2011-05-13 04:54:01 +00:00
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/*-
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2017-11-27 15:37:16 +00:00
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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2011-05-13 04:54:01 +00:00
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* Copyright (c) 2011 NetApp, Inc.
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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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*
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* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Micro event library for FreeBSD, designed for a single i/o thread
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* using kqueue, and having events be persistent by default.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <assert.h>
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2017-02-14 13:35:59 +00:00
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#include <err.h>
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2011-05-13 04:54:01 +00:00
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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2017-02-14 13:35:59 +00:00
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#include <sysexits.h>
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2011-05-13 04:54:01 +00:00
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#include <unistd.h>
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#include <sys/types.h>
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2017-02-14 13:35:59 +00:00
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#ifndef WITHOUT_CAPSICUM
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#include <sys/capsicum.h>
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#endif
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2011-05-13 04:54:01 +00:00
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#include <sys/event.h>
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#include <sys/time.h>
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#include <pthread.h>
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2012-12-20 23:01:53 +00:00
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#include <pthread_np.h>
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2011-05-13 04:54:01 +00:00
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#include "mevent.h"
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#define MEVENT_MAX 64
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2014-05-05 16:30:03 +00:00
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#define MEV_ADD 1
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#define MEV_ENABLE 2
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#define MEV_DISABLE 3
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#define MEV_DEL_PENDING 4
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2011-05-13 04:54:01 +00:00
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2012-12-20 23:01:53 +00:00
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extern char *vmname;
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2011-05-13 04:54:01 +00:00
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static pthread_t mevent_tid;
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2013-09-19 04:48:26 +00:00
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static int mevent_timid = 43;
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2011-05-13 04:54:01 +00:00
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static int mevent_pipefd[2];
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static pthread_mutex_t mevent_lmutex = PTHREAD_MUTEX_INITIALIZER;
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struct mevent {
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void (*me_func)(int, enum ev_type, void *);
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2013-09-19 04:48:26 +00:00
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#define me_msecs me_fd
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2011-05-13 04:54:01 +00:00
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int me_fd;
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2013-09-19 04:48:26 +00:00
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int me_timid;
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2011-05-13 04:54:01 +00:00
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enum ev_type me_type;
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void *me_param;
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int me_cq;
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int me_state;
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int me_closefd;
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LIST_ENTRY(mevent) me_list;
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};
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static LIST_HEAD(listhead, mevent) global_head, change_head;
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static void
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mevent_qlock(void)
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{
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pthread_mutex_lock(&mevent_lmutex);
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}
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static void
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mevent_qunlock(void)
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{
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pthread_mutex_unlock(&mevent_lmutex);
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}
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static void
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mevent_pipe_read(int fd, enum ev_type type, void *param)
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{
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char buf[MEVENT_MAX];
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int status;
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/*
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* Drain the pipe read side. The fd is non-blocking so this is
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* safe to do.
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*/
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do {
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status = read(fd, buf, sizeof(buf));
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} while (status == MEVENT_MAX);
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}
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static void
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mevent_notify(void)
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{
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char c;
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/*
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* If calling from outside the i/o thread, write a byte on the
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* pipe to force the i/o thread to exit the blocking kevent call.
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*/
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if (mevent_pipefd[1] != 0 && pthread_self() != mevent_tid) {
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write(mevent_pipefd[1], &c, 1);
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}
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}
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static int
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mevent_kq_filter(struct mevent *mevp)
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{
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int retval;
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retval = 0;
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if (mevp->me_type == EVF_READ)
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retval = EVFILT_READ;
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if (mevp->me_type == EVF_WRITE)
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retval = EVFILT_WRITE;
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2013-09-19 04:48:26 +00:00
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if (mevp->me_type == EVF_TIMER)
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retval = EVFILT_TIMER;
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2013-12-28 04:01:05 +00:00
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if (mevp->me_type == EVF_SIGNAL)
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retval = EVFILT_SIGNAL;
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2011-05-13 04:54:01 +00:00
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return (retval);
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}
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static int
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mevent_kq_flags(struct mevent *mevp)
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{
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int ret;
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switch (mevp->me_state) {
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2014-05-05 16:30:03 +00:00
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case MEV_ADD:
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ret = EV_ADD; /* implicitly enabled */
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break;
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2011-05-13 04:54:01 +00:00
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case MEV_ENABLE:
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2014-05-05 16:30:03 +00:00
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ret = EV_ENABLE;
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2011-05-13 04:54:01 +00:00
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break;
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case MEV_DISABLE:
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ret = EV_DISABLE;
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break;
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case MEV_DEL_PENDING:
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ret = EV_DELETE;
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break;
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2014-05-05 16:30:03 +00:00
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default:
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assert(0);
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break;
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2011-05-13 04:54:01 +00:00
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}
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return (ret);
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}
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static int
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mevent_kq_fflags(struct mevent *mevp)
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{
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/* XXX nothing yet, perhaps EV_EOF for reads ? */
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return (0);
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}
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static int
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mevent_build(int mfd, struct kevent *kev)
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{
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struct mevent *mevp, *tmpp;
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int i;
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i = 0;
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mevent_qlock();
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LIST_FOREACH_SAFE(mevp, &change_head, me_list, tmpp) {
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if (mevp->me_closefd) {
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/*
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* A close of the file descriptor will remove the
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* event
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*/
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close(mevp->me_fd);
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} else {
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2013-09-19 04:48:26 +00:00
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if (mevp->me_type == EVF_TIMER) {
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kev[i].ident = mevp->me_timid;
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kev[i].data = mevp->me_msecs;
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} else {
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kev[i].ident = mevp->me_fd;
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kev[i].data = 0;
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}
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2011-05-13 04:54:01 +00:00
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kev[i].filter = mevent_kq_filter(mevp);
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kev[i].flags = mevent_kq_flags(mevp);
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kev[i].fflags = mevent_kq_fflags(mevp);
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kev[i].udata = mevp;
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i++;
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}
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mevp->me_cq = 0;
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LIST_REMOVE(mevp, me_list);
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if (mevp->me_state == MEV_DEL_PENDING) {
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free(mevp);
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} else {
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LIST_INSERT_HEAD(&global_head, mevp, me_list);
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}
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assert(i < MEVENT_MAX);
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}
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mevent_qunlock();
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return (i);
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}
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static void
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mevent_handle(struct kevent *kev, int numev)
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{
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struct mevent *mevp;
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int i;
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for (i = 0; i < numev; i++) {
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mevp = kev[i].udata;
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/* XXX check for EV_ERROR ? */
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(*mevp->me_func)(mevp->me_fd, mevp->me_type, mevp->me_param);
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}
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}
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struct mevent *
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2013-09-19 04:48:26 +00:00
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mevent_add(int tfd, enum ev_type type,
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2011-05-13 04:54:01 +00:00
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void (*func)(int, enum ev_type, void *), void *param)
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{
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struct mevent *lp, *mevp;
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2013-09-19 04:48:26 +00:00
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if (tfd < 0 || func == NULL) {
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2011-05-13 04:54:01 +00:00
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return (NULL);
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}
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mevp = NULL;
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mevent_qlock();
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/*
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* Verify that the fd/type tuple is not present in any list
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*/
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LIST_FOREACH(lp, &global_head, me_list) {
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2013-09-19 04:48:26 +00:00
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if (type != EVF_TIMER && lp->me_fd == tfd &&
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lp->me_type == type) {
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2011-05-13 04:54:01 +00:00
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goto exit;
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}
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}
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LIST_FOREACH(lp, &change_head, me_list) {
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2013-09-19 04:48:26 +00:00
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if (type != EVF_TIMER && lp->me_fd == tfd &&
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lp->me_type == type) {
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2011-05-13 04:54:01 +00:00
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goto exit;
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}
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}
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/*
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* Allocate an entry, populate it, and add it to the change list.
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*/
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2014-04-22 18:55:21 +00:00
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mevp = calloc(1, sizeof(struct mevent));
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2011-05-13 04:54:01 +00:00
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if (mevp == NULL) {
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goto exit;
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}
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2013-09-19 04:48:26 +00:00
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if (type == EVF_TIMER) {
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mevp->me_msecs = tfd;
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mevp->me_timid = mevent_timid++;
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} else
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mevp->me_fd = tfd;
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2011-05-13 04:54:01 +00:00
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mevp->me_type = type;
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mevp->me_func = func;
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mevp->me_param = param;
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LIST_INSERT_HEAD(&change_head, mevp, me_list);
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mevp->me_cq = 1;
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2014-05-05 16:30:03 +00:00
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mevp->me_state = MEV_ADD;
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2011-05-13 04:54:01 +00:00
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mevent_notify();
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exit:
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mevent_qunlock();
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return (mevp);
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}
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static int
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mevent_update(struct mevent *evp, int newstate)
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{
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/*
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* It's not possible to enable/disable a deleted event
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*/
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if (evp->me_state == MEV_DEL_PENDING)
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return (EINVAL);
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/*
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* No update needed if state isn't changing
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*/
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if (evp->me_state == newstate)
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return (0);
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mevent_qlock();
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evp->me_state = newstate;
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/*
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* Place the entry onto the changed list if not already there.
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*/
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if (evp->me_cq == 0) {
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evp->me_cq = 1;
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LIST_REMOVE(evp, me_list);
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LIST_INSERT_HEAD(&change_head, evp, me_list);
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mevent_notify();
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}
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mevent_qunlock();
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return (0);
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}
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int
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mevent_enable(struct mevent *evp)
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{
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return (mevent_update(evp, MEV_ENABLE));
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}
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int
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mevent_disable(struct mevent *evp)
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{
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return (mevent_update(evp, MEV_DISABLE));
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}
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static int
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mevent_delete_event(struct mevent *evp, int closefd)
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{
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mevent_qlock();
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/*
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* Place the entry onto the changed list if not already there, and
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* mark as to be deleted.
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*/
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if (evp->me_cq == 0) {
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evp->me_cq = 1;
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LIST_REMOVE(evp, me_list);
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LIST_INSERT_HEAD(&change_head, evp, me_list);
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mevent_notify();
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}
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evp->me_state = MEV_DEL_PENDING;
|
|
|
|
|
|
|
|
if (closefd)
|
|
|
|
evp->me_closefd = 1;
|
|
|
|
|
|
|
|
mevent_qunlock();
|
|
|
|
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
mevent_delete(struct mevent *evp)
|
|
|
|
{
|
|
|
|
|
|
|
|
return (mevent_delete_event(evp, 0));
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
mevent_delete_close(struct mevent *evp)
|
|
|
|
{
|
|
|
|
|
|
|
|
return (mevent_delete_event(evp, 1));
|
|
|
|
}
|
|
|
|
|
2012-12-20 23:01:53 +00:00
|
|
|
static void
|
|
|
|
mevent_set_name(void)
|
|
|
|
{
|
|
|
|
|
2013-11-06 00:25:17 +00:00
|
|
|
pthread_set_name_np(mevent_tid, "mevent");
|
2012-12-20 23:01:53 +00:00
|
|
|
}
|
|
|
|
|
2011-05-13 04:54:01 +00:00
|
|
|
void
|
|
|
|
mevent_dispatch(void)
|
|
|
|
{
|
|
|
|
struct kevent changelist[MEVENT_MAX];
|
|
|
|
struct kevent eventlist[MEVENT_MAX];
|
|
|
|
struct mevent *pipev;
|
|
|
|
int mfd;
|
|
|
|
int numev;
|
|
|
|
int ret;
|
2017-02-14 13:35:59 +00:00
|
|
|
#ifndef WITHOUT_CAPSICUM
|
|
|
|
cap_rights_t rights;
|
|
|
|
#endif
|
2011-05-13 04:54:01 +00:00
|
|
|
|
|
|
|
mevent_tid = pthread_self();
|
2012-12-20 23:01:53 +00:00
|
|
|
mevent_set_name();
|
2011-05-13 04:54:01 +00:00
|
|
|
|
|
|
|
mfd = kqueue();
|
|
|
|
assert(mfd > 0);
|
|
|
|
|
2017-02-14 13:35:59 +00:00
|
|
|
#ifndef WITHOUT_CAPSICUM
|
|
|
|
cap_rights_init(&rights, CAP_KQUEUE);
|
|
|
|
if (cap_rights_limit(mfd, &rights) == -1 && errno != ENOSYS)
|
|
|
|
errx(EX_OSERR, "Unable to apply rights for sandbox");
|
|
|
|
#endif
|
|
|
|
|
2011-05-13 04:54:01 +00:00
|
|
|
/*
|
|
|
|
* Open the pipe that will be used for other threads to force
|
|
|
|
* the blocking kqueue call to exit by writing to it. Set the
|
|
|
|
* descriptor to non-blocking.
|
|
|
|
*/
|
|
|
|
ret = pipe(mevent_pipefd);
|
|
|
|
if (ret < 0) {
|
|
|
|
perror("pipe");
|
|
|
|
exit(0);
|
|
|
|
}
|
|
|
|
|
2017-02-14 13:35:59 +00:00
|
|
|
#ifndef WITHOUT_CAPSICUM
|
|
|
|
cap_rights_init(&rights, CAP_EVENT, CAP_READ, CAP_WRITE);
|
|
|
|
if (cap_rights_limit(mevent_pipefd[0], &rights) == -1 && errno != ENOSYS)
|
|
|
|
errx(EX_OSERR, "Unable to apply rights for sandbox");
|
|
|
|
if (cap_rights_limit(mevent_pipefd[1], &rights) == -1 && errno != ENOSYS)
|
|
|
|
errx(EX_OSERR, "Unable to apply rights for sandbox");
|
|
|
|
#endif
|
|
|
|
|
2011-05-13 04:54:01 +00:00
|
|
|
/*
|
|
|
|
* Add internal event handler for the pipe write fd
|
|
|
|
*/
|
|
|
|
pipev = mevent_add(mevent_pipefd[0], EVF_READ, mevent_pipe_read, NULL);
|
|
|
|
assert(pipev != NULL);
|
|
|
|
|
|
|
|
for (;;) {
|
|
|
|
/*
|
|
|
|
* Build changelist if required.
|
|
|
|
* XXX the changelist can be put into the blocking call
|
|
|
|
* to eliminate the extra syscall. Currently better for
|
|
|
|
* debug.
|
|
|
|
*/
|
|
|
|
numev = mevent_build(mfd, changelist);
|
|
|
|
if (numev) {
|
|
|
|
ret = kevent(mfd, changelist, numev, NULL, 0, NULL);
|
|
|
|
if (ret == -1) {
|
|
|
|
perror("Error return from kevent change");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Block awaiting events
|
|
|
|
*/
|
|
|
|
ret = kevent(mfd, NULL, 0, eventlist, MEVENT_MAX, NULL);
|
2013-12-28 04:01:05 +00:00
|
|
|
if (ret == -1 && errno != EINTR) {
|
2011-05-13 04:54:01 +00:00
|
|
|
perror("Error return from kevent monitor");
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Handle reported events
|
|
|
|
*/
|
|
|
|
mevent_handle(eventlist, ret);
|
|
|
|
}
|
|
|
|
}
|