[LTP] [PATCH] aio_cancel_3-1: Rewrite test

[Petr Vorel]

Hi Martin,

> The test schedules multiple async writes into a file and then hopes that
> at least one will block long enough that it can be canceled
> before completion. Use a socket pair instead of a file to force async
> writes to block indefinitely and make sure at least one can be canceled.
> Then cancel all requests on the input socket and check that all signals
> have been delivered and the expected number of requests has been canceled.
> This fixes a race condition where aio_cancel() could be delayed until
> after all writes have already completed, making the test unreliable.

Thanks for the fix, merged!
Also thank you for additional error log output and formatting cleanup.

I suppose some of the tests still need to be fixed ([46]-1.c queue a lot of
aio_write()).

Kind regards,
Petr