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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_SUBPROCESS_H__
#define CHROMEOS_PLATFORM_UPDATE_ENGINE_SUBPROCESS_H__
#include <map>
#include <string>
#include <vector>
#include <glib.h>
#include "chromeos/obsolete_logging.h"
#include "base/basictypes.h"
// The Subprocess class is a singleton. It's used to spawn off a subprocess
// and get notified when the subprocess exits. The result of Exec() can
// be saved and used to cancel the callback request. If you know you won't
// call CancelExec(), you may safely lose the return value from Exec().
namespace chromeos_update_engine {
class Subprocess {
public:
static void Init() {
CHECK(!subprocess_singleton_);
subprocess_singleton_ = new Subprocess;
}
typedef void(*ExecCallback)(int return_code, void *p);
// Returns a tag > 0 on success.
uint32 Exec(const std::vector<std::string>& cmd,
ExecCallback callback,
void* p);
// Used to cancel the callback. The process will still run to completion.
void CancelExec(uint32 tag);
// Executes a command synchronously. Returns true on success.
static bool SynchronousExec(const std::vector<std::string>& cmd,
int* return_code);
// Gets the one instance
static Subprocess& Get() {
return *subprocess_singleton_;
}
// Returns true iff there is at least one subprocess we're waiting on.
bool SubprocessInFlight() {
for (std::map<int, SubprocessCallbackRecord>::iterator it =
callback_records_.begin();
it != callback_records_.end(); ++it) {
if (it->second.callback)
return true;
}
return false;
}
private:
// The global instance
static Subprocess* subprocess_singleton_;
// Callback for when any subprocess terminates. This calls the user
// requested callback.
static void GChildExitedCallback(GPid pid, gint status, gpointer data);
struct SubprocessCallbackRecord {
ExecCallback callback;
void* callback_data;
};
std::map<int, SubprocessCallbackRecord> callback_records_;
Subprocess() {}
DISALLOW_COPY_AND_ASSIGN(Subprocess);
};
} // namespace chromeos_update_engine
#endif // CHROMEOS_PLATFORM_UPDATE_ENGINE_SUBPROCESS_H__
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