Debug Linux Dynamic libraries (Dynamic library creation, invocation, debugging) __linux

Add is a function in the library LIB.C to generate liblib.so

GCC lib.c-shared-g-debug-o liblib.so

Compiles a program that invokes the library, specifying that the library file uses the current path

GCC Applib.c-o applib-wall-g liblib.so-wl,-rpath,./

To set a breakpoint on the dynamic library function add

(GDB) b add

Enter y in the prompt below

Function "Add" not defined.

Make breakpoint pending on future shared library load? (Y or [n]) y

Breakpoint 1 (Add) pending.

Execute program R

(GDB) R

The prompts are as follows:

Starting program:/home/zqk/work/webserver/applib

Breakpoint 1, add (a=2, b=3) at Lib.c:3

3 return a+b;

Then it goes into the function of the dynamic library.

Continue executing the program, enter C

(GDB) C

Continuing.

Rusult is 5

Program exited normally.

Here is the test program:

* LIB.C * *

int add (int a,int b)

{

return a+b;

}

* Lib.h * *

extern int Add (int a,int b);

* Applib * *

#include <stdio.h>

#include "Lib.h"

int main (void)

{

int a=2;

int b=3;

int result;

result = Add (a,b);

printf ("Rusult is%d/n", result);

return 0;

}