Confusion with CURLINFO_OS_ERRNO and its example usage in libcurl documentation

[farazrbx]

I'm having some trouble understanding how to use CURLINFO_OS_ERRNO in my app.
Here's the example code snippet that I've copied from CURLINFO_OS_ERRNO

long error;
res = curl_easy_getinfo(curl, CURLINFO_OS_ERRNO, &error);
if (res && error) {
    printf("Errno: %ld\n", error);
}

However, the documentation also states that curl_easy_getinfo returns CURLE_OK if the option is supported. But CURLE_OK is defined as 0. So is this a mistake in the example code? Do we need to change the if statement to res == CURLE_OK && error?

[jay]

res = curl_easy_getinfo(curl, CURLINFO_OS_ERRNO, &error);
if (res && error) {

That's a bug, I will take a look at the CURLINFO docs

Do we need to change the if statement to res == CURLE_OK && error?

yes

[jay]

it's a bug, i found a few, please take further discussion to #13559