Re: [PATCH v6 6/8] util: introduce qemu_open and qemu_create with error reporting

[Richard Henderson <richard.henderson@linaro.org>]

On 9/3/20 8:22 AM, Daniel P. Berrangé wrote:
> qemu_open_old() works like open(): set errno and return -1 on failure.
> It has even more failure modes, though.  Reporting the error clearly
> to users is basically impossible for many of them.
> 
> Our standard cure for "errno is too coarse" is the Error object.
> Introduce two new helper methods:
> 
>   int qemu_open(const char *name, int flags, Error **errp);
>   int qemu_create(const char *name, int flags, mode_t mode, Error **errp);
> 
> Note that with this design we no longer require or even accept the
> O_CREAT flag. Avoiding overloading the two distinct operations
> means we can avoid variable arguments which would prevent 'errp' from
> being the last argument. It also gives us a guarantee that the 'mode' is
> given when creating files, avoiding a latent security bug.
> 
> Reviewed-by: Markus Armbruster <armbru@redhat.com>
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> ---

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~