summaryrefslogtreecommitdiffstats
path: root/kernel/tools/perf/util/find-vdso-map.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/tools/perf/util/find-vdso-map.c')
-rw-r--r--kernel/tools/perf/util/find-vdso-map.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/kernel/tools/perf/util/find-vdso-map.c b/kernel/tools/perf/util/find-vdso-map.c
new file mode 100644
index 000000000..95ef1cffc
--- /dev/null
+++ b/kernel/tools/perf/util/find-vdso-map.c
@@ -0,0 +1,30 @@
+static int find_vdso_map(void **start, void **end)
+{
+ FILE *maps;
+ char line[128];
+ int found = 0;
+
+ maps = fopen("/proc/self/maps", "r");
+ if (!maps) {
+ fprintf(stderr, "vdso: cannot open maps\n");
+ return -1;
+ }
+
+ while (!found && fgets(line, sizeof(line), maps)) {
+ int m = -1;
+
+ /* We care only about private r-x mappings. */
+ if (2 != sscanf(line, "%p-%p r-xp %*x %*x:%*x %*u %n",
+ start, end, &m))
+ continue;
+ if (m < 0)
+ continue;
+
+ if (!strncmp(&line[m], VDSO__MAP_NAME,
+ sizeof(VDSO__MAP_NAME) - 1))
+ found = 1;
+ }
+
+ fclose(maps);
+ return !found;
+}