.TH query_module 2
.SH NAME
query_module \- 向核心查詢和模組有關的各個位.   /* 查詢有關的位?? */
.SH 總覽
.B #include <linux/module.h>
.sp
int query_module(const char *name, int which,void *buf, size_t bufsize, size
_t *ret);
.SH 描述
query_module請求和可載入模組有關的來自核心的資訊.資訊的細緻的特性和格式依賴於
which引數,一些函式要求name引數來命名當前被載入的模組.一些允許引數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,用來探測系統呼叫.   /* 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.
    返回所有已載入的模組的名字.輸出緩衝區的格式是鄰近的以null終止的字串;ret
被
設定為模組的數目.
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引數指定的模組使用的模組的名字.輸出
緩
衝區格式是鄰近的以null終止的字串;ret被設定為模組的數目.
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引數指定的模組的模組名字.這和QM_DEPS是相反的.輸出緩衝
區
格式是以鄰近的null終止的字串;ret被設定為模組的數目.
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組匯出(開放)的符號和值對.緩衝區格式是一個以null終止的
結構陣列,name的值是相對緩衝區的開始的字串的字元偏移;ret被設定為符號的數目.

    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.
    返回各種和指定模組相關的各種資訊,輸出緩衝區的格式如下:
    struct module_info
    {
    unsigned long address;
    unsigned long size;
    unsigned long flags;
    }
 address是模組在核心空間中駐留的地址,size是模組以位元組計數的大小,flags是MOD_R
UNING,MOD_AUTOCLEAN等指示模組當前狀態的標誌的按位或組成的掩瑪.ret被設定為mod
ule_info結構的大小.
.SH 返回值
成功時總是返回0,錯誤是返回-1,全域性變數errno被相應設定.
.SH 錯誤
.TP
ENOENT 
    被name指定的模組不存在.
.TP
EINVAL
.TP
ENOSPC
    提供的緩衝區太小,ret被設定為需要的最小大小.
.TP
EFAULT
    name,buf或ret中至少一個越出了程式可訪問的地址空間.       

.SH
      "雷勇" <nsinit@263.net>
.SH "跋"
.br
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