trunk/tests/markers/probe.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 /* function to install */
  16 #define DO_MARK1_FORMAT "%d %p"
  17 void do_mark1(const char *format, ...)
  18 {
  19 #if 0
  20         va_list ap;
  21         int value;
  22
  23         va_start(ap, format);
  24         value = va_arg(ap, int);
  25         printk("value is %d\n", value);
  26
  27         va_end(ap);
  28 #endif //0
  29 }
  30
  31 int init_module(void)
  32 {
  33         int result;
  34         result = marker_set_probe("subsys_mark1", DO_MARK1_FORMAT,
  35                         (marker_probe_func*)do_mark1);
  36         if(!result) goto end;
  37
  38         return 0;
  39
  40 end:
  41         marker_remove_probe(do_mark1);
  42         return -EPERM;
  43 }
  44
  45 void cleanup_module(void)
  46 {
  47         marker_remove_probe(do_mark1);
  48 }
  49
  50 MODULE_LICENSE("GPL");
  51 MODULE_AUTHOR("Mathieu Desnoyers");
  52 MODULE_DESCRIPTION("Probe");