Rewrite program using POSIX threads rather than fork

#include "tictactoe_constants.h"

int main(int argc, char **argv) { pid_t err; int serv_sock, client_sock, portno, turn = 1; socklen_t clientaddr; char buffer[512], child[30], user[15]; struct sockaddr_in serv_addr, cli_addr; //server address, client address if (argc < 2) // to check the login process { cout << "Port is not provided." << endl; exit(1); }

serv_sock = socket(AF_INET, SOCK_STREAM, 0); if (serv_sock < 0) { cout << "Error opening socket" << endl; exit(2); }

memset(&serv_addr, 0, sizeof(serv_addr)); portno = atoi(argv[1]); serv_addr.sin_family = AF_INET; serv_addr.sin_addr.s_addr = htonl(INADDR_ANY); serv_addr.sin_port = htons(portno); int serv = bind(serv_sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)); if (serv < 0) { cout << "Error occured on bind." << endl; exit(3); } if (listen(serv_sock, 5) < 0) { cout << "Server is ideal, not listening." << endl; exit(4); }

while (1) { clientaddr = sizeof(cli_addr);

client_sock = accept(serv_sock, (struct sockaddr *)&cli_addr, &clientaddr); if (client_sock < 0) { cout << "Client not connected!"; exit(4); }

cout << "New Connection with port " << inet_ntoa(cli_addr.sin_addr) << ntohs(cli_addr.sin_port) << endl; err = fork(); // create a process that manages the game as opponent. if (err == -1) { cout << "Parent: fork failed, errno = " << errno << endl; exit(5); } else if (err == 0) { sprintf(child, "%d", client_sock); err = execl("./serverG", "serverG", child, NULL); if (err == -1) { cout << " parent: ServerG not found: = " << errno << endl; exit(6); } } else close(client_sock); cout << "Waiting for connection." << endl; sleep(2); } close(client_sock); close(serv_sock); return 0; }

tictactoe_constants

#ifndef TICTACTOE_CONSTANTS_H #define TICTACTOE_CONSTANTS_H #define COMPUTER 1 #define PLAYER 2 #define SIDE 3 #define COMPUTERMOVE 'O' #define PLAYERMOVE 'X' #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std;

const char *SERVER_FILE = "server_socket"; char Board[3][3];

void showBoard(string); int *randomGenerator(); void mark(int, int, int); bool moveIsValid(int, int); int switchPlayer(int); int checkWin(); #endif