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      1 /*	$NetBSD: hook.h,v 1.1 2021/09/30 01:26:07 yamaguchi Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2021 Internet Initiative Japan Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #ifndef _SYS_HOOK_H_
     30 #define _SYS_HOOK_H_
     31 
     32 #include <sys/mutex.h>
     33 
     34 #define HOOKNAMSIZ	128
     35 
     36 struct khook_list;
     37 struct hook_desc;
     38 
     39 typedef struct khook_list	khook_list_t;
     40 typedef struct hook_desc	khook_t;
     41 
     42 khook_list_t	*simplehook_create(int, const char *);
     43 void		 simplehook_destroy(khook_list_t *);
     44 int		 simplehook_dohooks(khook_list_t *);
     45 
     46 khook_t		*simplehook_establish(khook_list_t *,
     47 		    void (*)(void *), void *);
     48 void		 simplehook_disestablish(khook_list_t *,
     49 		    khook_t *, kmutex_t *);
     50 bool		 simplehook_has_hooks(khook_list_t *);
     51 
     52 #endif /* !_SYS_HOOK_H_ */
     53