bandwidth-slave-many-up.c
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/*
* Copyright © 2009 Stéphane Raimbault <stephane.raimbault@gmail.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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <signal.h>
#include "modbus.h"
#define SLAVE 0x11
#define NB_CONNECTION 5
int slave_socket;
modbus_mapping_t mb_mapping;
static void close_sigint(int dummy)
{
shutdown(slave_socket, SHUT_RDWR);
close(slave_socket);
modbus_mapping_free(&mb_mapping);
exit(dummy);
}
int main(void)
{
int master_socket;
modbus_param_t mb_param;
int ret;
fd_set refset;
fd_set rdset;
/* Maximum file descriptor number */
int fdmax;
modbus_init_tcp(&mb_param, "127.0.0.1", 1502, SLAVE);
ret = modbus_mapping_new(&mb_mapping, MAX_STATUS, 0, MAX_REGISTERS, 0);
if (ret == FALSE) {
printf("Memory allocation failure\n");
exit(1);
}
slave_socket = modbus_slave_listen_tcp(&mb_param, NB_CONNECTION);
signal(SIGINT, close_sigint);
/* Clear the reference set of socket */
FD_ZERO(&refset);
/* Add the slave socket */
FD_SET(slave_socket, &refset);
/* Keep track of the max file descriptor */
fdmax = slave_socket;
for (;;) {
rdset = refset;
if (select(fdmax+1, &rdset, NULL, NULL, NULL) == -1) {
perror("Slave select() failure.");
close_sigint(1);
}
/* Run through the existing connections looking for data to be
* read */
for (master_socket = 0; master_socket <= fdmax; master_socket++) {
if (FD_ISSET(master_socket, &rdset)) {
if (master_socket == slave_socket) {
/* A client is asking a new connection */
socklen_t addrlen;
struct sockaddr_in clientaddr;
int newfd;
/* Handle new connections */
addrlen = sizeof(clientaddr);
memset(&clientaddr, 0, sizeof(clientaddr));
newfd = accept(slave_socket, (struct sockaddr *)&clientaddr, &addrlen);
if (newfd == -1) {
perror("Server accept() error");
} else {
FD_SET(newfd, &refset);
if (newfd > fdmax) {
/* Keep track of the maximum */
fdmax = newfd;
}
printf("New connection from %s:%d on socket %d\n",
inet_ntoa(clientaddr.sin_addr), clientaddr.sin_port, newfd);
}
} else {
/* An already connected master has sent a new query */
uint8_t query[MAX_MESSAGE_LENGTH];
int query_size;
ret = modbus_slave_receive(&mb_param, master_socket, query, &query_size);
if (ret == 0) {
modbus_slave_manage(&mb_param, query, query_size, &mb_mapping);
} else {
/* Connection closed by the client, end of server */
printf("Connection closed on socket %d\n", master_socket);
shutdown(master_socket, SHUT_RDWR);
close(master_socket);
/* Remove from reference set */
FD_CLR(master_socket, &refset);
if (master_socket == fdmax) {
fdmax--;
}
}
}
}
}
}
return 0;
}