+}
+
+/* verify cap_last_cap() against /proc/sys/kernel/cap_last_cap */
+static void test_last_cap_file(void) {
+ _cleanup_free_ char *content = NULL;
+ unsigned long val = 0;
+ int r;
+
+ r = read_one_line_file("/proc/sys/kernel/cap_last_cap", &content);
+ assert_se(r >= 0);
+
+ r = safe_atolu(content, &val);
+ assert_se(r >= 0);
+ assert_se(val != 0);
+ assert_se(val == cap_last_cap());
+}
+
+/* verify cap_last_cap() against syscall probing */
+static void test_last_cap_probe(void) {
+ unsigned long p = (unsigned long)CAP_LAST_CAP;
+
+ if (prctl(PR_CAPBSET_READ, p) < 0) {
+ for (p--; p > 0; p --)
+ if (prctl(PR_CAPBSET_READ, p) >= 0)
+ break;
+ } else {
+ for (;; p++)
+ if (prctl(PR_CAPBSET_READ, p+1) < 0)
+ break;
+ }
+
+ assert_se(p != 0);
+ assert_se(p == cap_last_cap());
+}
+
+int main(int argc, char *argv[]) {
+ test_cap_list();
+ test_last_cap_file();
+ test_last_cap_probe();