Attachment 119156 Details for Bug 92652 – program that crashes x-server

program that crashes x-server

win_test.c (text/plain), 4.51 KB, created by avde on 2015-10-23 19:39:16 UTC

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Creator: avde

Created: 2015-10-23 19:39:16 UTC

Size: 4.51 KB

patch

obsolete

>#include <string.h>
>#include <stdlib.h>
>#include <stdio.h>
>#include <X11/Xlib.h>
>
>/* The window which contains the text. */
>
>struct {
>    int width;
>    int height;
>    char * text;
>    int text_len;
>
>    /* X Windows related variables. */
>
>    Display * display;
>    int screen;
>    Window root;
>    Window window;
>    GC gc;
>    XFontStruct * font;
>    unsigned long black_pixel;    
>    unsigned long white_pixel;
>}
>text_box;
>
>/* Connect to the display, set up the basic variables. */
>
>static void x_connect ()
>{
>    text_box.display = XOpenDisplay (NULL);
>    if (! text_box.display) {
>        fprintf (stderr, "Could not open display.\n");
>        exit (1);
>    }
>    text_box.screen = DefaultScreen (text_box.display);
>    text_box.root = RootWindow (text_box.display, text_box.screen);
>    text_box.black_pixel = BlackPixel (text_box.display, text_box.screen);
>    text_box.white_pixel = WhitePixel (text_box.display, text_box.screen);
>}
>
>/* Create the window. */
>
>static void create_window ()
>{
>    text_box.width = 300;
>    text_box.height = 300;
>    text_box.window = 
>        XCreateSimpleWindow (text_box.display,
>                             text_box.root,
>                             1, /* x */
>                             1, /* y */
>                             text_box.width,
>                             text_box.height,
>                             0, /* border width */
>                             text_box.black_pixel, /* border pixel */
>                             text_box.white_pixel  /* background */);
>
>    /* We don't need to select the events here. */
>
>    XSelectInput (text_box.display, text_box.window,
>                  ExposureMask);
>    XMapWindow (text_box.display, text_box.window);
>}
>
>/* Set up the GC (Graphics Context). */
>
>static void set_up_gc ()
>{
>    text_box.screen = DefaultScreen (text_box.display);
>    text_box.gc = XCreateGC (text_box.display, text_box.window, 0, 0);
>    XSetBackground (text_box.display, text_box.gc, text_box.white_pixel); 
>    XSetForeground (text_box.display, text_box.gc, text_box.black_pixel); 
>}
>
>/* Set up the text font. */
>
>static void set_up_font ()
>{
>    const char * fontname = "-*-helvetica-*-r-*-*-14-*-*-*-*-*-*-*";
>    text_box.font = XLoadQueryFont (text_box.display, fontname);
>    /* If the font could not be loaded, revert to the "fixed" font. */
>    if (! text_box.font) {
>        fprintf (stderr, "unable to load font %s: using fixed\n", fontname);
>        text_box.font = XLoadQueryFont (text_box.display, "fixed");
>    }
>    XSetFont (text_box.display, text_box.gc, text_box.font->fid);
>}
>
>/* Draw the window. */
>
>static void draw_screen ()
>{
>    int x;
>    int y;
>    int direction;
>    int ascent;
>    int descent;
>    XCharStruct overall;
>
>    /* Centre the text in the middle of the box. */
>
>    XTextExtents (text_box.font, text_box.text, text_box.text_len,
>                  & direction, & ascent, & descent, & overall);
>    x = (text_box.width - overall.width) / 2;
>    y = text_box.height / 2 + (ascent - descent) / 2;
>    XClearWindow (text_box.display, text_box.window);
>    XDrawString (text_box.display, text_box.window, text_box.gc,
>                 x, y, text_box.text, text_box.text_len);
>}
>
>/* Loop over events. */
>
>static void event_loop ()
>{
>    /* "wm_delete_window" is the Atom which corresponds to the delete
>       window message sent by the window manager. */
>
>    Atom wm_delete_window;
>    wm_delete_window =
>        XInternAtom (text_box.display, "WM_DELETE_WINDOW", False);
>
>    /* Set up the window manager protocols. The third argument here is
>       meant to be an array, and the fourth argument is the size of
>       the array. */
>
>    XSetWMProtocols (text_box.display, text_box.window, &wm_delete_window, 1);
>
>    while (1) {
>        XEvent e;
>        XNextEvent (text_box.display, & e);
>        if (e.type == Expose) {
>            draw_screen ();
>        }
>
>        /* Deal with a client message from the window manager telling
>           us to delete the window. */
>
>        else if (e.type == ClientMessage) {
>            printf ("Closed by the window manager.\n");
>            if ((Atom)e.xclient.data.l[0] == wm_delete_window) {
>                break;
>            }
>        }
>    }
>
>    /* Close the connection to the display. This also deletes any
>       windows and other stuff which might have been created. */
>
>    XCloseDisplay (text_box.display);
>}
>
>int main (int argc, char ** argv)
>{
>    text_box.text = "Hello World";
>    text_box.text_len = strlen (text_box.text);
>    x_connect ();
>    create_window ();
>    set_up_gc ();
>    set_up_font ();
>    event_loop ();
>    return 0;
>}

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Attachments on bug 92652: 119156

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