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/*
*
* Copyright (c) 2006 The Apache Software Foundation
*
* 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 "Daemon.h"
#include "qpid/log/Statement.h"
#include "qpid/QpidError.h"
#include <libdaemon/daemon.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include <signal.h>
namespace qpid {
namespace broker {
using namespace std;
boost::function<std::string()> qpid::broker::Daemon::pidFileFn;
std::string Daemon::defaultPidFile(const std::string& identifier) {
daemon_pid_file_ident=identifier.c_str();
return daemon_pid_file_proc_default();
}
const char* Daemon::realPidFileFn() {
static std::string str = pidFileFn();
return str.c_str();
}
Daemon::Daemon(boost::function<std::string()> fn, int secs) : pid(-1), timeout(secs)
{
pidFileFn = fn;
daemon_pid_file_proc = &realPidFileFn;
}
Daemon::~Daemon() {
if (isChild())
daemon_pid_file_remove();
}
class Daemon::Retval {
public:
Retval();
~Retval();
int send(int s);
int wait(int timeout);
private:
bool completed;
};
pid_t Daemon::fork(Function parent, Function child) {
retval.reset(new Retval());
pid = daemon_fork();
if (pid < 0)
throw Exception("Failed to fork daemon: "+strError(errno));
else if (pid == 0) {
try {
child(*this);
} catch (const exception& e) {
QPID_LOG(debug, "Rethrowing: " << e.what());
failed(); // Notify parent
throw;
}
}
else
parent(*this);
return pid;
}
int Daemon::wait() { // parent
assert(retval);
errno = 0; // Clear errno.
int ret = retval->wait(timeout); // wait for child.
if (ret == -1) {
if (errno)
throw Exception("Error waiting for daemon startup:"
+strError(errno));
else
throw Exception("Error waiting for daemon startup, check logs.");
}
return ret;
}
void Daemon::notify(int value) { // child
assert(retval);
if (retval->send(value))
throw Exception("Failed to notify parent: "+strError(errno));
}
void Daemon::ready(int value) { // child
if (value==-1)
throw Exception("Invalid value in Dameon::notify");
errno = 0;
if (daemon_pid_file_create() != 0)
throw Exception(string("Failed to create PID file ") +
daemon_pid_file_proc()+": "+strError(errno));
notify(value);
}
void Daemon::failed() { notify(-1); }
void Daemon::quit() {
if (daemon_pid_file_kill_wait(SIGINT, timeout))
throw Exception("Failed to stop daemon: " + strError(errno));
}
void Daemon::kill() {
if (daemon_pid_file_kill_wait(SIGKILL, timeout) < 0)
throw Exception("Failed to stop daemon: " + strError(errno));
}
pid_t Daemon::check() {
return daemon_pid_file_is_running();
}
Daemon::Retval::Retval() : completed(false) {
daemon_retval_init();
}
Daemon::Retval::~Retval() {
if (!completed) daemon_retval_done();
}
int Daemon::Retval::send(int s) {
return daemon_retval_send(s);
}
int Daemon::Retval::wait(int timeout) {
return daemon_retval_wait(timeout);
}
}} // namespace qpid::broker
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