[libvirt] [PATCH 1/3] Introduce virDomainOpenGraphicsFD API

[Eric Blake]

On 08/25/2014 12:22 PM, Ján Tomko wrote:
> Define the public API implementation and declare internal
> driver prototype.
> ---
>  include/libvirt/libvirt.h.in |  5 ++++
>  src/driver.h                 |  7 ++++++
>  src/libvirt.c                | 58 ++++++++++++++++++++++++++++++++++++++++++++
>  src/libvirt_public.syms      |  5 ++++
>  4 files changed, 75 insertions(+)
> 
> diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
> index 47ea695..153b386 100644
> --- a/include/libvirt/libvirt.h.in
> +++ b/include/libvirt/libvirt.h.in
> @@ -5321,6 +5321,11 @@ int virDomainOpenGraphics(virDomainPtr dom,
>                            int fd,
>                            unsigned int flags);
>  
> +int virDomainOpenGraphicsFD(virDomainPtr dom,
> +                            unsigned int idx,
> +                            int *fd,
> +                            unsigned int flags);

Wait.  Why are we returning 0/-1 and making the user pass in a pointer
to get the fd?


> + * @fd: returned file descriptor
> + * @flags: bitwise-OR of virDomainOpenGraphicsFlags
> + *
> + * This will create a socket pair connected to the graphics backend of @dom.
> + * One pair will be returned as @fd.
> + * If @dom has multiple graphics backends configured, then @idx will determine
> + * which one is opened, starting from @idx 0.
> + *
> + * To disable any authentication, pass the VIR_DOMAIN_OPEN_GRAPHICS_SKIPAUTH
> + * constant for @flags.
> + *
> + * This method can only be used when connected to a local
> + * libvirt hypervisor, over a UNIX domain socket. Attempts
> + * to use this method over a TCP connection will always fail
> + *
> + * Returns 0 on success, -1 on failure
> + */
> +int
> +virDomainOpenGraphicsFD(virDomainPtr dom,
> +                        unsigned int idx,
> +                        int *fd,
> +                        unsigned int flags)

I'd much rather us return -1 on failure, and the actual fd on success,
with a signature:

int virDomainOpenGraphicsFD(virDomainPtr dom, unsigned int idx, unsigned
int flags)

Let's change that now, before we bake the mistake into the release candidate

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

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