On Tuesday 16 May 2006 16:18, Alain Michaud wrote: > Do I need open a "file deccriptor" in order to communicate using > IOCTL?
Yes, you have to open the device before talking to it. Or what the hell do you think, the "Handle" parameter of |Function FpIOCtl (Handle:cint;Ndx: culong;Data: Pointer):cint; is for? As always: RTFM, reading the man page (man 2 ioctl) actually might help too: |DESCRIPTION | [...] The argument d must be an open file descriptor. | |RETURN VALUE | Usually, on success zero is returned. A few ioctls use | the return value as an output parameter and return a non | negative value on success. On error, -1 is returned, and | errno is set appropriately. BTW, I agree - writing device drivers sucks. I know. :-) But checking out http://www.freesoftwaremagazine.com/articles/drivers_linux may be worth a try. Regards, Vinzent. _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
