Main

Central_Control_Board/Networking.c

+#include "JaeYukBookkom.h"
+#include <arpa/inet.h>
+#include<stdlib.h>
+#include<stdio.h>
+#include<string.h>
+void ServerInit(int *serv_sock, int port);
+int max(int *list, int length);
+void error_handling(char *message);
+
+int clnt_sock[MAX_CONNECT_BOARD];
+int serv_sock = -1, max_fd;
+fd_set clients_socket, clients;
+
+void ServerInit(int *serv_sock, int port){
+    for (int i = 0; i < MAX_CONNECT_BOARD; i++){
+        clnt_sock[i] = -1;
+    }
+    struct sockaddr_in serv_addr;
+    struct sockaddr_in clnt_addr[MAX_CONNECT_BOARD];
+    socklen_t clnt_addr_size;
+    *serv_sock = socket(PF_INET, SOCK_STREAM, 0);
+    if (*serv_sock == -1)
+        error_handling("socket() error");
+
+    memset(&serv_addr, 0, sizeof(serv_addr));
+    serv_addr.sin_family = AF_INET;
+    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
+    serv_addr.sin_port = htons(port);
+
+    if (bind(*serv_sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) == -1)
+        error_handling("bind() error");
+
+    if (listen(*serv_sock, 5) == -1)
+        error_handling("listen() error");
+    for (int i = 0; i < MAX_CONNECT_BOARD; i++){
+        if (clnt_sock[i] < 0){
+            clnt_addr_size = sizeof(clnt_addr[i]);
+            clnt_sock[i] =
+                accept(*serv_sock, (struct sockaddr *)&clnt_addr[i], &clnt_addr_size);
+            if (clnt_sock[i] == -1)
+                error_handling("accept() error");
+        }
+        printf("Connection established with client %d\n",i);
+    }
+    printf("Connection End\n");
+
+    FD_ZERO(&clients_socket);
+    for (int i = 0; i < MAX_CONNECT_BOARD; i++){
+        FD_SET(clnt_sock[i], &clients_socket);
+    }
+    
+    max_fd = max(clnt_sock, MAX_CONNECT_BOARD);
+}
+int max(int *list, int length){
+    int temp = list[0];
+    for (int i = 1; i < length; i++){
+        if (list[i - 1] < list[i])
+            temp = list[i];
+    }
+    return temp;
+}
+void error_handling(char *message){
+    fputs(message, stderr);
+    fputc('\n', stderr);
+    exit(1);
+}