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function SA_LEN(const Buf): Cardinal; // Untyped buffer; this is *unsafe*.
begin
Result:=__libc_sa_len(PSockAddr(@Buf)^.sa_family);
end;
function CMSG_DATA(cmsg: Pointer): PByte;
begin
Result:=PByte(Cardinal(cmsg) + SizeOf(Pcmsghdr));
end;
function CMSG_NXTHDR(mhdr: Pmsghdr; cmsg: Pcmsghdr): Pcmsghdr;
begin
Result:=__cmsg_nxthdr(mhdr, cmsg);
end;
function CMSG_FIRSTHDR(mhdr: Pmsghdr): Pcmsghdr;
begin
if mhdr^.msg_controllen >= SizeOf(cmsghdr) then
Result:=mhdr^.msg_control
else
Result:=nil;
end;
function CMSG_ALIGN(len: size_t): size_t;
begin
Result:=(len+SizeOf(size_t)-1) and (not(SizeOf(size_t)-1));
end;
function CMSG_SPACE(len: size_t): size_t;
begin
Result:=CMSG_ALIGN(len)+CMSG_ALIGN(SizeOf(cmsghdr));
end;
function CMSG_LEN(len: size_t): size_t;
begin
Result:=CMSG_ALIGN(SizeOf(cmsghdr))+len;
end;
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