Re: [PATCH 05/14] libxl: xc_physdev_map return -1 and populate errno.

[Ian Campbell <ian.campbell@citrix.com>]

On Mon, 2015-03-16 at 11:39 -0400, Konrad Rzeszutek Wilk wrote:
> The users of these (qemu) check for a negative value
> so we are safe in regards to that. However they
> also use the return value to inform the user of the
> error.

IIRC I saw a qemu patch go past to fix the callers?

> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Acked-by: Ian Campbell <ian.campbell@citrix.com>

> ---
>  tools/libxc/xc_physdev.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/libxc/xc_physdev.c b/tools/libxc/xc_physdev.c
> index cf02d85..9b064b8 100644
> --- a/tools/libxc/xc_physdev.c
> +++ b/tools/libxc/xc_physdev.c
> @@ -43,8 +43,10 @@ int xc_physdev_map_pirq(xc_interface *xch,
>      struct physdev_map_pirq map;
>  
>      if ( !pirq )
> -        return -EINVAL;
> -
> +    {
> +        errno = EINVAL;
> +        return -1;
> +    }
>      memset(&map, 0, sizeof(struct physdev_map_pirq));
>      map.domid = domid;
>      map.type = MAP_PIRQ_TYPE_GSI;
> @@ -72,8 +74,10 @@ int xc_physdev_map_pirq_msi(xc_interface *xch,
>      struct physdev_map_pirq map;
>  
>      if ( !pirq )
> -        return -EINVAL;
> -
> +    {
> +        errno = EINVAL;
> +        return -1;
> +    }
>      memset(&map, 0, sizeof(struct physdev_map_pirq));
>      map.domid = domid;
>      map.type = MAP_PIRQ_TYPE_MSI;