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/* Copyright (C) 2011 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#ifdef HAVE_EPOLL_WAIT
#include <sys/epoll.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include "fdset_epoll.h"
#include "skip-list.h"
#define OS_FDS_CHUNKSIZE 8 /*!< Number of pollfd structs in a chunk. */
#define OS_FDS_KEEPCHUNKS 32 /*!< Will attempt to free memory when reached. */
struct fdset_t {
fdset_base_t _base;
int epfd;
struct epoll_event *events;
size_t nfds;
size_t reserved;
size_t polled;
};
fdset_t *fdset_epoll_new()
{
fdset_t *set = malloc(sizeof(fdset_t));
if (!set) {
return NULL;
}
/* Blank memory. */
memset(set, 0, sizeof(fdset_t));
/* Create epoll fd. */
set->epfd = epoll_create(OS_FDS_CHUNKSIZE);
return set;
}
int fdset_epoll_destroy(fdset_t * fdset)
{
if(!fdset) {
return -1;
}
/* Teardown epoll. */
close(fdset->epfd);
/* OK if NULL. */
free(fdset->events);
free(fdset);
return 0;
}
int fdset_epoll_add(fdset_t *fdset, int fd, int events)
{
if (!fdset || fd < 0 || events <= 0) {
return -1;
}
/* Realloc needed. */
if (fdset->nfds == fdset->reserved) {
const size_t chunk = OS_FDS_CHUNKSIZE;
const size_t nsize = (fdset->reserved + chunk) *
sizeof(struct epoll_event);
struct epoll_event *events_n = malloc(nsize);
if (!events_n) {
return -1;
}
/* Clear and copy old fdset data. */
memset(events_n, 0, nsize);
memcpy(events_n, fdset->events,
fdset->nfds * sizeof(struct epoll_event));
free(fdset->events);
fdset->events = events_n;
fdset->reserved += chunk;
}
/* Add to epoll set. */
struct epoll_event ev;
memset(&ev, 0, sizeof(struct epoll_event));
ev.events = EPOLLIN;
ev.data.fd = fd;
if (epoll_ctl(fdset->epfd, EPOLL_CTL_ADD, fd, &ev) < 0) {
return -1;
}
++fdset->nfds;
return 0;
}
int fdset_epoll_remove(fdset_t *fdset, int fd)
{
if (!fdset || fd < 0) {
return -1;
}
/* Attempt to remove from set. */
struct epoll_event ev;
memset(&ev, 0, sizeof(struct epoll_event));
if (epoll_ctl(fdset->epfd, EPOLL_CTL_DEL, fd, &ev) < 0) {
return -1;
}
/* Overwrite current item. */
--fdset->nfds;
/*! \todo Return memory if unused (issue #1582). */
return 0;
}
int fdset_epoll_wait(fdset_t *fdset, int timeout)
{
if (!fdset || fdset->nfds < 1 || !fdset->events) {
return -1;
}
/* Poll new events. */
fdset->polled = 0;
int nfds = epoll_wait(fdset->epfd, fdset->events, fdset->nfds, timeout);
/* Check. */
if (nfds < 0) {
return -1;
}
/* Events array is ordered from 0 to nfds. */
fdset->polled = nfds;
return nfds;
}
int fdset_epoll_begin(fdset_t *fdset, fdset_it_t *it)
{
if (!fdset || !it) {
return -1;
}
/* Find first. */
it->pos = 0;
return fdset_next(fdset, it);
}
int fdset_epoll_end(fdset_t *fdset, fdset_it_t *it)
{
if (!fdset || !it || fdset->nfds < 1) {
return -1;
}
/* Check for polled events. */
if (fdset->polled < 1) {
it->fd = -1;
it->pos = 0;
return -1;
}
/* No end found, ends on the beginning. */
size_t nid = fdset->polled - 1;
it->fd = fdset->events[nid].data.fd;
it->pos = nid;
it->events = 0;
return -1;
}
int fdset_epoll_next(fdset_t *fdset, fdset_it_t *it)
{
if (!fdset || !it || fdset->nfds < 1) {
return -1;
}
/* Check boundaries. */
if (it->pos >= fdset->polled) {
return -1;
}
/* Select next. */
size_t nid = it->pos++;
it->fd = fdset->events[nid].data.fd;
it->events = 0;
return 0;
}
const char* fdset_epoll_method()
{
return "epoll";
}
/* Package APIs. */
struct fdset_backend_t FDSET_EPOLL = {
.fdset_new = fdset_epoll_new,
.fdset_destroy = fdset_epoll_destroy,
.fdset_add = fdset_epoll_add,
.fdset_remove = fdset_epoll_remove,
.fdset_wait = fdset_epoll_wait,
.fdset_begin = fdset_epoll_begin,
.fdset_end = fdset_epoll_end,
.fdset_next = fdset_epoll_next,
.fdset_method = fdset_epoll_method
};
#endif
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