Hi Jonathan That is what I would have ended up with anyway. But I did not find gcc option to force long to 32 bit. I got my answer, the best way is to use "u32" datasize, which would work across 32/64 bit platform. Prashant -----Original Message----- From: fedora-list-bounces@xxxxxxxxxx [mailto:fedora-list-bounces@xxxxxxxxxx] On Behalf Of Jonathan Berry Sent: Monday, April 04, 2005 5:27 PM To: For users of Fedora Core releases Subject: Re: 64bit driver driver with 32 bit long On Apr 4, 2005 1:04 PM, Tawade, Prashant <prashant.tawade@xxxxxxxxx> wrote: > > Hi > > Does anyone know how to build a 64 bit driver with "32 bit unsigned long", > as is in the case of windows 64 bit drivers ? > > Prashant Hi Prashant, What exactly do you mean? With a 64-bit compile, an unsigned long variable is going to be 64-bits wide. As far as I know, there is no way to change that. sizeof(long) == sizeof(void *) has to be true. To use a 32-bit wide (unsigned) variable, use the unsigned int type. For example: typedef unsigned int u32type; "u32type" can be whatever you want to call your unsigned 32-bit data type. If this code has to work for both 32- and 64-bit environments, then you should use some #if statements to determine which typedef to use. Is this what you wanted to know, or are you asking something different? Jonathan -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: http://www.redhat.com/mailman/listinfo/fedora-list
