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/*
* (C) 2006 by Pablo Neira Ayuso <pablo@netfilter.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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <unistd.h>
#include <stdlib.h>
#include "linux_list.h"
#include "conntrackd.h"
#include "alarm.h"
#include "jhash.h"
#include <pthread.h>
#include <time.h>
#include <errno.h>
/* alarm cascade */
#define ALARM_CASCADE_SIZE 10
static struct list_head *alarm_cascade;
/* thread stuff */
static pthread_t alarm_thread;
struct alarm_list *create_alarm()
{
return (struct alarm_list *) malloc(sizeof(struct alarm_list));
}
void destroy_alarm(struct alarm_list *t)
{
free(t);
}
void set_alarm_expiration(struct alarm_list *t, unsigned long expires)
{
t->expires = expires;
}
void set_alarm_function(struct alarm_list *t,
void (*fcn)(struct alarm_list *a, void *data))
{
t->function = fcn;
}
void set_alarm_data(struct alarm_list *t, void *data)
{
t->data = data;
}
void init_alarm(struct alarm_list *t)
{
INIT_LIST_HEAD(&t->head);
t->expires = 0;
t->data = 0;
t->function = NULL;
}
void add_alarm(struct alarm_list *alarm)
{
unsigned int pos = jhash(alarm, sizeof(alarm), 0) % ALARM_CASCADE_SIZE;
list_add(&alarm->head, &alarm_cascade[pos]);
}
void del_alarm(struct alarm_list *alarm)
{
list_del(&alarm->head);
}
int mod_alarm(struct alarm_list *alarm, unsigned long expires)
{
alarm->expires = expires;
return 0;
}
void __run_alarms()
{
struct list_head *i, *tmp;
struct alarm_list *t;
struct timespec req = {0, 1000000000 / ALARM_CASCADE_SIZE};
struct timespec rem;
static int step = 0;
retry:
if (nanosleep(&req, &rem) == -1) {
/* interrupted syscall: retry with remaining time */
if (errno == EINTR) {
memcpy(&req, &rem, sizeof(struct timespec));
goto retry;
}
}
lock();
list_for_each_safe(i, tmp, &alarm_cascade[step]) {
t = (struct alarm_list *) i;
t->expires--;
if (t->expires == 0)
t->function(t, t->data);
}
step = (step + 1) < ALARM_CASCADE_SIZE ? step + 1 : 0;
unlock();
}
void *run_alarms(void *foo)
{
while(1)
__run_alarms();
}
int create_alarm_thread()
{
int i;
alarm_cascade = malloc(sizeof(struct list_head) * ALARM_CASCADE_SIZE);
if (alarm_cascade == NULL)
return -1;
for (i=0; i<ALARM_CASCADE_SIZE; i++)
INIT_LIST_HEAD(&alarm_cascade[i]);
return pthread_create(&alarm_thread, NULL, run_alarms, NULL);
}
int destroy_alarm_thread()
{
return pthread_cancel(alarm_thread);
}
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