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/*
* connection_list.c - ACPI daemon connection list
*
* Copyright (C) 2008, Ted Felix (www.tedfelix.com)
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Tabs at 4
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "acpid.h"
#include "log.h"
#include "connection_list.h"
#define max(a, b) (((a)>(b))?(a):(b))
/*---------------------------------------------------------------*/
/* private objects */
#define MAX_CONNECTIONS 20
static struct connection connection_list[MAX_CONNECTIONS];
static int nconnections = 0;
/* fd_set containing all the fd's that come in */
static fd_set allfds;
/* highest fd that is opened */
/* (-2 + 1) causes select() to return immediately */
static int highestfd = -2;
/*---------------------------------------------------------------*/
/* public functions */
void
add_connection(struct connection *p)
{
if (nconnections < 0)
return;
if (nconnections >= MAX_CONNECTIONS) {
acpid_log(LOG_ERR, "Too many connections.");
/* ??? This routine should return -1 in this situation so that */
/* callers can clean up any open fds and whatnot. */
return;
}
if (nconnections == 0)
FD_ZERO(&allfds);
/* add the connection to the connection list */
connection_list[nconnections] = *p;
++nconnections;
/* add to the fd set */
FD_SET(p->fd, &allfds);
highestfd = max(highestfd, p->fd);
}
/*---------------------------------------------------------------*/
void
delete_connection(int fd)
{
int i;
close(fd);
/* remove from the fd set */
FD_CLR(fd, &allfds);
for (i = 0; i < nconnections; ++i) {
/* if the file descriptors match, delete the connection */
if (connection_list[i].fd == fd) {
free(connection_list[i].pathname);
--nconnections;
connection_list[i] = connection_list[nconnections];
break;
}
}
/* prepare for recalculation of highestfd */
highestfd = -2;
/* recalculate highestfd */
for (i = 0; i < nconnections; ++i) {
highestfd = max(highestfd, connection_list[i].fd);
}
}
/*---------------------------------------------------------------*/
struct connection *
find_connection(int fd)
{
int i;
/* for each connection */
for (i = 0; i < nconnections; ++i) {
/* if the file descriptors match, return the connection */
if (connection_list[i].fd == fd)
return &connection_list[i];
}
return NULL;
}
/*---------------------------------------------------------------*/
struct connection *
find_connection_name(char *pathname)
{
int i;
/* for each connection */
for (i = 0; i < nconnections; ++i) {
/* skip null pathnames */
if (connection_list[i].pathname == NULL)
continue;
/* if the pathname matches, return the connection */
if (strcmp(connection_list[i].pathname, pathname) == 0)
return &connection_list[i];
}
return NULL;
}
/*---------------------------------------------------------------*/
int
get_number_of_connections()
{
return nconnections;
}
/*---------------------------------------------------------------*/
struct connection *
get_connection(int i)
{
if (i < 0 || i >= nconnections)
return NULL;
return &connection_list[i];
}
/*---------------------------------------------------------------*/
const fd_set *
get_fdset()
{
return &allfds;
}
/*---------------------------------------------------------------*/
int
get_highestfd()
{
return highestfd;
}
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