[Bugs] [Bug 1409767] The API glfs_h_poll_upcall cannot return 0 and set an errno to denote no entries

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1409767

Niels de Vos <ndevos at redhat.com> changed:

           What    |Removed                     |Added
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                 CC|                            |avishwan at redhat.com,
                   |                            |ndevos at redhat.com
              Flags|                            |needinfo?(avishwan at redhat.c
                   |                            |om)



--- Comment #1 from Niels de Vos <ndevos at redhat.com> ---
My preference goes to setting errno to 0 in case the of success. But according
to the man-page, this needs to be done by the application before calling the
function (glfs_h_pull_upcall() in this case).

Applications checking for the returned cbk object are taking a pretty safe
route :)

I am not sure what the implications would be to return -1 when there are no
upcalls pending. This needs to be investigated among the users of the API. If
this breaks applications, we can add a versioned symbol, but that adds some
maintenance overhead as well...

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