Re: [Qemu-devel] [PATCH 1/3] qemu-img: fix img_commit() error return value

[Eric Blake]

On 08/26/2014 12:17 PM, Stefan Hajnoczi wrote:
> The img_commit() return value is a process exit code.  Use 1 for failure
> instead of -1.  The other failure paths in this function already use 1.
> 
> Signed-off-by: Stefan Hajnoczi <address@hidden>
> ---
>  qemu-img.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/qemu-img.c b/qemu-img.c
> index c843420..dc3adb5 100644
> --- a/qemu-img.c
> +++ b/qemu-img.c
> @@ -771,7 +771,7 @@ static int img_commit(int argc, char **argv)
>      ret = bdrv_parse_cache_flags(cache, &flags);
>      if (ret < 0) {
>          error_report("Invalid cache option: %s", cache);
> -        return -1;
> +        return 1;

Nothing against this patch (you're consistent with the surrounding code,
and most of qemu for that matter), but it highlights why I'm a fan of
'return EXIT_FAILURE' instead of 'return 1' in functions that return an
exit status, because that makes it a lot more obvious _why_ I'm
returning a non-negative number to represent failure.

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

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