599d979126
The max_processes calculation is incorrect for KillProcessGroup because the set of processes in cgroup.procs can differ between the multiple reads in the implementation. Luckily the exact value isn't very important because it's just logged. Remove max_processes from the API and remove the warning about the new behavior in Android 11. Note that we still always LOG(INFO) that any cgroup is being killed. Bug: 301871933 Change-Id: I8e449f5089d4a48dbc1797b6d979539e87026f43
102 lines
4.3 KiB
C++
102 lines
4.3 KiB
C++
/*
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* Copyright 2014 Google, Inc
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <initializer_list>
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#include <span>
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#include <string>
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#include <string_view>
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#include <vector>
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__BEGIN_DECLS
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static constexpr const char* CGROUPV2_CONTROLLER_NAME = "cgroup2";
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bool CgroupsAvailable();
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bool CgroupGetControllerPath(const std::string& cgroup_name, std::string* path);
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bool CgroupGetControllerFromPath(const std::string& path, std::string* cgroup_name);
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bool CgroupGetAttributePath(const std::string& attr_name, std::string* path);
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bool CgroupGetAttributePathForTask(const std::string& attr_name, int tid, std::string* path);
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bool SetTaskProfiles(int tid, const std::vector<std::string>& profiles, bool use_fd_cache = false);
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bool SetProcessProfiles(uid_t uid, pid_t pid, const std::vector<std::string>& profiles);
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bool SetUserProfiles(uid_t uid, const std::vector<std::string>& profiles);
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__END_DECLS
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bool SetTaskProfiles(int tid, std::initializer_list<std::string_view> profiles,
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bool use_fd_cache = false);
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bool SetProcessProfiles(uid_t uid, pid_t pid, std::initializer_list<std::string_view> profiles);
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#if _LIBCPP_STD_VER > 17
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bool SetTaskProfiles(int tid, std::span<const std::string_view> profiles,
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bool use_fd_cache = false);
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bool SetProcessProfiles(uid_t uid, pid_t pid, std::span<const std::string_view> profiles);
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#endif
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__BEGIN_DECLS
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#ifndef __ANDROID_VNDK__
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bool SetProcessProfilesCached(uid_t uid, pid_t pid, const std::vector<std::string>& profiles);
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static constexpr const char* CGROUPS_RC_PATH = "/dev/cgroup_info/cgroup.rc";
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bool UsePerAppMemcg();
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// Drop the fd cache of cgroup path. It is used for when resource caching is enabled and a process
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// loses the access to the path, the access checking (See SetCgroupAction::EnableResourceCaching)
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// should be active again. E.g. Zygote specialization for child process.
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void DropTaskProfilesResourceCaching();
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// Return 0 and removes the cgroup if there are no longer any processes in it.
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// Returns -1 in the case of an error occurring or if there are processes still running
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// even after retrying for up to 200ms.
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int killProcessGroup(uid_t uid, int initialPid, int signal);
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// Returns the same as killProcessGroup(), however it does not retry, which means
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// that it only returns 0 in the case that the cgroup exists and it contains no processes.
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int killProcessGroupOnce(uid_t uid, int initialPid, int signal);
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// Sends the provided signal to all members of a process group, but does not wait for processes to
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// exit, or for the cgroup to be removed. Callers should also ensure that killProcessGroup is called
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// later to ensure the cgroup is fully removed, otherwise system resources may leak.
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int sendSignalToProcessGroup(uid_t uid, int initialPid, int signal);
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int createProcessGroup(uid_t uid, int initialPid, bool memControl = false);
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// Set various properties of a process group. For these functions to work, the process group must
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// have been created by passing memControl=true to createProcessGroup.
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bool setProcessGroupSwappiness(uid_t uid, int initialPid, int swappiness);
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bool setProcessGroupSoftLimit(uid_t uid, int initialPid, int64_t softLimitInBytes);
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bool setProcessGroupLimit(uid_t uid, int initialPid, int64_t limitInBytes);
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void removeAllProcessGroups(void);
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void removeAllEmptyProcessGroups(void);
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// Provides the path for an attribute in a specific process group
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// Returns false in case of error, true in case of success
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bool getAttributePathForTask(const std::string& attr_name, int tid, std::string* path);
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// Check if a profile can be applied without failing.
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// Returns true if it can be applied without failing, false otherwise
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bool isProfileValidForProcess(const std::string& profile_name, int uid, int pid);
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#endif // __ANDROID_VNDK__
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__END_DECLS
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