linux-kernel - Re: [PATCH v3 7/9] perf header: Add check_perf

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Date:	Mon, 24 Sep 2012 13:01:51 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Feng Tang <feng.tang@...el.com>
Cc:	mingo@...e.hu, a.p.zijlstra@...llo.nl, andi@...stfloor.org,
	namhyung@...nel.org, dsahern@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 7/9] perf header: Add check_perf_magic() func

Em Mon, Sep 24, 2012 at 11:24:09PM +0800, Feng Tang escreveu:
> With this func, other modules can basically check whether a file
> is a legal perf data file by checking its first 8 bytes aginst
> all possible perf magic nunbers.

Please consider submitting a patch to http://www.darwinsys.com/file/ :-)

- Arnaldo
 
> Signed-off-by: Feng Tang <feng.tang@...el.com>
> ---
>  tools/perf/util/header.c |   11 +++++++++++
>  tools/perf/util/header.h |    1 +
>  2 files changed, 12 insertions(+), 0 deletions(-)
> 
> diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> index ad72b28..555cb68 100644
> --- a/tools/perf/util/header.c
> +++ b/tools/perf/util/header.c
> @@ -2174,6 +2174,17 @@ static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)
>  	return -1;
>  }
>  
> +/* Return 0 if matched */
> +int check_perf_magic(u64 magic)
> +{
> +	if (!memcmp(&magic, __perf_magic1, sizeof(magic))
> +		|| magic == __perf_magic2
> +		|| magic == __perf_magic2_sw)
> +		return 0;
> +
> +	return -1;
> +}
> +
>  static int check_magic_endian(u64 magic, uint64_t hdr_sz,
>  			      bool is_pipe, struct perf_header *ph)
>  {
> diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
> index 58de08b..af1a51c 100644
> --- a/tools/perf/util/header.h
> +++ b/tools/perf/util/header.h
> @@ -131,6 +131,7 @@ int perf_event__synthesize_build_id(struct perf_tool *tool,
>  int perf_event__process_build_id(struct perf_tool *tool,
>  				 union perf_event *event,
>  				 struct perf_session *session);
> +int check_perf_magic(u64 magic);
>  
>  /*
>   * arch specific callback
> -- 
> 1.7.1
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