CODEWITHSUNDEEP
clinuxx11xlib
Cloud89
Cloud89

Reputation: 75

Can't find definition of XMapWindow() in Xlib headers

I have this simple code that draws a small window using X11:

int main(int, char*[])
{
    Display* display = XOpenDisplay(NULL);
    Window window = XCreateSimpleWindow(
        display, XDefaultRootWindow(display),
        100, 100, 200, 200, 4, 0, 0);
    XEvent event;

    XMapWindow(display, window);
    XSelectInput(display, window, KeyPressMask | ButtonPressMask | ExposureMask);

    while (True) {
      XNextEvent(display, &event);
    }

    return 0;
}

Everything works fine, the window is drawn without problems.

The thing is I really want to understand how X11 works so I'm reading the source code of the headers but I'm unable to find the definition for XMapWindow() - I need help.

This was the only similutede I could find in the Xlib.h header file.

extern int XMapWindow(
    Display*        /* display */,
    Window      /* w */
);

Upvotes: 0

Views: 150

Answers (1)

Blabbo the Verbose
Blabbo the Verbose

Reputation: 236

You can find the implementation of XMapWindow() in the libX11 sources, specifically in src/MapWindow.c:XMapWindow().

It boils down to some locking, and a _XGetRequest(dpy, X_MapWindow, SIZEOF(xResourceReq)) call. That is defined in src/XlibInt.c:_XGetRequest(), and as you can guess by the name, adds the X_MapWindow request to the request queue sent to the X server.

How the X server (which manages the actual display) acts on that, is up to that X server implementation.

Upvotes: 1

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