/*
* Check version numbers on the relayd.
+ * If major versions are compatible, we assign minor_to_use to the
+ * minor version of the procotol we are going to use for this session.
*
* Return 0 if compatible else negative value.
*/
int relayd_version_check(struct lttcomm_sock *sock, uint32_t major,
- uint32_t minor)
+ uint32_t minor, uint32_t *minor_to_use)
{
int ret;
struct lttcomm_relayd_version msg;
* communication is not possible. Only major version equal can talk to each
* other. If the minor version differs, the lowest version is used by both
* sides.
- *
- * For now, before 2.1.0 stable release, we don't have to check the minor
- * because this new mechanism with the relayd will only be available with
- * 2.1 and NOT 2.0.x.
*/
- if (msg.major == major) {
- /* Compatible */
- ret = 0;
- DBG2("Relayd version is compatible");
+ if (msg.major != major) {
+ /* Not compatible */
+ ret = -1;
+ DBG2("Relayd version is NOT compatible. Relayd version %u != %u (us)",
+ msg.major, major);
goto error;
}
* version is higher, it will adapt to our version so we can continue to
* use the latest relayd communication data structure.
*/
+ if (minor <= msg.minor) {
+ *minor_to_use = minor;
+ } else {
+ *minor_to_use = msg.minor;
+ }
- /* Version number not compatible */
- DBG2("Relayd version is NOT compatible. Relayd version %u != %u (us)",
- msg.major, major);
- ret = -1;
+ /* Version number compatible */
+ DBG2("Relayd version is compatible, using protocol version %u.%u",
+ major, *minor_to_use);
+ ret = 0;
error:
return ret;
/*
* Close relayd socket with an allocated lttcomm_sock.
+ *
+ * If no socket operations are found, simply return 0 meaning that everything
+ * is fine. Without operations, the socket can not possibly be opened or used.
+ * This is possible if the socket was allocated but not created. However, the
+ * caller could simply use it to store a valid file descriptor for instance
+ * passed over a Unix socket and call this to cleanup but still without a valid
+ * ops pointer.
+ *
+ * Return the close returned value. On error, a negative value is usually
+ * returned back from close(2).
*/
int relayd_close(struct lttcomm_sock *sock)
{
+ int ret;
+
/* Code flow error. Safety net. */
assert(sock);
+ /* An invalid fd is fine, return success. */
+ if (sock->fd < 0) {
+ ret = 0;
+ goto end;
+ }
+
DBG3("Relayd closing socket %d", sock->fd);
- return sock->ops->close(sock);
+ if (sock->ops) {
+ ret = sock->ops->close(sock);
+ } else {
+ /* Default call if no specific ops found. */
+ ret = close(sock->fd);
+ if (ret < 0) {
+ PERROR("relayd_close default close");
+ }
+ }
+
+end:
+ return ret;
}
/*