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NAME

       query_module - 向核心查詢和模塊有關的各個位.   /* 查詢有關的位?? */

總覽

       #include <linux/module.h>

       int query_module(const char *name, int which,void *buf, size_t bufsize, size _t *ret);

描述

       query_module請求和可加載模塊有關的來自核心的信息.信息的細致的特性和格式依賴於
       which參數,一些函數要求name參數來命名當前被加載的模塊.一些允許參數name為null,
       指明核心是正確的.:  which的值  0    Always  returns  success. Used to probe for the system
       call.  0   總是返回成功,用來探測系統調用.   /* 參見 insmod  -p  和前面文章  */  QM_MODULES
       Returns the names of all loaded modules. The output buffer
        format is adjacent null-terminated strings; ret is set to the number of mod ules.
           返回所有已加載的模塊的名字.輸出緩沖區的格式是鄰近的以null終止的字符串;ret           被
       設置為模塊的數目.  QM_DEPS        Returns the names of all modules used by  the  indicated
       module.   The output buffer format is adjacent null-terminated strings; ret is set t o the
       number     of     modules.        返回所有被name參數指定的模塊使用的模塊的名字.輸出     緩
       沖區格式是鄰近的以null終止的字符串;ret被設置為模塊的數目.    QM_REFS          Returns  the
       names of all modules using the indicated module.  This is  the  inverse  of  QM_DEPS.  The
       output  buffer  format  is  adjacent null-te rminated strings; ret is set to the number of
       modules.
           返回所有正使用被name參數指定的模塊的模塊名字.這和QM_DEPS是相反的.輸出緩沖           區
       格式是以鄰近的null終止的字符串;ret被設置為模塊的數目.    QM_SYMBOLS          Returns   the
       symbols and values exported by the kernel or t he indicated module. The buffer  format  is
       an array of:
                      struct module_symbol
                     {
                       unsigned long value;
                       unsigned long name;
                     };
                     followed  by  null-terminated  strings.  The  value of name is the character
       offset of the string relative to the start of buf; ret is set to t he number of symbols.
           返回被核心或指定模塊導出(開放)的符號和值對.緩沖區格式是一個以null終止的
       結構數組,name的值是相對緩沖區的開始的字符串的字符偏移;ret被設置為符號的數目.

           struct module_symbol
           {
             unsigned long value;
             unsigned long value;
           }  QM_INFO         Returns  miscelaneous  information about the indicated module.  The
       output buffer format is:
                     struct module_info
                     {
                       unsigned long address;
                       unsigned long size;
                       unsigned long flags;
                     };
                     where address is the kernel address at which the module reside  s,  size  is
       the size of the module in bytes, and flags is a mask of MOD_RUNNI NG, MOD_AUTOCLEAN, et al
       that indicates the current status of  the  module.  re  t  is  set  to  the  size  of  the
       module_info struct.
           返回各種和指定模塊相關的各種信息,輸出緩沖區的格式如下:
           struct module_info
           {
           unsigned long address;
           unsigned long size;
           unsigned long flags;
           }
        address是模塊在核心空間中駐留的地址,size是模塊以字節計數的大小,flags是MOD_R
       UNING,MOD_AUTOCLEAN等指示模塊當前狀態的標誌的按位或組成的掩瑪.ret被設置為mod
       ule_info結構的大小.

返回值

       成功時總是返回0,錯誤是返回-1,全局變量errno被相應設置.

錯誤

       ENOENT
                  被name指定的模塊不存在.

       EINVAL

       ENOSPC
                  提供的緩沖區太小,ret被設置為需要的最小大小.

       EFAULT
                  name,buf或ret中至少一個越出了程式可訪問的地址空間.

             "雷勇" <nsinit@263.net>
                                                                                  query_module(2)