Function recvmmsg
pub unsafe extern "C" fn recvmmsg(sockfd: c_int, msgvec: *mut mmsghdr, vlen: c_uint, flags: c_int, timeout: *mut timespec) -> c_intrecvmmsgpub unsafe extern "C" fn recvmmsg(sockfd: c_int, msgvec: *mut mmsghdr, vlen: c_uint, flags: c_int, timeout: *mut timespec) -> c_int