73 lines
2.4 KiB
C
73 lines
2.4 KiB
C
/* Hook for making the close() function extensible.
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Copyright (C) 2009, 2010 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef CLOSE_HOOK_H
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#define CLOSE_HOOK_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Currently, this entire code is only needed for the handling of sockets
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on native Windows platforms. */
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#if WINDOWS_SOCKETS
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/* An element of the list of close hooks.
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The fields of this structure are considered private. */
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struct close_hook
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{
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/* Doubly linked list. */
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struct close_hook *private_next;
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struct close_hook *private_prev;
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/* Function that treats the types of FD that it knows about and calls
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execute_close_hooks (FD, REMAINING_LIST) as a fallback. */
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int (*private_fn) (int fd, const struct close_hook *remaining_list);
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};
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/* This type of function closes FD, applying special knowledge for the FD
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types it knows about, and calls execute_close_hooks (FD, REMAINING_LIST)
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for the other FD types. */
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typedef int (*close_hook_fn) (int fd, const struct close_hook *remaining_list);
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/* Execute the close hooks in REMAINING_LIST.
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Return 0 or -1, like close() would do. */
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extern int execute_close_hooks (int fd, const struct close_hook *remaining_list);
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/* Execute all close hooks.
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Return 0 or -1, like close() would do. */
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extern int execute_all_close_hooks (int fd);
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/* Add a function to the list of close hooks.
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The LINK variable points to a piece of memory which is guaranteed to be
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accessible until the corresponding call to unregister_close_hook. */
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extern void register_close_hook (close_hook_fn hook, struct close_hook *link);
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/* Removes a function from the list of close hooks. */
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extern void unregister_close_hook (struct close_hook *link);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* CLOSE_HOOK_H */
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