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devpoll support. weeh
svn:r116
This commit is contained in:
Niels Provos
parent
98c1426992
commit
5de7f4eea5
339
devpoll.c
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339
devpoll.c
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/*
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* Copyright 2000-2004 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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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/_time.h>
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#endif
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#include <sys/queue.h>
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#include <sys/devpoll.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 <fcntl.h>
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#include <errno.h>
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#include <err.h>
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#include <assert.h>
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#ifdef USE_LOG
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#include "log.h"
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#else
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#define LOG_DBG(x)
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#define log_error warn
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#endif
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#include "event.h"
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#include "evsignal.h"
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extern struct event_list eventqueue;
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extern volatile sig_atomic_t evsignal_caught;
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/* due to limitations in the devpoll interface, we need to keep track of
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* all file descriptors outself.
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*/
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struct evdevpoll {
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struct event *evread;
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struct event *evwrite;
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};
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struct devpollop {
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struct evdevpoll *fds;
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int nfds;
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struct pollfd *events;
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int nevents;
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int dpfd;
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sigset_t evsigmask;
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} devpollop;
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void *devpoll_init (void);
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int devpoll_add (void *, struct event *);
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int devpoll_del (void *, struct event *);
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int devpoll_recalc (void *, int);
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int devpoll_dispatch (void *, struct timeval *);
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struct eventop devpollops = {
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"devpoll",
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devpoll_init,
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devpoll_add,
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devpoll_del,
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devpoll_recalc,
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devpoll_dispatch
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};
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#define NEVENT 32000
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void *
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devpoll_init(void)
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{
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int dpfd, nfiles = NEVENT;
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struct rlimit rl;
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/* Disable devpollueue when this environment variable is set */
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if (getenv("EVENT_NODEVPOLL"))
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return (NULL);
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memset(&devpollop, 0, sizeof(devpollop));
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if (getrlimit(RLIMIT_NOFILE, &rl) == 0 &&
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rl.rlim_cur != RLIM_INFINITY)
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nfiles = rl.rlim_cur;
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/* Initalize the kernel queue */
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if ((dpfd = open("/dev/poll", O_RDWR)) == -1) {
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log_error("open: /dev/poll");
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return (NULL);
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}
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devpollop.dpfd = dpfd;
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/* Initalize fields */
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devpollop.events = malloc(nfiles * sizeof(struct pollfd));
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if (devpollop.events == NULL)
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return (NULL);
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devpollop.nevents = nfiles;
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devpollop.fds = calloc(nfiles, sizeof(struct evdevpoll));
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if (devpollop.fds == NULL) {
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free(devpollop.events);
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return (NULL);
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}
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devpollop.nfds = nfiles;
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evsignal_init(&devpollop.evsigmask);
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return (&devpollop);
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}
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int
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devpoll_recalc(void *arg, int max)
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{
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struct devpollop *devpollop = arg;
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if (max > devpollop->nfds) {
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struct evdevpoll *fds;
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int nfds;
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nfds = devpollop->nfds;
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while (nfds < max)
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nfds <<= 1;
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fds = realloc(devpollop->fds, nfds * sizeof(struct evdevpoll));
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if (fds == NULL) {
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log_error("realloc");
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return (-1);
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}
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devpollop->fds = fds;
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memset(fds + devpollop->nfds, 0,
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(nfds - devpollop->nfds) * sizeof(struct evdevpoll));
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devpollop->nfds = nfds;
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}
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return (evsignal_recalc(&devpollop->evsigmask));
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}
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int
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devpoll_dispatch(void *arg, struct timeval *tv)
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{
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struct devpollop *devpollop = arg;
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struct pollfd *events = devpollop->events;
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struct dvpoll dvp;
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struct evdevpoll *evdp;
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int i, res, timeout;
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if (evsignal_deliver(&devpollop->evsigmask) == -1)
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return (-1);
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timeout = tv->tv_sec * 1000 + tv->tv_usec / 1000;
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dvp.dp_fds = devpollop->events;
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dvp.dp_nfds = devpollop->nevents;
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dvp.dp_timeout = timeout;
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res = ioctl(devpollop->dpfd, DP_POLL, &dvp);
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if (evsignal_recalc(&devpollop->evsigmask) == -1)
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return (-1);
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if (res == -1) {
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if (errno != EINTR) {
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log_error("ioctl: DP_POLL");
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return (-1);
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}
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evsignal_process();
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return (0);
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} else if (evsignal_caught)
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evsignal_process();
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LOG_DBG((LOG_MISC, 80, "%s: devpoll_wait reports %d", __func__, res));
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for (i = 0; i < res; i++) {
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int which = 0;
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int what = events[i].revents;
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struct event *evread = NULL, *evwrite = NULL;
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assert(events[i].fd < devpollop->nfds);
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evdp = &devpollop->fds[events[i].fd];
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if (what & POLLHUP)
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what |= POLLIN | POLLOUT;
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else if (what & POLLERR)
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what |= POLLIN | POLLOUT;
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if (what & POLLIN) {
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evread = evdp->evread;
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which |= EV_READ;
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}
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if (what & POLLOUT) {
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evwrite = evdp->evwrite;
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which |= EV_WRITE;
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}
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if (!which)
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continue;
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if (evread != NULL && !(evread->ev_events & EV_PERSIST))
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event_del(evread);
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if (evwrite != NULL && evwrite != evread &&
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!(evwrite->ev_events & EV_PERSIST))
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event_del(evwrite);
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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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return (0);
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}
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int
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devpoll_add(void *arg, struct event *ev)
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{
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struct devpollop *devpollop = arg;
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struct pollfd dpev;
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struct evdevpoll *evdp;
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int fd, events;
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if (ev->ev_events & EV_SIGNAL)
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return (evsignal_add(&devpollop->evsigmask, ev));
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fd = ev->ev_fd;
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if (fd >= devpollop->nfds) {
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/* Extent the file descriptor array as necessary */
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if (devpoll_recalc(devpollop, fd) == -1)
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return (-1);
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}
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evdp = &devpollop->fds[fd];
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events = 0;
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if (evdp->evread != NULL) {
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events |= POLLIN;
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}
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if (evdp->evwrite != NULL) {
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events |= POLLOUT;
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}
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if (ev->ev_events & EV_READ)
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events |= POLLIN;
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if (ev->ev_events & EV_WRITE)
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events |= POLLOUT;
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dpev.fd = fd;
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dpev.events = events;
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dpev.revents = 0;
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if (write(devpollop->dpfd, &dpev, sizeof(dpev)) == -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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evdp->evread = ev;
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if (ev->ev_events & EV_WRITE)
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evdp->evwrite = ev;
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return (0);
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}
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int
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devpoll_del(void *arg, struct event *ev)
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{
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struct devpollop *devpollop = arg;
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struct pollfd dpev;
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struct evdevpoll *evdp;
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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(&devpollop->evsigmask, ev));
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fd = ev->ev_fd;
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if (fd >= devpollop->nfds)
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return (0);
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evdp = &devpollop->fds[fd];
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events = 0;
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if (ev->ev_events & EV_READ)
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events |= POLLIN;
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if (ev->ev_events & EV_WRITE)
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events |= POLLOUT;
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if ((events & (POLLIN|POLLOUT)) != (POLLIN|POLLOUT)) {
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if ((events & POLLIN) && evdp->evwrite != NULL) {
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needwritedelete = 0;
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events = POLLOUT;
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} else if ((events & POLLOUT) && evdp->evread != NULL) {
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needreaddelete = 0;
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events = POLLIN;
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}
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}
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dpev.fd = fd;
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dpev.events = events | POLLREMOVE;
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dpev.revents = 0;
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if (write(devpollop->dpfd, &dpev, sizeof(dpev)) == -1)
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return (-1);
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if (needreaddelete)
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evdp->evread = NULL;
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if (needwritedelete)
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evdp->evwrite = NULL;
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return (0);
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}
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