int main int argc char argv int master slave char name char buf char m

int main(int argc, char** argv) {
    
    int master, slave;
    char *name;

    
    char *buf = (char*)malloc(4096);
    
    master = open("/dev/ptmx",O_RDWR|O_NOCTTY|O_NONBLOCK);
    if (master < 0) return 0;

    if (grantpt (master) < 0 || unlockpt (master) < 0) throw 1;
    name = ptsname (master);
    if (name == NULL) throw 1;
    
    fd_set readset;
    timeval tv;
    tv.tv_sec = 30;
    tv.tv_usec = 0;
    while (true){
        FD_ZERO(&readset);
        FD_SET(0, &readset);
        FD_SET(master, &readset);
        if(select(master+1, &readset, NULL, NULL, &tv) <= 0) {
            continue;
        }
        
        //stdin
        if(FD_ISSET(0, &readset)) {
            int bytesRead = read(0,buf,4096);
            write(master,buf,bytesRead);
        }
        
        //pty
        if(FD_ISSET(master, &readset)) {
            int bytesRead;
            while (bytesRead = read(master,buf,4096) > 0){
                write(1,buf,bytesRead);
            }
            int i = errno;
        }
        
    }
   
    return (EXIT_SUCCESS);
}