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#include <endian.h> struct msghdr { void *msg_name; socklen_t msg_namelen; struct iovec *msg_iov; int msg_iovlen, __pad1; void *msg_control; socklen_t msg_controllen; int __pad2; int msg_flags; }; struct cmsghdr { socklen_t cmsg_len; int __pad1; int cmsg_level; int cmsg_type; };