[6/9] libtracefs: Add APIs tracefs_hist_data_keys/value_names()

Commit Message

Steven Rostedt Aug. 10, 2021, 8:48 p.m. UTC

From: "Steven Rostedt (VMware)" <[e-mail]>

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) <[e-mail]>
---
 include/tracefs.h       |  3 +++
 src/tracefs-hist-data.c | 30 ++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

Patch

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);
+}
+