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smproxy.c

/* $Xorg: smproxy.c,v 1.6 2001/02/09 02:05:35 xorgcvs Exp $ */
/******************************************************************************

Copyright 1994, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.

Author:  Ralph Mor, X Consortium
******************************************************************************/
/* $XFree86: xc/programs/smproxy/smproxy.c,v 3.8 2001/10/28 03:34:25 tsi Exp $ */

#include "smproxy.h"
#include <unistd.h>
#include <X11/Xmu/WinUtil.h>

XtAppContext appContext;
Display *disp;

Atom wmProtocolsAtom;
Atom wmSaveYourselfAtom;
Atom wmStateAtom;
Atom smClientIdAtom;
Atom wmClientLeaderAtom;

Bool debug = 0;

SmcConn proxy_smcConn;
XtInputId proxy_iceInputId;
char *proxy_clientId = NULL;

WinInfo *win_head = NULL;

int proxy_count = 0;
int die_count = 0;

Bool ok_to_die = 0;

Bool caught_error = 0;

Bool sent_save_done = 0;

int Argc;
char **Argv;

Bool HasSaveYourself ( Window window );
Bool HasXSMPsupport ( Window window );
WinInfo * GetClientLeader ( WinInfo *winptr );
char * CheckFullyQuantifiedName ( char *name, int *newstring );
void FinishSaveYourself ( WinInfo *winInfo, Bool has_WM_SAVEYOURSELF );
void SaveYourselfCB ( SmcConn smcConn, SmPointer clientData, int saveType, 
                  Bool shutdown, int interactStyle, Bool fast );
void DieCB ( SmcConn smcConn, SmPointer clientData );
void SaveCompleteCB ( SmcConn smcConn, SmPointer clientData );
void ShutdownCancelledCB ( SmcConn smcConn, SmPointer clientData );
void ProcessIceMsgProc ( XtPointer client_data, int *source, XtInputId *id );
void NullIceErrorHandler ( IceConn iceConn, Bool swap, 
                     int offendingMinorOpCode, 
                     unsigned long offendingSequence, 
                     int errorClass, int severity, IcePointer values );
void ConnectClientToSM ( WinInfo *winInfo );
int MyErrorHandler ( Display *display, XErrorEvent *event );
Bool LookupWindow ( Window window, WinInfo **ptr_ret, WinInfo **prev_ptr_ret );
WinInfo * AddNewWindow ( Window window );
void RemoveWindow ( WinInfo *winptr );
void Got_WM_STATE ( WinInfo *winptr );
void HandleCreate ( XCreateWindowEvent *event );
void HandleDestroy ( XDestroyWindowEvent *event );
void HandleUpdate ( XPropertyEvent *event );
void ProxySaveYourselfPhase2CB ( SmcConn smcConn, SmPointer clientData );
void ProxySaveYourselfCB ( SmcConn smcConn, SmPointer clientData, 
                     int saveType, Bool shutdown, int interactStyle, 
                     Bool fast );
void ProxyDieCB ( SmcConn smcConn, SmPointer clientData );
void ProxySaveCompleteCB ( SmcConn smcConn, SmPointer clientData );
void ProxyShutdownCancelledCB ( SmcConn smcConn, SmPointer clientData );
Status ConnectProxyToSM ( char *previous_id );
void CheckForExistingWindows ( Window root );


Bool
HasSaveYourself (window)

Window window;

{
    Atom *protocols;
    int numProtocols;
    int i, found;

    protocols = NULL;

    if (XGetWMProtocols (disp, window, &protocols, &numProtocols) != True)
      return (False);

    found = 0;

    if (protocols != NULL)
    {
      for (i = 0; i < numProtocols; i++)
          if (protocols[i] == wmSaveYourselfAtom)
            found = 1;

      XFree (protocols);
    }

    return (found);
}



Bool
HasXSMPsupport (window)

Window window;

{
    XTextProperty tp;
    Bool hasIt = 0;

    if (XGetTextProperty (disp, window, &tp, smClientIdAtom))
    {
      if (tp.encoding == XA_STRING && tp.format == 8 && tp.nitems != 0)
          hasIt = 1;

      if (tp.value)
          XFree ((char *) tp.value);
    }

    return (hasIt);
}



WinInfo *
GetClientLeader (winptr)

WinInfo *winptr;

{
    Atom actual_type;
    int actual_format;
    unsigned long nitems, bytesafter;
    unsigned long *datap = NULL;
    WinInfo *leader_winptr = NULL;
    Bool failure = 0;

    if (XGetWindowProperty (disp, winptr->window, wmClientLeaderAtom,
      0L, 1L, False, AnyPropertyType,     &actual_type, &actual_format,
      &nitems, &bytesafter, (unsigned char **) &datap) == Success)
    {
      if (actual_type == XA_WINDOW && actual_format == 32 &&
          nitems == 1 && bytesafter == 0)
      {
          Window leader_win = *((Window *) datap);

          if (!LookupWindow (leader_win, &leader_winptr, NULL))
            failure = 1;
      }

      if (datap)
          XFree (datap);
    }

    if (failure)
    {
      /* The client leader was defined, but we couldn't find the window */

      return (NULL);
    }
    else if (leader_winptr)
    {
      /* We found the real client leader */

      return (leader_winptr);
    }
    else
    {
      /* There is no client leader defined, return this window */

      return (winptr);
    }
}



char *
CheckFullyQuantifiedName (name, newstring)

char *name;
int *newstring;

{
    /*
     * Due to a bug in Xlib (for hpux in particular), some clients
     * will have a WM_CLIENT_MACHINE that is not fully quantified.
     * For example, we might get "excon" instead of "excon.x.org".
     * This really stinks.  The best we can do is tag on our own
     * domain name.
     */

    if (strchr (name, '.') != NULL)
    {
      *newstring = 0;
      return (name);
    }
    else
    {
      char hostnamebuf[80];
      char *firstDot;

      gethostname (hostnamebuf, sizeof hostnamebuf);
      firstDot = strchr (hostnamebuf, '.');

      if (!firstDot)
      {
          *newstring = 0;
          return (name);
      }
      else
      {
          int bytes = strlen (name) + strlen (firstDot + 1) + 2;
          char *newptr;

          newptr = (char *) malloc (bytes);
          sprintf (newptr, "%s.%s", name, firstDot + 1);

          *newstring = 1;
          return (newptr);
      }
    }
}



void FinishSaveYourself (winInfo, has_WM_SAVEYOURSELF)

WinInfo *winInfo;
Bool has_WM_SAVEYOURSELF;

{
    SmProp prop1, prop2, prop3, *props[3];
    SmPropValue prop1val, prop2val, prop3val;
    int i;

    if (!winInfo->got_first_save_yourself)
    {
      char userId[20], restartService[80];
      char *fullyQuantifiedName;
      int newstring;

      prop1.name = SmProgram;
      prop1.type = SmARRAY8;
      prop1.num_vals = 1;
      prop1.vals = &prop1val;
      prop1val.value = (SmPointer) winInfo->wm_command[0];
      prop1val.length = strlen (winInfo->wm_command[0]);
    
      sprintf (userId, "%ld", (long)getuid());
      prop2.name = SmUserID;
      prop2.type = SmARRAY8;
      prop2.num_vals = 1;
      prop2.vals = &prop2val;
      prop2val.value = (SmPointer) userId;
      prop2val.length = strlen (userId);
    
      fullyQuantifiedName = CheckFullyQuantifiedName (
          (char *) winInfo->wm_client_machine.value, &newstring);
      sprintf (restartService, "rstart-rsh/%s", fullyQuantifiedName);
      if (newstring)
          free (fullyQuantifiedName);

      prop3.name = "_XC_RestartService";
      prop3.type = SmLISTofARRAY8;
      prop3.num_vals = 1;
      prop3.vals = &prop3val;
      prop3val.value = (SmPointer) restartService;
      prop3val.length = strlen (restartService);

      props[0] = &prop1;
      props[1] = &prop2;
      props[2] = &prop3;
      
      SmcSetProperties (winInfo->smc_conn, 3, props);

      winInfo->got_first_save_yourself = 1;
    }

    prop1.name = SmRestartCommand;
    prop1.type = SmLISTofARRAY8;
    prop1.num_vals = winInfo->wm_command_count;
    
    prop1.vals = (SmPropValue *) malloc (
      winInfo->wm_command_count * sizeof (SmPropValue));
    
    if (!prop1.vals)
    {
      SmcSaveYourselfDone (winInfo->smc_conn, False);
      return;
    }

    for (i = 0; i < winInfo->wm_command_count; i++)
    {
      prop1.vals[i].value = (SmPointer) winInfo->wm_command[i];
      prop1.vals[i].length = strlen (winInfo->wm_command[i]);
    }
    
    prop2.name = SmCloneCommand;
    prop2.type = SmLISTofARRAY8;
    prop2.num_vals = winInfo->wm_command_count;
    prop2.vals = prop1.vals;
    
    props[0] = &prop1;
    props[1] = &prop2;
    
    SmcSetProperties (winInfo->smc_conn, 2, props);
    
    free ((char *) prop1.vals);
    
    /*
     * If the client doesn't support WM_SAVE_YOURSELF, we should
     * return failure for the save, since we really don't know if
     * the application needed to save state.
     */

    SmcSaveYourselfDone (winInfo->smc_conn, has_WM_SAVEYOURSELF);
}



void
SaveYourselfCB (smcConn, clientData, saveType, shutdown, interactStyle, fast)

SmcConn smcConn;
SmPointer clientData;
int saveType;
Bool shutdown;
int interactStyle;
Bool fast;

{
    WinInfo *winInfo = (WinInfo *) clientData;

    if (!winInfo->has_save_yourself)
    {
      FinishSaveYourself (winInfo, False);
    }
    else
    {
      XClientMessageEvent saveYourselfMessage;


      /* Send WM_SAVE_YOURSELF */

      saveYourselfMessage.type = ClientMessage;
      saveYourselfMessage.window = winInfo->window;
      saveYourselfMessage.message_type = wmProtocolsAtom;
      saveYourselfMessage.format = 32;
      saveYourselfMessage.data.l[0] = wmSaveYourselfAtom;
      saveYourselfMessage.data.l[1] = CurrentTime;

      if (XSendEvent (disp, winInfo->window, False, NoEventMask,
          (XEvent *) &saveYourselfMessage))
      {
          winInfo->waiting_for_update = 1;

          if (debug)
          {
            printf ("Sent SAVE YOURSELF to 0x%x\n", 
                  (unsigned int)winInfo->window);    
            printf ("\n");
          }
      }
      else
      {
          if (debug)
          {
            printf ("Failed to send SAVE YOURSELF to 0x%x\n",
                (unsigned int)winInfo->window);    
            printf ("\n");
          }
      }
    }
}



void
DieCB (smcConn, clientData)

SmcConn smcConn;
SmPointer clientData;

{
    WinInfo *winInfo = (WinInfo *) clientData;

    SmcCloseConnection (winInfo->smc_conn, 0, NULL);
    winInfo->smc_conn = NULL;
    XtRemoveInput (winInfo->input_id);

    /* Now tell the client to die */

    if (debug)
      printf ("Trying to kill 0x%x\n", (unsigned int)winInfo->window);

    XSync (disp, 0);
    XKillClient (disp, winInfo->window);
    XSync (disp, 0);


    /*
     * Proxy must exit when all clients die, and the proxy itself
     * must have received a Die.
     */

    die_count++;

    if (die_count == proxy_count && ok_to_die)
    {
      exit (0);
    }
}



void
SaveCompleteCB (smcConn, clientData)

SmcConn smcConn;
SmPointer clientData;

{
    /*
     * Nothing to do here.
     */
}



void
ShutdownCancelledCB (smcConn, clientData)

SmcConn smcConn;
SmPointer clientData;

{
    /*
     * Since we did not request to interact or request save yourself
     * phase 2, we know we already sent the save yourself done, so
     * there is nothing to do here.
     */
}



void
ProcessIceMsgProc (client_data, source, id)

XtPointer   client_data;
int         *source;
XtInputId   *id;

{
    IceConn ice_conn = (IceConn) client_data;

    IceProcessMessages (ice_conn, NULL, NULL);
}



void
NullIceErrorHandler (iceConn, swap,
    offendingMinorOpcode, offendingSequence, errorClass, severity, values)

IceConn           iceConn;
Bool        swap;
int         offendingMinorOpcode;
unsigned long     offendingSequence;
int         errorClass;
int         severity;
IcePointer  values;

{
    return;
}


void
ConnectClientToSM (winInfo)

WinInfo *winInfo;

{
    char errorMsg[256];
    unsigned long mask;
    SmcCallbacks callbacks;
    IceConn ice_conn;
    char *prevId;

    mask = SmcSaveYourselfProcMask | SmcDieProcMask |
      SmcSaveCompleteProcMask | SmcShutdownCancelledProcMask;

    callbacks.save_yourself.callback = SaveYourselfCB;
    callbacks.save_yourself.client_data = (SmPointer) winInfo;

    callbacks.die.callback = DieCB;
    callbacks.die.client_data = (SmPointer) winInfo;

    callbacks.save_complete.callback = SaveCompleteCB;
    callbacks.save_complete.client_data = (SmPointer) winInfo;

    callbacks.shutdown_cancelled.callback = ShutdownCancelledCB;
    callbacks.shutdown_cancelled.client_data = (SmPointer) winInfo;

    prevId = LookupClientID (winInfo);

    /*
     * In case a protocol error occurs when opening the connection,
     * (e.g. an authentication error), we set a null error handler
     * before the open, then restore the default handler after the open.
     */

    IceSetErrorHandler (NullIceErrorHandler);

    winInfo->smc_conn = SmcOpenConnection (
      NULL,                   /* use SESSION_MANAGER env */
      (SmPointer) winInfo,    /* force a new connection */
      SmProtoMajor,
      SmProtoMinor,
      mask,
      &callbacks,
      prevId,
      &winInfo->client_id,
      256, errorMsg);

    IceSetErrorHandler (NULL);

    if (winInfo->smc_conn == NULL)
      return;

    ice_conn = SmcGetIceConnection (winInfo->smc_conn);

    winInfo->input_id = XtAppAddInput (
          appContext,
          IceConnectionNumber (ice_conn),
            (XtPointer) XtInputReadMask,
          ProcessIceMsgProc,
          (XtPointer) ice_conn);

    if (debug)
    {
      printf ("Connected to SM, window = 0x%x\n", 
            (unsigned int)winInfo->window);
      printf ("\n");
    }

    proxy_count++;
}



int
MyErrorHandler (display, event)

Display *display;
XErrorEvent *event;

{
    caught_error = 1;
    return 0;
}



Bool
LookupWindow (window, ptr_ret, prev_ptr_ret)

Window window;
WinInfo **ptr_ret;
WinInfo **prev_ptr_ret;

{
    WinInfo *ptr, *prev;

    ptr = win_head;
    prev = NULL;

    while (ptr)
    {
      if (ptr->window == window)
          break;
      else
      {
          prev = ptr;
          ptr = ptr->next;
      }
    }

    if (ptr)
    {
      if (ptr_ret)
          *ptr_ret = ptr;
      if (prev_ptr_ret)
          *prev_ptr_ret = prev;
      return (1);
    }
    else
      return (0);
}



WinInfo *
AddNewWindow (window)

Window window;

{
    WinInfo *newptr;

    if (LookupWindow (window, NULL, NULL))
      return (NULL);

    newptr = (WinInfo *) malloc (sizeof (WinInfo));

    if (newptr == NULL)
      return (NULL);

    newptr->next = win_head;
    win_head = newptr;

    newptr->window = window;
    newptr->smc_conn = NULL;
    newptr->tested_for_sm_client_id = 0;
    newptr->client_id = NULL;
    newptr->wm_command = NULL;
    newptr->wm_command_count = 0;
    newptr->class.res_name = NULL;
    newptr->class.res_class = NULL;
    newptr->wm_name = NULL;
    newptr->wm_client_machine.value = NULL;
    newptr->wm_client_machine.nitems = 0;
    newptr->has_save_yourself = 0;
    newptr->waiting_for_update = 0;
    newptr->got_first_save_yourself = 0;

    return (newptr);
}



void
RemoveWindow (winptr)

WinInfo *winptr;

{
    WinInfo *ptr, *prev;

    if (LookupWindow (winptr->window, &ptr, &prev))
    {
      if (prev == NULL)
          win_head = ptr->next;
      else
          prev->next = ptr->next;

      if (ptr->client_id)
          free (ptr->client_id);
      
      if (ptr->wm_command)
          XFreeStringList (ptr->wm_command);
      
      if (ptr->wm_name)
          XFree (ptr->wm_name);
      
      if (ptr->wm_client_machine.value)
          XFree (ptr->wm_client_machine.value);
      
      if (ptr->class.res_name)
          XFree (ptr->class.res_name);
      
      if (ptr->class.res_class)
          XFree (ptr->class.res_class);
      
      free ((char *) ptr);
    }
}



void
Got_WM_STATE (winptr)

WinInfo *winptr;

{
    WinInfo *leader_winptr;

    /*
     * If we already got WM_STATE and tested for SM_CLIENT_ID, we
     * shouldn't do it again.
     */

    if (winptr->tested_for_sm_client_id)
    {
      return;
    }


    /*
     * Set a null error handler, in case this window goes away
     * behind our back.
     */

    caught_error = 0;
    XSetErrorHandler (MyErrorHandler);


    /*
     * Get the client leader window.
     */

    leader_winptr = GetClientLeader (winptr);

    if (caught_error)
    {
      caught_error = 0;
      RemoveWindow (winptr);
      XSetErrorHandler (NULL);
      return;
    }


    /*
     * If we already checked for SM_CLIENT_ID on the client leader
     * window, don't do it again.
     */

    if (!leader_winptr || leader_winptr->tested_for_sm_client_id)
    {
      caught_error = 0;
      XSetErrorHandler (NULL);
      return;
    }

    leader_winptr->tested_for_sm_client_id = 1;

    if (!HasXSMPsupport (leader_winptr->window))
    {
      XFetchName (disp, leader_winptr->window, &leader_winptr->wm_name);

      XGetCommand (disp, leader_winptr->window,
          &leader_winptr->wm_command,
          &leader_winptr->wm_command_count);

      XGetClassHint (disp, leader_winptr->window, &leader_winptr->class);

      XGetWMClientMachine (disp, leader_winptr->window,
          &leader_winptr->wm_client_machine);

      if (leader_winptr->wm_name != NULL &&
          leader_winptr->wm_command != NULL &&
          leader_winptr->wm_command_count > 0 &&
          leader_winptr->class.res_name != NULL &&
          leader_winptr->class.res_class != NULL &&
          leader_winptr->wm_client_machine.value != NULL &&
          leader_winptr->wm_client_machine.nitems != 0)
      {
          leader_winptr->has_save_yourself =
            HasSaveYourself (leader_winptr->window);

          ConnectClientToSM (leader_winptr);
      }
    }

    XSync (disp, 0);
    XSetErrorHandler (NULL);

    if (caught_error)
    {
      caught_error = 0;
      RemoveWindow (leader_winptr);
    }
}



void
HandleCreate (event)

XCreateWindowEvent *event;

{
    Atom actual_type;
    int actual_format;
    unsigned long nitems, bytesafter;
    unsigned long *datap = NULL;
    WinInfo *winptr;
    Bool got_wm_state = 0;

    /*
     * We are waiting for all proxy connections to close so we can die.
     * Don't handle new connections.
     */

    if (ok_to_die)
      return;


    /*
     * Add the new window
     */

    if ((winptr = AddNewWindow (event->window)) == NULL)
      return;


    /*
     * Right after the window was created, it might have been destroyed,
     * so the following Xlib calls might fail.  Need to catch the error
     * by installing an error handler.
     */

    caught_error = 0;
    XSetErrorHandler (MyErrorHandler);


    /*
     * Select for Property Notify on the window so we can determine
     * when WM_STATE is defined.  To avoid a race condition, we must
     * do this _before_ we check for WM_STATE right now.
     *
     * Select for Substructure Notify so we can determine when the
     * window is destroyed.
     */

    XSelectInput (disp, event->window,
      SubstructureNotifyMask | PropertyChangeMask);   


    /*
     * WM_STATE may already be there.  Check now.
     */

    if (XGetWindowProperty (disp, event->window, wmStateAtom,
      0L, 2L, False, AnyPropertyType,
      &actual_type, &actual_format, &nitems, &bytesafter,
      (unsigned char **) &datap) == Success && datap)
    {
      if (nitems > 0)
          got_wm_state = 1;

      if (datap)
          XFree ((char *) datap);
    }

    XSync (disp, 0);
    XSetErrorHandler (NULL);

    if (caught_error)
    {
      caught_error = 0;
      RemoveWindow (winptr);
    }
    else if (got_wm_state)
    {
      Got_WM_STATE (winptr);
    }
}



void
HandleDestroy (event)

XDestroyWindowEvent *event;

{
    WinInfo *winptr;

    if (LookupWindow (event->window, &winptr, NULL))
    {
      if (winptr->smc_conn)
      {
          SmcCloseConnection (winptr->smc_conn, 0, NULL);
          XtRemoveInput (winptr->input_id);
          proxy_count--;
      }

      if (debug)
      {
          printf ("Removed window (window = 0x%x)\n", 
                (unsigned int)winptr->window);
          printf ("\n");
      }

      RemoveWindow (winptr);
    }
}



void
HandleUpdate (event)

XPropertyEvent *event;

{
    Window window = event->window;
    WinInfo *winptr;

    if (!LookupWindow (window, &winptr, NULL))
      return;

    if (event->atom == wmStateAtom)
    {
      Got_WM_STATE (winptr);
    }
    else if (event->atom == XA_WM_COMMAND && winptr->waiting_for_update)
    {
      /* Finish off the Save Yourself */

      if (winptr->wm_command)
      {
          XFreeStringList (winptr->wm_command);
          winptr->wm_command = NULL;
          winptr->wm_command_count = 0;
      }

      XGetCommand (disp, window,
          &winptr->wm_command,
          &winptr->wm_command_count);

      winptr->waiting_for_update = 0;
      FinishSaveYourself (winptr, True);
    }
}



void
ProxySaveYourselfPhase2CB (smcConn, clientData)

SmcConn smcConn;
SmPointer clientData;

{
    char *filename;
    Bool success = True;
    SmProp prop1, prop2, prop3, *props[3];
    SmPropValue prop1val, prop2val, prop3val;
    char discardCommand[80];
    int numVals, i;
    static int first_time = 1;

    if (first_time)
    {
      char userId[20];
      char hint = SmRestartIfRunning;

      prop1.name = SmProgram;
      prop1.type = SmARRAY8;
      prop1.num_vals = 1;
      prop1.vals = &prop1val;
      prop1val.value = Argv[0];
      prop1val.length = strlen (Argv[0]);

      sprintf (userId, "%ld", (long)getuid());
      prop2.name = SmUserID;
      prop2.type = SmARRAY8;
      prop2.num_vals = 1;
      prop2.vals = &prop2val;
      prop2val.value = (SmPointer) userId;
      prop2val.length = strlen (userId);
      
      prop3.name = SmRestartStyleHint;
      prop3.type = SmCARD8;
      prop3.num_vals = 1;
      prop3.vals = &prop3val;
      prop3val.value = (SmPointer) &hint;
      prop3val.length = 1;
      
      props[0] = &prop1;
      props[1] = &prop2;
      props[2] = &prop3;

      SmcSetProperties (smcConn, 3, props);

      first_time = 0;
    }

    if ((filename = WriteProxyFile ()) == NULL)
    {
      success = False;
      goto finishUp;
    }

    prop1.name = SmRestartCommand;
    prop1.type = SmLISTofARRAY8;

    prop1.vals = (SmPropValue *) malloc (
      (Argc + 4) * sizeof (SmPropValue));

    if (!prop1.vals)
    {
      success = False;
      goto finishUp;
    }

    numVals = 0;

    for (i = 0; i < Argc; i++)
    {
      if (strcmp (Argv[i], "-clientId") == 0 ||
          strcmp (Argv[i], "-restore") == 0)
      {
          i++;
      }
      else
      {
          prop1.vals[numVals].value = (SmPointer) Argv[i];
          prop1.vals[numVals++].length = strlen (Argv[i]);
      }
    }

    prop1.vals[numVals].value = (SmPointer) "-clientId";
    prop1.vals[numVals++].length = 9;

    prop1.vals[numVals].value = (SmPointer) proxy_clientId;
    prop1.vals[numVals++].length = strlen (proxy_clientId);

    prop1.vals[numVals].value = (SmPointer) "-restore";
    prop1.vals[numVals++].length = 8;

    prop1.vals[numVals].value = (SmPointer) filename;
    prop1.vals[numVals++].length = strlen (filename);

    prop1.num_vals = numVals;


    sprintf (discardCommand, "rm %s", filename);
    prop2.name = SmDiscardCommand;
    prop2.type = SmARRAY8;
    prop2.num_vals = 1;
    prop2.vals = &prop2val;
    prop2val.value = (SmPointer) discardCommand;
    prop2val.length = strlen (discardCommand);

    props[0] = &prop1;
    props[1] = &prop2;

    SmcSetProperties (smcConn, 2, props);
    free ((char *) prop1.vals);

 finishUp:

    SmcSaveYourselfDone (smcConn, success);
    sent_save_done = 1;

    if (filename)
      free (filename);
}



void
ProxySaveYourselfCB (smcConn, clientData, saveType,
    shutdown, interactStyle, fast)

SmcConn smcConn;
SmPointer clientData;
int saveType;
Bool shutdown;
int interactStyle;
Bool fast;

{
    /*
     * We want the proxy to respond to the Save Yourself after all
     * the regular XSMP clients have finished with the save (and possibly
     * interacted with the user).
     */

    if (!SmcRequestSaveYourselfPhase2 (smcConn,
      ProxySaveYourselfPhase2CB, NULL))
    {
      SmcSaveYourselfDone (smcConn, False);
      sent_save_done = 1;
    }
    else
      sent_save_done = 0;
}



void
ProxyDieCB (smcConn, clientData)

SmcConn smcConn;
SmPointer clientData;

{
    SmcCloseConnection (proxy_smcConn, 0, NULL);
    XtRemoveInput (proxy_iceInputId);

    if (die_count == proxy_count)
      exit (0);
    else
      ok_to_die = 1;
}



void
ProxySaveCompleteCB (smcConn, clientData)

SmcConn smcConn;
SmPointer clientData;

{
    ;
}



void
ProxyShutdownCancelledCB (smcConn, clientData)

SmcConn smcConn;
SmPointer clientData;

{
    if (!sent_save_done)
    {
      SmcSaveYourselfDone (smcConn, False);
      sent_save_done = 1;
    }
}



Status
ConnectProxyToSM (previous_id)

char *previous_id;

{
    char errorMsg[256];
    unsigned long mask;
    SmcCallbacks callbacks;
    IceConn iceConn;

    mask = SmcSaveYourselfProcMask | SmcDieProcMask |
      SmcSaveCompleteProcMask | SmcShutdownCancelledProcMask;

    callbacks.save_yourself.callback = ProxySaveYourselfCB;
    callbacks.save_yourself.client_data = (SmPointer) NULL;

    callbacks.die.callback = ProxyDieCB;
    callbacks.die.client_data = (SmPointer) NULL;

    callbacks.save_complete.callback = ProxySaveCompleteCB;
    callbacks.save_complete.client_data = (SmPointer) NULL;

    callbacks.shutdown_cancelled.callback = ProxyShutdownCancelledCB;
    callbacks.shutdown_cancelled.client_data = (SmPointer) NULL;

    proxy_smcConn = SmcOpenConnection (
      NULL,                   /* use SESSION_MANAGER env */
      (SmPointer) appContext,
      SmProtoMajor,
      SmProtoMinor,
      mask,
      &callbacks,
      previous_id,
      &proxy_clientId,
      256, errorMsg);

    if (proxy_smcConn == NULL)
      return (0);

    iceConn = SmcGetIceConnection (proxy_smcConn);

    proxy_iceInputId = XtAppAddInput (
          appContext,
          IceConnectionNumber (iceConn),
            (XtPointer) XtInputReadMask,
          ProcessIceMsgProc,
          (XtPointer) iceConn);

    return (1);
}



void
CheckForExistingWindows (root)

Window root;

{
    Window dontCare1, dontCare2, *children, client_window;
    unsigned int nchildren, i;
    XCreateWindowEvent event;

    /*
     * We query the root tree for all windows created thus far.
     * Note that at any moment after XQueryTree is called, a
     * window may be deleted.  So we must take extra care to make
     * sure a window really exists.
     */

    XQueryTree (disp, root, &dontCare1, &dontCare2, &children, &nchildren);

    for (i = 0; i < nchildren; i++)
    {
      event.window = children[i];

      HandleCreate (&event);

      caught_error = 0;
      XSetErrorHandler (MyErrorHandler);

      client_window = XmuClientWindow (disp, children[i]);

      XSetErrorHandler (NULL);

      if (!caught_error && client_window != children[i])
      {
          event.window = client_window;
          HandleCreate (&event);
      }
    }
}



int
main (int argc, char *argv[])
{
    char *restore_filename = NULL;
    char *client_id = NULL;
    int i, zero = 0;

    Argc = argc;
    Argv = argv;

    for (i = 1; i < argc; i++)
    {
      if (argv[i][0] == '-')
      {
          switch (argv[i][1])
          {
            case 'd':                     /* -debug */
            debug = 1;
            continue;

            case 'c':                     /* -clientId */
            if (++i >= argc) goto usage;
            client_id = argv[i];
            continue;

            case 'r':                     /* -restore */
            if (++i >= argc) goto usage;
            restore_filename = argv[i];
            continue;
          }
      }

    usage:

      fprintf (stderr,
          "usage:  %s [-clientId id] [-restore file] [-debug]\n", argv[0]);
      exit (1);
    }


    XtToolkitInitialize ();
    appContext = XtCreateApplicationContext ();

    if (!(disp = XtOpenDisplay (appContext, NULL, "SM-PROXY", "SM-PROXY",
      NULL, 0, &zero, NULL)))
    {
      fprintf (stderr, "smproxy: unable to open display\n");
      exit (1);
    }

    if (restore_filename)
      ReadProxyFile (restore_filename);

    if (!ConnectProxyToSM (client_id))
    {
      fprintf (stderr, "smproxy: unable to connect to session manager\n");
      exit (1);
    }

    wmProtocolsAtom = XInternAtom (disp, "WM_PROTOCOLS", False);
    wmSaveYourselfAtom = XInternAtom (disp, "WM_SAVE_YOURSELF", False);
    wmStateAtom = XInternAtom (disp, "WM_STATE", False);
    smClientIdAtom = XInternAtom (disp, "SM_CLIENT_ID", False);
    wmClientLeaderAtom = XInternAtom (disp, "WM_CLIENT_LEADER", False);

    for (i = 0; i < ScreenCount (disp); i++)
    {
      Window root = RootWindow (disp, i);
      XSelectInput (disp, root, SubstructureNotifyMask | PropertyChangeMask);
      CheckForExistingWindows (root);
    }

    while (1)
    {
      XEvent event;

      XtAppNextEvent (appContext, &event);

      switch (event.type)
      {
      case CreateNotify:
          HandleCreate (&event.xcreatewindow);
          break;

      case DestroyNotify:
          HandleDestroy (&event.xdestroywindow);
          break;

      case PropertyNotify:
          HandleUpdate (&event.xproperty);
          break;

      default:
          XtDispatchEvent (&event);
          break;
      }
    }
    exit(0);
}

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