If the instance owns two mask objects, we no longer need to
dynamically allocate memory in tracefs_options_get_supported() and
tracefs_options_get_enabled(). This will simplify the code on the
caller side, since the user is no longer responsible for freeing
those masks.
Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@xxxxxxxxx>
---
Documentation/libtracefs-option-get.txt | 4 +---
include/tracefs.h | 6 +++---
src/tracefs-instance.c | 24 ++++++++++++------------
3 files changed, 16 insertions(+), 18 deletions(-)
diff --git a/Documentation/libtracefs-option-get.txt b/Documentation/libtracefs-option-get.txt
index 9b3cb56..3290f24 100644
--- a/Documentation/libtracefs-option-get.txt
+++ b/Documentation/libtracefs-option-get.txt
@@ -52,14 +52,13 @@ EXAMPLE
--
#include <tracefs.h>
...
-struct tracefs_options_mask *options;
+const struct tracefs_options_mask *options;
...
options = tracefs_options_get_supported(NULL);
if (!options) {
/* Failed to get supported options */
} else {
...
- free(options);
}
...
options = tracefs_options_get_enabled(NULL);
@@ -67,7 +66,6 @@ if (!options) {
/* Failed to get options, enabled in the top instance */
} else {
...
- free(options);
}
...
diff --git a/include/tracefs.h b/include/tracefs.h
index 0665e8d..9efa91a 100644
--- a/include/tracefs.h
+++ b/include/tracefs.h
@@ -132,11 +132,11 @@ enum tracefs_option_id {
#define TRACEFS_OPTION_MAX (TRACEFS_OPTION_VERBOSE + 1)
struct tracefs_options_mask;
-bool tracefs_option_is_set(struct tracefs_options_mask *options,
+bool tracefs_option_is_set(const struct tracefs_options_mask *options,
enum tracefs_option_id id);
-struct tracefs_options_mask *tracefs_options_get_supported(struct tracefs_instance *instance);
+const struct tracefs_options_mask *tracefs_options_get_supported(struct tracefs_instance *instance);
bool tracefs_option_is_supported(struct tracefs_instance *instance, enum tracefs_option_id id);
-struct tracefs_options_mask *tracefs_options_get_enabled(struct tracefs_instance *instance);
+const struct tracefs_options_mask *tracefs_options_get_enabled(struct tracefs_instance *instance);
bool tracefs_option_is_enabled(struct tracefs_instance *instance, enum tracefs_option_id id);
int tracefs_option_enable(struct tracefs_instance *instance, enum tracefs_option_id id);
int tracefs_option_diasble(struct tracefs_instance *instance, enum tracefs_option_id id);
diff --git a/src/tracefs-instance.c b/src/tracefs-instance.c
index 49645eb..9cb4b6d 100644
--- a/src/tracefs-instance.c
+++ b/src/tracefs-instance.c
@@ -27,6 +27,8 @@ struct tracefs_instance {
char *trace_dir;
char *name;
int flags;
+ struct tracefs_options_mask supported_opts;
+ struct tracefs_options_mask enabled_opts;
};
/**
@@ -695,9 +697,8 @@ static struct tracefs_options_mask *trace_get_options(struct tracefs_instance *i
DIR *dir = NULL;
long long val;
- bitmask = calloc(1, sizeof(struct tracefs_options_mask));
- if (!bitmask)
- return NULL;
+ bitmask = enabled? &instance->enabled_opts : &instance->supported_opts;
+
dname = tracefs_instance_get_file(instance, "options");
if (!dname)
goto error;
@@ -727,7 +728,6 @@ error:
if (dir)
closedir(dir);
tracefs_put_tracing_file(dname);
- free(bitmask);
return NULL;
}
@@ -735,10 +735,10 @@ error:
* tracefs_options_get_supported - Get all supported trace options in given instance
* @instance: ftrace instance, can be NULL for the top instance
*
- * Returns allocated bitmask structure with all trace options, supported in given
- * instance, or NULL in case of an error. The returned structure must be freed with free()
+ * Returns bitmask structure with all trace options, supported in given instance,
+ * or NULL in case of an error.
*/
-struct tracefs_options_mask *tracefs_options_get_supported(struct tracefs_instance *instance)
+const struct tracefs_options_mask *tracefs_options_get_supported(struct tracefs_instance *instance)
{
return trace_get_options(instance, false);
}
@@ -747,10 +747,10 @@ struct tracefs_options_mask *tracefs_options_get_supported(struct tracefs_instan
* tracefs_options_get_enabled - Get all currently enabled trace options in given instance
* @instance: ftrace instance, can be NULL for the top instance
*
- * Returns allocated bitmask structure with all trace options, enabled in given
- * instance, or NULL in case of an error. The returned structure must be freed with free()
+ * Returns allocated bitmask structure with all trace options, enabled in given instance,
+ * or NULL in case of an error.
*/
-struct tracefs_options_mask *tracefs_options_get_enabled(struct tracefs_instance *instance)
+const struct tracefs_options_mask *tracefs_options_get_enabled(struct tracefs_instance *instance)
{
return trace_get_options(instance, true);
}
@@ -758,7 +758,7 @@ struct tracefs_options_mask *tracefs_options_get_enabled(struct tracefs_instance
static int trace_config_option(struct tracefs_instance *instance,
enum tracefs_option_id id, bool set)
{
- char *set_str = set ? "1" : "0";
+ const char *set_str = set ? "1" : "0";
char file[PATH_MAX];
const char *name;
@@ -846,7 +846,7 @@ bool tracefs_option_is_enabled(struct tracefs_instance *instance, enum tracefs_o
* Returns true if an option with given id is set in the bitmask,
* false if it is not set.
*/
-bool tracefs_option_is_set(struct tracefs_options_mask *options,
+bool tracefs_option_is_set(const struct tracefs_options_mask *options,
enum tracefs_option_id id)
{
if (id > TRACEFS_OPTION_INVALID)
--
2.27.0
|