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/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* 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.
*/
#ifndef _WIN32
#include <glog/logging.h>
#include <hicn/transport/errors/runtime_exception.h>
#include <hicn/transport/utils/daemonizator.h>
#include <sys/stat.h>
#include <unistd.h>
namespace utils {
void Daemonizator::daemonize(bool close_fds) {
pid_t process_id = 0;
pid_t sid = 0;
// Create child process
process_id = fork();
// Indication of fork() failure
if (process_id < 0) {
throw errors::RuntimeException("Fork failed.");
}
// PARENT PROCESS. Need to kill it.
if (process_id > 0) {
LOG(ERROR) << "Process id of child process " << process_id;
// return success in exit status
exit(EXIT_SUCCESS);
}
// unmask the file mode
umask(0);
// set new session
sid = setsid();
if (sid < 0) {
// Return failure
exit(EXIT_FAILURE);
}
// Change the current working directory to root.
int ret = chdir("/");
if (ret < 0) {
throw errors::RuntimeException("Error changing working directory to root");
}
// Close stdin. Redirect stdout and stderr to file if possible
if (close_fds) {
close(STDOUT_FILENO);
close(STDERR_FILENO);
}
close(STDIN_FILENO);
// Really start application
}
} // namespace utils
#endif
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