A new local function is added to check if a given trace clock is
supported by the ftrace:
clock_is_supported()
This function is used by the other patches from the set.
The logic should be part of the tracefs library, when a tracefs API is
implemeneted, this local funciton will be removed.
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@xxxxxxxxx>
---
tracecmd/trace-record.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/tracecmd/trace-record.c b/tracecmd/trace-record.c
index 635897e1..c7197ba0 100644
--- a/tracecmd/trace-record.c
+++ b/tracecmd/trace-record.c
@@ -5683,6 +5683,34 @@ check_instance_die(struct buffer_instance *instance, char *param)
tracefs_instance_get_name(instance->tracefs), param);
}
+static bool clock_is_supported(struct tracefs_instance *instance, const char *clock)
+{
+ char *all_clocks = NULL;
+ char *ret = NULL;
+
+ all_clocks = tracefs_instance_file_read(instance, "trace_clock", NULL);
+ if (!all_clocks)
+ return false;
+
+ ret = strstr(all_clocks, clock);
+ if (ret && (ret == all_clocks || ret[-1] == ' ' || ret[-1] == '[')) {
+ switch (ret[strlen(clock)]) {
+ case ' ':
+ case '\0':
+ case ']':
+ case '\n':
+ break;
+ default:
+ ret = NULL;
+ }
+ } else {
+ ret = NULL;
+ }
+ free(all_clocks);
+
+ return ret != NULL;
+}
+
static void parse_record_options(int argc,
char **argv,
enum trace_cmd curr_cmd,
--
2.30.2
|