2a4b1227d9
This commit was SVN r22638.
431 строка
10 KiB
C
431 строка
10 KiB
C
/*
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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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#include "opal_config.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/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 <assert.h>
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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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#include "opal/threads/mutex.h"
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extern opal_mutex_t opal_event_lock;
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extern volatile sig_atomic_t opal_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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struct pollfd *changes;
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int nchanges;
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};
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static void *devpoll_init (struct event_base *);
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static int devpoll_add (void *, struct event *);
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static int devpoll_del (void *, struct event *);
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static int devpoll_dispatch (struct event_base *, void *, struct timeval *);
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static void devpoll_dealloc (struct event_base *, void *);
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const 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_dispatch,
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devpoll_dealloc,
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1 /* need reinit */
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};
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#define NEVENT 32000
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static int
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devpoll_commit(struct devpollop *devpollop)
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{
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/*
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* Due to a bug in Solaris, we have to use pwrite with an offset of 0.
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* Write is limited to 2GB of data, until it will fail.
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*/
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if (pwrite(devpollop->dpfd, devpollop->changes,
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sizeof(struct pollfd) * devpollop->nchanges, 0) == -1)
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return(-1);
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devpollop->nchanges = 0;
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return(0);
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}
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static int
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devpoll_queue(struct devpollop *devpollop, int fd, int events) {
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struct pollfd *pfd;
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if (devpollop->nchanges >= devpollop->nevents) {
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/*
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* Change buffer is full, must commit it to /dev/poll before
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* adding more
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*/
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if (devpoll_commit(devpollop) != 0)
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return(-1);
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}
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pfd = &devpollop->changes[devpollop->nchanges++];
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pfd->fd = fd;
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pfd->events = events;
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pfd->revents = 0;
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return(0);
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}
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static void *
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devpoll_init(struct event_base *base)
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{
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int dpfd, nfiles = NEVENT;
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struct rlimit rl;
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struct devpollop *devpollop;
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/* Disable devpoll when this environment variable is set */
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if (evutil_getenv("EVENT_NODEVPOLL"))
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return (NULL);
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if (!(devpollop = calloc(1, sizeof(struct devpollop))))
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return (NULL);
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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 - 1;
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/* Initialize the kernel queue */
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if ((dpfd = open("/dev/poll", O_RDWR)) == -1) {
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event_warn("open: /dev/poll");
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free(devpollop);
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return (NULL);
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}
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devpollop->dpfd = dpfd;
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/* Initialize fields */
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devpollop->events = calloc(nfiles, sizeof(struct pollfd));
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if (devpollop->events == NULL) {
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free(devpollop);
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close(dpfd);
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return (NULL);
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}
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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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free(devpollop);
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close(dpfd);
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return (NULL);
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}
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devpollop->nfds = nfiles;
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devpollop->changes = calloc(nfiles, sizeof(struct pollfd));
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if (devpollop->changes == NULL) {
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free(devpollop->fds);
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free(devpollop->events);
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free(devpollop);
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close(dpfd);
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return (NULL);
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}
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evsignal_init(base);
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return (devpollop);
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}
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static int
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devpoll_recalc(struct event_base *base, 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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event_warn("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 (0);
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}
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static int
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devpoll_dispatch(struct event_base *base, 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 = -1;
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if (devpollop->nchanges)
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devpoll_commit(devpollop);
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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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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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/* we should release the lock if we're going to enter the
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kernel in a multi-threaded application. However, if we're
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single threaded, there's really no advantage to releasing
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the lock and it just takes up time we could spend doing
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something else. */
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OPAL_THREAD_UNLOCK(&opal_event_lock);
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res = ioctl(devpollop->dpfd, DP_POLL, &dvp);
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OPAL_THREAD_LOCK(&opal_event_lock);
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if (res == -1) {
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if (errno != EINTR) {
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event_warn("ioctl: DP_POLL");
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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: 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 |= OPAL_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 |= OPAL_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 & OPAL_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 & OPAL_EV_PERSIST))
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event_del(evwrite);
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if (evread != NULL)
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event_active(evread, OPAL_EV_READ, 1);
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if (evwrite != NULL)
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event_active(evwrite, OPAL_EV_WRITE, 1);
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}
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return (0);
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}
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static 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 evdevpoll *evdp;
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int fd, events;
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if (ev->ev_events & OPAL_EV_SIGNAL)
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return (evsignal_add(ev));
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fd = ev->ev_fd;
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if (fd >= devpollop->nfds) {
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/* Extend the file descriptor array as necessary */
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if (devpoll_recalc(ev->ev_base, 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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/*
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* It's not necessary to OR the existing read/write events that we
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* are currently interested in with the new event we are adding.
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* The /dev/poll driver ORs any new events with the existing events
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* that it has cached for the fd.
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*/
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events = 0;
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if (ev->ev_events & OPAL_EV_READ) {
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if (evdp->evread && evdp->evread != ev) {
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/* There is already a different read event registered */
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return(-1);
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}
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events |= POLLIN;
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}
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if (ev->ev_events & OPAL_EV_WRITE) {
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if (evdp->evwrite && evdp->evwrite != ev) {
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/* There is already a different write event registered */
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return(-1);
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}
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events |= POLLOUT;
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}
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if (devpoll_queue(devpollop, fd, events) != 0)
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return(-1);
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/* Update events responsible */
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if (ev->ev_events & OPAL_EV_READ)
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evdp->evread = ev;
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if (ev->ev_events & OPAL_EV_WRITE)
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evdp->evwrite = ev;
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return (0);
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}
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static 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 evdevpoll *evdp;
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int fd, events;
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int needwritedelete = 1, needreaddelete = 1;
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if (ev->ev_events & OPAL_EV_SIGNAL)
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return (evsignal_del(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 & OPAL_EV_READ)
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events |= POLLIN;
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if (ev->ev_events & OPAL_EV_WRITE)
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events |= POLLOUT;
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/*
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* The only way to remove an fd from the /dev/poll monitored set is
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* to use POLLREMOVE by itself. This removes ALL events for the fd
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* provided so if we care about two events and are only removing one
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* we must re-add the other event after POLLREMOVE.
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*/
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if (devpoll_queue(devpollop, fd, POLLREMOVE) != 0)
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return(-1);
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if ((events & (POLLIN|POLLOUT)) != (POLLIN|POLLOUT)) {
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/*
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* We're not deleting all events, so we must resubmit the
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* event that we are still interested in if one exists.
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*/
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if ((events & POLLIN) && evdp->evwrite != NULL) {
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/* Deleting read, still care about write */
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devpoll_queue(devpollop, fd, POLLOUT);
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needwritedelete = 0;
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} else if ((events & POLLOUT) && evdp->evread != NULL) {
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/* Deleting write, still care about read */
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devpoll_queue(devpollop, fd, POLLIN);
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needreaddelete = 0;
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}
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}
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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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static void
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devpoll_dealloc(struct event_base *base, void *arg)
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{
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struct devpollop *devpollop = arg;
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evsignal_dealloc(base);
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if (devpollop->fds)
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free(devpollop->fds);
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if (devpollop->events)
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free(devpollop->events);
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if (devpollop->changes)
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free(devpollop->changes);
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if (devpollop->dpfd >= 0)
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close(devpollop->dpfd);
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memset(devpollop, 0, sizeof(struct devpollop));
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free(devpollop);
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}
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