53e1b68390
This follows what the kernel is doing, c.f. https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5fd54ace4721fc5ce2bb5aef6318fcf17f421460.
48 lines
1.7 KiB
C
48 lines
1.7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2017 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "test-helper.h"
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#include "random-util.h"
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#include "alloc-util.h"
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#include "cgroup-util.h"
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int enter_cgroup_subroot(void) {
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_cleanup_free_ char *cgroup_root = NULL, *cgroup_subroot = NULL;
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CGroupMask supported;
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int r;
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r = cg_pid_get_path(NULL, 0, &cgroup_root);
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if (r == -ENOMEDIUM)
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return log_warning_errno(r, "cg_pid_get_path(NULL, 0, ...) failed: %m");
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assert(r >= 0);
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assert_se(asprintf(&cgroup_subroot, "%s/%" PRIx64, cgroup_root, random_u64()) >= 0);
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assert_se(cg_mask_supported(&supported) >= 0);
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/* If this fails, then we don't mind as the later cgroup operations will fail too, and it's fine if we handle
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* any errors at that point. */
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r = cg_create_everywhere(supported, _CGROUP_MASK_ALL, cgroup_subroot);
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if (r < 0)
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return r;
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return cg_attach_everywhere(supported, cgroup_subroot, 0, NULL, NULL);
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}
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