open_mode

[Pattara Kiatisevi]

Hi,

I'm working further on my sound driver in the sound_open() function.
>From application code I do:

audio_fd = open("/dev/dsp", 4, 1)

And then in the driver code:

rtems_device_driver sound_open(
  rtems_device_major_number major,
  rtems_device_minor_number minor,
  void                    * arg
)
{
  rtems_libio_open_close_args_t *args = arg;

  /* Only write-only mode is supported now */
  printf("args->flags is 0x%4X\n", args->flags);
  printf("args->mode is 0x%4X\n", args->mode);
  if ( args->flags == 0x0004 ) {
    printf("/dev/dsp opened...\n");
    return RTEMS_SUCCESSFUL;
  } else {
    return RTEMS_NOT_IMPLEMENTED;
  }

Hmm, but amazing (to me) is that the debugged output said:

args->flags is 0x 103
args->mode is 0x   1
/dev/dsp: Permission denied

Hmm, the flag I sent was "4" or "0x0004" but how could it become 0x103?
Anybody has idea?

Thank you,
Pattara}

The best things in life are free. - B.G. DeSilva (1927)
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Ott Pattara Kiatisevi 				   T L W G
M.Sc. INFOTECH Student, Stuttgart, Germany	http://linux.thai.net/
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