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81 lines
1.9 KiB
C++
81 lines
1.9 KiB
C++
/*
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Copyright (C) 2022 The Falco Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "application.h"
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using namespace falco::app;
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static bool s_daemonized = false;
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application::run_result application::daemonize()
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{
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// If daemonizing, do it here so any init errors will
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// be returned in the foreground process.
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if (m_options.daemon && !s_daemonized) {
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pid_t pid, sid;
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pid = fork();
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if (pid < 0) {
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// error
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return run_result::fatal("Could not fork");
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} else if (pid > 0) {
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// parent. Write child pid to pidfile and exit
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std::ofstream pidfile;
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pidfile.open(m_options.pidfilename);
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if (!pidfile.good())
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{
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falco_logger::log(LOG_ERR, "Could not write pid to pid file " + m_options.pidfilename + ". Exiting.\n");
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exit(-1);
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}
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pidfile << pid;
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pidfile.close();
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exit(0);
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}
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// if here, child.
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// Become own process group.
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sid = setsid();
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if (sid < 0) {
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return run_result::fatal("Could not set session id");
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}
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// Set umask so no files are world anything or group writable.
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umask(027);
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// Change working directory to '/'
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if ((chdir("/")) < 0) {
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return run_result::fatal("Could not change working directory to '/'");
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}
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// Close stdin, stdout, stderr and reopen to /dev/null
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close(0);
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close(1);
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close(2);
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open("/dev/null", O_RDONLY);
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open("/dev/null", O_RDWR);
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open("/dev/null", O_RDWR);
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s_daemonized = true;
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}
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return run_result::ok();
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}
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