/*
delete the epoll event for given fd_event
*/
static void epoll_del_event(struct std_event_context *std_ev, struct tevent_fd *fde)
{
struct epoll_event event;
if (std_ev->epoll_fd == -1) return;
fde->additional_flags &= ~EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR;
/* if there's no epoll_event, we don't need to delete it */
if (!(fde->additional_flags & EPOLL_ADDITIONAL_FD_FLAG_HAS_EVENT)) return;
ZERO_STRUCT(event);
event.events = epoll_map_flags(fde->flags);
event.data.ptr = fde;
epoll_ctl(std_ev->epoll_fd, EPOLL_CTL_DEL, fde->fd, &event);
fde->additional_flags &= ~EPOLL_ADDITIONAL_FD_FLAG_HAS_EVENT;
}
/*
change the epoll event to the given fd_event
*/
static void epoll_mod_event(struct std_event_context *std_ev, struct tevent_fd *fde)
{
struct epoll_event event;
if (std_ev->epoll_fd == -1) return;
fde->additional_flags &= ~EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR;
ZERO_STRUCT(event);
event.events = epoll_map_flags(fde->flags);
event.data.ptr = fde;
if (epoll_ctl(std_ev->epoll_fd, EPOLL_CTL_MOD, fde->fd, &event) != 0) {
epoll_fallback_to_select(std_ev, "EPOLL_CTL_MOD failed");
}
/* only if we want to read we want to tell the event handler about errors */
if (fde->flags & TEVENT_FD_READ) {
fde->additional_flags |= EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR;
}
}
/*
delete the epoll event for given fd_event
*/
static void epoll_del_event(struct epoll_event_context *epoll_ev, struct tevent_fd *fde)
{
struct epoll_event event;
if (epoll_ev->epoll_fd == -1) return;
fde->additional_flags &= ~EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR;
/* if there's no epoll_event, we don't need to delete it */
if (!(fde->additional_flags & EPOLL_ADDITIONAL_FD_FLAG_HAS_EVENT)) return;
ZERO_STRUCT(event);
event.events = epoll_map_flags(fde->flags);
event.data.ptr = fde;
if (epoll_ctl(epoll_ev->epoll_fd, EPOLL_CTL_DEL, fde->fd, &event) != 0) {
tevent_debug(epoll_ev->ev, TEVENT_DEBUG_FATAL,
"epoll_del_event failed! probable early close bug (%s)\n",
strerror(errno));
}
fde->additional_flags &= ~EPOLL_ADDITIONAL_FD_FLAG_HAS_EVENT;
}
/*
add the epoll event to the given fd_event
*/
static void epoll_add_event(struct epoll_event_context *epoll_ev, struct tevent_fd *fde)
{
struct epoll_event event;
if (epoll_ev->epoll_fd == -1) return;
fde->additional_flags &= ~EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR;
/* if we don't want events yet, don't add an epoll_event */
if (fde->flags == 0) return;
ZERO_STRUCT(event);
event.events = epoll_map_flags(fde->flags);
event.data.ptr = fde;
if (epoll_ctl(epoll_ev->epoll_fd, EPOLL_CTL_ADD, fde->fd, &event) != 0) {
epoll_panic(epoll_ev, "EPOLL_CTL_ADD failed");
}
fde->additional_flags |= EPOLL_ADDITIONAL_FD_FLAG_HAS_EVENT;
/* only if we want to read we want to tell the event handler about errors */
if (fde->flags & TEVENT_FD_READ) {
fde->additional_flags |= EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR;
}
}
static int epoll_add_multiplex_fd(struct epoll_event_context *epoll_ev,
struct tevent_fd *add_fde)
{
struct epoll_event event;
struct tevent_fd *mpx_fde;
int ret;
/* Find the existing fde that caused the EEXIST error. */
for (mpx_fde = epoll_ev->ev->fd_events; mpx_fde; mpx_fde = mpx_fde->next) {
if (mpx_fde->fd != add_fde->fd) {
continue;
}
if (mpx_fde == add_fde) {
continue;
}
break;
}
if (mpx_fde == NULL) {
tevent_debug(epoll_ev->ev, TEVENT_DEBUG_FATAL,
"can't find multiplex fde for fd[%d]",
add_fde->fd);
return -1;
}
if (mpx_fde->additional_flags & EPOLL_ADDITIONAL_FD_FLAG_HAS_MPX) {
/* Logic error. Can't have more than 2 multiplexed fde's. */
tevent_debug(epoll_ev->ev, TEVENT_DEBUG_FATAL,
"multiplex fde for fd[%d] is already multiplexed\n",
mpx_fde->fd);
return -1;
}
/*
* The multiplex fde must have the same fd, and also
* already have an epoll event attached.
*/
if (!(mpx_fde->additional_flags & EPOLL_ADDITIONAL_FD_FLAG_HAS_EVENT)) {
/* Logic error. Can't have more than 2 multiplexed fde's. */
tevent_debug(epoll_ev->ev, TEVENT_DEBUG_FATAL,
"multiplex fde for fd[%d] has no event\n",
mpx_fde->fd);
return -1;
}
/* Modify the mpx_fde to add in the new flags. */
ZERO_STRUCT(event);
event.events = epoll_map_flags(mpx_fde->flags);
event.events |= epoll_map_flags(add_fde->flags);
event.data.ptr = mpx_fde;
ret = epoll_ctl(epoll_ev->epoll_fd, EPOLL_CTL_MOD, mpx_fde->fd, &event);
if (ret != 0 && errno == EBADF) {
tevent_debug(epoll_ev->ev, TEVENT_DEBUG_ERROR,
"EPOLL_CTL_MOD EBADF for "
"add_fde[%p] mpx_fde[%p] fd[%d] - disabling\n",
add_fde, mpx_fde, add_fde->fd);
DLIST_REMOVE(epoll_ev->ev->fd_events, mpx_fde);
mpx_fde->event_ctx = NULL;
DLIST_REMOVE(epoll_ev->ev->fd_events, add_fde);
add_fde->event_ctx = NULL;
return 0;
} else if (ret != 0) {
return ret;
}
/*
* Make each fde->additional_data pointers point at each other
* so we can look them up from each other. They are now paired.
*/
mpx_fde->additional_data = (struct tevent_fd *)add_fde;
add_fde->additional_data = (struct tevent_fd *)mpx_fde;
/* Now flag both fde's as being multiplexed. */
mpx_fde->additional_flags |= EPOLL_ADDITIONAL_FD_FLAG_HAS_MPX;
add_fde->additional_flags |= EPOLL_ADDITIONAL_FD_FLAG_HAS_MPX;
/* we need to keep the GOT_ERROR flag */
if (mpx_fde->additional_flags & EPOLL_ADDITIONAL_FD_FLAG_GOT_ERROR) {
add_fde->additional_flags |= EPOLL_ADDITIONAL_FD_FLAG_GOT_ERROR;
}
return 0;
}
fde->additional_flags &= ~EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR;
if (fde->additional_flags & EPOLL_ADDITIONAL_FD_FLAG_HAS_MPX) {
/*
* This is a multiplexed fde, we need to include both
* flags in the modified event.
*/
mpx_fde = talloc_get_type_abort(fde->additional_data,
struct tevent_fd);
mpx_fde->additional_flags &= ~EPOLL_ADDITIONAL_FD_FLAG_HAS_EVENT;
mpx_fde->additional_flags &= ~EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR;
}
ZERO_STRUCT(event);
event.events = epoll_map_flags(fde->flags);
if (mpx_fde != NULL) {
event.events |= epoll_map_flags(mpx_fde->flags);
}
event.data.ptr = fde;
ret = epoll_ctl(epoll_ev->epoll_fd, EPOLL_CTL_ADD, fde->fd, &event);
if (ret != 0 && errno == EBADF) {
tevent_debug(epoll_ev->ev, TEVENT_DEBUG_ERROR,
"EPOLL_CTL_ADD EBADF for "
"fde[%p] mpx_fde[%p] fd[%d] - disabling\n",
fde, mpx_fde, fde->fd);
DLIST_REMOVE(epoll_ev->ev->fd_events, fde);
fde->event_ctx = NULL;
if (mpx_fde != NULL) {
DLIST_REMOVE(epoll_ev->ev->fd_events, mpx_fde);
mpx_fde->event_ctx = NULL;