Function sendmmsg
pub unsafe extern "C" fn sendmmsg(sockfd: c_int, msgvec: *mut mmsghdr, vlen: c_uint, flags: c_int) -> c_intsendmmsgpub unsafe extern "C" fn sendmmsg(sockfd: c_int, msgvec: *mut mmsghdr, vlen: c_uint, flags: c_int) -> c_int