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/* Hook for making the close() function extensible.
Copyright (C) 2009, 2010 Free Software Foundation, Inc.
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
Lesser 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 CLOSE_HOOK_H
#define CLOSE_HOOK_H
#ifdef __cplusplus
extern "C" {
#endif
/* Currently, this entire code is only needed for the handling of sockets
on native Windows platforms. */
#if WINDOWS_SOCKETS
/* An element of the list of close hooks.
The fields of this structure are considered private. */
struct close_hook
{
/* Doubly linked list. */
struct close_hook *private_next;
struct close_hook *private_prev;
/* Function that treats the types of FD that it knows about and calls
execute_close_hooks (FD, REMAINING_LIST) as a fallback. */
int (*private_fn) (int fd, const struct close_hook *remaining_list);
};
/* This type of function closes FD, applying special knowledge for the FD
types it knows about, and calls execute_close_hooks (FD, REMAINING_LIST)
for the other FD types. */
typedef int (*close_hook_fn) (int fd, const struct close_hook *remaining_list);
/* Execute the close hooks in REMAINING_LIST.
Return 0 or -1, like close() would do. */
extern int execute_close_hooks (int fd, const struct close_hook *remaining_list);
/* Execute all close hooks.
Return 0 or -1, like close() would do. */
extern int execute_all_close_hooks (int fd);
/* Add a function to the list of close hooks.
The LINK variable points to a piece of memory which is guaranteed to be
accessible until the corresponding call to unregister_close_hook. */
extern void register_close_hook (close_hook_fn hook, struct close_hook *link);
/* Removes a function from the list of close hooks. */
extern void unregister_close_hook (struct close_hook *link);
#endif
#ifdef __cplusplus
}
#endif
#endif /* CLOSE_HOOK_H */
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