[roll] Roll fuchsia [roll] Roll llvm-project/libc [libc] Add struct cmsghdr and associated macros (#193756) The macros are the main source of subtlety. The interesting aspects are: - some implementations CMSG_ALIGN the size of struct cmsghdr, but this is a noop. Instead of doing that, I added an assertion in the test. - POSIX permits CMSG_NXTHDR to return null if the buffer has no space for the data array, and this behavior differs between implementations. This implementation does not do that in order to match CMSG_FIRSTHDR, which doesn't have such an option. - some implementations redirect the CMSG_NXTHDR macro to an (extern or static inline) function. I implemented this inside the macro to avoid having to define a (private ?) entry point for that function. --------- Co-authored-by: Jeff Bailey <jbailey@raspberryginger.com> GitOrigin-RevId: 89894b67484694aeaaec9c6bac6a09d71c347e6f Original-Revision: 047efa7d043187dc625e1abfaaadb6e461b0279a Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1590069 Original-Revision: 6983da25711bf4f75f61d26967bc613e1feae4db GitOrigin-RevId: 80510c8240f469106e6dec16bd9f2d26c9dc1720 Change-Id: I04c6ec0ede811e50e4319b59e65d0f7f899c0af3
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