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-rw-r--r--test/util/cgroup_util.h121
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diff --git a/test/util/cgroup_util.h b/test/util/cgroup_util.h
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-// Copyright 2021 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef GVISOR_TEST_UTIL_CGROUP_UTIL_H_
-#define GVISOR_TEST_UTIL_CGROUP_UTIL_H_
-
-#include <unistd.h>
-
-#include "absl/container/flat_hash_map.h"
-#include "absl/container/flat_hash_set.h"
-#include "absl/strings/string_view.h"
-#include "test/util/cleanup.h"
-#include "test/util/fs_util.h"
-#include "test/util/temp_path.h"
-
-namespace gvisor {
-namespace testing {
-
-// Cgroup represents a cgroup directory on a mounted cgroupfs.
-class Cgroup {
- public:
- Cgroup(std::string_view path);
-
- uint64_t id() const { return id_; }
-
- const std::string& Path() const { return cgroup_path_; }
-
- std::string Relpath(absl::string_view leaf) const {
- return JoinPath(cgroup_path_, leaf);
- }
-
- // Returns the contents of a cgroup control file with the given name.
- PosixErrorOr<std::string> ReadControlFile(absl::string_view name) const;
-
- // Reads the contents of a cgroup control with the given name, and attempts
- // to parse it as an integer.
- PosixErrorOr<int64_t> ReadIntegerControlFile(absl::string_view name) const;
-
- // Writes a string to a cgroup control file.
- PosixError WriteControlFile(absl::string_view name,
- const std::string& value) const;
-
- // Writes an integer value to a cgroup control file.
- PosixError WriteIntegerControlFile(absl::string_view name,
- int64_t value) const;
-
- // Returns the thread ids of the leaders of thread groups managed by this
- // cgroup.
- PosixErrorOr<absl::flat_hash_set<pid_t>> Procs() const;
-
- PosixErrorOr<absl::flat_hash_set<pid_t>> Tasks() const;
-
- // ContainsCallingProcess checks whether the calling process is part of the
- PosixError ContainsCallingProcess() const;
-
- private:
- PosixErrorOr<absl::flat_hash_set<pid_t>> ParsePIDList(
- absl::string_view data) const;
-
- static int64_t next_id_;
- int64_t id_;
- const std::string cgroup_path_;
-};
-
-// Mounter is a utility for creating cgroupfs mounts. It automatically manages
-// the lifetime of created mounts.
-class Mounter {
- public:
- Mounter(TempPath root) : root_(std::move(root)) {}
-
- PosixErrorOr<Cgroup> MountCgroupfs(std::string mopts);
-
- PosixError Unmount(const Cgroup& c);
-
- private:
- // The destruction order of these members avoids errors during cleanup. We
- // first unmount (by executing the mounts_ cleanups), then delete the
- // mountpoint subdirs, then delete the root.
- TempPath root_;
- absl::flat_hash_map<int64_t, TempPath> mountpoints_;
- absl::flat_hash_map<int64_t, Cleanup> mounts_;
-};
-
-// Represents a line from /proc/cgroups.
-struct CgroupsEntry {
- std::string subsys_name;
- uint32_t hierarchy;
- uint64_t num_cgroups;
- bool enabled;
-};
-
-// Returns a parsed representation of /proc/cgroups.
-PosixErrorOr<absl::flat_hash_map<std::string, CgroupsEntry>>
-ProcCgroupsEntries();
-
-// Represents a line from /proc/<pid>/cgroup.
-struct PIDCgroupEntry {
- uint32_t hierarchy;
- std::string controllers;
- std::string path;
-};
-
-// Returns a parsed representation of /proc/<pid>/cgroup.
-PosixErrorOr<absl::flat_hash_map<std::string, PIDCgroupEntry>>
-ProcPIDCgroupEntries(pid_t pid);
-
-} // namespace testing
-} // namespace gvisor
-
-#endif // GVISOR_TEST_UTIL_CGROUP_UTIL_H_