markers-userspace/marker-lib.c

   1
   2 #include "marker.h"
   3 #include <stdio.h>
   4
   5 extern struct marker __start___markers[];
   6 extern struct marker __stop___markers[];
   7
   8 /**
   9  * __mark_empty_function - Empty probe callback
  10  * @probe_private: probe private data
  11  * @call_private: call site private data
  12  * @fmt: format string
  13  * @...: variable argument list
  14  *
  15  * Empty callback provided as a probe to the markers. By providing this to a
  16  * disabled marker, we make sure the  execution flow is always valid even
  17  * though the function pointer change and the marker enabling are two distinct
  18  * operations that modifies the execution flow of preemptible code.
  19  */
  20 void __mark_empty_function(void *probe_private, void *call_private,
  21         const char *fmt, va_list *args)
  22 {
  23 }
  24
  25 /*
  26  * marker_probe_cb Callback that prepares the variable argument list for probes.
  27  * @mdata: pointer of type struct marker
  28  * @call_private: caller site private data
  29  * @fmt: format string
  30  * @...:  Variable argument list.
  31  *
  32  */
  33 void marker_probe_cb(const struct marker *mdata, void *call_private,
  34         const char *fmt, ...)
  35 {
  36
  37
  38 }
  39
  40 __attribute__((constructor)) void marker_init(void)
  41 {
  42         struct marker *iter;
  43
  44         printf("Marker section : from %p to %p\n",
  45                 __start___markers, __stop___markers);
  46         for (iter = __start___markers; iter < __stop___markers; iter++) {
  47                 printf("Marker : %s\n", iter->name);
  48         }
  49 }