You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
132 lines
3.0 KiB
132 lines
3.0 KiB
/*
|
|
* Copyright (c) 2022 by Geoffrey Merck F4FXL / KC3FRA
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
/*
|
|
* Losely based on https://github.com/jirihnidek/daemon/blob/master/src/daemon.c
|
|
*/
|
|
|
|
#include <unistd.h>
|
|
#include <cstdlib>
|
|
#include <csignal>
|
|
#include <sys/stat.h>
|
|
#include <cstdio>
|
|
#include <cstring>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
|
|
#include "Daemon.h"
|
|
#include "Log.h"
|
|
|
|
int CDaemon::m_pid_fd = -1;
|
|
std::string CDaemon::m_pidFileName("");
|
|
|
|
DAEMONIZE_RESULT CDaemon::daemonize(const std::string& pidFile)
|
|
{
|
|
pid_t pid = 0;
|
|
int fd;
|
|
|
|
/* Fork off the parent process */
|
|
pid = fork();
|
|
|
|
/* An error occurred */
|
|
if (pid < 0) {
|
|
return DR_FAILURE;
|
|
}
|
|
|
|
/* Success: Let the parent terminate */
|
|
if (pid > 0) {
|
|
return DR_PARENT;
|
|
}
|
|
|
|
/* On success: The child process becomes session leader */
|
|
if (setsid() < 0) {
|
|
return DR_FAILURE;
|
|
}
|
|
|
|
/* Ignore signal sent from child to parent process */
|
|
signal(SIGCHLD, SIG_IGN);
|
|
|
|
/* Fork off for the second time*/
|
|
pid = fork();
|
|
|
|
/* An error occurred */
|
|
if (pid < 0) {
|
|
return DR_FAILURE;
|
|
}
|
|
|
|
/* Success: Let the parent terminate */
|
|
if (pid > 0) {
|
|
return DR_PARENT;
|
|
}
|
|
|
|
/* Set new file permissions */
|
|
umask(0);
|
|
|
|
/* Change the working directory to the root directory */
|
|
/* or another appropriated directory */
|
|
chdir("/");
|
|
|
|
/* Close all open file descriptors */
|
|
for (fd = sysconf(_SC_OPEN_MAX); fd > 0; fd--) {
|
|
close(fd);
|
|
}
|
|
|
|
/* Reopen stdin (fd = 0), stdout (fd = 1), stderr (fd = 2) */
|
|
stdin = fopen("/dev/null", "r");
|
|
stdout = fopen("/dev/null", "w+");
|
|
stderr = fopen("/dev/null", "w+");
|
|
|
|
/* Try to write PID of daemon to lockfile */
|
|
if (!pidFile.empty())
|
|
{
|
|
CLog::logInfo("pidfile");
|
|
|
|
m_pid_fd = open(pidFile.c_str(), O_RDWR|O_CREAT, 0640);
|
|
if (m_pid_fd < 0) {
|
|
/* Can't open lockfile */
|
|
return DR_PIDFILE_FAILED;
|
|
}
|
|
if (lockf(m_pid_fd, F_TLOCK, 0) < 0) {
|
|
/* Can't lock file */
|
|
return DR_PIDFILE_FAILED;
|
|
}
|
|
|
|
m_pidFileName.assign(pidFile);
|
|
|
|
/* Get current PID */
|
|
char str[256];
|
|
sprintf(str, "%d\n", getpid());
|
|
/* Write PID to lockfile */
|
|
write(m_pid_fd, str, strlen(str));
|
|
}
|
|
|
|
return DR_CHILD;
|
|
}
|
|
|
|
void CDaemon::finalize()
|
|
{
|
|
if(m_pid_fd != -1) {
|
|
lockf(m_pid_fd, F_ULOCK, 0);
|
|
close(m_pid_fd);
|
|
}
|
|
|
|
if(!m_pidFileName.empty()) {
|
|
unlink(m_pidFileName.c_str());
|
|
}
|
|
} |