/*
    Gets previews of PDF Documents
*/
void getPDFPreview(char *filepath, int maxy, int maxx)
{
    char imgout[] = "/tmp/prev.jpg";
    pid_t pid;
    pid = fork();

    struct sigaction act;
    sigemptyset(&act.sa_mask);
    act.sa_flags = 0;
    act.sa_handler = cb_sig;

    if(pid == 0)
    {
        execlp("pdftoppm","pdftoppm","-l","1","-jpeg",filepath,"-singlefile", "/tmp/prev", (char *)NULL);
        exit(1);
    }
    else
    {
        //int status;
        //waitpid(pid, &status, 0);
        if (ERR ==  wgetch(current_win))
        {
            printf("wgetch interrupted by signal\n");
        }
        else
        {
                raise(SIGUSR1);
        }

        if (raised_signal == SIGUSR1)
        {
                kill(pid, SIGINT);
        }
        else if (raised_signal == SIGCHLD)
        {
                getImgPreview(imgout, maxy, maxx);
                clearFlagImg = 1;
        }
    }
}