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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 <stdlib.h>
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#include <string.h>
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#include "acpid.h"
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#include "log.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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static int capacity = 0;
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static struct connection *connection_list = NULL;
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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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int
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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 -1;
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/* if the list is full, allocate more space */
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if (nconnections >= capacity) {
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/* no more than 1024 */
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if (capacity > 1024) {
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acpid_log(LOG_ERR, "Too many connections.");
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return -1;
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}
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/* another 20 */
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capacity += 20;
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connection_list =
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realloc(connection_list, sizeof(struct connection) * capacity);
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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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return 0;
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}
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/*---------------------------------------------------------------*/
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void
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delete_connection(int fd)
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{
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int i;
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/* close anything other than stdin/stdout/stderr */
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if (fd > 2)
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close(fd);
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/* remove from the fd set */
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FD_CLR(fd, &allfds);
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for (i = 0; i < nconnections; ++i) {
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/* if the file descriptors match, delete the connection */
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if (connection_list[i].fd == fd) {
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free(connection_list[i].pathname);
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--nconnections;
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connection_list[i] = connection_list[nconnections];
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break;
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}
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}
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/* prepare for recalculation of highestfd */
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highestfd = -2;
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/* recalculate highestfd */
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for (i = 0; i < nconnections; ++i) {
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highestfd = max(highestfd, connection_list[i].fd);
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}
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}
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/*---------------------------------------------------------------*/
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void
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delete_all_connections(void)
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{
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/* while there are still connections to delete */
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while (nconnections) {
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/* delete the connection at the end of the list */
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delete_connection(connection_list[nconnections-1].fd);
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}
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free(connection_list);
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connection_list = NULL;
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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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struct connection *
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find_connection_name(char *pathname)
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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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/* skip null pathnames */
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if (connection_list[i].pathname == NULL)
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continue;
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/* if the pathname matches, return the connection */
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if (strcmp(connection_list[i].pathname, pathname) == 0)
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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()
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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()
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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()
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{
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return highestfd;
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}
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