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SubjectRe: [PATCH] use size_t for the broken ioctl numbers
Linus Torvalds <> writes:

> On Sun, 7 Sep 2003, Andreas Schwab wrote:
>> Here is a patch that enforces the use of types in the third argument. It
>> requires gcc >= 3.1 for the check to work, I couldn't find a method for
>> previous versions.
> Ehh, what's wrong with the obvious approach: declare a dummy variable. If
> it's not a type, then the declaration won't work.
> Ie, change the (sizeof(x)) to something like
> ({ x __dummy; sizeof(__dummy); })
> which should work with all compiler versions.

This won't work with array types, eg. in <linux/random.h>:

#define RNDGETPOOL _IOR( 'R', 0x02, int [2] )


Andreas Schwab, SuSE Labs,
SuSE Linux AG, Deutschherrnstr. 15-19, D-90429 Nürnberg
Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
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