On 2012.08.22 11:21, Hans de Goede wrote:
> I would prefer to stick with the __u32, as that is what is in the kernels
> *userspace* headers
It's 2012, C99 + stdint.h have been around for more than decade [1],
and, unlike what may be the case for kernel developers who may worry
about C89 compatibility, we very much rely on that header being
available always in libusbx (#include <stdint.h> is part of libusb.h).
Thus, unless uint32_t and __u32 present incompatibilities on some Linux
platforms, in my view, using __u32 when uint32_t would do is really akin
to doing something like:
#define integer int
and then proceed to use 'integer' in lieu of 'int' in your source.
We already brought stdint.h types to very C99-reluctant platforms, such
as (older) MSVC's, so unless there's a technical reason not to use
uint32_t on Linux, I would *strongly* advise that we stick to C99 stdint
types. Makes it easier for everyone to follow our code, with one of the
rationale being that, if we go with __u32 above, someone may wonder why
we didn't go with uint32_t there, and waste time on a pointless search.
Besides, if after 10 years availability and countless evidence of
reinvention of the wheel for ## bit types, even if noone else is going
to promote stdint.h types, I sure as hell will.
> which we need anyways for the _IOWR / _IOR / _IOW macros.
except there isn't a C standard that sets a common definition for _IOWR
and friends, so it's a different issue.
> Ideally we would not have linux_usbfs.h at all, and instead
> use "#include <linux/usbdevice_fs.h>", but that will break things if
> that header is too old, so we're stuck with a private copy of that file...
This, I see no problem with. When there's no choice, you do what you
have to do. But for uint32_t vs __u32 we do have a choice, and one of
them is part of an actual C standard...
Regards,
/Pete
[1] http://en.wikipedia.org/wiki/C_standard_library#Header_files
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