Conference bulova::decw_jan-89_to_nov-90

2487.0. "SERVER CRASH WITH A VERY SIMPLE (BUGGY) PROGRAM" by MLNEDU::FERRARA (Giancarlo - Customer Trng ITALY) Wed Mar 21 1990 12:04

    AAAARRRRRGGGGHHHH!
    
    The customer in 2483.* is TERRIBLE!!!!
    
    Here follows her SECOND xlib program!
    
    She attempts to create an A4-size window.
    
    THE CODE IS WRONG (not casting dimension to int) BUT THIS SIMPLE
    CODE ****CRASH**** the server!!!!
    
    VMS 5.1/DECwindows 1.0/VS2000 bw 19"
    VMS 5.2-1/DECwindows 1.0/GPX with color 19"
    
    I don't include the server error log bvecause i suspect it's quite
    easy to obtain one....just run the program. (REGION BAD BOX... and
    after exceding maximun internal server error)
    
    It's already know as bug & is corrected in decw 2.0?????
    
    -------- Crash.c -------------------------------
#include <stdio.h>
#include <Xlib.h>

#define screenNumber      DefaultScreen(display)
#define rootWindow        RootWindow(display,screenNumber)
#define displayWidth      DisplayWidth(display,screenNumber)
#define displayHeight     DisplayHeight(display,screenNumber)
#define displayWidthMM    DisplayWidthMM(display,screenNumber)
#define displayHeightMM   DisplayHeightMM(display,screenNumber)
#define blackPixel        BlackPixel(display,screenNumber)
#define whitePixel        WhitePixel(display,screenNumber)
#define windowX           (displayWidth/3)
#define windowY           (displayHeight/3)
#define windowWidth       (displayWidth*210.0/displayWidthMM)
#define windowHeight      (displayHeight*297.0/displayHeightMM)
#define borderWidth       1

main(argc, argv)
    unsigned int argc;
    char *argv[];
{
    Display *display;                   /* pointer to display information */
    Window window;                      /* application window id */

    /* Open the default display */

    if (!(display = XOpenDisplay(NULL))) {
        fprintf(stderr, "Can't open display\n");
        exit(0);
    }

    /* Create a simple window on the screen */

    window = XCreateSimpleWindow(display, 
                                        /* pointer to display info */
      rootWindow,                       /* parent window id */
      windowX,                          /* x offset from parent origin */
      windowY,                          /* y offset from parent origin */
      windowWidth,                      /* width */
      windowHeight,                     /* height */
      borderWidth,                      /* border width */
      blackPixel,                       /* border color */
      whitePixel);                      /* background color */

    /* Map the window, causing it to become visible */

    XMapWindow(display, window);

    /* Wait for something to happen */

    while (1) {
        XEvent event;

        XNextEvent(display, &event);
        switch (event.type) {
            default: 
                ;
        }
    }
}
    

	I compiled and linked "crash.c" on a VMS V5.2 system
	and ran it with the display pointing to my VMS V5.3
	(DECwindows V2) workstation.  It resulted in a huge
	window with the upper left of its window manager
	(the DECwindows window manager) decorations at the
	lower right of the screen.  The server didn't crash.

	Dan

	p.s. After dragging the window partially onto the screen,
	the tool "xwininfo" described it as:

$ xwininfo

xwininfo ==> Please select the window about which you
         ==> would like information by clicking the
         ==> mouse in that window.

xwininfo ==> Window id: 0xe00001 (has no name)

         ==> Upper left X: -16943
         ==> Upper left Y: -16940
         ==> Width: 17691
         ==> Height: 23108
         ==> Depth: 8
         ==> Border width: 17755
         ==> Window class: InputOutput
         ==> Colormap: 0x80066
         ==> Window Bit Gravity State: ForgetGravity
         ==> Window Window Gravity State: NorthWestGravity
         ==> Window Backing Store State: NotUseful
         ==> Window Save Under State: no
         ==> Window Map State: IsViewable
         ==> Window Override Redirect State: no
         ==> Corners:  +-16943+-16940  --35234+-16940  --35234--40814 \
+-16943--40814

Thanks!

I have also monitored x wire requests between client & server using xliddy.
I am sure that also v1 xlib put on wire a "good" request.
("good" in sense of "as asked", i.e. a huge window).

This produce a crash on a v1 server, but according to your test this
problem is fixed in v2 server.

Giancarlo