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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 "QpidError.h"
#include "Daemon.h"
#include <libdaemon/daemon.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include <signal.h>
#include <boost/filesystem/path.hpp>
#include <boost/filesystem/operations.hpp>
namespace qpid {
namespace broker {
using namespace std;
string Daemon::pidFile;
string Daemon::name;
string Daemon::nameFromArgv0(const char* argv0) {
return string(daemon_ident_from_argv0(const_cast<char*>(argv0)));
}
const char* Daemon::getPidFile() {
if (pidFile.empty()) {
const char* home=getenv("HOME");
if (!home)
throw(Exception("$HOME is not set, cant create $HOME/.qpidd."));
using namespace boost::filesystem;
path dir = path(home,native) / path(".qpidd", native);
create_directory(dir);
dir /= name;
pidFile = dir.string();
}
return pidFile.c_str();
}
Daemon::Daemon(const string& name_, int secs) : timeout(secs)
{
name = name_;
daemon_pid_file_ident = daemon_log_ident = name.c_str();
if (getuid() != 0) {
// For normal users put pid file under $HOME/.qpid
daemon_pid_file_proc = getPidFile;
}
// For root use the libdaemon default: /var/run.
}
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() {
retval.reset(new Retval());
pid = daemon_fork();
if (pid < 0)
throw Exception("Failed to fork daemon: "+strError(errno));
else if (pid > 0) {
int ret = retval->wait(timeout); // parent, wait for child.
if (ret != 0) {
string err;
if (ret > 0)
err = strError(ret);
else if (ret == -1)
err= strError(errno);
else
err= "unknown error";
throw Exception("Deamon startup failed: "+err);
}
}
else if (pid == 0) { // child.
// TODO aconway 2007-04-26: Should log failures.
if (daemon_pid_file_create())
failed();
}
return pid;
}
void Daemon::notify(int i) {
assert(retval);
if (retval->send(i))
throw Exception("Failed to notify parent: "+strError(errno));
}
void Daemon::ready() { notify(0); }
// NB: Not -1, confused with failure of fork() on the parent side.
void Daemon::failed() { notify(errno? errno:-2); }
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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