gfaservices/app/visu/main.cpp

#include <signal.h>
#include <atomic>
#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <gfa/qappctrl.h>
#include <gfa/svc/common/instance.h>
#include <gfa/svc/common/debug.h>
#include <gfa/svc/shmqml/shmthread.h>
#include "projal.h"

#define _APP_ID								GFA_APPCTRL_APPID_USER_11
#define _APP_NAME							"qmlDemo"
#define _UPDATE_TIMER_INT					50
#define _UPDATE_TIMER_INT_HEAVY_LOAD		5000
#define _APP_SUBSCRIPTIONS					(GFA_APPCTRL_APPID_ALL_GFA | GFA_APPCTRL_APPID_USER_11)

#define _SIG_BLOCK(s)						sigprocmask(SIG_BLOCK, (s), NULL)
#define _SIG_UNBLOCK(s)						sigprocmask(SIG_UNBLOCK, (s), NULL)

static sigset_t								g_set;
static std::atomic_uintptr_t				g_appPtr(0);


static void _SigHandler(int sig)
{
	QGuiApplication *pApp = (QGuiApplication*)g_appPtr.load();
	if(pApp)
		pApp->exit(-sig);
}

#undef GfaIpcLockSHM
#undef GfaIpcUnlockSHM

static void _LockSHM(HSHM hShm)
{
	::GfaIpcLockSHMAndSigBlock(hShm, &g_set);
}

static void _UnlockSHM(HSHM hShm)
{
	::GfaIpcUnlockSHMAndSigUnblock(hShm, &g_set);
}

int main(int argc, char *argv[])
{
    /////////////////////////////////////////////////////////////////////////
    // check for multiple instances

    CProcessInstance pi;

    if(!pi.LockInstance(UUID_SHM))
    {
        ETRACE("Failed to start instance!\n");
        return -1;
    }

    /////////////////////////////////////////////////////////////////////////
	// configure signal handling

	struct sigaction sa;
	::sigfillset(&g_set);
	::sigdelset(&g_set, SIGSEGV);
	memset(&sa, 0, sizeof(sa));

	sa.sa_handler = _SigHandler;
    sigaction(SIGHUP, &sa, NULL);	// handles user's terminal disconnect
    sigaction(SIGQUIT, &sa, NULL);	// handles Ctrl + '\'
	sigaction(SIGTERM, &sa, NULL);	// handles normal termination
	sigaction(SIGABRT, &sa, NULL);	// handles abnormal termination (i.e. abort())
	sigaction(SIGINT, &sa, NULL);	// handles Ctrl + 'C'

	sa.sa_handler = SIG_IGN;
    sigaction(SIGTSTP, &sa, NULL);	// ignores Ctrl + 'Z'
    sigaction(SIGSTOP, &sa, NULL);	// ignores Stop
    sigaction(SIGCONT, &sa, NULL);	// ignores Continue
    sigaction(SIGCHLD, &sa, NULL);	// ignores child process termination
    sigaction(0, &sa, NULL);		// ignores shell termination

	set_lock_unlock_functions(_LockSHM, _UnlockSHM);

    /////////////////////////////////////////////////////////////////////////

    qputenv("QT_IM_MODULE", QByteArray("QtFreeVirtualKeyboard"));

    /////////////////////////////////////////////////////////////////////////

	QGfaAppCtrl appCtrl;
    QGuiApplication app(argc, argv);
    g_appPtr.store((uintptr_t)&app);
    QQmlApplicationEngine engine;

    int nRet = -1;
    HSHM hShm = NULL;

    if(appCtrl.Create(_APP_ID, _APP_NAME, _UPDATE_TIMER_INT, _UPDATE_TIMER_INT_HEAVY_LOAD))
    {
		appCtrl.SetLockUnlockFunctions(_LockSHM, _UnlockSHM);
		appCtrl.SubscribeStateEvents(_APP_SUBSCRIPTIONS);
		appCtrl.SetState(GIAS_Initializing);

	    if((hShm = acquire_shm(sizeof(shm_t))))
	    {
	        void *pShm = ::GfaIpcAcquirePointer(hShm);

	        if(pShm)
	        {
	            CShm_t shm(pShm, hShm, NULL);
	            CShmWatcher<CShm_t, shm_t> watcher(hShm, shm, pShm);
	            watcher.SetLockUnlockFunctions(_LockSHM, _UnlockSHM);
	            register_types(engine, &shm);

				appCtrl.RegisterQmlTypes(engine, 1, 0);
                engine.load(QUrl(QStringLiteral("qrc:/qml/main.qml")));
				appCtrl.SetState(GIAS_Running);

	            watcher.StartWatch(_SHM_SCAN_INTERVAL_MS);
	            nRet = app.exec();
	            watcher.StopWatch();

	            ::GfaIpcReleasePointer(hShm, pShm);
	        }

	        ::GfaIpcReleaseSHM(hShm);
	    }

		appCtrl.SetState(GIAS_Terminating);
		appCtrl.Release();
	}

    g_appPtr.store(0);
    return nRet;
}