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#include <unistd.h> // for close
#include <string>
#include <cstring>
#include <netinet/in.h> // sockaddr_in
#include <sys/types.h> // for bind, connect
#include <sys/socket.h> // for bind, connect
#include <netinet/in.h> // for iten_aton, iten_ntoa
#include <arpa/inet.h> // for iten_aton, iten_ntoa
#include <fcntl.h> // for fcntl
#define SERVER_IP "127.0.0.1"
static int port = 7777;
int main(int argc, char *argv[])
{
int client = socket(AF_INET, SOCK_STREAM, 0);
if(client == -1) {
perror("socket");
return 1;
}
// remove "port sticking" aka socket in TIME_WAIT
int opt = 1;
setsockopt(client, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
/* call bind optional, the system chooses
the address automatically */
struct sockaddr_in server_adress;
server_adress.sin_family = AF_INET;
server_adress.sin_port = htons(port);
if(!inet_aton(SERVER_IP, &(server_adress.sin_addr))) {
perror("inet_aton");
return 1;
}
int res = connect(client, (struct sockaddr*) &server_adress,
sizeof(server_adress));
if(res == -1) {
perror("connect");
return 1;
}
printf("=> Connection to server %s with port number: %d\n",
inet_ntoa(server_adress.sin_addr), port);
// work with server
char buffer[1024];
memset(buffer, 0, sizeof(buffer)); // clear
int fd_stdin = STDIN_FILENO;
const int flags = fcntl(fd_stdin, F_GETFL, 0);
fcntl(fd_stdin, F_SETFL, flags | O_NONBLOCK);
bool exit = false;
do {
struct timeval *timeout;
timeout->tv_sec = 0;
timeout->tv_usec = 5000000;
fd_set rds, wrs;
FD_ZERO(&rds);
FD_ZERO(&wrs);
FD_SET(client, &rds);
int val = read(fd_stdin, buffer, sizeof(buffer));
if(val > 0) FD_SET(fd_stdin, &wrs);
res = select(client+1, &rds, &wrs, 0, timeout);
if(res < 0) {
if(errno == EINTR)
continue;
else {
perror("select");
break;
}
}
if(res > 0) {
if(FD_ISSET(fd_stdin, &wrs)) // if client want to send any message
{
if(buffer[0] == '#') // exit
exit = true;
else write(client, buffer, strlen(buffer)*sizeof(char));
memset(buffer, 0, sizeof(buffer)); // clear
}
if(FD_ISSET(client, &rds)) // if server want to send any message
{
read(client, buffer, sizeof(buffer));
printf("%s", buffer);
getchar(); /* FIXME: if you remove this thing,
then output will not be produced only
if you add '\n' to the end of the line */
memset(buffer, 0, sizeof(buffer)); // clear
}
}
} while (!exit);
printf("=> GoodBye...\n");
close(client);
return 0;
}
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