hello/hello.c

   1 #include <stdio.h>
   2 #include <unistd.h>
   3 #include <sys/mman.h>
   4
   5 #include "../libmarkers/marker.h"
   6
   7 void probe(const struct marker *mdata,
   8                 void *probe_private, void *call_private,
   9                 const char *fmt, va_list *args)
  10 {
  11         printf("In probe\n");
  12 }
  13
  14 void try_map()
  15 {
  16         char *m;
  17
  18         /* maybe add MAP_LOCKED */
  19         m = mmap(NULL, 4096, PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_POPULATE , -1, 0);
  20         if(m == (char*)-1) {
  21                 perror("mmap");
  22                 return;
  23         }
  24
  25         printf("The mapping is at %p.\n", m);
  26         strcpy(m, "Hello, Mapping!");
  27 }
  28
  29 int main()
  30 {
  31         //ltt_trace_create();
  32
  33         try_map();
  34
  35         printf("Hello, World!\n");
  36
  37         marker_probe_register("abc", "testmark", "", probe, NULL);
  38
  39         trace_mark(abc, testmark, "", MARK_NOARGS);
  40
  41         scanf("%*s");
  42
  43         return 0;
  44 }