Hi there,
Is there any reason you don’t want to use the higher level C API? VAPI.
That has an API call for dumping interfaces.
Then you don’t need to interact with the shared memory rings directly.
Cheers
Ole
> On 12 Sep 2018, at 14:28, "wangchuan...@163.com" <wangchuan...@163.com> wrote:
>
> Hi Dave,
> Thanks for your help!
> In the test.c , I see "if (async) { *send-ping* ".
> And vac_connect's 3rd input-param set to NULL, I want the operation-by-c-api
> to be synch.
>
> Even no change, it (src/vpp-api/client) can not work successfully.
> Is there something wrong?
>
> Maybe, should I follow another example?
> Can you give me a example that can dump sw_interfaces?
> Be deeply grateful.
>
> wangchuan...@163.com
>
> From: Dave Barach (dbarach)
> Date: 2018-09-11 21:10
> To: wangchuan...@163.com; vpp-dev@lists.fd.io
> Subject: RE: [vpp-dev] VPP's C-type-api example
> The typical coding pattern to use when you don’t know how many messages will
> come back: send a dump request, followed by an echo-ping.
>
> When the ping reply shows up, the dump is complete...
>
> HTH... Dave
>
> From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of
> wangchuan...@163.com
> Sent: Tuesday, September 11, 2018 4:34 AM
> To: vpp-dev <vpp-dev@lists.fd.io>
> Subject: [vpp-dev] VPP's C-type-api example
>
> Hi all,
> I code my example following src/vpp-api/client, but do {vac_read}while(1)
> often block when the results-num does not know.
> It shows pthread_cond_wait when gdb.
> Help please!
> Thanks very much!
>
> void printIntefaces()
> {
> api_main_t * am = &api_main;
> vl_api_sw_interface_dump_t message;
> M_NOALLOC(SW_INTERFACE_DUMP);
> message.name_filter_valid = 0;
> strcpy(message.name_filter, "Gigabit");
> vac_write((char *)&message, sizeof(message));
> char* pMsg = NULL;
> int nLen = 0;
> int ret = 0;
> int nCount = 0;
> do {
> printf("begin interface read .. \n");
> ret = vac_read(&pMsg, &nLen, 1);
> printf("begin interface end .. \n");
> if(ret != -1)
> {
> vl_api_sw_interface_details_t* pSV = (vl_api_sw_interface_details_t*)pMsg;
> printf("%lu:%s \n", ntohl(pSV->sw_if_index), pSV->interface_name);
> vac_free(pMsg);
> nCount += 1;
> }
> else{
> break;
> }
> }while(1);
> printf("get real count[%d] \n", nCount);
> }
>
> wangchuan...@163.com
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