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Re: [Qemu-devel] error reporting in functions

From: Eric Blake
Subject: Re: [Qemu-devel] error reporting in functions
Date: Wed, 12 Oct 2016 15:55:45 -0500
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On 10/12/2016 10:47 AM, Vladimir Sementsov-Ogievskiy wrote:
> HI all!
> My questions is: what are general recommendations in Qemu for return
> code, if we have Error **errp?
> What should I prefer: errp, duplicated by int return code, or void
> functions with errp?

Markus has already had several threads commenting on this very topic in
the past.  A lot of code uses void return, but some newer code is using
an int return for simplifying the call-sites (and glib prefers the int
rather than void return, as well).  Markus was playing with a Coccinelle
script to see how painful a bulk-conversion of the code base would be,
but it is probably stalled behind more pressing work at the moment.

> void + errp seems good, just to not duplicate things. But it has a
> disadvantage of necessity of "local_err" and "error_propagate" in caller
> function, if its behaviour depends on callee function success...

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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