WIP

clock-res/src/tracer.c

@@ -38,6 +38,7 @@
 
 static char *fileprefix;
 static char *procfileprefix = "/proc/sys/kernel/";
+static char *debugfileprefix = "/sys/kernel/debug/tracing/";
 static int trace_fd = -1;
 
 static int kernvar(int mode, const char *name, char *value,
@@ -47,11 +48,6 @@ static int kernvar(int mode, const char *name, char *value,
   int path;
   size_t len_prefix = strlen(fileprefix), len_name = strlen(name);
 
-  if (len_prefix + len_name + 1 > sizeof(filename)) {
-    errno = ENOMEM;
-    return 1;
-  }
-
   memcpy(filename, fileprefix, len_prefix);
   memcpy(filename + len_prefix, name, len_name + 1);
 
@@ -97,6 +93,7 @@ void setup_tracer(void) {
   fileprefix = procfileprefix;
   setkernvar("ftrace_enabled", "1");
 
+  fileprefix = debugfileprefix;
   // Clear old traces by setting tracer to nop first
   settracer("nop");
   settracer("function");