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NAME

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

览
       #include <linux/module.h>

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

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.

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.

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.

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