about summary refs log tree commit diff
path: root/libevent/epoll.c
diff options
context:
space:
mode:
Diffstat (limited to 'libevent/epoll.c')
-rw-r--r--libevent/epoll.c362
1 files changed, 0 insertions, 362 deletions
diff --git a/libevent/epoll.c b/libevent/epoll.c
deleted file mode 100644
index e089e23..0000000
--- a/libevent/epoll.c
+++ /dev/null
@@ -1,362 +0,0 @@
-/*
- * Copyright 2000-2003 Niels Provos <provos@citi.umich.edu>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- *    derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include <stdint.h>
-#include <sys/types.h>
-#include <sys/resource.h>
-#ifdef HAVE_SYS_TIME_H
-#include <sys/time.h>
-#else
-#include <sys/_time.h>
-#endif
-#include <sys/queue.h>
-#include <sys/epoll.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <errno.h>
-#ifdef HAVE_FCNTL_H
-#include <fcntl.h>
-#endif
-
-#include "event.h"
-#include "evsignal.h"
-#include "log.h"
-
-extern volatile sig_atomic_t evsignal_caught;
-
-/* due to limitations in the epoll interface, we need to keep track of
- * all file descriptors outself.
- */
-struct evepoll {
-	struct event *evread;
-	struct event *evwrite;
-};
-
-struct epollop {
-	struct evepoll *fds;
-	int nfds;
-	struct epoll_event *events;
-	int nevents;
-	int epfd;
-};
-
-void *epoll_init	(void);
-int epoll_add	(void *, struct event *);
-int epoll_del	(void *, struct event *);
-int epoll_recalc	(struct event_base *, void *, int);
-int epoll_dispatch	(struct event_base *, void *, struct timeval *);
-void epoll_dealloc	(void *);
-
-struct eventop epollops = {
-	"epoll",
-	epoll_init,
-	epoll_add,
-	epoll_del,
-	epoll_recalc,
-	epoll_dispatch,
-	epoll_dealloc
-};
-
-#ifdef HAVE_SETFD
-#define FD_CLOSEONEXEC(x) do { \
-        if (fcntl(x, F_SETFD, 1) == -1) \
-                event_warn("fcntl(%d, F_SETFD)", x); \
-} while (0)
-#else
-#define FD_CLOSEONEXEC(x)
-#endif
-
-#define NEVENT	32000
-
-void *
-epoll_init(void)
-{
-	int epfd, nfiles = NEVENT;
-	struct rlimit rl;
-	struct epollop *epollop;
-
-	/* Disable epollueue when this environment variable is set */
-	if (getenv("EVENT_NOEPOLL"))
-		return (NULL);
-
-	if (getrlimit(RLIMIT_NOFILE, &rl) == 0 &&
-	    rl.rlim_cur != RLIM_INFINITY) {
-		/*
-		 * Solaris is somewhat retarded - it's important to drop
-		 * backwards compatibility when making changes.  So, don't
-		 * dare to put rl.rlim_cur here.
-		 */
-		nfiles = rl.rlim_cur - 1;
-	}
-
-	/* Initalize the kernel queue */
-
-	if ((epfd = epoll_create(nfiles)) == -1) {
-                event_warn("epoll_create");
-		return (NULL);
-	}
-
-	FD_CLOSEONEXEC(epfd);
-
-	if (!(epollop = calloc(1, sizeof(struct epollop))))
-		return (NULL);
-
-	epollop->epfd = epfd;
-
-	/* Initalize fields */
-	epollop->events = malloc(nfiles * sizeof(struct epoll_event));
-	if (epollop->events == NULL) {
-		free(epollop);
-		return (NULL);
-	}
-	epollop->nevents = nfiles;
-
-	epollop->fds = calloc(nfiles, sizeof(struct evepoll));
-	if (epollop->fds == NULL) {
-		free(epollop->events);
-		free(epollop);
-		return (NULL);
-	}
-	epollop->nfds = nfiles;
-
-	evsignal_init();
-
-	return (epollop);
-}
-
-int
-epoll_recalc(struct event_base *base, void *arg, int max)
-{
-	struct epollop *epollop = arg;
-
-	if (max > epollop->nfds) {
-		struct evepoll *fds;
-		int nfds;
-
-		nfds = epollop->nfds;
-		while (nfds < max)
-			nfds <<= 1;
-
-		fds = realloc(epollop->fds, nfds * sizeof(struct evepoll));
-		if (fds == NULL) {
-			event_warn("realloc");
-			return (-1);
-		}
-		epollop->fds = fds;
-		memset(fds + epollop->nfds, 0,
-		    (nfds - epollop->nfds) * sizeof(struct evepoll));
-		epollop->nfds = nfds;
-	}
-
-	return (0);
-}
-
-int
-epoll_dispatch(struct event_base *base, void *arg, struct timeval *tv)
-{
-	struct epollop *epollop = arg;
-	struct epoll_event *events = epollop->events;
-	struct evepoll *evep;
-	int i, res, timeout;
-
-	timeout = tv->tv_sec * 1000 + (tv->tv_usec + 999) / 1000;
-	res = epoll_wait(epollop->epfd, events, epollop->nevents, timeout);
-
-	if (res == -1) {
-		if (errno != EINTR) {
-			event_warn("epoll_wait");
-			return (-1);
-		}
-
-		evsignal_process();
-		return (0);
-	} else if (evsignal_caught)
-		evsignal_process();
-
-	event_debug(("%s: epoll_wait reports %d", __func__, res));
-
-	for (i = 0; i < res; i++) {
-		int which = 0;
-		int what = events[i].events;
-		struct event *evread = NULL, *evwrite = NULL;
-
-		evep = (struct evepoll *)events[i].data.ptr;
-   
-                if (what & EPOLLHUP)
-                        what |= EPOLLIN | EPOLLOUT;
-                else if (what & EPOLLERR)
-                        what |= EPOLLIN | EPOLLOUT;
-
-		if (what & EPOLLIN) {
-			evread = evep->evread;
-			which |= EV_READ;
-		}
-
-		if (what & EPOLLOUT) {
-			evwrite = evep->evwrite;
-			which |= EV_WRITE;
-		}
-
-		if (!which)
-			continue;
-
-		if (evread != NULL && !(evread->ev_events & EV_PERSIST))
-			event_del(evread);
-		if (evwrite != NULL && evwrite != evread &&
-		    !(evwrite->ev_events & EV_PERSIST))
-			event_del(evwrite);
-
-		if (evread != NULL)
-			event_active(evread, EV_READ, 1);
-		if (evwrite != NULL)
-			event_active(evwrite, EV_WRITE, 1);
-	}
-
-	return (0);
-}
-
-
-int
-epoll_add(void *arg, struct event *ev)
-{
-	struct epollop *epollop = arg;
-	struct epoll_event epev = {0, {0}};
-	struct evepoll *evep;
-	int fd, op, events;
-
-	if (ev->ev_events & EV_SIGNAL)
-		return (evsignal_add(ev));
-
-	fd = ev->ev_fd;
-	if (fd >= epollop->nfds) {
-		/* Extent the file descriptor array as necessary */
-		if (epoll_recalc(ev->ev_base, epollop, fd) == -1)
-			return (-1);
-	}
-	evep = &epollop->fds[fd];
-	op = EPOLL_CTL_ADD;
-	events = 0;
-	if (evep->evread != NULL) {
-		events |= EPOLLIN;
-		op = EPOLL_CTL_MOD;
-	}
-	if (evep->evwrite != NULL) {
-		events |= EPOLLOUT;
-		op = EPOLL_CTL_MOD;
-	}
-
-	if (ev->ev_events & EV_READ)
-		events |= EPOLLIN;
-	if (ev->ev_events & EV_WRITE)
-		events |= EPOLLOUT;
-
-	epev.data.ptr = evep;
-	epev.events = events;
-	if (epoll_ctl(epollop->epfd, op, ev->ev_fd, &epev) == -1)
-			return (-1);
-
-	/* Update events responsible */
-	if (ev->ev_events & EV_READ)
-		evep->evread = ev;
-	if (ev->ev_events & EV_WRITE)
-		evep->evwrite = ev;
-
-	return (0);
-}
-
-int
-epoll_del(void *arg, struct event *ev)
-{
-	struct epollop *epollop = arg;
-	struct epoll_event epev = {0, {0}};
-	struct evepoll *evep;
-	int fd, events, op;
-	int needwritedelete = 1, needreaddelete = 1;
-
-	if (ev->ev_events & EV_SIGNAL)
-		return (evsignal_del(ev));
-
-	fd = ev->ev_fd;
-	if (fd >= epollop->nfds)
-		return (0);
-	evep = &epollop->fds[fd];
-
-	op = EPOLL_CTL_DEL;
-	events = 0;
-
-	if (ev->ev_events & EV_READ)
-		events |= EPOLLIN;
-	if (ev->ev_events & EV_WRITE)
-		events |= EPOLLOUT;
-
-	if ((events & (EPOLLIN|EPOLLOUT)) != (EPOLLIN|EPOLLOUT)) {
-		if ((events & EPOLLIN) && evep->evwrite != NULL) {
-			needwritedelete = 0;
-			events = EPOLLOUT;
-			op = EPOLL_CTL_MOD;
-		} else if ((events & EPOLLOUT) && evep->evread != NULL) {
-			needreaddelete = 0;
-			events = EPOLLIN;
-			op = EPOLL_CTL_MOD;
-		}
-	}
-
-	epev.events = events;
-	epev.data.ptr = evep;
-
-	if (needreaddelete)
-		evep->evread = NULL;
-	if (needwritedelete)
-		evep->evwrite = NULL;
-
-	if (epoll_ctl(epollop->epfd, op, fd, &epev) == -1)
-		return (-1);
-
-	return (0);
-}
-
-void
-epoll_dealloc(void *arg)
-{
-	struct epollop *epollop = arg;
-
-	if (epollop->fds)
-		free(epollop->fds);
-	if (epollop->events)
-		free(epollop->events);
-	if (epollop->epfd >= 0)
-		close(epollop->epfd);
-
-	memset(epollop, 0, sizeof(struct epollop));
-	free(epollop);
-}
generated by cgit-pink 1.4.1 (git 2.36.1) at 2025-12-10 10:09:47 +0000