On Sun, 11 Feb 2018, Jeremy Nicoll wrote:

> Curl probably issues a variety of return codes in different circumstances.
> They'll be listed somewhere with their numeric values and symbolic
> names.

Yeps: https://curl.haxx.se/docs/manpage.html#EXIT

> If you were using a language (eg C ?) which had been told to read the list
> of symbolic names, you could test for a returned code being equal to
> CURLE_OK (or any other symbolic value) and the C compiler would know that
> that meant 0 (or whatever).

The libcurl error codes are listed here:
https://curl.haxx.se/libcurl/c/libcurl-errors.html

-- 
  / daniel.haxx.se
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