库名称是: ggg
动态链接库文件名是: libggg.so
头文件是: get.h
提供这样两个函数调用接口:
int get ();
int set (int a);
g++ get.cpp -shared -g -DDEBUG -o libggg.so
g++ pk.cpp -o app -Wall -g -lggg
g++ pk.cpp -o app -Wall -g -lggg -L`pwd`
zhoulifa@linux#gdb ./app
GNU gdb 6.4-debian
Copyright 2005 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i486-linux-gnu"...Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
(gdb) b main /* 这是在程序的 main 处设置断点 */
Breakpoint 1 at 0x804853c: file pk.cpp, line 7.
(gdb) b set /* 这是在程序的 set 处设置断点 */
Function "set" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y /* 这里必须选择 y 调试程序才会跟踪到动态链接库内部去 */
Breakpoint 2 (set) pending.
(gdb) run /* 开始运行我们的程序,直到遇见断点时暂停 */
Starting program: /data/example/c/app
Breakpoint 3 at 0xb7f665f8: file get.cpp, line 11.
Pending breakpoint "set" resolved
Breakpoint 1, main (argc=1, argv=0xbf990504) at pk.cpp:7
7 int a = 100;
(gdb) n /* 继续执行程序的下一行代码 */
8 int b = get ();
(gdb) n /* 程序执行到了我们断点所在的动态链接库了 */
get x=0
9 int c = set (a);
(gdb) n
Breakpoint 3, set (a=100) at get.cpp:11
11 printf ("set a=%d\n", a);
(gdb) list /* 查看当前代码行周围的代码,证明我们已经跟踪到动态链接库的源代码里面了 */
6 printf ("get x=%d\n", x);
7 return x;
8 }
9 int set (int a)
10 {
11 printf ("set a=%d\n", a);
12 x = a;
13 return x;
14 }
(gdb) n
set a=100
12 x = a;
(gdb) n
13 return x;
(gdb) n
14 }
(gdb) n
main (argc=1, argv=0xbf990504) at pk.cpp:10
10 int d = get ();
(gdb) n
get x=100
11 printf ("a=%d,b=%d,c=%d,d=%d\n",a,b,c,d);
(gdb) n
a=100,b=0,c=100,d=100
12 return 0;
(gdb) c
Continuing.
Program exited normally.
(gdb) quit /* 程序顺利执行结束 */
zhoulifa@linux#
zhoulifa@linux# gdb ./app
GNU gdb 6.4-debian
Copyright 2005 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i486-linux-gnu"...Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
(gdb) b main
Breakpoint 1 at 0x804853c: file pk.cpp, line 7.
(gdb) b set
Function "set" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 2 (set) pending.
(gdb) run /* 虽然调试操作都一样,但程序执行失败 */
Starting program: /data/example/c/app
/data/example/c/app: error while loading shared libraries: libggg.so: cannot open shared object file: No such file or directory
Program exited with code 0177.
(gdb) quit
zhoulifa@linux#
原帖由 mycuname 于 2006-11-17 10:56 发表
大家都知道在 Linux 可以用 gdb 来调试应用程序,当然前提是用 gcc 编译程序时要加上 -g 参数。
我这篇文章里将讨论一下用 gdb 来调试动态链接库的问题。
首先,假设我们准备这样的一个动态链接库:
要生成 ...
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