diff options
Diffstat (limited to 'libXmu/src/CloseHook.c')
| -rw-r--r-- | libXmu/src/CloseHook.c | 588 |
1 files changed, 294 insertions, 294 deletions
diff --git a/libXmu/src/CloseHook.c b/libXmu/src/CloseHook.c index aeefad2bb..ca9d9def6 100644 --- a/libXmu/src/CloseHook.c +++ b/libXmu/src/CloseHook.c @@ -1,294 +1,294 @@ -/*
-Copyright 1989, 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.
-
-*/
-
-/*
- * CloseDisplayHook package - provide callback on XCloseDisplay
- *
- * *
- * Author: Jim Fulton, MIT X Consortium
- *
- *
- * Public Entry Points
- *
- * CloseHook XmuAddCloseDisplayHook (dpy, func, arg)
- * Display *dpy;
- * XmuCloseHookProc func;
- * XPointer arg;
- *
- * Bool XmuRemoveCloseDisplayHook (dpy, hook, func, arg)
- * Display *dpy;
- * CloseHook hook;
- * XmuCloseHookProc func;
- * XPointer arg;
- *
- * Bool XmuLookupCloseDisplayHook (dpy, hook, func, arg)
- * Display *dpy;
- * CloseHook hook;
- * XmuCloseHookProc func;
- * XPointer arg;
- *
- */
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-#include <stdio.h> /* for NULL */
-#include <X11/Xos.h>
-#include <X11/Xlib.h>
-#include <X11/Xmu/CloseHook.h>
-#include <stdlib.h>
-
-/*
- * Private data
- *
- * This is a list of display entries, each of which contains a list of callback
- * records.
- */
-
-typedef struct _CallbackRec {
- struct _CallbackRec *next; /* next link in chain */
- XmuCloseHookProc func; /* function to call */
- XPointer arg; /* argument to pass with function */
-} CallbackRec;
-
-
-typedef struct _DisplayEntry {
- struct _DisplayEntry *next; /* next link in chain */
- Display *dpy; /* the display this represents */
- int extension; /* from XAddExtension */
- struct _CallbackRec *start, *end; /* linked list of callbacks */
- struct _CallbackRec *calling; /* currently being called back */
-} DisplayEntry;
-
-/*
- * Prototypes
- */
-static DisplayEntry *_FindDisplayEntry(Display*, DisplayEntry**);
-static Bool _MakeExtension(Display*, int*);
-
-static DisplayEntry *elist = NULL;
-
-
-/*
- *****************************************************************************
- * Public Entry Points *
- *****************************************************************************
- */
-
-/*
- * Add - add a callback for the given display. When the display is closed,
- * the given function will be called as:
- *
- * (*func) (dpy, arg)
- *
- * This function is declared to return an int even though the value is ignored
- * because some compilers have problems with functions returning void.
- *
- * This routine returns NULL if it was unable to add the callback, otherwise
- * it returns an untyped pointer that can be used with Remove or Lookup, but
- * not dereferenced.
- */
-CloseHook
-XmuAddCloseDisplayHook(Display *dpy, XmuCloseHookProc func, XPointer arg)
-{
- 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);
-}
-
-
-/*
- * Remove - get rid of a callback. If handle is non-null, use that to compare
- * entries. Otherwise, remove first instance of the function/argument pair.
- */
-Bool
-XmuRemoveCloseDisplayHook(Display *dpy, CloseHook handle,
- XmuCloseHookProc func, XPointer arg)
-{
- 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;
-}
-
-
-/*
- * Lookup - see whether or not a handle has been installed. If handle is
- * non-NULL, look for an entry that matches it; otherwise look for an entry
- * with the same function/argument pair.
- */
-Bool
-XmuLookupCloseDisplayHook(Display *dpy, CloseHook handle,
- XmuCloseHookProc func, XPointer arg)
-{
- 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);
-}
-
-
-/*
- *****************************************************************************
- * internal routines *
- *****************************************************************************
- */
-
-
-/*
- * Find the specified display on the linked list of displays. Also return
- * the preceeding link so that the display can be unlinked without having
- * back pointers.
- */
-static DisplayEntry *
-_FindDisplayEntry(register Display *dpy, DisplayEntry **prevp)
-{
- register DisplayEntry *d, *prev;
-
- for (d = elist, prev = NULL; d; d = d->next) {
- if (d->dpy == dpy) {
- if (prevp) *prevp = prev;
- return d;
- }
- prev = d;
- }
- return NULL;
-}
-
-
-
-/*
- * _DoCallbacks - process all of the callbacks for this display and free
- * the associated callback data (callback records and display entries).
- */
-/* ARGSUSED */
-static int
-_DoCallbacks(Display *dpy, XExtCodes *codes)
-{
- register CallbackRec *h;
- DisplayEntry *prev;
- DisplayEntry *de = _FindDisplayEntry (dpy, &prev);
-
- if (!de) return 0;
-
- /* walk the list doing the callbacks and freeing callback record */
- for (h = de->start; h;) {
- register CallbackRec *nexth = h->next;
- de->calling = h; /* let remove know we'll free it */
- (*(h->func)) (dpy, h->arg);
- de->calling = NULL;
- free ((char *) h);
- h = nexth;
- }
-
- /* unlink this display from chain */
- if (elist == de) {
- elist = de->next;
- } else {
- prev->next = de->next;
- }
- free ((char *) de);
- return 1;
-}
-
-
-/*
- * _MakeExtension - create an extension for this display; done once per display
- */
-static Bool
-_MakeExtension(Display *dpy, int *extensionp)
-{
- XExtCodes *codes;
-
- codes = XAddExtension (dpy);
- if (!codes) return False;
-
- (void) XESetCloseDisplay (dpy, codes->extension, _DoCallbacks);
-
- *extensionp = codes->extension;
- return True;
-}
+/* +Copyright 1989, 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. + +*/ + +/* + * CloseDisplayHook package - provide callback on XCloseDisplay + * + * * + * Author: Jim Fulton, MIT X Consortium + * + * + * Public Entry Points + * + * CloseHook XmuAddCloseDisplayHook (dpy, func, arg) + * Display *dpy; + * XmuCloseHookProc func; + * XPointer arg; + * + * Bool XmuRemoveCloseDisplayHook (dpy, hook, func, arg) + * Display *dpy; + * CloseHook hook; + * XmuCloseHookProc func; + * XPointer arg; + * + * Bool XmuLookupCloseDisplayHook (dpy, hook, func, arg) + * Display *dpy; + * CloseHook hook; + * XmuCloseHookProc func; + * XPointer arg; + * + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif +#include <stdio.h> /* for NULL */ +#include <X11/Xos.h> +#include <X11/Xlib.h> +#include <X11/Xmu/CloseHook.h> +#include <stdlib.h> + +/* + * Private data + * + * This is a list of display entries, each of which contains a list of callback + * records. + */ + +typedef struct _CallbackRec { + struct _CallbackRec *next; /* next link in chain */ + XmuCloseHookProc func; /* function to call */ + XPointer arg; /* argument to pass with function */ +} CallbackRec; + + +typedef struct _DisplayEntry { + struct _DisplayEntry *next; /* next link in chain */ + Display *dpy; /* the display this represents */ + int extension; /* from XAddExtension */ + struct _CallbackRec *start, *end; /* linked list of callbacks */ + struct _CallbackRec *calling; /* currently being called back */ +} DisplayEntry; + +/* + * Prototypes + */ +static DisplayEntry *_FindDisplayEntry(Display*, DisplayEntry**); +static Bool _MakeExtension(Display*, int*); + +static DisplayEntry *elist = NULL; + + +/* + ***************************************************************************** + * Public Entry Points * + ***************************************************************************** + */ + +/* + * Add - add a callback for the given display. When the display is closed, + * the given function will be called as: + * + * (*func) (dpy, arg) + * + * This function is declared to return an int even though the value is ignored + * because some compilers have problems with functions returning void. + * + * This routine returns NULL if it was unable to add the callback, otherwise + * it returns an untyped pointer that can be used with Remove or Lookup, but + * not dereferenced. + */ +CloseHook +XmuAddCloseDisplayHook(Display *dpy, XmuCloseHookProc func, XPointer arg) +{ + 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); +} + + +/* + * Remove - get rid of a callback. If handle is non-null, use that to compare + * entries. Otherwise, remove first instance of the function/argument pair. + */ +Bool +XmuRemoveCloseDisplayHook(Display *dpy, CloseHook handle, + XmuCloseHookProc func, XPointer arg) +{ + 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; +} + + +/* + * Lookup - see whether or not a handle has been installed. If handle is + * non-NULL, look for an entry that matches it; otherwise look for an entry + * with the same function/argument pair. + */ +Bool +XmuLookupCloseDisplayHook(Display *dpy, CloseHook handle, + XmuCloseHookProc func, XPointer arg) +{ + 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); +} + + +/* + ***************************************************************************** + * internal routines * + ***************************************************************************** + */ + + +/* + * Find the specified display on the linked list of displays. Also return + * the preceeding link so that the display can be unlinked without having + * back pointers. + */ +static DisplayEntry * +_FindDisplayEntry(register Display *dpy, DisplayEntry **prevp) +{ + register DisplayEntry *d, *prev; + + for (d = elist, prev = NULL; d; d = d->next) { + if (d->dpy == dpy) { + if (prevp) *prevp = prev; + return d; + } + prev = d; + } + return NULL; +} + + + +/* + * _DoCallbacks - process all of the callbacks for this display and free + * the associated callback data (callback records and display entries). + */ +/* ARGSUSED */ +static int +_DoCallbacks(Display *dpy, XExtCodes *codes) +{ + register CallbackRec *h; + DisplayEntry *prev; + DisplayEntry *de = _FindDisplayEntry (dpy, &prev); + + if (!de) return 0; + + /* walk the list doing the callbacks and freeing callback record */ + for (h = de->start; h;) { + register CallbackRec *nexth = h->next; + de->calling = h; /* let remove know we'll free it */ + (*(h->func)) (dpy, h->arg); + de->calling = NULL; + free ((char *) h); + h = nexth; + } + + /* unlink this display from chain */ + if (elist == de) { + elist = de->next; + } else { + prev->next = de->next; + } + free ((char *) de); + return 1; +} + + +/* + * _MakeExtension - create an extension for this display; done once per display + */ +static Bool +_MakeExtension(Display *dpy, int *extensionp) +{ + XExtCodes *codes; + + codes = XAddExtension (dpy); + if (!codes) return False; + + (void) XESetCloseDisplay (dpy, codes->extension, _DoCallbacks); + + *extensionp = codes->extension; + return True; +} |