LXR linux/tools/perf/util/find-vdso-map.c

   1static int find_vdso_map(void **start, void **end)
   2{
   3        FILE *maps;
   4        char line[128];
   5        int found = 0;
   6
   7        maps = fopen("/proc/self/maps", "r");
   8        if (!maps) {
   9                fprintf(stderr, "vdso: cannot open maps\n");
  10                return -1;
  11        }
  12
  13        while (!found && fgets(line, sizeof(line), maps)) {
  14                int m = -1;
  15
  16                /* We care only about private r-x mappings. */
  17                if (2 != sscanf(line, "%p-%p r-xp %*x %*x:%*x %*u %n",
  18                                start, end, &m))
  19                        continue;
  20                if (m < 0)
  21                        continue;
  22
  23                if (!strncmp(&line[m], VDSO__MAP_NAME,
  24                             sizeof(VDSO__MAP_NAME) - 1))
  25                        found = 1;
  26        }
  27
  28        fclose(maps);
  29        return !found;
  30}
  31