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376
TMessagesProj/jni/voip/webrtc/base/third_party/libevent/epoll.c
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376
TMessagesProj/jni/voip/webrtc/base/third_party/libevent/epoll.c
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/*
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* Copyright 2000-2003 Niels Provos <provos@citi.umich.edu>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/resource.h>
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#else
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#include <sys/_libevent_time.h>
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#endif
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#include <sys/queue.h>
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#include <sys/epoll.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#include "event.h"
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#include "event-internal.h"
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#include "evsignal.h"
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#include "log.h"
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/* due to limitations in the epoll interface, we need to keep track of
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* all file descriptors outself.
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*/
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struct evepoll {
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struct event *evread;
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struct event *evwrite;
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};
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struct epollop {
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struct evepoll *fds;
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int nfds;
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struct epoll_event *events;
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int nevents;
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int epfd;
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};
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static void *epoll_init (struct event_base *);
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static int epoll_add (void *, struct event *);
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static int epoll_del (void *, struct event *);
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static int epoll_dispatch (struct event_base *, void *, struct timeval *);
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static void epoll_dealloc (struct event_base *, void *);
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const struct eventop epollops = {
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"epoll",
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epoll_init,
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epoll_add,
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epoll_del,
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epoll_dispatch,
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epoll_dealloc,
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1 /* need reinit */
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};
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#ifdef HAVE_SETFD
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#define FD_CLOSEONEXEC(x) do { \
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if (fcntl(x, F_SETFD, 1) == -1) \
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event_warn("fcntl(%d, F_SETFD)", x); \
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} while (0)
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#else
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#define FD_CLOSEONEXEC(x)
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#endif
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/* On Linux kernels at least up to 2.6.24.4, epoll can't handle timeout
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* values bigger than (LONG_MAX - 999ULL)/HZ. HZ in the wild can be
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* as big as 1000, and LONG_MAX can be as small as (1<<31)-1, so the
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* largest number of msec we can support here is 2147482. Let's
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* round that down by 47 seconds.
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*/
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#define MAX_EPOLL_TIMEOUT_MSEC (35*60*1000)
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#define INITIAL_NFILES 32
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#define INITIAL_NEVENTS 32
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#define MAX_NEVENTS 4096
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static void *
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epoll_init(struct event_base *base)
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{
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int epfd;
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struct epollop *epollop;
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/* Disable epollueue when this environment variable is set */
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if (evutil_getenv("EVENT_NOEPOLL"))
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return (NULL);
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/* Initalize the kernel queue */
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if ((epfd = epoll_create(32000)) == -1) {
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if (errno != ENOSYS)
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event_warn("epoll_create");
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return (NULL);
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}
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FD_CLOSEONEXEC(epfd);
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if (!(epollop = calloc(1, sizeof(struct epollop))))
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return (NULL);
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epollop->epfd = epfd;
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/* Initalize fields */
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epollop->events = malloc(INITIAL_NEVENTS * sizeof(struct epoll_event));
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if (epollop->events == NULL) {
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free(epollop);
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return (NULL);
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}
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epollop->nevents = INITIAL_NEVENTS;
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epollop->fds = calloc(INITIAL_NFILES, sizeof(struct evepoll));
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if (epollop->fds == NULL) {
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free(epollop->events);
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free(epollop);
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return (NULL);
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}
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epollop->nfds = INITIAL_NFILES;
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evsignal_init(base);
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return (epollop);
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}
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static int
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epoll_recalc(struct event_base *base, void *arg, int max)
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{
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struct epollop *epollop = arg;
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if (max >= epollop->nfds) {
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struct evepoll *fds;
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int nfds;
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nfds = epollop->nfds;
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while (nfds <= max)
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nfds <<= 1;
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fds = realloc(epollop->fds, nfds * sizeof(struct evepoll));
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if (fds == NULL) {
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event_warn("realloc");
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return (-1);
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}
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epollop->fds = fds;
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memset(fds + epollop->nfds, 0,
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(nfds - epollop->nfds) * sizeof(struct evepoll));
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epollop->nfds = nfds;
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}
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return (0);
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}
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static int
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epoll_dispatch(struct event_base *base, void *arg, struct timeval *tv)
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{
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struct epollop *epollop = arg;
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struct epoll_event *events = epollop->events;
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struct evepoll *evep;
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int i, res, timeout = -1;
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if (tv != NULL)
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timeout = tv->tv_sec * 1000 + (tv->tv_usec + 999) / 1000;
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if (timeout > MAX_EPOLL_TIMEOUT_MSEC) {
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/* Linux kernels can wait forever if the timeout is too big;
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* see comment on MAX_EPOLL_TIMEOUT_MSEC. */
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timeout = MAX_EPOLL_TIMEOUT_MSEC;
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}
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res = epoll_wait(epollop->epfd, events, epollop->nevents, timeout);
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if (res == -1) {
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if (errno != EINTR) {
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event_warn("epoll_wait");
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return (-1);
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}
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evsignal_process(base);
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return (0);
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} else if (base->sig.evsignal_caught) {
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evsignal_process(base);
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}
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event_debug(("%s: epoll_wait reports %d", __func__, res));
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for (i = 0; i < res; i++) {
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int what = events[i].events;
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struct event *evread = NULL, *evwrite = NULL;
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int fd = events[i].data.fd;
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if (fd < 0 || fd >= epollop->nfds)
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continue;
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evep = &epollop->fds[fd];
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if (what & (EPOLLHUP|EPOLLERR)) {
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evread = evep->evread;
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evwrite = evep->evwrite;
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} else {
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if (what & EPOLLIN) {
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evread = evep->evread;
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}
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if (what & EPOLLOUT) {
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evwrite = evep->evwrite;
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}
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}
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if (!(evread||evwrite))
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continue;
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if (evread != NULL)
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event_active(evread, EV_READ, 1);
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if (evwrite != NULL)
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event_active(evwrite, EV_WRITE, 1);
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}
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if (res == epollop->nevents && epollop->nevents < MAX_NEVENTS) {
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/* We used all of the event space this time. We should
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be ready for more events next time. */
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int new_nevents = epollop->nevents * 2;
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struct epoll_event *new_events;
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new_events = realloc(epollop->events,
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new_nevents * sizeof(struct epoll_event));
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if (new_events) {
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epollop->events = new_events;
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epollop->nevents = new_nevents;
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}
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}
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return (0);
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}
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static int
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epoll_add(void *arg, struct event *ev)
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{
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struct epollop *epollop = arg;
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struct epoll_event epev = {0, {0}};
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struct evepoll *evep;
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int fd, op, events;
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if (ev->ev_events & EV_SIGNAL)
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return (evsignal_add(ev));
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fd = ev->ev_fd;
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if (fd >= epollop->nfds) {
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/* Extent the file descriptor array as necessary */
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if (epoll_recalc(ev->ev_base, epollop, fd) == -1)
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return (-1);
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}
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evep = &epollop->fds[fd];
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op = EPOLL_CTL_ADD;
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events = 0;
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if (evep->evread != NULL) {
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events |= EPOLLIN;
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op = EPOLL_CTL_MOD;
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}
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if (evep->evwrite != NULL) {
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events |= EPOLLOUT;
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op = EPOLL_CTL_MOD;
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}
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if (ev->ev_events & EV_READ)
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events |= EPOLLIN;
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if (ev->ev_events & EV_WRITE)
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events |= EPOLLOUT;
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epev.data.fd = fd;
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epev.events = events;
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if (epoll_ctl(epollop->epfd, op, ev->ev_fd, &epev) == -1)
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return (-1);
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/* Update events responsible */
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if (ev->ev_events & EV_READ)
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evep->evread = ev;
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if (ev->ev_events & EV_WRITE)
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evep->evwrite = ev;
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return (0);
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}
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static int
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epoll_del(void *arg, struct event *ev)
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{
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struct epollop *epollop = arg;
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struct epoll_event epev = {0, {0}};
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struct evepoll *evep;
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int fd, events, op;
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int needwritedelete = 1, needreaddelete = 1;
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if (ev->ev_events & EV_SIGNAL)
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return (evsignal_del(ev));
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fd = ev->ev_fd;
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if (fd >= epollop->nfds)
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return (0);
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evep = &epollop->fds[fd];
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op = EPOLL_CTL_DEL;
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events = 0;
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if (ev->ev_events & EV_READ)
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events |= EPOLLIN;
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if (ev->ev_events & EV_WRITE)
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events |= EPOLLOUT;
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if ((events & (EPOLLIN|EPOLLOUT)) != (EPOLLIN|EPOLLOUT)) {
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if ((events & EPOLLIN) && evep->evwrite != NULL) {
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needwritedelete = 0;
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events = EPOLLOUT;
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op = EPOLL_CTL_MOD;
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} else if ((events & EPOLLOUT) && evep->evread != NULL) {
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needreaddelete = 0;
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events = EPOLLIN;
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op = EPOLL_CTL_MOD;
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}
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}
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epev.events = events;
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epev.data.fd = fd;
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if (needreaddelete)
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evep->evread = NULL;
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if (needwritedelete)
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evep->evwrite = NULL;
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if (epoll_ctl(epollop->epfd, op, fd, &epev) == -1)
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return (-1);
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return (0);
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}
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static void
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epoll_dealloc(struct event_base *base, void *arg)
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{
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struct epollop *epollop = arg;
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evsignal_dealloc(base);
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if (epollop->fds)
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free(epollop->fds);
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if (epollop->events)
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free(epollop->events);
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if (epollop->epfd >= 0)
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close(epollop->epfd);
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memset(epollop, 0, sizeof(struct epollop));
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free(epollop);
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}
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