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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 "ForkedBroker.h"
#include "qpid/log/Statement.h"
#include <boost/bind.hpp>
#include <boost/algorithm/string.hpp>
#include <algorithm>
#include <stdlib.h>
#include <sys/types.h>
#include <signal.h>
using namespace std;
using qpid::ErrnoException;
ForkedBroker::ForkedBroker(const Args& constArgs) {
Args args(constArgs);
Args::iterator i = find(args.begin(), args.end(), string("TMP_DATA_DIR"));
if (i != args.end()) {
args.erase(i);
char dd[] = "/tmp/ForkedBroker.XXXXXX";
if (!mkdtemp(dd))
throw qpid::ErrnoException("Can't create data dir");
dataDir = dd;
args.push_back("--data-dir");
args.push_back(dataDir);
}
init(args);
}
ForkedBroker::~ForkedBroker() {
try { kill(); }
catch (const std::exception& e) {
QPID_LOG(error, QPID_MSG("Killing forked broker: " << e.what()));
}
if (!dataDir.empty())
::system(("rm -rf "+dataDir).c_str());
}
void ForkedBroker::kill(int sig) {
if (pid == 0) return;
int savePid = pid;
pid = 0; // Reset pid here in case of an exception.
using qpid::ErrnoException;
if (::kill(savePid, sig) < 0)
throw ErrnoException("kill failed");
int status;
if (::waitpid(savePid, &status, 0) < 0 && sig != 9)
throw ErrnoException("wait for forked process failed");
if (WEXITSTATUS(status) != 0 && sig != 9)
throw qpid::Exception(QPID_MSG("Forked broker exited with: " << WEXITSTATUS(status)));
}
namespace std {
static ostream& operator<<(ostream& o, const ForkedBroker::Args& a) {
copy(a.begin(), a.end(), ostream_iterator<string>(o, " "));
return o;
}
bool isLogOption(const std::string& s) {
return boost::starts_with(s, "--log-enable") || boost::starts_with(s, "--trace");
}
}
void ForkedBroker::init(const Args& userArgs) {
using qpid::ErrnoException;
port = 0;
int pipeFds[2];
if(::pipe(pipeFds) < 0) throw ErrnoException("Can't create pipe");
pid = ::fork();
if (pid < 0) throw ErrnoException("Fork failed");
if (pid) { // parent
::close(pipeFds[1]);
FILE* f = ::fdopen(pipeFds[0], "r");
if (!f) throw ErrnoException("fopen failed");
if (::fscanf(f, "%d", &port) != 1) {
if (ferror(f)) throw ErrnoException("Error reading port number from child.");
else throw qpid::Exception("EOF reading port number from child.");
}
::close(pipeFds[0]);
}
else { // child
::close(pipeFds[0]);
int fd = ::dup2(pipeFds[1], 1); // pipe stdout to the parent.
if (fd < 0) throw ErrnoException("dup2 failed");
const char* prog = ::getenv("QPID_FORKED_BROKER");
if (!prog) prog = "../qpidd";
Args args(userArgs);
args.push_back("--port=0");
// Keep quiet except for errors.
if (!::getenv("QPID_TRACE") && !::getenv("QPID_LOG_ENABLE")
&& find_if(userArgs.begin(), userArgs.end(), isLogOption) == userArgs.end())
args.push_back("--log-enable=error+");
std::vector<const char*> argv(args.size());
std::transform(args.begin(), args.end(), argv.begin(), boost::bind(&std::string::c_str, _1));
argv.push_back(0);
QPID_LOG(debug, "ForkedBroker exec " << prog << ": " << args);
execv(prog, const_cast<char* const*>(&argv[0]));
throw ErrnoException("execv failed");
}
}
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