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libprocessgroup: Add sendSignalToProcessGroup

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Add a function which sends signals to all members of a process group,
but does not wait for the processes to exit, or for the associated
cgroup to be removed.

Bug: 274646058
Ignore-AOSP-First: Dependency of ActivityManager change which developed on interal git_master
Test: Force-stop of chrome with 15 tabs completes ~500ms faster
Test: Full Play store update causes no ANR
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:d87b6018d25cbbd33b345dc58c634718bf5d0def)
Merged-In: I37dbdecb3394101abbee8495e71f6912b3c031f5
Change-Id: I37dbdecb3394101abbee8495e71f6912b3c031f5
This commit is contained in:
T.J. Mercier 2023-04-04 18:41:13 +00:00 committed by Cherrypicker Worker
parent c7e85ebc00
commit d3dc653d22
2 changed files with 14 additions and 0 deletions
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5
libprocessgroup/include/processgroup/processgroup.h
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@ -76,6 +76,11 @@ int killProcessGroup(uid_t uid, int initialPid, int signal, int* max_processes =
// that it only returns 0 in the case that the cgroup exists and it contains no processes.
int killProcessGroupOnce(uid_t uid, int initialPid, int signal, int* max_processes = nullptr);
// Sends the provided signal to all members of a process group, but does not wait for processes to
// exit, or for the cgroup to be removed. Callers should also ensure that killProcessGroup is called
// later to ensure the cgroup is fully removed, otherwise system resources may leak.
int sendSignalToProcessGroup(uid_t uid, int initialPid, int signal);
int createProcessGroup(uid_t uid, int initialPid, bool memControl = false);
// Set various properties of a process group. For these functions to work, the process group must

9
libprocessgroup/processgroup.cpp
View file

@ -542,6 +542,15 @@ int killProcessGroupOnce(uid_t uid, int initialPid, int signal, int* max_process
return KillProcessGroup(uid, initialPid, signal, 0 /*retries*/, max_processes);
}
int sendSignalToProcessGroup(uid_t uid, int initialPid, int signal) {
std::string hierarchy_root_path;
if (CgroupsAvailable()) {
CgroupGetControllerPath(CGROUPV2_CONTROLLER_NAME, &hierarchy_root_path);
}
const char* cgroup = hierarchy_root_path.c_str();
return DoKillProcessGroupOnce(cgroup, uid, initialPid, signal);
}
static int createProcessGroupInternal(uid_t uid, int initialPid, std::string cgroup,
bool activate_controllers) {
auto uid_path = ConvertUidToPath(cgroup.c_str(), uid);