static int
devpoll_del(void *arg, struct event *ev)
{
struct devpollop *devpollop = arg;
struct evdevpoll *evdp;
int fd, events;
int needwritedelete = 1, needreaddelete = 1;
if (ev->ev_events & OPAL_EV_SIGNAL)
return (evsignal_del(ev));
fd = ev->ev_fd;
if (fd >= devpollop->nfds)
return (0);
evdp = &devpollop->fds[fd];
events = 0;
if (ev->ev_events & OPAL_EV_READ)
events |= POLLIN;
if (ev->ev_events & OPAL_EV_WRITE)
events |= POLLOUT;
/*
* The only way to remove an fd from the /dev/poll monitored set is
* to use POLLREMOVE by itself. This removes ALL events for the fd
* provided so if we care about two events and are only removing one
* we must re-add the other event after POLLREMOVE.
*/
if (devpoll_queue(devpollop, fd, POLLREMOVE) != 0)
return(-1);
if ((events & (POLLIN|POLLOUT)) != (POLLIN|POLLOUT)) {
/*
* We're not deleting all events, so we must resubmit the
* event that we are still interested in if one exists.
*/
if ((events & POLLIN) && evdp->evwrite != NULL) {
/* Deleting read, still care about write */
devpoll_queue(devpollop, fd, POLLOUT);
needwritedelete = 0;
} else if ((events & POLLOUT) && evdp->evread != NULL) {
/* Deleting write, still care about read */
devpoll_queue(devpollop, fd, POLLIN);
needreaddelete = 0;
}
}
if (needreaddelete)
evdp->evread = NULL;
if (needwritedelete)
evdp->evwrite = NULL;
return (0);
}
static int
devpoll_add(struct event_base *base, int fd, short old, short events, void *p)
{
struct devpollop *devpollop = base->evbase;
int res;
(void)p;
/*
* It's not necessary to OR the existing read/write events that we
* are currently interested in with the new event we are adding.
* The /dev/poll driver ORs any new events with the existing events
* that it has cached for the fd.
*/
res = 0;
if (events & EV_READ)
res |= POLLIN;
if (events & EV_WRITE)
res |= POLLOUT;
if (devpoll_queue(devpollop, fd, res) != 0)
return(-1);
return (0);
}
static int
devpoll_add(void *arg, struct event *ev)
{
struct devpollop *devpollop = arg;
struct evdevpoll *evdp;
int fd, events;
if (ev->ev_events & OPAL_EV_SIGNAL)
return (evsignal_add(ev));
fd = ev->ev_fd;
if (fd >= devpollop->nfds) {
/* Extend the file descriptor array as necessary */
if (devpoll_recalc(ev->ev_base, devpollop, fd) == -1)
return (-1);
}
evdp = &devpollop->fds[fd];
/*
* It's not necessary to OR the existing read/write events that we
* are currently interested in with the new event we are adding.
* The /dev/poll driver ORs any new events with the existing events
* that it has cached for the fd.
*/
events = 0;
if (ev->ev_events & OPAL_EV_READ) {
if (evdp->evread && evdp->evread != ev) {
/* There is already a different read event registered */
return(-1);
}
events |= POLLIN;
}
if (ev->ev_events & OPAL_EV_WRITE) {
if (evdp->evwrite && evdp->evwrite != ev) {
/* There is already a different write event registered */
return(-1);
}
events |= POLLOUT;
}
if (devpoll_queue(devpollop, fd, events) != 0)
return(-1);
/* Update events responsible */
if (ev->ev_events & OPAL_EV_READ)
evdp->evread = ev;
if (ev->ev_events & OPAL_EV_WRITE)
evdp->evwrite = ev;
return (0);
}
static int
devpoll_del(struct event_base *base, int fd, short old, short events, void *p)
{
struct devpollop *devpollop = base->evbase;
int res;
(void)p;
res = 0;
if (events & EV_READ)
res |= POLLIN;
if (events & EV_WRITE)
res |= POLLOUT;
/*
* The only way to remove an fd from the /dev/poll monitored set is
* to use POLLREMOVE by itself. This removes ALL events for the fd
* provided so if we care about two events and are only removing one
* we must re-add the other event after POLLREMOVE.
*/
if (devpoll_queue(devpollop, fd, POLLREMOVE) != 0)
return(-1);
if ((res & (POLLIN|POLLOUT)) != (POLLIN|POLLOUT)) {
/*
* We're not deleting all events, so we must resubmit the
* event that we are still interested in if one exists.
*/
if ((res & POLLIN) && (old & EV_WRITE)) {
/* Deleting read, still care about write */
devpoll_queue(devpollop, fd, POLLOUT);
} else if ((res & POLLOUT) && (old & EV_READ)) {
/* Deleting write, still care about read */
devpoll_queue(devpollop, fd, POLLIN);
}
}
return (0);
}