Hi Florin,
I ran the app with root permission only, still getting same error message.
if (vl_socket_client_recv_fd_msg2 (&wrk->bapi_sock_ctx, fds, mp->n_fds,
5))
goto failed;
clib_warning("Praveen wrk->bapi_sock_ctx.socket_fd %d fds %d
mp->n_fds %d ", wrk->bapi_sock_ctx.socket_fd, fds,mp->n_fds);
Below is the output:
vl_api_app_attach_reply_t_handler:87: Praveen wrk->bapi_sock_ctx.socket_fd
6 fds 1694124968 mp->n_fds 3
Thanks,
Praveen
On Thu, Nov 20, 2025 at 11:05 AM Florin Coras via lists.fd.io <fcoras.lists=
[email protected]> wrote:
> Hi Praveen,
>
> Inline.
>
> On Nov 19, 2025, at 9:19 PM, Praveen Singh via lists.fd.io <praveen.553=
> [email protected]> wrote:
>
> Hi Florin,
> Thank you for your reply. Here is the additional log which I printed.
> VCL<2105>: configured namespace_id vcl
> VCL<2105>: configured namespace_secret 123456 (0x1e240)
> VCL<2105>: completed parsing vppcom config!
> vppcom_app_create:1503: vcl<0:-1>: Allocate default worker
> vcl_worker_alloc_and_init:287: vcl<2105:0>: Praveen: worker index 0,
> worker mqs_epfd 5, wrk->app_api_sock.fd
> clib_socket_init:639: Praveen: socket (fd 6, '/var/run/pw/vpp-api.sock')
> vcl_bapi_connect_to_vpp:558: vcl<2105:0>: app (test-wrk-0) is connected to
> VPP!
> vcl_bapi_init:663: vcl<2105:0>: sending session enable
>
> *vcl_mq_epoll_add_api_sock:54: vcl<2105:0>: created cs->fd=0
> wrk->mqs_epfd 5 errno=1 (Operation not permitted) rv -1*
>
>
> This is used to track vpp’s status. So not critical unless you want vcl to
> reattach after vpp restarts.
>
>
> *vcl_mq_epoll_add_evfd:93: vcl<2105:0>: created mqs_epfd=10
> wrk->mqs_epfd 5 errno=1 (Operation not permitted)*
>
>
> This is used by vpp to signal the presence of new events in the message
> queue to vcl. If “mqs_epfd” is actually “mq_fd” in that function, the value
> looks reasonable. Maybe this is really a permission problem. Have you tried
> running the app as root?
>
> Regards,
> Florin
>
> *vppcom_app_create:1513: vcl<2105:0>: app_name 'test', my_client_index
> 1280 (0x500)*
> DEBUG: vcl_app_create_wrapper: VCL app creation - app_name=test, ret=0
> vppcom_session_create:1572: vcl<2105:0>: created session 0
> DEBUG: vcl_socket_wrapper: VCL socket created - domain=2, type=2,
> proto=17, options=2, sockfd=0, errno=0 (Success)
> DEBUG: vcl_bind_wrapper: === BIND OPERATION START ===
> DEBUG: vcl_bind_wrapper: sockfd=0, addrlen=16
> vppcom_session_bind:1767: vcl<2105:0>: session 0 handle 0: binding to
> local IPv4 address 10.166.220.80 port 862, proto UDP
> vppcom_session_listen:1796: vcl<2105:0>: session 0: sending vpp listen
> request...
> vcl_send_session_listen:75: vcl_send_session_listen: vnode id:0 thread
> id:0 clt:1280 wrk:0 port:24067 proto:1
> vcl_session_app_add_segment_handler:992: vcl<2105:0>: mapped new segment
> 'seg-5-6-52' size 134230016
> vcl_session_bound_handler:602: vcl<2105:0>: session 0 [0xf]: listen
> succeeded!
> DEBUG: vcl_bind_wrapper: VCL bind result - sockfd=0, ret=0, errno=0
> (Success)
> DEBUG: vcl_bind_wrapper: VCL bind successful - sockfd=0
>
> One more question, What is the impact of the below error?
> vcl_mq_epoll_add_evfd:90: vcl<118:0>: failed to add mq socket to mq epoll
> fd
>
> Thanks,
> Praveen
>
> On Thu, Nov 20, 2025 at 1:19 AM Florin Coras via lists.fd.io
> <[email protected]> wrote:
>
>> Hi Praveen,
>>
>> You’d probably have to check the exact reason why epoll_ctl fails. But
>> some quick comments:
>> - we’re moving away from binary api in vcl. We’re still building it but
>> it’s slowly being deprecated. I’d recommend switching to sapi api.
>> - maybe check vl_api_app_attach_reply_t_handler and confirm that
>> wrk->app_event_queue fd we got from vl_socket_client_recv_fd_msg2 is
>> reasonable.
>>
>> Regards,
>> Florin
>>
>> > On Nov 18, 2025, at 7:59 PM, Praveen Singh via lists.fd.io
>> <[email protected]> wrote:
>> >
>> > Hi All,
>> > When i connected my vcl app, i got below error. any input on below
>> error?
>> > <inline.0.part>
>> >
>> >
>> >
>>
>>
>>
>>
>>
>
>
>
>
>
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