-// $Id: undo.c 1676 2004-08-19 15:02:57Z ensc $ --*- c -*--
-
-// Copyright (C) 2004 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
-//
-// This program is free software; you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation; version 2 of the License.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program; if not, write to the Free Software
-// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
-
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#include "undo.h"
-
-#include <lib_internal/util.h>
-#include <ensc_vector/vector.h>
-
-#include <stdlib.h>
-#include <unistd.h>
-#include <assert.h>
-
-struct FuncData
-{
- ExitFunction fn;
- void const * args;
-};
-
-struct Undo
-{
- pid_t pid_;
- struct Vector funcs;
-};
-
-
-static struct Undo undo_data = {
- .pid_ = -1
-};
-
-static void
-atexitHandler()
-{
- struct FuncData const * ptr;
-
- if (undo_data.pid_ != getpid())
- return; // skip 'exit()' from forked processes
-
- for (ptr=Vector_end(&undo_data.funcs);
- ptr!=Vector_begin(&undo_data.funcs);
- --ptr)
- (ptr[-1].fn)(ptr[-1].args);
-}
-
-void
-Undo_init()
-{
- if (undo_data.pid_!=-1) {
- WRITE_MSG(2, "Undo already initialized; internal error...\n");
- _exit(1);
- }
-
- undo_data.pid_ = getpid();
- Vector_init(&undo_data.funcs, sizeof(struct FuncData));
-
- atexit(&atexitHandler);
-}
-
-void
-Undo_addTask(ExitFunction fn, void const *args)
-{
- struct FuncData *tmp = Vector_pushback(&undo_data.funcs);
- assert(tmp!=0); // Vector_pushback never returns a null-pointer
-
- tmp->fn = fn;
- tmp->args = args;
-}
-
-void
-Undo_detach()
-{
- Vector_free(&undo_data.funcs);
- undo_data.pid_ = -1;
-}