How to find which command generates error in FE_SET_PROPERTY

[Michel Verbraak <michel@xxxxxxxxxxxx>]

I'm trying to modify one of my applications to use the new S2API. With 
this application I control my dvb-t and dvb-s/s2 receivers.

I'm using szap-s2 as an example but I run into a problem that the ioctl 
FE_SET_PROPERTY always returns -1 and variable errno is set to 14.

My question is. How do I determine which of the commands in the command 
queue given to FE_SET_PROPERTY is producing this error. I did not try 
yet to devide my command queue up into one command queue per command.

Regards,

Michel.

Part of source code for dvb-s/s2:

#ifdef S2API
int TDVBDevice::SetProperty(struct dtv_property *cmdseq)
{
  int err;

  err = ioctl(vfrontendfd, FE_SET_PROPERTY, cmdseq);

  if (err < 0)
  {
    syslog(LOG_ERR, "ioctl FE_SET_PROPERTY failed (errno=%d, 
%d).",errno, err);
    return -1;
  }

  syslog(LOG_INFO, "ioctl FE_SET_PROPERTY ok.");
  return 0;
}
#else
int TDVBDevice::SetFrontend(struct dvb_frontend_parameters *frontend)
{
  if (ioctl(vfrontendfd, FE_SET_FRONTEND, frontend) < 0)
  {
    syslog(LOG_ERR, "ioctl FE_SET_FRONTEND failed (errno=%d).",errno);
    return -1;
  }

  return 0;
}
#endif

//calling part
#ifdef S2API
    struct dtv_property p[DTV_IOCTL_MAX_MSGS];

    p[0].cmd = DTV_CLEAR;
    p[1].cmd = DTV_DELIVERY_SYSTEM; p[1].u.data = atoi(channel->Item(2));
    p[2].cmd = DTV_FREQUENCY;       p[2].u.data = (__u32)(ifreq * 1000);
    p[3].cmd = DTV_MODULATION;      p[3].u.data = QPSK;
    p[4].cmd = DTV_SYMBOL_RATE;     p[4].u.data = (__u32)(sr * 1000);
    p[5].cmd = DTV_INNER_FEC;       p[5].u.data = FEC_AUTO;
    p[6].cmd = DTV_INVERSION;       p[6].u.data = INVERSION_AUTO;
       //     { .cmd = DTV_ROLLOFF,           .u.data = rolloff },
    p[7].cmd = DTV_PILOT;           p[7].u.data = PILOT_AUTO;
    p[8].cmd = DTV_TUNE;

    struct dtv_properties cmdseq;

    cmdseq.num = 9;
    cmdseq.props = p;

#else 
    frontend.frequency = (unsigned int)(ifreq * 1000);
    frontend.inversion = INVERSION_AUTO;
    frontend.u.qpsk.symbol_rate = (unsigned int)(sr * 1000);
    frontend.u.qpsk.fec_inner = FEC_AUTO;
#endif

#ifdef S2API
      if (SetProperty(&p[0]) == 0)
#else
      if (SetFrontend(&frontend) == 0)
#endif



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