tools/perf/perf-read-vdso.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <stdio.h>
   3 #include <string.h>
   4
   5 #define VDSO__MAP_NAME "[vdso]"
   6
   7 /*
   8  * Include definition of find_map() also used in util/vdso.c for
   9  * building perf.
  10  */
  11 #include "util/find-map.c"
  12
  13 int main(void)
  14 {
  15         void *start, *end;
  16         size_t size, written;
  17
  18         if (find_map(&start, &end, VDSO__MAP_NAME))
  19                 return 1;
  20
  21         size = end - start;
  22
  23         while (size) {
  24                 written = fwrite(start, 1, size, stdout);
  25                 if (!written)
  26                         return 1;
  27                 start += written;
  28                 size -= written;
  29         }
  30
  31         if (fflush(stdout))
  32                 return 1;
  33
  34         return 0;
  35 }