linux-kernel - [PATCH 6/9] libtracefs: Add APIs tracefs_hist_data_keys/value

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Date:   Tue, 10 Aug 2021 16:48:15 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-trace-devel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Tom Zanussi <zanussi@...nel.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Clark Williams <williams@...hat.com>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>
Subject: [PATCH 6/9] libtracefs: Add APIs tracefs_hist_data_keys/value_names()

From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>

Add the APIs

  tracefs_hist_data_key_names()
  tracefs_hist_data_value_names()

To get the names of the keys and values respectively.

Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
 include/tracefs.h       |  3 +++
 src/tracefs-hist-data.c | 30 ++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/include/tracefs.h b/include/tracefs.h
index 6fb66c44afc7..7aa6a3e5673a 100644
--- a/include/tracefs.h
+++ b/include/tracefs.h
@@ -428,6 +428,9 @@ struct tracefs_hist_data **tracefs_hist_data_read(struct tracefs_instance *insta
 void tracefs_hist_data_free(struct tracefs_hist_data *hdata);
 void tracefs_hist_data_free_list(struct tracefs_hist_data **hdata_list);
 
+char **tracefs_hist_data_key_names(struct tracefs_hist_data *hdata);
+char **tracefs_hist_data_value_names(struct tracefs_hist_data *hdata);
+
 struct tracefs_synth;
 
 /*
diff --git a/src/tracefs-hist-data.c b/src/tracefs-hist-data.c
index ab1ae824f59b..c93c27453255 100644
--- a/src/tracefs-hist-data.c
+++ b/src/tracefs-hist-data.c
@@ -1093,3 +1093,33 @@ tracefs_hist_data_read(struct tracefs_instance *instance,
 	return NULL;
 }
 
+/**
+ * tracefs_hist_data_key_names - return key names
+ * @hdata: The hist data descriptor to get the names from
+ *
+ * Returns a copy of the key names of the keys. The list of keys
+ * will be in the same order as the keys are listed.
+ * Returns NULL on error.
+ *
+ * Must be freed with tracefs_list_free();
+ */
+char **tracefs_hist_data_key_names(struct tracefs_hist_data *hdata)
+{
+	return tracefs_list_dup(hdata->key_names);
+}
+
+/**
+ * tracefs_hist_data_value_names - return value names
+ * @hdata: The hist data descriptor to get the names from
+ *
+ * Returns a copy of the value names of the keys. The list of keys
+ * will be in the same order as the values are listed.
+ * Returns NULL on error.
+ *
+ * Must be freed with tracefs_list_free();
+ */
+char **tracefs_hist_data_value_names(struct tracefs_hist_data *hdata)
+{
+	return tracefs_list_dup(hdata->value_names);
+}
+
-- 
2.30.2