int MVideo::Ioctl ( int  req, void *  opt, bool  allowirq = true, bool  force = false  ) const

private

Definition at line 108 of file MVideo.cc.

References fFileDesc, fPath, and gLog.

Referenced by CaptureStart(), CaptureWait(), Enumerate(), EnumerateControls(), GetCapabilities(), GetProperties(), GetTunerAbilities(), GetVideoStandard(), Init(), ReadControl(), SetChannel(), Start(), and WriteControl().

{
    if (fFileDesc<0)
    {
        gLog << err << "ERROR - Ioctl: Device " << fPath << " not open." << endl;
        return -1;
    }

    while (1)
    {
        // FIXME: This call is a possible source for a hangup
        const int rc = ioctl(fFileDesc, req, opt);
        if (rc==0)
            return 0;

        if (errno==EINVAL)
            return 1;

        if (!allowirq && errno==EAGAIN)
            return -4;

        cout <<"errno="<< errno << endl;

        // errno== 4: Interrupted system call (e.g. by alarm())
        // errno==16: Device or resource busy
        if (errno==4 || errno==16)
        {
            if (!allowirq && errno==4)
                return -4;

            gLog << err << "ERROR - MVideo::Ioctl 0x" << hex << req << ": errno=" << dec << errno << " - ";
            gLog << strerror(errno) << " (rc=" << rc << ")" << endl;
            usleep(10);
            continue;
        }

        if (!force)
        {
            gLog << err << "ERROR - MVideo::Ioctl 0x" << hex << req << ": errno=" << dec << errno << " - ";
            gLog << strerror(errno) << " (rc=" << rc << ")" << endl;
        }
        return rc;
    }
    return -1;
}

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