The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/module.h

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    1 /*-
    2  * Copyright (c) 1997 Doug Rabson
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD$
   27  */
   28 
   29 #ifndef _SYS_MODULE_H_
   30 #define _SYS_MODULE_H_
   31 
   32 typedef enum modeventtype {
   33     MOD_LOAD,
   34     MOD_UNLOAD,
   35     MOD_SHUTDOWN
   36 } modeventtype_t;
   37 
   38 typedef struct module *module_t;
   39 
   40 typedef int (*modeventhand_t)(module_t mod, int /*modeventtype_t*/ what,
   41                               void *arg);
   42 
   43 /*
   44  * Struct for registering modules statically via SYSINIT.
   45  */
   46 typedef struct moduledata {
   47         char            *name;  /* module name */
   48         modeventhand_t  evhand; /* event handler */
   49         void            *priv;  /* extra data */
   50         void            *_file; /* private; used by linker */
   51 } moduledata_t;
   52 
   53 /*
   54  * A module can use this to report module specific data to
   55  * the user via kldstat(2).
   56  */
   57 typedef union modspecific {
   58     int         intval;
   59     u_int       uintval;
   60     long        longval;
   61     u_long      ulongval;
   62 } modspecific_t;
   63 
   64 #ifdef KERNEL
   65 
   66 #define DECLARE_MODULE(name, data, sub, order) \
   67 SYSINIT(name##module, sub, order, module_register_init, &data) \
   68 struct __hack
   69 
   70 void module_register_init(void *data);
   71 int module_register(const char *name, modeventhand_t callback, void *arg,
   72                     void *file);
   73 module_t module_lookupbyname(const char *name);
   74 module_t module_lookupbyid(int modid);
   75 void module_reference(module_t mod);
   76 void module_release(module_t mod);
   77 int module_unload(module_t mod);
   78 int module_getid(module_t mod);
   79 module_t module_getfnext(module_t mod);
   80 void module_setspecific(module_t mod, modspecific_t *datap);
   81 
   82 #ifdef MOD_DEBUG
   83 
   84 extern int mod_debug;
   85 #define MOD_DEBUG_REFS  1
   86 
   87 #define MOD_DPF(cat, args)                                      \
   88         do {                                                    \
   89                 if (mod_debug & MOD_DEBUG_##cat) printf args;   \
   90         } while (0)
   91 
   92 #else
   93 
   94 #define MOD_DPF(cat, args)
   95 
   96 #endif
   97 
   98 #endif /* KERNEL */
   99 
  100 #define MAXMODNAME      32
  101 
  102 struct module_stat {
  103     int         version;        /* set to sizeof(struct module_stat) */
  104     char        name[MAXMODNAME];
  105     int         refs;
  106     int         id;
  107     modspecific_t data;
  108 };
  109 
  110 #ifndef KERNEL
  111 
  112 #include <sys/cdefs.h>
  113 
  114 __BEGIN_DECLS
  115 int     modnext(int modid);
  116 int     modfnext(int modid);
  117 int     modstat(int modid, struct module_stat* stat);
  118 int     modfind(char *name);
  119 __END_DECLS
  120 
  121 #endif
  122 
  123 #endif  /* !_SYS_MODULE_H_ */

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