On 2022/5/10 17:30, Tony Lu wrote: > On Mon, May 09, 2022 at 07:58:37PM +0800, Guangguan Wang wrote: >> Connect with O_NONBLOCK will not be completed immediately >> and returns -EINPROGRESS. It is possible to use selector/poll >> for completion by selecting the socket for writing. After select >> indicates writability, a second connect function call will return >> 0 to indicate connected successfully as TCP does, but smc returns > > If the connection is established successfully, the following up call of > connect() returns -EISCONN (SS_CONNECTED), which is expected and SMC > does it, same as TCP. > > In case of misunderstanding, could you append more detailed information? > > Thanks, > Tony Lu > io_uring uses nonblocking connect as follow steps: 1) call connect with nonblocking 2) wait for selector/poll to indicate writability 3) call connect to confirm connection's state In the third step, tcp changes the socket state from SS_CONNECTING to SS_CONNECTED and returns 0 if the connection is established successfully, but smc returns -EISCONN.
