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-rw-r--r--tests/bandwidth-server-many-up.c143
1 files changed, 143 insertions, 0 deletions
diff --git a/tests/bandwidth-server-many-up.c b/tests/bandwidth-server-many-up.c
new file mode 100644
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+++ b/tests/bandwidth-server-many-up.c
@@ -0,0 +1,143 @@
+/*
+ * Copyright © 2009-2010 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>
+
+#if defined(_WIN32)
+#include <ws2tcpip.h>
+#else
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#endif
+
+#define NB_CONNECTION 5
+
+modbus_t *ctx = NULL;
+int server_socket;
+modbus_mapping_t *mb_mapping;
+
+static void close_sigint(int dummy)
+{
+ close(server_socket);
+ modbus_free(ctx);
+ modbus_mapping_free(mb_mapping);
+
+ exit(dummy);
+}
+
+int main(void)
+{
+ int master_socket;
+ int rc;
+ fd_set refset;
+ fd_set rdset;
+
+ /* Maximum file descriptor number */
+ int fdmax;
+
+ ctx = modbus_new_tcp("127.0.0.1", 1502);
+
+ mb_mapping = modbus_mapping_new(MODBUS_MAX_READ_BITS, 0,
+ MODBUS_MAX_READ_REGISTERS, 0);
+ if (mb_mapping == NULL) {
+ fprintf(stderr, "Failed to allocate the mapping: %s\n",
+ modbus_strerror(errno));
+ modbus_free(ctx);
+ return -1;
+ }
+
+ server_socket = modbus_tcp_listen(ctx, NB_CONNECTION);
+
+ signal(SIGINT, close_sigint);
+
+ /* Clear the reference set of socket */
+ FD_ZERO(&refset);
+ /* Add the server socket */
+ FD_SET(server_socket, &refset);
+
+ /* Keep track of the max file descriptor */
+ fdmax = server_socket;
+
+ for (;;) {
+ rdset = refset;
+ if (select(fdmax+1, &rdset, NULL, NULL, NULL) == -1) {
+ perror("Server 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 == server_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(server_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[MODBUS_TCP_MAX_ADU_LENGTH];
+
+ modbus_set_socket(ctx, master_socket);
+ rc = modbus_receive(ctx, query);
+ if (rc != -1) {
+ modbus_reply(ctx, query, rc, mb_mapping);
+ } else {
+ /* Connection closed by the client, end of server */
+ printf("Connection closed on socket %d\n", master_socket);
+ close(master_socket);
+
+ /* Remove from reference set */
+ FD_CLR(master_socket, &refset);
+
+ if (master_socket == fdmax) {
+ fdmax--;
+ }
+ }
+ }
+ }
+ }
+ }
+
+ return 0;
+}