linux-kernel - Re: [RFC PATCH v10 21/50] bpf tools: Introduce accessors for struct bpf

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Date:	Tue, 7 Jul 2015 16:39:42 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	ast@...mgrid.com, brendan.d.gregg@...il.com, daniel@...earbox.net,
	namhyung@...nel.org, masami.hiramatsu.pt@...achi.com,
	paulus@...ba.org, a.p.zijlstra@...llo.nl, mingo@...hat.com,
	jolsa@...nel.org, dsahern@...il.com, linux-kernel@...r.kernel.org,
	lizefan@...wei.com, hekuang@...wei.com, xiakaixu@...wei.com,
	pi3orama@....com
Subject: Re: [RFC PATCH v10 21/50] bpf tools: Introduce accessors for struct
 bpf_object

Em Wed, Jul 01, 2015 at 02:14:09AM +0000, Wang Nan escreveu:
> This patch add an accessor which allows caller to get count of programs
> in an object file.
> 
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> Acked-by: Alexei Starovoitov <ast@...mgrid.com>
> ---
>  tools/lib/bpf/libbpf.c | 9 +++++++++
>  tools/lib/bpf/libbpf.h | 3 +++
>  2 files changed, 12 insertions(+)
> 
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index e4c5f07..1c210fb 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -936,6 +936,15 @@ void bpf_object__close(struct bpf_object *obj)
>  	free(obj);
>  }
>  
> +int bpf_object__get_prog_cnt(struct bpf_object *obj, size_t *pcnt)
> +{
> +	if (!obj || !pcnt)
> +		return -EINVAL;
> +
> +	*pcnt = obj->nr_programs;
> +	return 0;
> +}
> +

Ditto, what is wrong with:

int bpf_object__nr_programs(struct bpf_object *obj)
{
	return obj ? obj->nr_programs : -EINVAL;
}

- Arnaldo

>  struct bpf_program *
>  bpf_program__next(struct bpf_program *prev, struct bpf_object *obj)
>  {
> diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
> index 9e0e102..a20ae2e 100644
> --- a/tools/lib/bpf/libbpf.h
> +++ b/tools/lib/bpf/libbpf.h
> @@ -35,6 +35,9 @@ void bpf_object__close(struct bpf_object *object);
>  int bpf_object__load(struct bpf_object *obj);
>  int bpf_object__unload(struct bpf_object *obj);
>  
> +/* Accessors of bpf_object */
> +int bpf_object__get_prog_cnt(struct bpf_object *obj, size_t *pcnt);
> +
>  /* Accessors of bpf_program. */
>  struct bpf_program;
>  struct bpf_program *bpf_program__next(struct bpf_program *prog,
> -- 
> 1.8.3.4
--
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