H. Peter Anvin [hpa@xxxxxxxxx] wrote:
| On 09/09/2009 05:19 AM, Arnd Bergmann wrote:
| >
| > This is a complex problem. The structure above would need a conversion
| > for the pointer size that you can avoid by using a u64, but that introduces
| > another problem:
| >
| > 2. use a single pointer, with variable length data structures:
| >
| > struct pid_set {
| > int num_pids;
| > pid_t pids[0];
| > };
| >
| > Since pid_t is always an int, you have no problem with padding or
| > incompatible types, but rely on a data structure definition that
| > is not in C89 (not sure about C99).
C90 or C99 below should work. Is it ok to use a data structure that is
not in C89 ?
BTW, would it work if we defined
struct pid_set {
u64 pids;
int num_pids;
}
where ->pids can be still be a pointer ? The data structure would
have the same size on all architectures.
Thanks for the input
Sukadev
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