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/*
* iSCSI daemon event handler
*
* Copyright (C) 2004 Dmitry Yusupov, Alex Aizman
* Copyright (C) 2006 Mike Christie
* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
* maintained by open-iscsi@googlegroups.com
*
* Originally based on:
* (C) 2004 FUJITA Tomonori <tomof@acm.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* See the file COPYING included with this distribution for more details.
*/
#include <stdlib.h>
#include <errno.h>
#include <sys/poll.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "mgmt_ipc.h"
#include "iscsi_ipc.h"
#include "sysfs.h"
#include "iscsid.h"
#include "log.h"
#include "iscsi_ipc.h"
#include "actor.h"
#include "initiator.h"
static int reap_count;
void need_reap(void)
{
reap_count++;
}
static void reaper(void)
{
int rc;
/*
* We don't really need reap_count, but calling wait() all the
* time seems execessive.
*/
if (reap_count) {
rc = waitpid(0, NULL, WNOHANG);
if (rc > 0) {
reap_count--;
log_debug(6, "reaped pid %d, reap_count now %d",
rc, reap_count);
}
}
}
#define POLL_CTRL 0
#define POLL_IPC 1
#define POLL_ISNS 2
#define POLL_MAX 3
static int event_loop_stop;
void event_loop_exit(void)
{
event_loop_stop = 1;
}
void event_loop(struct iscsi_ipc *ipc, int control_fd, int mgmt_ipc_fd,
int isns_fd)
{
struct pollfd poll_array[POLL_MAX];
int res;
poll_array[POLL_CTRL].fd = control_fd;
poll_array[POLL_CTRL].events = POLLIN;
poll_array[POLL_IPC].fd = mgmt_ipc_fd;
poll_array[POLL_IPC].events = POLLIN;
if (isns_fd < 0)
poll_array[POLL_ISNS].fd = poll_array[POLL_ISNS].events = 0;
else {
poll_array[POLL_ISNS].fd = isns_fd;
poll_array[POLL_ISNS].events = POLLIN;
}
event_loop_stop = 0;
while (!event_loop_stop) {
res = poll(poll_array, POLL_MAX, ACTOR_RESOLUTION);
if (res > 0) {
log_debug(6, "poll result %d", res);
if (poll_array[POLL_CTRL].revents)
ipc->ctldev_handle();
if (poll_array[POLL_IPC].revents)
mgmt_ipc_handle(mgmt_ipc_fd);
if (poll_array[POLL_ISNS].revents)
isns_handle(isns_fd);
} else if (res < 0) {
if (errno == EINTR) {
log_debug(1, "event_loop interrupted");
} else {
log_error("got poll() error (%d), errno (%d), "
"exiting", res, errno);
break;
}
} else
actor_poll();
reaper();
/*
* flush sysfs cache since kernel objs may
* have changed as a result of handling op
*/
sysfs_cleanup();
}
}
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