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/*
* SPDX license identifier: MPL-2.0
*
* Copyright (C) 2011-2015, BMW AG
*
* This file is part of GENIVI Project DLT - Diagnostic Log and Trace.
*
* This Source Code Form is subject to the terms of the
* Mozilla Public License (MPL), v. 2.0.
* If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/.
*
* For further information see http://www.genivi.org/.
*/
/*!
* \author Lassi Marttala <lassi.lm.marttala@partner.bmw.de>
*
* \copyright Copyright © 2011-2015 BMW AG. \n
* License MPL-2.0: Mozilla Public License version 2.0 http://mozilla.org/MPL/2.0/.
*
* \file dlt-system-process-handling.c
*/
/*******************************************************************************
** **
** SRC-MODULE: dlt-systemprocess-handling.c **
** **
** TARGET : linux **
** **
** PROJECT : DLT **
** **
** AUTHOR : Lassi Marttala <lassi.lm.marttala@partner.bmw.de> **
** **
** PURPOSE : **
** **
** REMARKS : **
** **
** PLATFORM DEPENDANT [yes/no]: yes **
** **
** TO BE CHANGED BY USER [yes/no]: no **
** **
*******************************************************************************/
#include "dlt.h"
#include "dlt-system.h"
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/wait.h>
#include <pthread.h>
#include <limits.h>
volatile DltSystemThreads threads;
DLT_IMPORT_CONTEXT(dltsystem)
int daemonize()
{
DLT_LOG(dltsystem, DLT_LOG_DEBUG,
DLT_STRING("dlt-system-process-handling, daemonize"));
/* Fork new process */
int f = fork();
if (f < 0)
return f;
if (f > 0)
exit(0);
/* Create a new process group */
if (setsid() < 0)
return -1;
/**
* Close all file descriptors and point
* stdin, stdout and stderr to /dev/null
*/
int i;
for (i = getdtablesize(); i >= 0; i--)
close(i);
int fd = open("/dev/null", O_RDWR);
if (fd < 0)
return -1;
if ((dup(fd) < 0) || (dup(fd) < 0)) {
close(fd);
return -1;
}
/**
* Ignore signals related to child processes and
* terminal handling.
*/
signal(SIGCHLD, SIG_IGN);
signal(SIGTSTP, SIG_IGN);
signal(SIGTTOU, SIG_IGN);
signal(SIGTTIN, SIG_IGN);
/*no close(fd); - we just intentionally pointed stdx to null! tbd: set ignore for coverity */
return 0;
}
void start_threads(DltSystemConfiguration *config)
{
DLT_LOG(dltsystem, DLT_LOG_DEBUG,
DLT_STRING("dlt-system-process-handling, start threads"));
int i;
threads.count = 0;
threads.shutdown = 0;
for (i = 0; i < MAX_THREADS; i++)
threads.threads[i] = 0;
#if defined(DLT_SYSTEMD_WATCHDOG_ENABLE)
start_thread(config, watchdog_thread, "systemd watchdog");
#endif
if (config->Shell.Enable)
init_shell();
if (config->LogFile.Enable)
start_thread(config, logfile_thread, "log file");
#if defined(DLT_FILETRANSFER_ENABLE)
if (config->Filetransfer.Enable)
start_thread(config, filetransfer_thread, "file transfer");
#endif
if (config->LogProcesses.Enable)
start_thread(config, logprocess_thread, "log process");
if (config->Syslog.Enable)
start_thread(config, syslog_thread, "syslog");
#if defined(DLT_SYSTEMD_JOURNAL_ENABLE)
if (config->Journal.Enable)
start_thread(config, journal_thread, "systemd journal");
#endif
}
/**
* Start a thread and add it to the thread pool.
*/
void start_thread(DltSystemConfiguration *conf,
void (thread)(void *), const char *name)
{
if (threads.count == MAX_THREADS) {
DLT_LOG(dltsystem, DLT_LOG_ERROR,
DLT_STRING("Could not create thread for "),
DLT_STRING(name),
DLT_STRING("Out of thread slots.\n"));
return;
}
DLT_LOG(dltsystem, DLT_LOG_DEBUG, DLT_STRING("Creating thread for "),
DLT_STRING(name),
DLT_STRING("\n"));
pthread_t pt;
if (pthread_create(&pt, NULL, (void *)thread, conf) == 0)
threads.threads[threads.count++] = pt;
else
DLT_LOG(dltsystem, DLT_LOG_ERROR,
DLT_STRING("Could not create thread for "),
DLT_STRING(name),
DLT_STRING("\n"));
}
/**
* Wait for threads to exit.
* There's not actually a condition currently
* to bail out of file transfer without a signal.
*/
void join_threads()
{
int i;
DLT_LOG(dltsystem, DLT_LOG_DEBUG,
DLT_STRING("dlt-system-process-handling, waiting for threads to exit."));
if (threads.count < 1) {
DLT_LOG(dltsystem, DLT_LOG_DEBUG,
DLT_STRING("dlt-system-process-handling, no threads, waiting for signal."));
sleep(UINT_MAX);
}
else {
DLT_LOG(dltsystem, DLT_LOG_DEBUG,
DLT_STRING("dlt-system-process-handling, thread count: "),
DLT_INT(threads.count));
for (i = 0; i < threads.count; i++) {
pthread_join(threads.threads[i], NULL);
DLT_LOG(dltsystem, DLT_LOG_DEBUG,
DLT_STRING("dlt-system-process-handling, thread exit: "),
DLT_INT(threads.threads[i]));
}
}
}
void dlt_system_signal_handler(int sig)
{
DLT_LOG(dltsystem, DLT_LOG_DEBUG,
DLT_STRING("dlt-system-process-handling, signal handler"));
switch (sig) {
case SIGHUP:
case SIGTERM:
case SIGINT:
case SIGQUIT:
DLT_LOG(dltsystem, DLT_LOG_DEBUG,
DLT_STRING("dlt-system-process-handling, exit, signal: "),
DLT_INT(sig));
exit(0);
break;
default:
DLT_LOG(dltsystem, DLT_LOG_WARN,
DLT_STRING("dlt-system-process-handling, unknown signal!"));
break;
}
}
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