netdev - Re: [PATCH net-next 09/12] tools: bpftool: turn err() and info() macros into functions

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Date:   Mon, 23 Oct 2017 22:33:35 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        netdev@...r.kernel.org
CC:     oss-drivers@...ronome.com, alexei.starovoitov@...il.com,
        Quentin Monnet <quentin.monnet@...ronome.com>
Subject: Re: [PATCH net-next 09/12] tools: bpftool: turn err() and info()
 macros into functions

On 10/23/2017 06:24 PM, Jakub Kicinski wrote:
> From: Quentin Monnet <quentin.monnet@...ronome.com>
>
> Turn err() and info() macros into functions.
>
> In order to avoid naming conflicts with variables in the code, rename
> them as p_err() and p_info() respectively.
>
> The behavior of these functions is similar to the one of the macros for
> plain output. However, when JSON output is requested, these macros
> return a JSON-formatted "error" object instead of printing a message to
> stderr.
>
> To handle error messages correctly with JSON, a modification was brought
> to their behavior nonetheless: the functions now append a end-of-line
> character at the end of the message. This way, we can remove end-of-line
> characters at the end of the argument strings, and not have them in the
> JSON output.
>
> All error messages are formatted to hold in a single call to p_err(), in
> order to produce a single JSON field.
>
> Signed-off-by: Quentin Monnet <quentin.monnet@...ronome.com>
> Acked-by: Jakub Kicinski <jakub.kicinski@...ronome.com>

Acked-by: Daniel Borkmann <daniel@...earbox.net>