779 lines
17 KiB
C++
779 lines
17 KiB
C++
/*
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* synergy -- mouse and keyboard sharing utility
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* Copyright (C) 2002 Chris Schoeneman
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*
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* This package is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* found in the file COPYING that should have accompanied this file.
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*
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* This package is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include "CServer.h"
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#include "CConfig.h"
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#include "IPrimaryScreenFactory.h"
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#include "ProtocolTypes.h"
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#include "Version.h"
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#include "XScreen.h"
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#include "CTCPSocketFactory.h"
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#include "XSocket.h"
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#include "CLock.h"
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#include "CMutex.h"
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#include "CThread.h"
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#include "XThread.h"
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#include "CLog.h"
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#include "LogOutputters.h"
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#include "CArch.h"
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#include "CArchMiscWindows.h"
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#include "stdfstream.h"
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#include <cstring>
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#define DAEMON_RUNNING(running_)
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#if WINDOWS_LIKE
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#include "CMSWindowsPrimaryScreen.h"
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#include "resource.h"
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#undef DAEMON_RUNNING
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#define DAEMON_RUNNING(running_) CArchMiscWindows::daemonRunning(running_)
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#elif UNIX_LIKE
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#include "CXWindowsPrimaryScreen.h"
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#endif
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// platform dependent name of a daemon
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#if WINDOWS_LIKE
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#define DAEMON_NAME "Synergy Server"
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#elif UNIX_LIKE
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#define DAEMON_NAME "synergys"
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#endif
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// configuration file name
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#if WINDOWS_LIKE
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#define USR_CONFIG_NAME "synergy.sgc"
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#define SYS_CONFIG_NAME "synergy.sgc"
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#elif UNIX_LIKE
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#define USR_CONFIG_NAME ".synergy.conf"
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#define SYS_CONFIG_NAME "synergy.conf"
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#endif
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//
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// program arguments
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//
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#define ARG CArgs::s_instance
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class CArgs {
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public:
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CArgs() :
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m_pname(NULL),
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m_backend(false),
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m_restartable(true),
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m_daemon(true),
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m_configFile(NULL),
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m_logFilter(NULL)
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{ s_instance = this; }
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~CArgs() { s_instance = NULL; }
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public:
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static CArgs* s_instance;
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const char* m_pname;
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bool m_backend;
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bool m_restartable;
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bool m_daemon;
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const char* m_configFile;
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const char* m_logFilter;
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CString m_name;
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CNetworkAddress m_synergyAddress;
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CNetworkAddress m_httpAddress;
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CConfig m_config;
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};
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CArgs* CArgs::s_instance = NULL;
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//
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// platform dependent factories
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//
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//! Factory for creating primary screens
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/*!
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Objects of this type create primary screens appropriate for the
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platform.
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*/
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class CPrimaryScreenFactory : public IPrimaryScreenFactory {
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public:
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CPrimaryScreenFactory() { }
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virtual ~CPrimaryScreenFactory() { }
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// IPrimaryScreenFactory overrides
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virtual CPrimaryScreen*
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create(IScreenReceiver*, IPrimaryScreenReceiver*);
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};
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CPrimaryScreen*
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CPrimaryScreenFactory::create(IScreenReceiver* receiver,
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IPrimaryScreenReceiver* primaryReceiver)
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{
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#if WINDOWS_LIKE
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return new CMSWindowsPrimaryScreen(receiver, primaryReceiver);
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#elif UNIX_LIKE
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return new CXWindowsPrimaryScreen(receiver, primaryReceiver);
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#endif
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}
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//
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// platform independent main
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//
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static CServer* s_server = NULL;
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static
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int
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realMain(void)
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{
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int result = kExitSuccess;
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do {
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bool opened = false;
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bool locked = true;
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try {
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// if configuration has no screens then add this system
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// as the default
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if (ARG->m_config.begin() == ARG->m_config.end()) {
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ARG->m_config.addScreen(ARG->m_name);
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}
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// set the contact address, if provided, in the config.
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// otherwise, if the config doesn't have an address, use
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// the default.
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if (ARG->m_synergyAddress.isValid()) {
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ARG->m_config.setSynergyAddress(ARG->m_synergyAddress);
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}
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else if (!ARG->m_config.getSynergyAddress().isValid()) {
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ARG->m_config.setSynergyAddress(CNetworkAddress(kDefaultPort));
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}
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// set HTTP address if provided
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if (ARG->m_httpAddress.isValid()) {
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ARG->m_config.setHTTPAddress(ARG->m_httpAddress);
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}
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// create server
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s_server = new CServer(ARG->m_name);
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s_server->setConfig(ARG->m_config);
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s_server->setScreenFactory(new CPrimaryScreenFactory);
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s_server->setSocketFactory(new CTCPSocketFactory);
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s_server->setStreamFilterFactory(NULL);
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// open server
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try {
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s_server->open();
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opened = true;
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// run server
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DAEMON_RUNNING(true);
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locked = false;
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s_server->mainLoop();
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// clean up
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#define FINALLY do { \
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if (!locked) { \
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DAEMON_RUNNING(false); \
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locked = true; \
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} \
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if (s_server != NULL) { \
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if (opened) { \
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s_server->close(); \
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} \
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} \
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delete s_server; \
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s_server = NULL; \
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} while (false)
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FINALLY;
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}
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catch (XScreenUnavailable& e) {
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// wait before retrying if we're going to retry
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if (ARG->m_restartable) {
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ARCH->sleep(e.getRetryTime());
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}
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else {
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result = kExitFailed;
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}
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FINALLY;
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}
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catch (XThread&) {
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FINALLY;
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throw;
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}
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catch (...) {
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// don't try to restart and fail
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ARG->m_restartable = false;
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result = kExitFailed;
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FINALLY;
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}
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#undef FINALLY
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}
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catch (XBase& e) {
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LOG((CLOG_CRIT "failed: %s", e.what()));
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}
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catch (XThread&) {
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// terminated
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ARG->m_restartable = false;
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result = kExitTerminated;
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}
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} while (ARG->m_restartable);
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return result;
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}
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//
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// command line parsing
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//
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#define BYE "\nTry `%s --help' for more information."
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static void (*bye)(int) = &exit;
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static
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void
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version()
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{
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LOG((CLOG_PRINT
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"%s %s, protocol version %d.%d\n"
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"%s",
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ARG->m_pname,
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kVersion,
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kProtocolMajorVersion,
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kProtocolMinorVersion,
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kCopyright));
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}
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static
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void
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help()
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{
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#if WINDOWS_LIKE
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# define PLATFORM_ARGS \
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" {--daemon|--no-daemon}"
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# define PLATFORM_DESC
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# define PLATFORM_EXTRA \
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"At least one command line argument is required. If you don't otherwise\n" \
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"need an argument use `--daemon'.\n" \
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"\n"
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#else
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# define PLATFORM_ARGS \
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" [--daemon|--no-daemon]"
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# define PLATFORM_DESC
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# define PLATFORM_EXTRA
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#endif
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LOG((CLOG_PRINT
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"Usage: %s"
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" [--address <address>]"
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" [--config <pathname>]"
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" [--debug <level>]"
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" [--name <screen-name>]"
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" [--restart|--no-restart]\n"
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PLATFORM_ARGS
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"\n"
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"Start the synergy mouse/keyboard sharing server.\n"
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"\n"
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" -a, --address <address> listen for clients on the given address.\n"
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" -c, --config <pathname> use the named configuration file instead.\n"
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" -d, --debug <level> filter out log messages with priorty below level.\n"
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" level may be: FATAL, ERROR, WARNING, NOTE, INFO,\n"
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" DEBUG, DEBUG1, DEBUG2.\n"
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" -f, --no-daemon run the server in the foreground.\n"
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"* --daemon run the server as a daemon.\n"
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" -n, --name <screen-name> use screen-name instead the hostname to identify\n"
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" this screen in the configuration.\n"
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" -1, --no-restart do not try to restart the server if it fails for\n"
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" some reason.\n"
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"* --restart restart the server automatically if it fails.\n"
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PLATFORM_DESC
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" -h, --help display this help and exit.\n"
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" --version display version information and exit.\n"
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"\n"
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"* marks defaults.\n"
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"\n"
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PLATFORM_EXTRA
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"The argument for --address is of the form: [<hostname>][:<port>]. The\n"
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"hostname must be the address or hostname of an interface on the system.\n"
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"The default is to listen on all interfaces. The port overrides the\n"
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"default port, %d.\n"
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"\n"
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"If no configuration file pathname is provided then the first of the\n"
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"following to load successfully sets the configuration:\n"
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" %s\n"
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" %s\n"
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"If no configuration file can be loaded then the configuration uses its\n"
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"defaults with just the server screen.\n"
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"\n"
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"Where log messages go depends on the platform and whether or not the\n"
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"server is running as a daemon.",
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ARG->m_pname,
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kDefaultPort,
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ARCH->concatPath(
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ARCH->getUserDirectory(),
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USR_CONFIG_NAME).c_str(),
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ARCH->concatPath(
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ARCH->getSystemDirectory(),
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SYS_CONFIG_NAME).c_str()));
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}
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static
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bool
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isArg(int argi, int argc, const char** argv,
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const char* name1, const char* name2,
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int minRequiredParameters = 0)
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{
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if ((name1 != NULL && strcmp(argv[argi], name1) == 0) ||
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(name2 != NULL && strcmp(argv[argi], name2) == 0)) {
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// match. check args left.
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if (argi + minRequiredParameters >= argc) {
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LOG((CLOG_PRINT "%s: missing arguments for `%s'" BYE,
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ARG->m_pname, argv[argi], ARG->m_pname));
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bye(kExitArgs);
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}
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return true;
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}
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// no match
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return false;
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}
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static
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void
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parse(int argc, const char** argv)
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{
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assert(ARG->m_pname != NULL);
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assert(argv != NULL);
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assert(argc >= 1);
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// set defaults
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ARG->m_name = ARCH->getHostName();
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// parse options
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int i;
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for (i = 1; i < argc; ++i) {
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if (isArg(i, argc, argv, "-d", "--debug", 1)) {
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// change logging level
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ARG->m_logFilter = argv[++i];
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}
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else if (isArg(i, argc, argv, "-a", "--address", 1)) {
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// save listen address
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try {
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ARG->m_synergyAddress = CNetworkAddress(argv[i + 1],
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kDefaultPort);
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}
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catch (XSocketAddress& e) {
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LOG((CLOG_PRINT "%s: %s" BYE,
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ARG->m_pname, e.what(), ARG->m_pname));
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bye(kExitArgs);
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}
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++i;
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}
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else if (isArg(i, argc, argv, NULL, "--http", 1)) {
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// save listen address
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try {
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ARG->m_httpAddress = CNetworkAddress(argv[i + 1],
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kDefaultPort + 1);
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}
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catch (XSocketAddress& e) {
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LOG((CLOG_PRINT "%s: %s" BYE,
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ARG->m_pname, e.what(), ARG->m_pname));
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bye(kExitArgs);
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}
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++i;
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}
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else if (isArg(i, argc, argv, "-n", "--name", 1)) {
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// save screen name
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ARG->m_name = argv[++i];
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}
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else if (isArg(i, argc, argv, "-c", "--config", 1)) {
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// save configuration file path
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ARG->m_configFile = argv[++i];
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}
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else if (isArg(i, argc, argv, "-f", "--no-daemon")) {
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// not a daemon
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ARG->m_daemon = false;
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}
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else if (isArg(i, argc, argv, NULL, "--daemon")) {
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// daemonize
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ARG->m_daemon = true;
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}
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else if (isArg(i, argc, argv, "-1", "--no-restart")) {
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// don't try to restart
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ARG->m_restartable = false;
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}
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else if (isArg(i, argc, argv, NULL, "--restart")) {
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// try to restart
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ARG->m_restartable = true;
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}
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else if (isArg(i, argc, argv, "-z", NULL)) {
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ARG->m_backend = true;
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}
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else if (isArg(i, argc, argv, "-h", "--help")) {
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help();
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bye(kExitSuccess);
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}
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else if (isArg(i, argc, argv, NULL, "--version")) {
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version();
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bye(kExitSuccess);
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}
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else if (isArg(i, argc, argv, "--", NULL)) {
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// remaining arguments are not options
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++i;
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break;
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}
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else if (argv[i][0] == '-') {
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LOG((CLOG_PRINT "%s: unrecognized option `%s'" BYE,
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ARG->m_pname, argv[i], ARG->m_pname));
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bye(kExitArgs);
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}
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else {
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// this and remaining arguments are not options
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break;
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}
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}
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// no non-option arguments are allowed
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if (i != argc) {
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LOG((CLOG_PRINT "%s: unrecognized option `%s'" BYE,
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ARG->m_pname, argv[i], ARG->m_pname));
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bye(kExitArgs);
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}
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// increase default filter level for daemon. the user must
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// explicitly request another level for a daemon.
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if (ARG->m_daemon && ARG->m_logFilter == NULL) {
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#if WINDOWS_LIKE
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if (CArchMiscWindows::isWindows95Family()) {
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// windows 95 has no place for logging so avoid showing
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// the log console window.
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ARG->m_logFilter = "FATAL";
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}
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else
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#endif
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{
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ARG->m_logFilter = "NOTE";
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}
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}
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// set log filter
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if (!CLOG->setFilter(ARG->m_logFilter)) {
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LOG((CLOG_PRINT "%s: unrecognized log level `%s'" BYE,
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ARG->m_pname, ARG->m_logFilter, ARG->m_pname));
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bye(kExitArgs);
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}
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}
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static
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bool
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loadConfig(const char* pathname, bool require)
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{
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assert(pathname != NULL);
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try {
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// load configuration
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LOG((CLOG_DEBUG "opening configuration \"%s\"", pathname));
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std::ifstream configStream(pathname);
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if (!configStream) {
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throw XConfigRead("cannot open file");
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}
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configStream >> ARG->m_config;
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LOG((CLOG_DEBUG "configuration read successfully"));
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return true;
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}
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catch (XConfigRead& e) {
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if (require) {
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LOG((CLOG_PRINT "%s: cannot read configuration '%s': %s",
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ARG->m_pname, pathname, e.what()));
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bye(kExitConfig);
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}
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else {
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LOG((CLOG_DEBUG "cannot read configuration \"%s\": %s",
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pathname, e.what()));
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}
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}
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return false;
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}
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static
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void
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loadConfig()
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{
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// load the config file, if specified
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if (ARG->m_configFile != NULL) {
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// require the user specified file to load correctly
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loadConfig(ARG->m_configFile, true);
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}
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// load the default configuration if no explicit file given
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else {
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// get the user's home directory. use the effective user id
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// so a user can't get a setuid root program to load his file.
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bool loaded = false;
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CString path = ARCH->getUserDirectory();
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if (!path.empty()) {
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// complete path
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path = ARCH->concatPath(path, USR_CONFIG_NAME);
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// now try loading the user's configuration
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loaded = loadConfig(path.c_str(), false);
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}
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if (!loaded) {
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// try the system-wide config file
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path = ARCH->getSystemDirectory();
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if (!path.empty()) {
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path = ARCH->concatPath(path, SYS_CONFIG_NAME);
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loadConfig(path.c_str(), false);
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}
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}
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}
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}
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static
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void
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useSystemLog()
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{
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// redirect log messages
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ILogOutputter* logger = new CSystemLogOutputter;
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logger->open(DAEMON_NAME);
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CLOG->insert(new CStopLogOutputter);
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CLOG->insert(logger);
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}
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//
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// platform dependent entry points
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//
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#if WINDOWS_LIKE
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#include "CMSWindowsScreen.h"
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static bool s_hasImportantLogMessages = false;
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//
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// CMessageBoxOutputter
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//
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// This class writes severe log messages to a message box
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//
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class CMessageBoxOutputter : public ILogOutputter {
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public:
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CMessageBoxOutputter() { }
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virtual ~CMessageBoxOutputter() { }
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// ILogOutputter overrides
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virtual void open(const char*) { }
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virtual void close() { }
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virtual bool write(ELevel level, const char* message);
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virtual const char* getNewline() const { return ""; }
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};
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bool
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CMessageBoxOutputter::write(ELevel level, const char* message)
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{
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// note any important messages the user may need to know about
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if (level <= CLog::kWARNING) {
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s_hasImportantLogMessages = true;
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}
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// FATAL and PRINT messages get a dialog box if not running as
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// backend. if we're running as a backend the user will have
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// a chance to see the messages when we exit.
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if (!ARG->m_backend && level <= CLog::kFATAL) {
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MessageBox(NULL, message, ARG->m_pname, MB_OK | MB_ICONWARNING);
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return false;
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}
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else {
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return true;
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}
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}
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static
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void
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byeThrow(int x)
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{
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CArchMiscWindows::daemonFailed(x);
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}
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static
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int
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daemonStartup(int argc, const char** argv)
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{
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useSystemLog();
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// catch errors that would normally exit
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bye = &byeThrow;
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// parse command line
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parse(argc, argv);
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// cannot run as backend if running as a service
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ARG->m_backend = false;
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// load configuration
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loadConfig();
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// run as a service
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return CArchMiscWindows::runDaemon(realMain);
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}
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static
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int
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daemonStartup95(int, const char**)
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{
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useSystemLog();
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return realMain();
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}
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int WINAPI
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WinMain(HINSTANCE instance, HINSTANCE, LPSTR, int)
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{
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CArch arch;
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CLOG;
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CArgs args;
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// save instance
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CMSWindowsScreen::init(instance);
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// get program name
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ARG->m_pname = ARCH->getBasename(__argv[0]);
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// send PRINT and FATAL output to a message box
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CLOG->insert(new CMessageBoxOutputter);
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// windows NT family starts services using no command line options.
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// since i'm not sure how to tell the difference between that and
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// a user providing no options we'll assume that if there are no
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// arguments and we're on NT then we're being invoked as a service.
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// users on NT can use `--daemon' or `--no-daemon' to force us out
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// of the service code path.
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if (__argc <= 1 && !CArchMiscWindows::isWindows95Family()) {
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int result = kExitFailed;
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try {
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result = ARCH->daemonize(DAEMON_NAME, &daemonStartup);
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}
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catch (XArchDaemon& e) {
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LOG((CLOG_CRIT "failed to start as a service: %s" BYE, e.what().c_str(), ARG->m_pname));
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}
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delete CLOG;
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return result;
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}
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// parse command line
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parse(__argc, const_cast<const char**>(__argv));
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// load configuration
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loadConfig();
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// daemonize if requested
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int result;
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if (ARG->m_daemon) {
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// start as a daemon
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if (CArchMiscWindows::isWindows95Family()) {
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try {
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result = ARCH->daemonize(DAEMON_NAME, &daemonStartup95);
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}
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catch (XArchDaemon& e) {
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LOG((CLOG_CRIT "failed to start as a service: %s" BYE, e.what().c_str(), ARG->m_pname));
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result = kExitFailed;
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}
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}
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else {
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// cannot start a service from the command line so just
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// run normally (except with log messages redirected).
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useSystemLog();
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result = realMain();
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}
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}
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else {
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// run
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result = realMain();
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}
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// let user examine any messages if we're running as a backend
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// by putting up a dialog box before exiting.
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if (ARG->m_backend && s_hasImportantLogMessages) {
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char msg[1024];
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msg[0] = '\0';
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LoadString(instance, IDS_FAILED, msg, sizeof(msg) / sizeof(msg[0]));
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MessageBox(NULL, msg, ARG->m_pname, MB_OK | MB_ICONWARNING);
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}
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delete CLOG;
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return result;
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}
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#elif UNIX_LIKE
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static
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int
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daemonStartup(int, const char**)
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{
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useSystemLog();
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return realMain();
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}
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int
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main(int argc, char** argv)
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{
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CArch arch;
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CLOG;
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CArgs args;
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// get program name
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ARG->m_pname = ARCH->getBasename(argv[0]);
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// parse command line
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parse(argc, const_cast<const char**>(argv));
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// load configuration
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loadConfig();
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// daemonize if requested
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int result;
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if (ARG->m_daemon) {
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try {
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result = ARCH->daemonize(DAEMON_NAME, &daemonStartup);
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}
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catch (XArchDaemon&) {
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LOG((CLOG_CRIT "failed to daemonize"));
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result = kExitFailed;
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}
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}
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else {
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result = realMain();
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}
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return result;
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}
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#else
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#error no main() for platform
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#endif
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