srvmain.c

一个linux下的根文件系统的源码

	if(rootwp->psd->PreSelect)
		rootwp->psd->PreSelect(rootwp->psd);

	/* Set up the FDs for use in the main select(): */
	FD_ZERO(&rfds);
	if(mouse_fd >= 0) {
		FD_SET(mouse_fd, &rfds);
		if (mouse_fd > setsize)
			setsize = mouse_fd;
	}
	if(keyb_fd >= 0) {
		FD_SET(keyb_fd, &rfds);
		if (keyb_fd > setsize)
			setsize = keyb_fd;
	}
#if NONETWORK
	/* handle registered input file descriptors*/
	for (fd = 0; fd < regfdmax; fd++) {
		if (!FD_ISSET(fd, &regfdset))
			continue;

		FD_SET(fd, &rfds);
		if (fd > setsize) setsize = fd;
	}
#else /* not NONETWORK */
	/* handle client socket connections*/
	FD_SET(un_sock, &rfds);
	if (un_sock > setsize) setsize = un_sock;
	curclient = root_client;
	while(curclient) {
		if(curclient->waiting_for_event && curclient->eventhead) {
			curclient->waiting_for_event = FALSE;
			GrGetNextEventWrapperFinish(curclient->id);
			return;
		}
		FD_SET(curclient->id, &rfds);
		if(curclient->id > setsize) setsize = curclient->id;
		curclient = curclient->next;
	}
#endif /* NONETWORK */
	/* Set up the timeout for the main select(): */
	if (timeout == (GR_TIMEOUT) -1L) {
		/* poll*/
		tout.tv_sec = 0;
		tout.tv_usec = 0;
		to = &tout;
	} else {
#if MW_FEATURE_TIMERS
		if(GdGetNextTimeout(&tout, timeout) == TRUE)
			to = &tout;
		else
#endif /* MW_FEATURE_TIMERS */
			to = NULL;
	}

	/* Wait for some input on any of the fds in the set or a timeout: */
	if((e = select(setsize+1, &rfds, NULL, NULL, to)) > 0) {
		/* If data is present on the mouse fd, service it: */
		if(mouse_fd >= 0 && FD_ISSET(mouse_fd, &rfds))
			while(GsCheckMouseEvent())
				continue;

		/* If data is present on the keyboard fd, service it: */
		if(keyb_fd >= 0 && FD_ISSET(keyb_fd, &rfds))
			while(GsCheckKeyboardEvent())
				continue;

#if NONETWORK
		/* check for input on registered file descriptors */
		for (fd = 0; fd < regfdmax; fd++) {
			GR_EVENT_FDINPUT *	gp;

			if (!FD_ISSET(fd, &regfdset)  ||  !FD_ISSET(fd, &rfds))
				continue;

			gp =(GR_EVENT_FDINPUT *)GsAllocEvent(curclient);
			if(gp) {
				gp->type = GR_EVENT_TYPE_FDINPUT;
				gp->fd = fd;
			}
		}
#else /* not NONETWORK */

		/* If a client is trying to connect, accept it: */
		if(FD_ISSET(un_sock, &rfds))
			GsAcceptClient();

		/* If a client is sending us a command, handle it: */
		curclient = root_client;
		while(curclient) {
			GR_CLIENT *curclient_next;

			/* curclient may be freed in GsDropClient*/
			curclient_next = curclient->next;
			if(FD_ISSET(curclient->id, &rfds))
				GsHandleClient(curclient->id);
			curclient = curclient_next;
		}
#endif /* NONETWORK */
	} 
	else if (e == 0) {
#if NONETWORK
		/* 
		 * Timeout has occured.  Currently return
		 * a timeout event regardless of whether
		 * client has selected for it.
		 * Note: this will be changed back to GR_EVENT_TYPE_NONE
		 * for the GrCheckNextEvent/LINK_APP_TO_SERVER case
		 */
#if MW_FEATURE_TIMERS
		if(GdTimeout() == TRUE)
#endif
		{
			GR_EVENT_GENERAL *	gp;
			gp = (GR_EVENT_GENERAL *)GsAllocEvent(curclient);
			if(gp)
				gp->type = GR_EVENT_TYPE_TIMEOUT;
		}
#else /* not NONETWORK */
#if MW_FEATURE_TIMERS
		GdTimeout();
#endif
#endif /* NONETWORK */
	} else
		if(errno != EINTR)
			EPRINTF("Select() call in main failed\n");
}

#if NONETWORK
/*
 * Prepare for the client to call select().  Asks the server to send the next
 * event but does not wait around for it to arrive.  Initializes the
 * specified fd_set structure with the client/server socket descriptor and any
 * previously registered external file descriptors.  Also compares the current
 * contents of maxfd, the client/server socket descriptor, and the previously
 * registered external file descriptors, and returns the highest of them in
 * maxfd.
 *
 * Usually used in conjunction with GrServiceSelect().
 *
 * Note that in a multithreaded client, the application must ensure that
 * no Nano-X calls are made between the calls to GrPrepareSelect() and
 * GrServiceSelect(), else there will be race conditions.
 *
 * @param maxfd  Pointer to a variable which the highest in use fd will be
 *               written to.  Must contain a valid value on input - will only
 *               be overwritten if the new value is higher than the old
 *               value.
 * @param rfdset Pointer to the file descriptor set structure to use.  Must
 *               be valid on input - file descriptors will be added to this
 *               set without clearing the previous contents.
 */
void
GrPrepareSelect(int *maxfd, void *rfdset)
{
	fd_set *rfds = (fd_set *) rfdset;
	int fd;

	SERVER_LOCK();

	/* perform pre-select duties, if any*/
	if(rootwp->psd->PreSelect)
		rootwp->psd->PreSelect(rootwp->psd);

	if(mouse_fd >= 0) {
		FD_SET(mouse_fd, rfds);
		if (mouse_fd > *maxfd)
			*maxfd = mouse_fd;
	}
	if(keyb_fd >= 0) {
		FD_SET(keyb_fd, rfds);
		if (keyb_fd > *maxfd)
			*maxfd = keyb_fd;
	}

	/* handle registered input file descriptors*/
	for (fd = 0; fd < regfdmax; fd++) {
		if (!FD_ISSET(fd, &regfdset))
			continue;

		FD_SET(fd, rfds);
		if (fd > *maxfd)
			*maxfd = fd;
	}

	SERVER_UNLOCK();
}

/*
 * Handles events after the client has done a select() call.
 *
 * Calls the specified callback function is an event has arrived, or if
 * there is data waiting on an external fd specified by GrRegisterInput().
 *
 * Used by GrMainLoop().
 *
 * @param rfdset Pointer to the file descriptor set containing those file
 *               descriptors that are ready for reading.
 * @param fncb   Pointer to the function to call when an event needs handling.
 */
void
GrServiceSelect(void *rfdset, GR_FNCALLBACKEVENT fncb)
{
	fd_set *	rfds = rfdset;
	GR_EVENT_LIST *	elp;
	GR_EVENT 	ev;
	int fd;

	SERVER_LOCK();

	/* If data is present on the mouse fd, service it: */
	if(mouse_fd >= 0 && FD_ISSET(mouse_fd, rfds))
		while(GsCheckMouseEvent())
			continue;

	/* If data is present on the keyboard fd, service it: */
	if(keyb_fd >= 0 && FD_ISSET(keyb_fd, rfds))
		while(GsCheckKeyboardEvent())
			continue;

	/* Dispatch all queued events */
	while((elp = curclient->eventhead) != NULL) {

		ev = elp->event;

		/* Remove first event from queue*/
		curclient->eventhead = elp->next;
		if (curclient->eventtail == elp)
			curclient->eventtail = NULL;

		elp->next = eventfree;
		eventfree = elp;

		fncb(&ev);
	}

	/* check for input on registered file descriptors */
	for (fd = 0; fd < regfdmax; fd++) {
		if (!FD_ISSET(fd, &regfdset) || !FD_ISSET(fd, rfds))
			continue;

		ev.type = GR_EVENT_TYPE_FDINPUT;
		ev.fdinput.fd = fd;
		fncb(&ev);
	}

	SERVER_UNLOCK();
}

#endif /* NONETWORK */

#endif /* UNIX && defined(HAVESELECT)*/

#if VTSWITCH
static void
CheckVtChange(void *arg)
{
	if(MwCheckVtChange())
		GsRedrawScreen();
	GdAddTimer(50, CheckVtChange, NULL);
}
#endif
  
/*
 * Initialize the graphics and mouse devices at startup.
 * Returns nonzero with a message printed if the initialization failed.
 */
int
GsInitialize(void)
{
	GR_WINDOW	*wp;		/* root window */
	PSD		psd;
	GR_CURSOR_ID	cid;
	static MWIMAGEBITS cursorbits[16] = {
	      0xe000, 0x9800, 0x8600, 0x4180,
	      0x4060, 0x2018, 0x2004, 0x107c,
	      0x1020, 0x0910, 0x0988, 0x0544,
	      0x0522, 0x0211, 0x000a, 0x0004
	};
	static MWIMAGEBITS cursormask[16] = {
	      0xe000, 0xf800, 0xfe00, 0x7f80,
	      0x7fe0, 0x3ff8, 0x3ffc, 0x1ffc,
	      0x1fe0, 0x0ff0, 0x0ff8, 0x077c,
	      0x073e, 0x021f, 0x000e, 0x0004
	};

	/* If needed, initialize the server mutex. */
	SERVER_LOCK_INIT();

	setbuf(stdout, NULL);
	setbuf(stderr, NULL);

	wp = (GR_WINDOW *) malloc(sizeof(GR_WINDOW));
	if (wp == NULL) {
		EPRINTF("Cannot allocate root window\n");
		return -1;
	}

	startTicks = GsGetTickCount();

#ifndef MW_NOSIGNALS
	/* catch terminate signal to restore tty state*/
	signal(SIGTERM, (void *)GsTerminate);
#endif

#if MW_FEATURE_TIMERS
	screensaver_delay = 0;
#endif
	screensaver_active = GR_FALSE;

	selection_owner.wid = 0;
	selection_owner.typelist = NULL;

#if !NONETWORK
#ifndef MW_NOSIGNALS
	/* ignore pipe signal, sent when clients exit*/
	signal(SIGPIPE, SIG_IGN);
	signal(SIGHUP, SIG_IGN);
#endif

	if (GsOpenSocket() < 0) {
		EPRINTF("Cannot bind to named socket\n");
		free(wp);
		return -1;
	}
#endif

	if ((keyb_fd = GdOpenKeyboard()) == -1) {
		EPRINTF("Cannot initialise keyboard\n");
		/*GsCloseSocket();*/
		free(wp);
		return -1;
	}

	if ((psd = GdOpenScreen()) == NULL) {
		EPRINTF("Cannot initialise screen\n");
		/*GsCloseSocket();*/
		GdCloseKeyboard();
		free(wp);
		return -1;
	}
	GdSetPortraitMode(psd, portraitmode);

	if ((mouse_fd = GdOpenMouse()) == -1) {
		EPRINTF("Cannot initialise mouse\n");
		/*GsCloseSocket();*/
		GdCloseScreen(psd);
		GdCloseKeyboard();
		free(wp);
		return -1;
	}

	/*
	 * Create std font.
	 */
#if (HAVE_BIG5_SUPPORT | HAVE_GB2312_SUPPORT | HAVE_JISX0213_SUPPORT | HAVE_KSC5601_SUPPORT)
	/* system fixed font looks better when mixed with builtin fixed fonts*/
	stdfont = GdCreateFont(psd, MWFONT_SYSTEM_FIXED, 0, NULL);
#else
	stdfont = GdCreateFont(psd, MWFONT_SYSTEM_VAR, 0, NULL);
#endif

	/*
	 * Initialize the root window.
	 */
	wp->psd = psd;
	wp->id = GR_ROOT_WINDOW_ID;
	wp->parent = NULL;		/* changed: was = NULL*/
	wp->owner = NULL;
	wp->children = NULL;
	wp->siblings = NULL;
	wp->next = NULL;
	wp->x = 0;
	wp->y = 0;
	wp->width = psd->xvirtres;
	wp->height = psd->yvirtres;
	wp->bordersize = 0;
	wp->background = BLACK;
	wp->bordercolor = wp->background;
	wp->nopropmask = 0;
	wp->bgpixmap = NULL;
	wp->bgpixmapflags = GR_BACKGROUND_TILE;
	wp->eventclients = NULL;
	wp->cursorid = 0;
	wp->mapped = GR_TRUE;
	wp->realized = GR_TRUE;
	wp->output = GR_TRUE;
	wp->props = 0;
	wp->title = NULL;
	wp->clipregion = NULL;

        listpp = NULL;
	listwp = wp;
	rootwp = wp;
	focuswp = wp;
	mousewp = wp;
	focusfixed = GR_FALSE;

	/*
	 * Initialize and position the default cursor.
	 */
	curcursor = NULL;
	cursorx = -1;
	cursory = -1;
	GdShowCursor(psd);
	GrMoveCursor(psd->xvirtres / 2, psd->yvirtres / 2);
	cid = GrNewCursor(16, 16, 0, 0, WHITE, BLACK, cursorbits, cursormask);
	GrSetWindowCursor(GR_ROOT_WINDOW_ID, cid);
	stdcursor = GsFindCursor(cid);

#if VTSWITCH
	MwInitVt();
	/* Check for VT change every 50 ms: */
	GdAddTimer(50, CheckVtChange, NULL);
#endif
	psd->FillRect(psd, 0, 0, psd->xvirtres-1, psd->yvirtres-1,
		GdFindColor(psd, wp->background));

	/*
	 * Tell the mouse driver some things.
	 */
	curbuttons = 0;
	GdRestrictMouse(0, 0, psd->xvirtres - 1, psd->yvirtres - 1);
	GdMoveMouse(psd->xvirtres / 2, psd->yvirtres / 2);

	/* Force root window screen paint*/
	GsRedrawScreen();

	/* 
	 * Force the cursor to appear on the screen at startup.
	 * (not required with above GsRedrawScreen)
	GdHideCursor(psd);
	GdShowCursor(psd);
	 */

	/*
	 * All done.
	 */
	connectcount = 0;
	return 0;
}

/*
 * Here to close down the server.
 */
void
GsTerminate(void)
{
#if !NONETWORK
	GsCloseSocket();
#endif
	GdCloseScreen(rootwp->psd);
	GdCloseMouse();
	GdCloseKeyboard();
#if VTSWITCH
	MwRedrawVt(mwvterm);
#endif
	exit(0);
}

/*
 * Return # milliseconds elapsed since start of Microwindows
 * Granularity is 25 msec
 */
GR_TIMEOUT
GsGetTickCount(void)
{
#if MSDOS
#include <time.h>
	return (unsigned long)(clock() * 1000 / CLOCKS_PER_SEC);
#else
#if _MINIX
	struct tms	t;
	
	return (unsigned long)times(&t) * 16;
#else
#if UNIX
	struct timeval t;

	gettimeofday(&t, NULL);
	return ((t.tv_sec * 1000) + (t.tv_usec / 25000) * 25) - startTicks;
#else
	return 0L;
#endif
#endif
#endif
}

void
GrBell(void)
{
	SERVER_LOCK();
	write(2, "\7", 1);
	SERVER_UNLOCK();
}