1#include <endian.h> 2 3struct msghdr { 4 void *msg_name; 5 socklen_t msg_namelen; 6 struct iovec *msg_iov; 7#if __BYTE_ORDER == __BIG_ENDIAN 8 int __pad1, msg_iovlen; 9#else 10 int msg_iovlen, __pad1; 11#endif 12 void *msg_control; 13#if __BYTE_ORDER == __BIG_ENDIAN 14 int __pad2; 15 socklen_t msg_controllen; 16#else 17 socklen_t msg_controllen; 18 int __pad2; 19#endif 20 int msg_flags; 21}; 22 23struct cmsghdr { 24#if __BYTE_ORDER == __BIG_ENDIAN 25 int __pad1; 26 socklen_t cmsg_len; 27#else 28 socklen_t cmsg_len; 29 int __pad1; 30#endif 31 int cmsg_level; 32 int cmsg_type; 33}; 34