Function NgRecvMsg

tools/libnetgraph/msg.c:296–329

* Receive a control message. * * On error, this returns -1 and sets errno. * Otherwise, it returns the length of the received reply. */

 * Otherwise, it returns the length of the received reply.
 */
int
NgRecvMsg(int cs, struct ng_mesg *rep, size_t replen, char *path)
{
	u_char sgbuf[NG_PATHSIZ + NGSA_OVERHEAD];
	struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
	socklen_t sglen = sizeof(sgbuf);
	int len, errnosv;

	/* Read reply */
	len = recvfrom(cs, rep, replen, 0, (struct sockaddr *) sg, &sglen);
	if (len < 0) {
		errnosv = errno;
		if (_gNgDebugLevel >= 1)
			NGLOG("recvfrom");
		goto errout;
	}
	if (path != NULL)
		strlcpy(path, sg->sg_data, NG_PATHSIZ);

	/* Debugging */
	if (_gNgDebugLevel >= 2) {
		NGLOGX("RECEIVED %s:",
		    (rep->header.flags & NGF_RESP) ? "RESPONSE" : "MESSAGE");
		_NgDebugSockaddr(sg);
		_NgDebugMsg(rep, sg->sg_data);
	}

	/* Done */
	return (len);

errout:
	errno = errnosv;
	return (-1);
}

/*
 * Identical to NgRecvMsg() except buffer is dynamically allocated.