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SubjectRe: [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@intel.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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