srvmain.c

一个linux下的根文件系统的源码

/*
 * Copyright (c) 1999, 2000, 2001, 2003 Greg Haerr <[e-mail]>
 * Portions Copyright (c) 2002 by Koninklijke Philips Electronics N.V.
 * Copyright (c) 1991 David I. Bell
 * Permission is granted to use, distribute, or modify this source,
 * provided that this copyright notice remains intact.
 *
 * Main module of graphics server.
 */
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>

#ifdef __PACIFIC__
#include <unixio.h>
#else
#include <errno.h>
#include <sys/types.h>
#endif

#ifdef DOS_TURBOC
#include <io.h>
#endif

#define MWINCLUDECOLORS
#include "serv.h"
#if UNIX | DOS_DJGPP
#include <unistd.h>
#if _MINIX
#include <sys/times.h>
#else
#include <sys/time.h>
#endif
#endif

#if ELKS
#include <linuxmt/posix_types.h>
#include <linuxmt/time.h>
#endif

/*
 * External definitions defined here.
 */
GR_WINDOW_ID	cachewindowid;		/* cached window id */
GR_WINDOW_ID    cachepixmapid;         /* cached pixmap id */
GR_GC_ID	cachegcid;		/* cached graphics context id */
GR_WINDOW	*cachewp;		/* cached window pointer */
GR_GC		*cachegcp;		/* cached graphics context */
GR_PIXMAP       *cachepp;               /* cached pixmap */
GR_PIXMAP       *listpp;                /* List of all pixmaps */
GR_WINDOW	*listwp;		/* list of all windows */
GR_WINDOW	*rootwp;		/* root window pointer */
GR_GC		*listgcp;		/* list of all gc */
GR_REGION	*listregionp;		/* list of all regions */
GR_FONT		*listfontp;		/* list of all fonts */
#if MW_FEATURE_IMAGES
GR_IMAGE	*listimagep;		/* list of all images */
#endif
GR_CURSOR	*listcursorp;		/* list of all cursors */
GR_CURSOR	*stdcursor;		/* root window cursor */
GR_GC		*curgcp;		/* currently enabled gc */
GR_WINDOW	*clipwp;		/* window clipping is set for */
GR_WINDOW	*focuswp;		/* focus window for keyboard */
GR_WINDOW	*mousewp;		/* window mouse is currently in */
GR_WINDOW	*grabbuttonwp;		/* window grabbed by button */
GR_CURSOR	*curcursor;		/* currently enabled cursor */
GR_COORD	cursorx;		/* current x position of cursor */
GR_COORD	cursory;		/* current y position of cursor */
GR_BUTTON	curbuttons;		/* current state of buttons */
GR_CLIENT	*curclient;		/* client currently executing for */
GR_EVENT_LIST	*eventfree;		/* list of free events */
GR_BOOL		focusfixed;		/* TRUE if focus is fixed on a window */
PMWFONT		stdfont;		/* default font*/
int		escape_quits = TRUE;	/* terminate when pressing ESC */
char		*progname;		/* Name of this program.. */

int		current_fd;		/* the fd of the client talking to */
int		connectcount = 0;	/* number of connections to server */
GR_CLIENT	*root_client;		/* root entry of the client table */
GR_CLIENT	*current_client;	/* the client we are currently talking*/
char		*current_shm_cmds;
int		current_shm_cmds_size;
int		keyb_fd;		/* the keyboard file descriptor */
int		mouse_fd;		/* the mouse file descriptor */
char		*curfunc;		/* the name of the current server func*/
GR_BOOL		screensaver_active;	/* time before screensaver activates */
GR_SELECTIONOWNER selection_owner;	/* the selection owner and typelist */
GR_TIMEOUT	startTicks;		/* ms time server started*/
int		autoportrait = FALSE;	/* auto portrait mode switching*/
MWCOORD		nxres;			/* requested server x resolution*/
MWCOORD		nyres;			/* requested server y resolution*/

#if MW_FEATURE_TIMERS
GR_TIMEOUT	screensaver_delay;	/* time before screensaver activates */
GR_TIMER_ID     cache_timer_id;         /* cached timer ID */
GR_TIMER        *cache_timer;           /* cached timer */
GR_TIMER        *list_timer;            /* list of all timers */
#endif /* MW_FEATURE_TIMERS */
GR_GRABBED_KEY  *list_grabbed_keys = NULL;     /* list of all grabbed keys */

static int	persistent_mode = FALSE;
static int	portraitmode = MWPORTRAIT_NONE;

SERVER_LOCK_DECLARE /* Mutex for all public functions (only if NONETWORK and THREADSAFE) */

#if !NONETWORK
int		un_sock;		/* the server socket descriptor */

static void
usage(void)
{
	printf("Usage: %s [-e] [-p] [-A] [-NLRD] [-x#] [-y#] [-c <fontconfig-file> ...]\n",
		progname);
	exit(1);
}

/*
 * This is the main server loop which initialises the server, services
 * the clients, and shuts the server down when there are no more clients.
 */
int
main(int argc, char *argv[])
{
	int t;

	progname = argv[0];

	t = 1;
	while ( t < argc ) {
		if ( !strcmp("-e",argv[t])) {
			escape_quits = FALSE;
			++t;
			continue;
		}
		if ( !strcmp("-p",argv[t]) ) {
			persistent_mode = TRUE;
			++t;
			continue;
		}
		if ( !strcmp("-A",argv[t]) ) {
			autoportrait = TRUE;
			++t;
			continue;
		}
		if ( !strcmp("-N",argv[t]) ) {
			portraitmode = MWPORTRAIT_NONE;
			++t;
			continue;
		}
		if ( !strcmp("-L",argv[t]) ) {
			portraitmode = MWPORTRAIT_LEFT;
			++t;
			continue;
		}
		if ( !strcmp("-R",argv[t]) ) {
			portraitmode = MWPORTRAIT_RIGHT;
			++t;
			continue;
		}
		if ( !strcmp("-D",argv[t]) ) {
			portraitmode = MWPORTRAIT_DOWN;
			++t;
			continue;
		}
		if ( !strcmp("-x",argv[t]) ) {
			if (++t >= argc)
				usage();
			nxres = atoi(argv[t]);
			++t;
			continue;
		}
		if ( !strcmp("-y",argv[t]) ) {
			if (++t >= argc)
				usage();
			nyres = atoi(argv[t]);
			++t;
			continue;
		}
#if FONTMAPPER
		if ( !strcmp("-c",argv[t]) ) {
			int read_configfile(char *file);

			if (++t >= argc)
				usage();
			read_configfile(argv[t]);
			++t;
			continue;
		}
#endif
		usage();
	}

	/* Attempt to initialise the server*/
	if(GsInitialize() < 0)
		exit(1);

	while(1)
		GsSelect(0L);
	return 0;
}
#endif

void
GsAcceptClientFd(int i)
{
	GR_CLIENT *client, *cl;

	if(!(client = malloc(sizeof(GR_CLIENT)))) {
		close(i);
		return;
	}

	client->id = i;
	client->eventhead = NULL;
	client->eventtail = NULL;
	/*client->errorevent.type = GR_EVENT_TYPE_NONE;*/
	client->next = NULL;
	client->prev = NULL;
	client->waiting_for_event = FALSE;
	client->shm_cmds = 0;

	if(connectcount++ == 0)
		root_client = client;
	else {
		cl = root_client;
			while(cl->next)
				cl = cl->next;
		client->prev = cl;
		cl->next = client;
	}
}

/*
 * Open a connection from a new client to the server.
 * Returns -1 on failure.
 */
int
GrOpen(void)
{
#if NONETWORK
	SERVER_LOCK();
	escape_quits = 1;

	/* Client calls this routine once.  We 
	 * init everything here
	 */
	if (connectcount <= 0) {
		if(GsInitialize() < 0) {
			SERVER_UNLOCK();
			return -1;
		}
		GsAcceptClientFd(999);
		curclient = root_client;
	}
	SERVER_UNLOCK();
#endif
        return 1;
}

/*
 * Close the current connection to the server.
 */
void
GrClose(void)
{
	SERVER_LOCK();
	GsClose(current_fd);
	SERVER_UNLOCK();
}

/*
 * Drop a specific server connection.
 */
void
GsClose(int fd)
{
	GsDropClient(fd);
	if(!persistent_mode && connectcount == 0)
		GsTerminate();
}

#if NONETWORK
/* client/server GsDropClient is in srvnet.c*/
void
GsDropClient(int fd)
{
	--connectcount;
}
#endif

#if UNIX | DOS_DJGPP
#if NONETWORK && defined(HAVESELECT)
/*
 * Register the specified file descriptor to return an event
 * when input is ready.
 */

static int regfdmax = -1;
static fd_set regfdset;

void
GrRegisterInput(int fd)
{
	SERVER_LOCK();
	FD_SET(fd, &regfdset);
	if (fd >= regfdmax) regfdmax = fd + 1;
	SERVER_UNLOCK();
}

void
GrUnregisterInput(int fd)
{
	int i, max;

	SERVER_LOCK();

	/* unregister all inputs if the FD is -1 */
	if (fd == -1) {
		FD_ZERO(&regfdset);
		regfdmax = -1;
		SERVER_UNLOCK();
		return;
	}

	FD_CLR(fd, &regfdset);
	/* recalculate the max file descriptor */
	for (i = 0, max = regfdmax, regfdmax = -1; i < max; i++)
		if (FD_ISSET(i, &regfdset))
			regfdmax = i + 1;

	SERVER_UNLOCK();
}

#endif /* NONETWORK && HAVESELECT */
#endif /* UNIX | DOS_DJGPP*/

/*
 * This function suspends execution of the program for the specified
 * number of milliseconds.
 */
void
GrDelay(GR_TIMEOUT msecs)
{
#if UNIX
	struct timeval timeval;

	timeval.tv_sec = msecs / 1000;
	timeval.tv_usec = (msecs % 1000) * 1000;
	select(0, NULL, NULL, NULL, &timeval);
#endif
}

#if NONETWORK
void
GrFlush(void)
{
}

void
GrMainLoop(GR_FNCALLBACKEVENT fncb)
{
	GR_EVENT event;

	for(;;) {
		GrGetNextEvent(&event);
		fncb(&event);
	}
}

void
GrReqShmCmds(long shmsize)
{
	/* no action required, no client/server*/
}
#endif


#if VXWORKS

#define POLLTIME	100   /* polling sleep interval (in msec) */
#define MAX_MOUSEEVENTS	10    /* max number of mouse event to get in 1 select */
#define MAX_KEYBDEVENTS	10    /* max number of mouse event to get in 1 select */

extern void GdSleep(int dwMilliseconds);

void 
GsSelect(GR_TIMEOUT timeout)
{
	int mouseevents = 0;
	int keybdevents = 0;
	GR_TIMEOUT waittime = 0;
	GR_EVENT_GENERAL *gp;


	/* input gathering loop */
	while (1)
	{

		/* perform pre-select duties, if any */
		if(scrdev.PreSelect)
		{
			scrdev.PreSelect(&scrdev);
		}


		/* If mouse data present, service it */
		while (mousedev.Poll() > 0)
		{
			GsCheckMouseEvent();
			if (mouseevents++ > MAX_MOUSEEVENTS)
			{
				/* don't handle too many events at one shot */
				break;
			}
		}


		/* If keyboard data present, service it */
		while (kbddev.Poll() > 0)
		{
			GsCheckKeyboardEvent();
			if (keybdevents++ > MAX_KEYBDEVENTS)
			{
				/* don't handle too many events at one shot */
				break;
			}
		}

		
		/* did we process any input yet? */
		if ((mouseevents > 0) || (keybdevents > 0))
		{
			/* yep -- return without sleeping */
			return;
		}


		/* give up time-slice & sleep for a bit */
		GdSleep(POLLTIME);
		waittime += POLLTIME; 


		/* have we timed out? */
		if (waittime >= timeout)
		{
			/* special case: polling when timeout == 0 -- don't send timeout event */
			if (timeout != 0)
			{
				/* Timeout has occured.  
				** Currently return a timeout event regardless of whether client 
				**   has selected for it.
				*/
				if ((gp = (GR_EVENT_GENERAL *)GsAllocEvent(curclient)) != NULL)
				{
					gp->type = GR_EVENT_TYPE_TIMEOUT;
				}
			}
			return;
		}
	}

}

#elif MSDOS | _MINIX

void
GsSelect(GR_TIMEOUT timeout)
{
	/* If mouse data present, service it*/
	if(mousedev.Poll())
		while(GsCheckMouseEvent())
			continue;

	/* If keyboard data present, service it*/
	if(kbddev.Poll())
		while(GsCheckKeyboardEvent())
			continue;

}

#elif UNIX && defined(HAVESELECT)

void
GsSelect(GR_TIMEOUT timeout)
{
	fd_set	rfds;
	int 	e;
	int	setsize = 0;
	struct timeval tout;
	struct timeval *to;
#if NONETWORK
	int	fd;
#endif

	/* perform pre-select duties, if any*/