SA_RESTART))
err = EINTR;
__spin_unlock (&ss->lock);
}
}
}
/* If the last RPC generated a SIGTTIN, loop to try it again. */
} while (err == EBACKGROUND);
return err;
}
