tests: make the unit test result type `CURLcode`

Before this patch, the result code was a mixture of `int` and
`CURLcode`.

Also adjust casts and fix a couple of minor issues fou

tests: make the unit test result type `CURLcode`

Before this patch, the result code was a mixture of `int` and
`CURLcode`.

Also adjust casts and fix a couple of minor issues found along the way.

Cherry-picked from #13489
Closes #13600

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copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.

This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.

Closes #8869

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copyright: update copyright year ranges to 2021

lib1564.c: enable last wakeup test part on Windows

Suggested-by: Gergely Nagy
Reviewed-by: Jay Satiro
Reviewed-by: Marcel Raad

Closes #6245

lib1564/5: verify that curl_multi_wakeup returns OK

curl.se: new home

Closes #6172

lib1564: reduce number of mid-wait wakeup calls

This test does A LOT of *wakeup() calls and then calls curl_multi_poll()
twice. The first *poll() is then expected to return early and the

lib1564: reduce number of mid-wait wakeup calls

This test does A LOT of *wakeup() calls and then calls curl_multi_poll()
twice. The first *poll() is then expected to return early and the second
not - as the first is supposed to drain the socketpair pipe.

It turns out however that when given "excessive" amounts of writes to
the pipe, some operating systems (the Solaris based are known) will
return EAGAIN before the pipe is drained, which in our test case causes
the second *poll() call to also abort early.

This change attempts to avoid the OS-specific behaviors in the test by
reducing the amount of wakeup calls from 1234567 to 10.

Reported-by: Andy Fiddaman
Fixes #5037
Closes #5058

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multi: add curl_multi_wakeup()

This commit adds curl_multi_wakeup() which was previously in the TODO
list under the curl_multi_unblock name.

On some platforms and with some conf

multi: add curl_multi_wakeup()

This commit adds curl_multi_wakeup() which was previously in the TODO
list under the curl_multi_unblock name.

On some platforms and with some configurations this feature might not be
available or can fail, in these cases a new error code
(CURLM_WAKEUP_FAILURE) is returned from curl_multi_wakeup().

Fixes #4418
Closes #4608

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