HP-UX defines the following:
struct ipc_perm {
# ifdef _CLASSIC_ID_TYPES
unsigned short filler_uid;
unsigned short uid; /* owner's user id */
unsigned short filler_gid;
unsigned short gid; /* owner's group id */
unsigned short filler_cuid;
unsigned short cuid; /* creator's user id */
unsigned short filler_cgid;
unsigned short cgid; /* creator's group id */
# else
uid_t uid; /* owner's user id */
gid_t gid; /* owner's group id */
uid_t cuid; /* creator's user id */
gid_t cgid; /* creator's group id */
# endif
but I don't know about other SysV ports.
I don't think that it is a good idea to tack new fields on past the end of
the old structures, though, because new function calls are going to be
needed anyway (there isn't enough space left in the old structures).
Leaving the old fields around in a new structure would just be dead
weight, since new programs won't ever use them.
-Chris Wing
wingc@engin.umich.edu
On Thu, 2 Dec 1999, Dominik Kubla wrote:
> Didn't SysV enlarge its structures in a compatible way? Eg having the start
> of the struct being compatible to the old 16bit stuff and then simply tack
> the 32bit stuff on at the end? I am sure i saw this somewhere....
>
> Dominik
>
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