Cmsg len space size t #4905
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Cmsg len space size t #4905
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The original intent was to simplify the reasoning for how they differ across platforms. It should as a consequence also make it easier to extend target support. Changes: - CMSG_* functions which can be const are all marked const. - Removes unsafe from `CMSG_ALIGN`, `CMSG_SPACE`, `CMSG_LEN`. Fixes: Custom CMSG_FIRSTHDR implementation for VxWorks had missed to check that `mhdr.msg_controllen >= size_of::<cmsghdr>()`, as per POSIX 1003.1-2024. Documents: - Usage and safety requirements. - Adds missing references to upstream headers.
Fixes: rust-lang#3240 Matches all platforms except Solaris and its descendants. `size_t` is used there regardless in order to force excessive conversions, and to make cross-platform code easier to write. [illumos]: https://github.com/illumos/illumos-gate/blob/118b2dbf1f4a745a7e35a5054a777c09bd90fff7/usr/src/uts/common/sys/socket.h#L499-L505
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This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed. Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers. |
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Builds upon #4908
Use
size_tfor parameter and return value of CMSG_{LEN,SPACE}Fixes: #3240
Matches all platforms except Solaris and its descendants.
size_tisused there regardless in order to force excessive conversions, and to
make cross-platform code easier to write.