NAME

       query_module - 向内核查询和模块有关的各个位.   /* 查询有关的位?? */

总览

       #include <linux/module.h>

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

描述

       query_module请求和可加载模块有关的来自内核的信息.信息的细致的特性和格式依赖于 which参数,一
       些函数要求name参数来命名当前被加载的模块.一些允许参数name为null,        指明内核是正确的.:
       which的值  0    Always returns success. Used to probe for the system call.  0   总是返回成
       功,用来探测系统调用.   /* 参见 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.
           返回所有已加载的模块的名字.输出缓冲区的格式是邻近的以null终止的字符串;ret  被 设置为模
       块的数目.  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参数指定的模块使用的模块的名字.输出 缓  冲区格式是邻近的以null终
       止的字符串;ret被设置为模块的数目.   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参数指定的模块的模块名字.这和QM_DEPS是相反的.输出缓冲  区 格式是以
       邻近的null终止的字符串;ret被设置为模块的数目.  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.
           返回被内核或指定模块导出(开放)的符号和值对.缓冲区格式是一个以null终止的         结构数
       组,name的值是相对缓冲区的开始的字符串的字符偏移;ret被设置为符号的数目.

           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.
           返回各种和指定模块相关的各种信息,输出缓冲区的格式如下:
           struct module_info
           {
           unsigned long address;
           unsigned long size;
           unsigned long flags;
           }
        address是模块在内核空间中驻留的地址,size是模块以字节计数的大小,flags是MOD_R
       UNING,MOD_AUTOCLEAN等指示模块当前状态的标志的按位或组成的掩玛.ret被设置为mod  ule_info结构
       的大小.

返回值

       成功时总是返回0,错误是返回-1,全局变量errno被相应设置.

错误

       ENOENT
                  被name指定的模块不存在.

       EINVAL

       ENOSPC
                  提供的缓冲区太小,ret被设置为需要的最小大小.

       EFAULT
                  name,buf或ret中至少一个越出了程序可访问的地址空间.

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