src/test/test-helper.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include "test-helper.h"
   4 #include "random-util.h"
   5 #include "alloc-util.h"
   6 #include "cgroup-util.h"
   7
   8 int enter_cgroup_subroot(void) {
   9         _cleanup_free_ char *cgroup_root = NULL, *cgroup_subroot = NULL;
  10         CGroupMask supported;
  11         int r;
  12
  13         r = cg_pid_get_path(NULL, 0, &cgroup_root);
  14         if (r == -ENOMEDIUM)
  15                 return log_warning_errno(r, "cg_pid_get_path(NULL, 0, ...) failed: %m");
  16         assert(r >= 0);
  17
  18         assert_se(asprintf(&cgroup_subroot, "%s/%" PRIx64, cgroup_root, random_u64()) >= 0);
  19         assert_se(cg_mask_supported(&supported) >= 0);
  20
  21         /* If this fails, then we don't mind as the later cgroup operations will fail too, and it's fine if we handle
  22          * any errors at that point. */
  23
  24         r = cg_create_everywhere(supported, _CGROUP_MASK_ALL, cgroup_subroot);
  25         if (r < 0)
  26                 return r;
  27
  28         return cg_attach_everywhere(supported, cgroup_subroot, 0, NULL, NULL);
  29 }