d89ed132a0
~2007 a change was added that would allow oneshot services to daemonize by not killing their process group. This was a hack at the time, and should certainly not be needed now. I've resisted removing the behavior however, as it hadn't caused any issues. Recently, it was detected that the cgroups that these processes belong to, would exist forever and therefore leak memory. Instead of simply removing the cgroups when empty, this provides a good opportunity to do the right thing and fix this behavior once and for all. The new (correct) behavior only happens for devices with vendor images built for Android R or later. Init will log a warning to dmesg when it detects this difference in behavior has occurred. Bug: 144545923 Test: boot CF/Coral and see no difference in behavior. Test: boot CF with a service that daemonizes and see the warning. Change-Id: I333a2e25a541ec0114ac50ab8ae7f1ea3f055447
71 lines
3 KiB
C++
71 lines
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 <string>
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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 CgroupGetControllerPath(const std::string& cgroup_name, std::string* path);
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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 use_fd_cache = false);
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#ifndef __ANDROID_VNDK__
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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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// If max_processes is not nullptr, it returns the maximum number of processes seen in the cgroup
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// during the killing process. Note that this can be 0 if all processes from the process group have
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// already been terminated.
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int killProcessGroup(uid_t uid, int initialPid, int signal, int* max_processes = nullptr);
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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, int* max_processes = nullptr);
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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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#endif // __ANDROID_VNDK__
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__END_DECLS
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