src/test/test-helper.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright 2017 Lennart Poettering
   4 ***/
   5
   6 #include "test-helper.h"
   7 #include "random-util.h"
   8 #include "alloc-util.h"
   9 #include "cgroup-util.h"
  10
  11 int enter_cgroup_subroot(void) {
  12         _cleanup_free_ char *cgroup_root = NULL, *cgroup_subroot = NULL;
  13         CGroupMask supported;
  14         int r;
  15
  16         r = cg_pid_get_path(NULL, 0, &cgroup_root);
  17         if (r == -ENOMEDIUM)
  18                 return log_warning_errno(r, "cg_pid_get_path(NULL, 0, ...) failed: %m");
  19         assert(r >= 0);
  20
  21         assert_se(asprintf(&cgroup_subroot, "%s/%" PRIx64, cgroup_root, random_u64()) >= 0);
  22         assert_se(cg_mask_supported(&supported) >= 0);
  23
  24         /* If this fails, then we don't mind as the later cgroup operations will fail too, and it's fine if we handle
  25          * any errors at that point. */
  26
  27         r = cg_create_everywhere(supported, _CGROUP_MASK_ALL, cgroup_subroot);
  28         if (r < 0)
  29                 return r;
  30
  31         return cg_attach_everywhere(supported, cgroup_subroot, 0, NULL, NULL);
  32 }