Blame kacpimon/connection_list.c.kacpimon-dynamic-connections

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/*
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 *  connection_list.c - ACPI daemon connection list
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 *
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 *  Copyright (C) 2008, Ted Felix (www.tedfelix.com)
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 *
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 *  This program is free software; you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation; either version 2 of the License, or
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 *  (at your option) any later version.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program; if not, write to the Free Software
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 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 *  Tabs at 4
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 */
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#include <unistd.h>
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#include <stdio.h>
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#include "connection_list.h"
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#define max(a, b)  (((a)>(b))?(a):(b))
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/*---------------------------------------------------------------*/
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/* private objects */
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#define MAX_CONNECTIONS 20
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static struct connection connection_list[MAX_CONNECTIONS];
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static int nconnections = 0;
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/* fd_set containing all the fd's that come in */
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static fd_set allfds;
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/* highest fd that is opened */
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/* (-2 + 1) causes select() to return immediately */
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static int highestfd = -2;
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/*---------------------------------------------------------------*/
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/* public functions */
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void
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add_connection(struct connection *p)
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{
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	if (nconnections < 0)
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		return;
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	if (nconnections >= MAX_CONNECTIONS) {
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		printf("add_connection(): Too many connections.\n");
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		return;
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	}
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	if (nconnections == 0)
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		FD_ZERO(&allfds);
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	/* add the connection to the connection list */
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	connection_list[nconnections] = *p;
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	++nconnections;
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	/* add to the fd set */
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	FD_SET(p->fd, &allfds);
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	highestfd = max(highestfd, p->fd);
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}
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/*---------------------------------------------------------------*/
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struct connection *
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find_connection(int fd)
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{
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	int i;
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	/* for each connection */
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	for (i = 0; i < nconnections; ++i) {
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		/* if the file descriptors match, return the connection */
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		if (connection_list[i].fd == fd)
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			return &connection_list[i];
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	}
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	return NULL;
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}
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/*---------------------------------------------------------------*/
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int 
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get_number_of_connections(void)
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{
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	return nconnections;
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}
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/*---------------------------------------------------------------*/
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struct connection *
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get_connection(int i)
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{
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	if (i < 0  ||  i >= nconnections)
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		return NULL;
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	return &connection_list[i];
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}
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/*---------------------------------------------------------------*/
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const fd_set *
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get_fdset(void)
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{
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	return &allfds;
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}
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/*---------------------------------------------------------------*/
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int
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get_highestfd(void)
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{
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	return highestfd;
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}