trunk/tests/markers/probe-vararg.c

   1 /* probe.c
   2  *
   3  * Loads a function at a marker call site.
   4  *
   5  * (C) Copyright 2006 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
   6  *
   7  * This file is released under the GPLv2.
   8  * See the file COPYING for more details.
   9  */
  10
  11 #include <linux/marker.h>
  12 #include <linux/module.h>
  13 #include <linux/kallsyms.h>
  14
  15
  16 int value;
  17 void *ptr;
  18
  19 /* function to install */
  20 #define DO_MARK1_FORMAT "%d %p"
  21 void do_mark1(const char *format, ...)
  22 {
  23         va_list ap;
  24
  25         va_start(ap, format);
  26         value = va_arg(ap, int);
  27         ptr = va_arg(ap, void*);
  28
  29         va_end(ap);
  30 }
  31
  32 int init_module(void)
  33 {
  34         int result;
  35         result = marker_set_probe("subsys_mark1", DO_MARK1_FORMAT,
  36                         (marker_probe_func*)do_mark1);
  37         if(!result) goto end;
  38
  39         return 0;
  40
  41 end:
  42         marker_remove_probe(do_mark1);
  43         return -EPERM;
  44 }
  45
  46 void cleanup_module(void)
  47 {
  48         marker_remove_probe(do_mark1);
  49 }
  50
  51 MODULE_LICENSE("GPL");
  52 MODULE_AUTHOR("Mathieu Desnoyers");
  53 MODULE_DESCRIPTION("Probe");