[libc-commits] [libc] [libc] Add struct cmsghdr and associated macros (PR #193756)

[Jeff Bailey via libc-commits]

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@@ -50,4 +50,23 @@
 #define SHUT_WR 1
 #define SHUT_RDWR 2
 
+#define SCM_RIGHTS 1
+
+#define CMSG_ALIGN(len) (((len) + sizeof(size_t) - 1) & ~(sizeof(size_t) - 1))
+#define CMSG_LEN(len) (sizeof(struct cmsghdr) + (len))
+#define CMSG_SPACE(len) (sizeof(struct cmsghdr) + CMSG_ALIGN(len))
+
+#define CMSG_FIRSTHDR(msg)                                                     \
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kaladron wrote:

It might not be worth it, your call.  I just get itchy thinking about the times I get confusing things out of macros where a compiler error could have told me how I was holding it wrong. =)

https://github.com/llvm/llvm-project/pull/193756