https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_socket.h.html
const posix_msghdr = extern struct
const posix_msghdr = extern struct {
name: ?*sockaddr,
namelen: socklen_t,
iov: [*]iovec,
pad0: MuslOnlyPadding(.big) = 0,
iovlen: u32,
pad1: MuslOnlyPadding(.little) = 0,
control: ?*anyopaque,
pad2: MuslOnlyPadding(.big) = 0,
controllen: socklen_t,
pad3: MuslOnlyPadding(.little) = 0,
flags: u32,
}