Function send_fd_message

dpdk/lib/vhost/socket.c:162–209

}

int
send_fd_message(char *ifname, int sockfd, char *buf, int buflen, int *fds, int fd_num)
{

	struct iovec iov;
	struct msghdr msgh;
	size_t fdsize = fd_num * sizeof(int);
	char control[CMSG_SPACE(fdsize)];
	struct cmsghdr *cmsg;
	int ret;

	memset(&msgh, 0, sizeof(msgh));
	iov.iov_base = buf;
	iov.iov_len = buflen;

	msgh.msg_iov = &iov;
	msgh.msg_iovlen = 1;

	if (fds && fd_num > 0) {
		msgh.msg_control = control;
		msgh.msg_controllen = sizeof(control);
		cmsg = CMSG_FIRSTHDR(&msgh);
		if (cmsg == NULL) {
			VHOST_LOG_CONFIG(ifname, ERR, "cmsg == NULL\n");
			errno = EINVAL;
			return -1;
		}
		cmsg->cmsg_len = CMSG_LEN(fdsize);
		cmsg->cmsg_level = SOL_SOCKET;
		cmsg->cmsg_type = SCM_RIGHTS;
		memcpy(CMSG_DATA(cmsg), fds, fdsize);
	} else {
		msgh.msg_control = NULL;
		msgh.msg_controllen = 0;
	}

	do {
		ret = sendmsg(sockfd, &msgh, MSG_NOSIGNAL);
	} while (ret < 0 && errno == EINTR);

	if (ret < 0) {
		VHOST_LOG_CONFIG(ifname, ERR, "sendmsg error on fd %d (%s)\n",
			sockfd, strerror(errno));
		return ret;
	}

	return ret;
}

static void
vhost_user_add_connection(int fd, struct vhost_user_socket *vsocket)