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-rw-r--r--libevent/devpoll.c416
1 files changed, 0 insertions, 416 deletions
diff --git a/libevent/devpoll.c b/libevent/devpoll.c
deleted file mode 100644
index db897a9..0000000
--- a/libevent/devpoll.c
+++ /dev/null
@@ -1,416 +0,0 @@
-/*
- * Copyright 2000-2004 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 <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/devpoll.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <assert.h>
-
-#include "event.h"
-#include "evsignal.h"
-#include "log.h"
-
-extern volatile sig_atomic_t evsignal_caught;
-
-/* due to limitations in the devpoll interface, we need to keep track of
- * all file descriptors outself.
- */
-struct evdevpoll {
-	struct event *evread;
-	struct event *evwrite;
-};
-
-struct devpollop {
-	struct evdevpoll *fds;
-	int nfds;
-	struct pollfd *events;
-	int nevents;
-	int dpfd;
-	struct pollfd *changes;
-	int nchanges;
-};
-
-void *devpoll_init	(void);
-int devpoll_add	(void *, struct event *);
-int devpoll_del	(void *, struct event *);
-int devpoll_recalc	(struct event_base *, void *, int);
-int devpoll_dispatch	(struct event_base *, void *, struct timeval *);
-void devpoll_dealloc	(void *);
-
-struct eventop devpollops = {
-	"devpoll",
-	devpoll_init,
-	devpoll_add,
-	devpoll_del,
-	devpoll_recalc,
-	devpoll_dispatch,
-	devpoll_dealloc
-};
-
-#define NEVENT	32000
-
-static int
-devpoll_commit(struct devpollop *devpollop)
-{
-	/*
-	 * Due to a bug in Solaris, we have to use pwrite with an offset of 0.
-	 * Write is limited to 2GB of data, until it will fail.
-	 */
-	if (pwrite(devpollop->dpfd, devpollop->changes,
-		sizeof(struct pollfd) * devpollop->nchanges, 0) == -1)
-		return(-1);
-
-	devpollop->nchanges = 0;
-	return(0);
-}
-
-static int
-devpoll_queue(struct devpollop *devpollop, int fd, int events) {
-	struct pollfd *pfd;
-
-	if (devpollop->nchanges >= devpollop->nevents) {
-		/*
-		 * Change buffer is full, must commit it to /dev/poll before 
-		 * adding more 
-		 */
-		if (devpoll_commit(devpollop) != 0)
-			return(-1);
-	}
-
-	pfd = &devpollop->changes[devpollop->nchanges++];
-	pfd->fd = fd;
-	pfd->events = events;
-	pfd->revents = 0;
-
-	return(0);
-}
-
-void *
-devpoll_init(void)
-{
-	int dpfd, nfiles = NEVENT;
-	struct rlimit rl;
-	struct devpollop *devpollop;
-
-	/* Disable devpoll when this environment variable is set */
-	if (getenv("EVENT_NODEVPOLL"))
-		return (NULL);
-
-	if (!(devpollop = calloc(1, sizeof(struct devpollop))))
-		return (NULL);
-
-	if (getrlimit(RLIMIT_NOFILE, &rl) == 0 &&
-	    rl.rlim_cur != RLIM_INFINITY)
-		nfiles = rl.rlim_cur - 1;
-
-	/* Initialize the kernel queue */
-	if ((dpfd = open("/dev/poll", O_RDWR)) == -1) {
-                event_warn("open: /dev/poll");
-		free(devpollop);
-		return (NULL);
-	}
-
-	devpollop->dpfd = dpfd;
-
-	/* Initialize fields */
-	devpollop->events = calloc(nfiles, sizeof(struct pollfd));
-	if (devpollop->events == NULL) {
-		free(devpollop);
-		close(dpfd);
-		return (NULL);
-	}
-	devpollop->nevents = nfiles;
-
-	devpollop->fds = calloc(nfiles, sizeof(struct evdevpoll));
-	if (devpollop->fds == NULL) {
-		free(devpollop->events);
-		free(devpollop);
-		close(dpfd);
-		return (NULL);
-	}
-	devpollop->nfds = nfiles;
-
-	devpollop->changes = calloc(nfiles, sizeof(struct pollfd));
-	if (devpollop->changes == NULL) {
-		free(devpollop->fds);
-		free(devpollop->events);
-		free(devpollop);
-		close(dpfd);
-		return (NULL);
-	}
-
-	evsignal_init();
-
-	return (devpollop);
-}
-
-int
-devpoll_recalc(struct event_base *base, void *arg, int max)
-{
-	struct devpollop *devpollop = arg;
-
-	if (max > devpollop->nfds) {
-		struct evdevpoll *fds;
-		int nfds;
-
-		nfds = devpollop->nfds;
-		while (nfds < max)
-			nfds <<= 1;
-
-		fds = realloc(devpollop->fds, nfds * sizeof(struct evdevpoll));
-		if (fds == NULL) {
-			event_warn("realloc");
-			return (-1);
-		}
-		devpollop->fds = fds;
-		memset(fds + devpollop->nfds, 0,
-		    (nfds - devpollop->nfds) * sizeof(struct evdevpoll));
-		devpollop->nfds = nfds;
-	}
-
-	return (0);
-}
-
-int
-devpoll_dispatch(struct event_base *base, void *arg, struct timeval *tv)
-{
-	struct devpollop *devpollop = arg;
-	struct pollfd *events = devpollop->events;
-	struct dvpoll dvp;
-	struct evdevpoll *evdp;
-	int i, res, timeout;
-
-	if (devpollop->nchanges)
-		devpoll_commit(devpollop);
-
-	timeout = tv->tv_sec * 1000 + (tv->tv_usec + 999) / 1000;
-
-	dvp.dp_fds = devpollop->events;
-	dvp.dp_nfds = devpollop->nevents;
-	dvp.dp_timeout = timeout;
-
-	res = ioctl(devpollop->dpfd, DP_POLL, &dvp);
-
-	if (res == -1) {
-		if (errno != EINTR) {
-			event_warn("ioctl: DP_POLL");
-			return (-1);
-		}
-
-		evsignal_process();
-		return (0);
-	} else if (evsignal_caught)
-		evsignal_process();
-
-	event_debug(("%s: devpoll_wait reports %d", __func__, res));
-
-	for (i = 0; i < res; i++) {
-		int which = 0;
-		int what = events[i].revents;
-		struct event *evread = NULL, *evwrite = NULL;
-
-		assert(events[i].fd < devpollop->nfds);
-		evdp = &devpollop->fds[events[i].fd];
-   
-                if (what & POLLHUP)
-                        what |= POLLIN | POLLOUT;
-                else if (what & POLLERR)
-                        what |= POLLIN | POLLOUT;
-
-		if (what & POLLIN) {
-			evread = evdp->evread;
-			which |= EV_READ;
-		}
-
-		if (what & POLLOUT) {
-			evwrite = evdp->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
-devpoll_add(void *arg, struct event *ev)
-{
-	struct devpollop *devpollop = arg;
-	struct evdevpoll *evdp;
-	int fd, events;
-
-	if (ev->ev_events & 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 & EV_READ) {
-		if (evdp->evread && evdp->evread != ev) {
-		   /* There is already a different read event registered */
-		   return(-1);
-		}
-		events |= POLLIN;
-	}
-
-	if (ev->ev_events & 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 & EV_READ)
-		evdp->evread = ev;
-	if (ev->ev_events & EV_WRITE)
-		evdp->evwrite = ev;
-
-	return (0);
-}
-
-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 & 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 & EV_READ)
-		events |= POLLIN;
-	if (ev->ev_events & 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);
-}
-
-void
-devpoll_dealloc(void *arg)
-{
-	struct devpollop *devpollop = arg;
-
-	if (devpollop->fds)
-		free(devpollop->fds);
-	if (devpollop->events)
-		free(devpollop->events);
-	if (devpollop->changes)
-		free(devpollop->changes);
-	if (devpollop->dpfd >= 0)
-		close(devpollop->dpfd);
-
-	memset(devpollop, 0, sizeof(struct devpollop));
-	free(devpollop);
-}
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