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/* Cleanups.
Copyright (C) 1986, 1988-2005, 2007-2012 Free Software Foundation, Inc.
This file is part of GDB.
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; either version 3 of the License, or
(at your option) any later version.
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, see <http://www.gnu.org/licenses/>. */
#ifndef CLEANUPS_H
#define CLEANUPS_H
/* The cleanup list records things that have to be undone
if an error happens (descriptors to be closed, memory to be freed, etc.)
Each link in the chain records a function to call and an
argument to give it.
Use make_cleanup to add an element to the cleanup chain.
Use do_cleanups to do all cleanup actions back to a given
point in the chain. Use discard_cleanups to remove cleanups
from the chain back to a given point, not doing them.
If the argument is pointer to allocated memory, then you need
to additionally set the 'free_arg' member to a function that will
free that memory. This function will be called both when the cleanup
is executed and when it's discarded. */
struct cleanup
{
struct cleanup *next;
void (*function) (void *);
void (*free_arg) (void *);
void *arg;
};
/* NOTE: cagney/2000-03-04: This typedef is strictly for the
make_cleanup function declarations below. Do not use this typedef
as a cast when passing functions into the make_cleanup() code.
Instead either use a bounce function or add a wrapper function.
Calling a f(char*) function with f(void*) is non-portable. */
typedef void (make_cleanup_ftype) (void *);
/* WARNING: The result of the "make cleanup" routines is not the intuitive
choice of being a handle on the just-created cleanup. Instead it is an
opaque handle of the cleanup mechanism and represents all cleanups created
from that point onwards. */
extern struct cleanup *make_cleanup (make_cleanup_ftype *, void *);
extern struct cleanup *make_cleanup_dtor (make_cleanup_ftype *, void *,
void (*dtor) (void *));
extern struct cleanup *make_final_cleanup (make_cleanup_ftype *, void *);
/* A special value to pass to do_cleanups and do_final_cleanups
to tell them to do all cleanups. */
#define ALL_CLEANUPS ((struct cleanup *)0)
extern void do_cleanups (struct cleanup *);
extern void do_final_cleanups (struct cleanup *);
extern void discard_cleanups (struct cleanup *);
extern void discard_final_cleanups (struct cleanup *);
extern struct cleanup *save_cleanups (void);
extern struct cleanup *save_final_cleanups (void);
extern void restore_cleanups (struct cleanup *);
extern void restore_final_cleanups (struct cleanup *);
/* A no-op cleanup.
This is useful when you want to establish a known reference point
to pass to do_cleanups. */
extern void null_cleanup (void *);
#endif /* CLEANUPS_H */
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