CloseHook.h File Reference

#include <X11/Xlib.h>
#include <X11/Xfuncproto.h>
#include <X11/Xlibint.h>

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Typedefs
typedef XPointer	CloseHook
typedef int(*)	XmuCloseHookProc (Display *dpy, XPointer data)
Functions
_XFUNCPROTOBEGIN CloseHook	XmuAddCloseDisplayHook (Display *dpy, XmuCloseHookProc proc, XPointer arg)
Bool	XmuLookupCloseDisplayHook (Display *dpy, CloseHook handle, XmuCloseHookProc proc, XPointer arg)
Bool	XmuRemoveCloseDisplayHook (Display *dpy, CloseHook handle, XmuCloseHookProc proc, XPointer arg)

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Typedef Documentation

typedef XPointer CloseHook

Definition at line 42 of file CloseHook.h.

typedef int(*) XmuCloseHookProc(Display *dpy, XPointer data)

Definition at line 44 of file CloseHook.h.

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Function Documentation

_XFUNCPROTOBEGIN CloseHook XmuAddCloseDisplayHook	(	Display *	dpy,
		XmuCloseHookProc	proc,
		XPointer	arg
	)

Definition at line 114 of file CloseHook.c.

References _FindDisplayEntry(), _MakeExtension(), _CallbackRec::arg, _DisplayEntry::calling, _DisplayEntry::dpy, elist, _DisplayEntry::end, _DisplayEntry::extension, free(), _CallbackRec::func, malloc(), _CallbackRec::next, _DisplayEntry::next, NULL, and _DisplayEntry::start.

Referenced by XmuDQAddDisplay().

{
    DisplayEntry *de;
    CallbackRec *cb;

    /* allocate ahead of time so that we can fail atomically */
    cb = (CallbackRec *) malloc (sizeof (CallbackRec));
    if (!cb) return ((XPointer) NULL);

    de = _FindDisplayEntry (dpy, NULL);
    if (!de) {
        if ((de = (DisplayEntry *) malloc (sizeof (DisplayEntry))) == NULL ||
            !_MakeExtension (dpy, &de->extension)) {
            free ((char *) cb);
            if (de) free ((char *) de);
            return ((CloseHook) NULL);
        }
        de->dpy = dpy;
        de->start = de->end = NULL;
        de->calling = NULL;
        de->next = elist;
        elist = de;
    }

    /* add to end of list of callback recordss */
    cb->func = func;
    cb->arg = arg;
    cb->next = NULL;
    if (de->end) {
        de->end->next = cb;
    } else {
        de->start = cb;
    }
    de->end = cb;

    return ((CloseHook) cb);
}

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Bool XmuLookupCloseDisplayHook	(	Display *	dpy,
		CloseHook	handle,
		XmuCloseHookProc	proc,
		XPointer	arg
	)

Definition at line 196 of file CloseHook.c.

References _FindDisplayEntry(), h, NULL, and _DisplayEntry::start.

{
    DisplayEntry *de = _FindDisplayEntry (dpy, NULL);
    register CallbackRec *h;

    if (!de) return False;

    for (h = de->start; h; h = h->next) {
        if (handle) {
            if (h == (CallbackRec *) handle) break;
        } else {
            if (h->func == func && h->arg == arg) break;
        }
    }
    return (h ? True : False);
}

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Bool XmuRemoveCloseDisplayHook	(	Display *	dpy,
		CloseHook	handle,
		XmuCloseHookProc	proc,
		XPointer	arg
	)

Definition at line 158 of file CloseHook.c.

References _FindDisplayEntry(), _DisplayEntry::calling, _DisplayEntry::end, free(), h, _CallbackRec::next, NULL, and _DisplayEntry::start.

Referenced by XmuDQRemoveDisplay().

{
    DisplayEntry *de = _FindDisplayEntry (dpy, NULL);
    register CallbackRec *h, *prev;

    if (!de) return False;

    /* look for handle or function/argument pair */
    for (h = de->start, prev = NULL; h; h = h->next) {
        if (handle) {
            if (h == (CallbackRec *) handle) break;
        } else {
            if (h->func == func && h->arg == arg) break;
        }
        prev = h;
    }
    if (!h) return False;


    /* remove from list, watch head and tail */
    if (de->start == h) {
        de->start = h->next;
    } else {
        prev->next = h->next;
    }
    if (de->end == h) de->end = prev;
    if (de->calling != h) free ((char *) h);
    return True;
}

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