Re: [Qemu-devel] [RFC v3 PATCH 07/45] multi-process: define proxy-link object

["Daniel P. Berrangé" <berrange@redhat.com>]

On Tue, Sep 03, 2019 at 04:37:33PM -0400, Jagannathan Raman wrote:
> Defines proxy-link object which forms the communication link between
> QEMU & emulation program.
> Adds functions to configure members of proxy-link object instance.
> Adds functions to send and receive messages over the communication
> channel.
> Adds GMainLoop to handle events received on the communication channel.
> 
> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
> Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
> ---
>  v1 -> v2:
>    - Use default context for main loop instead of a new context
> 
>  v2 -> v3:
>    - Enabled multi-channel support in the communication link
> 
>  include/glib-compat.h   |   4 +
>  include/io/proxy-link.h | 147 ++++++++++++++++++++++++
>  io/Makefile.objs        |   2 +
>  io/proxy-link.c         | 292 ++++++++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 445 insertions(+)
>  create mode 100644 include/io/proxy-link.h
>  create mode 100644 io/proxy-link.c
> 
> diff --git a/include/glib-compat.h b/include/glib-compat.h
> index 1291628..6189b9a 100644
> --- a/include/glib-compat.h
> +++ b/include/glib-compat.h
> @@ -19,12 +19,16 @@
>  /* Ask for warnings for anything that was marked deprecated in
>   * the defined version, or before. It is a candidate for rewrite.
>   */
> +#ifndef GLIB_VERSION_MIN_REQUIRED
>  #define GLIB_VERSION_MIN_REQUIRED GLIB_VERSION_2_40
> +#endif
>  
>  /* Ask for warnings if code tries to use function that did not
>   * exist in the defined version. These risk breaking builds
>   */
> +#ifndef GLIB_VERSION_MAX_ALLOWED
>  #define GLIB_VERSION_MAX_ALLOWED GLIB_VERSION_2_40
> +#endif

This does not look good. This header can only be included
once thanks to the #ifndef QEMU_GLIB_COMPAT_H. So the fact
that you need these conditionals is a hint of a bug elsewhere
in the code related to glib usage.


> diff --git a/include/io/proxy-link.h b/include/io/proxy-link.h
> new file mode 100644
> index 0000000..ee78cdd
> --- /dev/null
> +++ b/include/io/proxy-link.h
> @@ -0,0 +1,147 @@
> +/*
> + * Communication channel between QEMU and remote device process
> + *
> + * Copyright 2019, Oracle and/or its affiliates.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a copy
> + * of this software and associated documentation files (the "Software"), to deal
> + * in the Software without restriction, including without limitation the rights
> + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
> + * copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
> + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
> + * THE SOFTWARE.
> + */
> +
> +#ifndef PROXY_LINK_H
> +#define PROXY_LINK_H
> +
> +#include <stddef.h>
> +#include <stdint.h>
> +#include <glib.h>

I'm guessing this is the cause - nothing should be including this
directly - it is pulled  in for you via qemu/osdep.h

> +#include <pthread.h>
> +
> +#include "qemu/osdep.h"
> +#include "qom/object.h"
> +#include "qemu/thread.h"

Regards,
Daniel
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