Al Viro wrote:
> At least 3 versions, unless you want to mess with ifdefs to reduce them to
> two.

I don't think you need to do fancy #ifdef's:

static s32 return_eio_32(void) { return -EIO; }
static s64 return_eio_64(void) { return -EIO; }
extern void return_eio_unknown(void);   /* Doesn't exist */
#define return_eio(type)        ((sizeof(type) == 4)                    \
                                        ? ((void *) return_eio_32)      \
                                : ((sizeof(type) == 8)                  \
                                        ? ((void *) return_eio_64)      \
                                        : ((void *) return_eio_unknown)))

-Mitch
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