linux-kernel - [PATCH 4/5] perf data: Add has_kcore

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Message-Id: <20220520132404.25853-5-adrian.hunter@intel.com>
Date:   Fri, 20 May 2022 16:24:03 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] perf data: Add has_kcore_dir()

Add a helper function has_kcore_dir(), so that perf inject can determine if
it needs to keep the kcore_dir.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/util/data.c | 14 ++++++++++++++
 tools/perf/util/data.h |  1 +
 2 files changed, 15 insertions(+)

diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index a5ace2bbc28d..caabeac24c69 100644
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -479,6 +479,20 @@ int perf_data__make_kcore_dir(struct perf_data *data, char *buf, size_t buf_sz)
 	return mkdir(buf, S_IRWXU);
 }
 
+bool has_kcore_dir(const char *path)
+{
+	char *kcore_dir;
+	int ret;
+
+	if (asprintf(&kcore_dir, "%s/kcore_dir", path) < 0)
+		return false;
+
+	ret = access(kcore_dir, F_OK);
+
+	free(kcore_dir);
+	return !ret;
+}
+
 char *perf_data__kallsyms_name(struct perf_data *data)
 {
 	char *kallsyms_name;
diff --git a/tools/perf/util/data.h b/tools/perf/util/data.h
index 1402d9657ef2..7de53d6e2d7f 100644
--- a/tools/perf/util/data.h
+++ b/tools/perf/util/data.h
@@ -99,6 +99,7 @@ void perf_data__close_dir(struct perf_data *data);
 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);
+bool has_kcore_dir(const char *path);
 char *perf_data__kallsyms_name(struct perf_data *data);
 bool is_perf_data(const char *path);
 #endif /* __PERF_DATA_H */
-- 
2.25.1