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    Subject[PATCH 20/25] perf tools: Add is_perf_data function
    Date
    Adding is_perf_data function that returns true if
    the given path is perf data file. It will be used
    in following patches.

    Acked-by: Ian Rogers <irogers@google.com>
    Signed-off-by: Jiri Olsa <jolsa@kernel.org>
    ---
    tools/perf/util/data.c | 19 +++++++++++++++++++
    tools/perf/util/data.h | 1 +
    2 files changed, 20 insertions(+)

    diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
    index 05bbcb663c41..f29af4fc3d09 100644
    --- a/tools/perf/util/data.c
    +++ b/tools/perf/util/data.c
    @@ -492,3 +492,22 @@ char *perf_data__kallsyms_name(struct perf_data *data)

    return kallsyms_name;
    }
    +
    +bool is_perf_data(const char *path)
    +{
    + bool ret = false;
    + FILE *file;
    + u64 magic;
    +
    + file = fopen(path, "r");
    + if (!file)
    + return false;
    +
    + if (fread(&magic, 1, 8, file) < 8)
    + goto out;
    +
    + ret = is_perf_magic(magic);
    +out:
    + fclose(file);
    + return ret;
    +}
    diff --git a/tools/perf/util/data.h b/tools/perf/util/data.h
    index c563fcbb0288..62a3e66fbee8 100644
    --- a/tools/perf/util/data.h
    +++ b/tools/perf/util/data.h
    @@ -98,4 +98,5 @@ int perf_data__update_dir(struct perf_data *data);
    unsigned long perf_data__size(struct perf_data *data);
    int perf_data__make_kcore_dir(struct perf_data *data, char *buf, size_t buf_sz);
    char *perf_data__kallsyms_name(struct perf_data *data);
    +bool is_perf_data(const char *path);
    #endif /* __PERF_DATA_H */
    --
    2.26.2
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