linux-kernel - [PATCH 20/25] perf tools: Add is_perf

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Message-Id: <20201123230512.2097312-21-jolsa@kernel.org>
Date:   Tue, 24 Nov 2020 00:05:07 +0100
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Song Liu <songliubraving@...com>,
        Stephane Eranian <eranian@...gle.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: [PATCH 20/25] perf tools: Add is_perf_data function

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@...gle.com>
Signed-off-by: Jiri Olsa <jolsa@...nel.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