How work ioctl?

First of all Happy new year (2 week later)

I haven't work on OBOS (when we will have the real name=3F) this holidays 
because I have  gone snowboarding for 1 week.
And I'm back with one more year.
Matthijs you do a great job on Midi2. Congratulation.

I have found how make the softsynth (in theorie no code for now), and I 
know how create reverb on sound. 
I'm writing the milestone 3, but I have never use ioctl function. 

that what I write:

		FILE *fichier =3D fopen("/dev/midi/ymf754/1", "rw");
		int file =3D fileno(fichier); //result is 3 seems to be OK

uchar *data =3D [0x90 0x39 0x64];
	midi=5Ftimed=5Fdata DataToSend;
		DataToSend.when =3D time;
		DataToSend.size =3D length;
		DataToSend.data =3D data;
		int i =3D ioctl(fd, B=5FMIDI=5FTIMED=5FWRITE, &DataToSend, 
sizeof(midi=5Ftimed=5Fdata));

Like this in midi=5Fdriver.h

But I have always i =3D=3D -1 that means an error appear

If you have an idea


A+
Jerome