Sorry for that link. The base code used was from
https://curl.se/libcurl/c/multi-post.html. It is modified as below:
if(curl)
{
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
multi_handle = curl_multi_init();
/* Create the form */
form = curl_mime_init(curl);
/* Fill in the file upload field */
field = curl_mime_addpart(form);
curl_mime_name(field, "files");
curl_mime_filedata(field, fileName);
/* initialize custom header list (stating that Expect: 100-continue
is not
wanted */
headerlist = curl_slist_append(headerlist, buf);
/* what URL that receives this POST */
curl_easy_setopt(curl, CURLOPT_URL, webUrl);
curl_easy_setopt(curl, CURLOPT_XFERINFOFUNCTION, progress_callback);
list = curl_slist_append(list, "Shoesize: 10");
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);
curl_easy_setopt(curl, CURLOPT_MIMEPOST, form);
curl_multi_add_handle(multi_handle, curl);
while(still_running)
{
CURLMsg *msg;
int queued;
CURLMcode mc = curl_multi_perform(multi_handle, &still_running);
printf("\n\rMulti Perform exit with code %d, still running
%d\n\r", mc, still_running);
if(still_running)
{
/* wait for activity, timeout or "nothing" */
mc = curl_multi_poll(multi_handle, NULL, 0, 1000, NULL);
}
printf("\n\rMulti poll : %d", mc);
if(mc)
break;
do
{
msg = curl_multi_info_read(multi_handle, &queued);
printf("\n\r Queued %d \n\r",queued);
if(msg)
{
printf("\n\rCurl code %d\n\r", msg->data.result);
if(msg->msg == CURLMSG_DONE)
{
/* a transfer ended */
fprintf(stderr, "Transfer completed\n");
}
}
} while(msg);
}
res = curl_easy_getinfo(curl, CURLINFO_OS_ERRNO, &error);
printf("\n\rERRNO %ld\n\r", error);
curl_multi_remove_handle(multi_handle, curl);
curl_multi_cleanup(multi_handle);
/* always cleanup */
curl_easy_cleanup(curl);
/* then cleanup the form */
curl_mime_free(form);
/* free slist */
curl_slist_free_all(headerlist);
}
printf("\n\r");
return 0;
}
In the absence of the server running, below is the output on the console:
* Initializing NSS with certpath: none
Multi Perform exit with code 0, still running 1
Multi poll : 0
Queued 0
Multi Perform exit with code 0, still running 1
Multi poll : 0
Queued 0
* Trying 192.168.65.2:80...
* TCP_NODELAY set
Multi Perform exit with code 0, still running 1
Multi poll : 0
Queued 0
Multi Perform exit with code 0, still running 1
Multi poll : 0
Queued 0
* Connected to host.docker.internal (192.168.65.2) port 80 (#0)
> POST /upload HTTP/1.1
Host: host.docker.internal
Accept: */*
Shoesize: 10
Content-Length: 321
Content-Type: multipart/form-data;
boundary=------------------------b2b856525299ec0a
* We are completely uploaded and fine
Multi Perform exit with code 0, still running 1
Multi poll : 0
Queued 0
Multi Perform exit with code 0, still running 1
Multi poll : 0
Queued 0
Multi Perform exit with code 0, still running 1
Multi poll : 0
Queued 0
Multi Perform exit with code 0, still running 1
Multi poll : 0
Queued 0
* Mark bundle as not supporting multiuse
* HTTP 1.0, assume close after body
< HTTP/1.0 403 connecting to host.docker.internal:80: connecting to
127.0.0.1:80: dial tcp 127.0.0.1:80: connectex: No c
onnection could be made because the target machine actively refused it.
< Connection: close
<
connecting to host.docker.internal:80: connecting to 127.0.0.1:80: dial tcp
127.0.0.1:80: connectex: No connection could be made because t
he target machine actively refused it.
Multi Perform exit with code 0, still running 1
Multi poll : 0
Queued 0
* Closing connection 0
Multi Perform exit with code 0, still running 0
Multi poll : 0
Queued 0
Curl code 0
Transfer completed
Queued 0
ERRNO 0
If we see the output, all the methods are returning 0, although there is a
message (due to verbose enabled) that the machine refused the connection.
On Wed, Jan 3, 2024 at 2:02 PM Ray Satiro via curl-library <
[email protected]> wrote:
> On 1/3/2024 3:17 AM, Ali Nasir via curl-library wrote:
>
> I am trying to upload a file to an end point using multi interface.
> Example code used is https://curl.se/libcurl/c/postit2.html
> However, i see that when the server is down, there is no error reported
> from any of the curl interfaces.
>
> If i perform the same operation via the curl command from the shell, i get
> the return code as 7. But all the multi interfaces like info_read and
> mulit_perform return CURLE_OK.
> Can anyone guide how to detect failures with libcurl. Specially when the
> server is down.
>
>
> That example uses curl_easy_perform not curl_multi_perform so there must
> be some changes that you made. curl_multi_info_read should return the
> transfer result code (CURLcode) in data.result. [1][2]
>
> Also you could enable verbose mode to see if that's how the transfer is
> actually failing. [3]
>
> [1]: https://curl.se/libcurl/c/curl_multi_info_read.html
> [2]: https://curl.se/libcurl/c/libcurl-errors.html
> [3]: https://curl.se/libcurl/c/CURLOPT_VERBOSE.html
>
>
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