On Wed, 7 Jan 2026 11:44:24 GMT, Martin Doerr <[email protected]> wrote:
>> \What happens if you create a user on AIX with a uid bigger than 2^31 and >> call `getpwuid_r` on it (by hardcoding `tmpUid` as a negative number)? > > I haven't tried (not my machine), but it's undefined behavior. There's no > guarantee that `getpwuid_r` does what we expect. We should never use > undefined behavior. Also note that not only AIX is affected. > It's unfortunate that the FFM doesn't provide a good abstraction for passing > `uint32_t`. Maybe we should implement an enhancement? Indeed, the status quo with respect to unsigned values passed to downcalls is a bit suboptimal, esp. in certain ABIs where sign/zero extension is required. This is tracked here: https://bugs.openjdk.org/browse/JDK-8336664 (apologies -- this link was already shared by @dmlloyd ) ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/28931#discussion_r2668596071
