Function send_msg

dpdk/lib/eal/common/eal_common_proc.c:685–741

* Return -1, as fail to send message and it's caused by the local side. * Return 0, as fail to send message and it's caused by the remote side. * Return 1, as succeed to send message. */

 * Return 1, as succeed to send message.
 */
static int
send_msg(const char *dst_path, struct rte_mp_msg *msg, int type)
{
	int snd;
	struct iovec iov;
	struct msghdr msgh;
	struct cmsghdr *cmsg;
	struct sockaddr_un dst;
	struct mp_msg_internal m;
	int fd_size = msg->num_fds * sizeof(int);
	char control[CMSG_SPACE(fd_size)];

	m.type = type;
	memcpy(&m.msg, msg, sizeof(*msg));

	memset(&dst, 0, sizeof(dst));
	dst.sun_family = AF_UNIX;
	strlcpy(dst.sun_path, dst_path, sizeof(dst.sun_path));

	memset(&msgh, 0, sizeof(msgh));
	memset(control, 0, sizeof(control));

	iov.iov_base = &m;
	iov.iov_len = sizeof(m) - sizeof(msg->fds);

	msgh.msg_name = &dst;
	msgh.msg_namelen = sizeof(dst);
	msgh.msg_iov = &iov;
	msgh.msg_iovlen = 1;
	msgh.msg_control = control;
	msgh.msg_controllen = sizeof(control);

	cmsg = CMSG_FIRSTHDR(&msgh);
	cmsg->cmsg_len = CMSG_LEN(fd_size);
	cmsg->cmsg_level = SOL_SOCKET;
	cmsg->cmsg_type = SCM_RIGHTS;
	memcpy(CMSG_DATA(cmsg), msg->fds, fd_size);

	do {
		snd = sendmsg(mp_fd, &msgh, 0);
	} while (snd < 0 && errno == EINTR);

	if (snd < 0) {
		rte_errno = errno;
		/* Check if it caused by peer process exits */
		if (errno == ECONNREFUSED &&
				rte_eal_process_type() == RTE_PROC_PRIMARY) {
			unlink(dst_path);
			return 0;
		}
		RTE_LOG(ERR, EAL, "failed to send to (%s) due to %s\n",
			dst_path, strerror(errno));
		return -1;
	}

	return 1;
}