c/c++基礎(二十六) gdb調試so

當自己開發了一個so檔案，如何調試呢。

對於如何編寫一個so，請參考文章：http://blog.csdn.net/zz7zz7zz/article/details/41448987

對於如何進行gdb調試，請參考文章：http://blog.csdn.net/zz7zz7zz/article/details/41654457

我們的源檔案分別如下：

filea.c

#include <stdio.h>void fun1(){printf("i am from filea fun1 \n");printf("i am from filea fun11 \n");printf("i am from filea fun12 \n");}

fileb.c

#include <stdio.h>void fun2(){printf("i am from fileb fun2 \n");printf("i am from fileb fun21 \n");printf("i am from fileb fun22 \n");}

CLoadSo.h

#ifndef _CLOADSO_H#define _CLOADSO_H#ifdef _cplusplusextern "C" {#endifvoid fun1();void fun2();#ifdef _cplusplus}#endif#endif

CLoadSo.c

#include <stdio.h>#include <dlfcn.h>#include "CLoadSo.h"int main(int argc,char **argv){void *soHandle;int (*fun)();char *errorMsg;soHandle=dlopen("first.so",RTLD_LAZY);errorMsg=dlerror();printf("A1---------loadSo  is %s \n",soHandle ? "success" : "failed");if(errorMsg){printf("A2--------loadSo error , Msg is: %s \n",errorMsg);return -1;}fun=dlsym(soHandle,"fun1");errorMsg=dlerror();printf("B1---------fun1 , fun1 is %s \n",fun ? "success" : "Null");if(fun){fun();}if(errorMsg){printf("B2---------fun1 error , Msg is: %s \n",errorMsg);}fun=dlsym(soHandle,"fun2");errorMsg=dlerror();printf("B3---------fun2 , fun2 is %s \n",fun ? "success" : "Null");if(fun){fun();}if(errorMsg){printf("B4---------fun2 error , Msg is: %s \n",errorMsg);}fun=dlsym(soHandle,"fun3");errorMsg=dlerror();printf("B5---------fun3 , fun3 is %s \n",fun ? "success": "Null");if(fun){fun();}if(!errorMsg){printf("B6---------fun3 error , Msg is: %s \n",errorMsg);}dlclose(soHandle);printf("C---------close LoadSo \n");return 0;}

用命令  gcc -Wall -fpic -g -shared filea.c fileb.c -o first.so 產生first.so檔案

用命令 gcc -g -Wall CLoadSo.c -o CLoadSo -ldl產生可執行檔CLoadSo

gdb步驟如下(請注意觀察備註陳述式)：

結果：成功進入到了so的fun1中

大概步驟：

1.啟動gdb調試:gdb CLoadSo

2.打斷點 gdb) : break 28

3.執行 gdb) : run

4.將動態庫的符號讀入gdb，為了你能找到變數和函數名 gdb)sharedlibrary first.so

5.s進入函數，l列出原始碼，n逐步執行，直到結束.

代碼地址：http://download.csdn.net/detail/zz7zz7zz/8311533