void DispMainMenu(char Selected)
{
        printf("n");
        printf("MAIN MENUn");
        printf("------------------------n");
        printf("1.MENU 1n");
        printf("2.MENU 2n");
        printf("3.MENU 3n");
        switch (Selected) {
                case 1 :
                        printf("> MENU 1n");
                        execl("play_audio", "./play_audio", "-c", "pcm16_2", "-lsbfirst", "1.wav", NULL);
                        break;
                case 2 :
                        printf("> MENU 2n");
                        execl("play_audio", "./play_audio", "-c", "pcm16_2", "-lsbfirst", "2.wav", NULL);
                        break;
                case 3 :
                        printf("> MENU 3n");
                        execl("play_audio", "./play_audio", "-c", "pcm16_2", "-lsbfirst", "3.wav", NULL);
                        break;
        }//switch
}//DispMainMenu()

void main(void)
{
        char c, SelectedMenu;

  SelectedMenu = 1;
        do {
                DispMainMenu(SelectedMenu);

                c = getc();
                switch (c) {
                        case 'U' :
                                SelectedMenu--;
                                if (SelectedMenu < 1) SelectedMenu = 3;
                                break;
                        case 'D' :
                                SelectedMenu++;
                                if (SelectedMenu > 3) SelectedMenu = 1;
                                break;
                        case 'X' :
                                //PlaySub(SelectedMenu);
                                break;
                        case 'M' :
                                c = 0;
                                break;
                        default:
                                break;
                }//switch
                if (c == 0)        break;
        } while(1);
}//main()


커널은 2.4.xx 입니다.

이정도 정보로 답을 알수 있을지 모르겠네요.


      질문의 요지는 아래의 execl함수 실행 후
      메인프로그램내에 있어야 하는 데 메인 프로그램까지 끝나는 점입니다.

execl("play_audio", "./play_audio", "-c", "pcm16_2", "-lsbfirst", "1.wav", NULL);

     - play_audio  : audio를 재생하는 외부 프로그램
      - 1.wav  : audio data file