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//
// Copyright (C) 2012 The Android Open Source Project
//
// 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.
//
#include "shill/process_killer.h"
#include <errno.h>
#include <sys/wait.h>
using base::Closure;
using std::map;
namespace shill {
namespace {
base::LazyInstance<ProcessKiller> g_process_killer = LAZY_INSTANCE_INITIALIZER;
} // namespace
ProcessKiller::ProcessKiller() {}
ProcessKiller::~ProcessKiller() {
// There's no need to release any GLib child watch sources because this class
// is a singleton and will be destroyed when this process exits, i.e., when
// GLib is shut down.
}
// static
ProcessKiller* ProcessKiller::GetInstance() {
return g_process_killer.Pointer();
}
bool ProcessKiller::Wait(int pid, const Closure& callback) {
LOG(INFO) << "Waiting for pid " << pid;
if (!callback.is_null()) {
callbacks_[pid] = callback;
}
// Check if the child process is dead already. This guards against the case
// when the caller had registered a child watch on that process but the
// process exited before the caller removed the watch and invoked this.
int status = 0;
pid_t rpid = waitpid(pid, &status, WNOHANG);
if (rpid == -1) {
DCHECK_EQ(ECHILD, errno);
LOG(INFO) << "No such child -- assuming process has already exited.";
OnProcessDied(pid, 0, this);
return false;
}
if (rpid == pid) {
LOG(INFO) << "Process has already exited.";
OnProcessDied(pid, status, this);
return false;
}
g_child_watch_add(pid, OnProcessDied, this);
return true;
}
void ProcessKiller::Kill(int pid, const Closure& callback) {
if (!Wait(pid, callback)) {
LOG(INFO) << "Process already dead, no need to kill.";
return;
}
LOG(INFO) << "Killing pid " << pid;
// TODO(petkov): Consider sending subsequent periodic signals and raising the
// signal to SIGKILL if the process keeps running.
if (kill(pid, SIGTERM) == -1) {
PLOG(ERROR) << "SIGTERM failed";
}
}
// static
void ProcessKiller::OnProcessDied(GPid pid, gint status, gpointer data) {
LOG(INFO) << "pid " << pid << " died, status " << status;
ProcessKiller* me = reinterpret_cast<ProcessKiller*>(data);
map<int, Closure>::iterator callback_it = me->callbacks_.find(pid);
if (callback_it == me->callbacks_.end()) {
return;
}
const Closure& callback = callback_it->second;
if (!callback.is_null()) {
LOG(INFO) << "Running callback for dead pid " << pid;
callback.Run();
}
me->callbacks_.erase(callback_it);
}
} // namespace shill
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