Multi pipe in c cat | ls

Question

I'm doing a little bash and for my pipe, I have everything work but the command cat | ls or cat | cat | ls that don't react as bash does. Here is my code.

The WNOHANG execute two fork.

Thank you!

void    ft_pipe(t_list **token, t_list **cmp)
{
    int     fd[2];
    int     pid;
    int     fd_read;
    char    *exec_tube1;
    int     i;

    fd_read = 0;
    i = 1;
    while ((*token) != NULL)
    {
        if (ft_get_path2(cmp, *token, &exec_tube1))
            exit_failure("invalid cmd");
        if (pipe(fd) == -1)
            exit_failure("pipe() error");
        pid = fork();
        if (pid == -1)
            exit_failure("fork() error");
        else if (pid == 0)
        {
            dup2(fd_read, 0);
            if ((*token)->next != NULL)
                dup2(fd[1], 1);
            ft_bultin(token);
            g_err = execve(exec_tube1, (*token)->arg,
                    ((t_myenv *)(*cmp)->env->content)->envp);
            if (g_err == -1)
                exit_failure((*token)->arg[0]);
            ft_exit(g_err);
        }
        i++;
        ft_close(fd[1], fd_read);
        if (i % 2 == 0 && (*token)->next)
            waitpid(0, NULL, WNOHANG);
        else
            ft_check_signal(pid);
        fd_read = fd[0];
        *token = (*token)->next;
    }
    ft_close(fd[1], fd_read);
}