怎么样用gdb attach调试一个进程?

nait

我试了几次都不成功

1. [leo@leo ~]$ gdb
   
2. GNU gdb 6.2
   
3. Copyright 2004 Free Software Foundation, Inc.
   
4. GDB is free software, covered by the GNU General Public License, and you are
   
5. welcome to change it and/or distribute copies of it under certain conditions.
   
6. Type "show copying" to see the conditions.
   
7. There is absolutely no warranty for GDB.  Type "show warranty" for details.
   
8. This GDB was configured as "i686-pc-linux-gnu".
   
9. (gdb) attach 10433
   
10. Attaching to process 10433
    
11. Reading symbols from /mnt/share/tmp/Research/fceu/src/fceu...done.
    
12. Using host libthread_db library "/lib/libthread_db.so.1".
    
13. Reading symbols from /lib/libz.so.1...done.
    
14. Loaded symbols for /lib/libz.so.1
    
15. Reading symbols from /usr/lib/libSDL-1.2.so.0...done.
    
16. Loaded symbols for /usr/lib/libSDL-1.2.so.0
    
17. Reading symbols from /lib/libpthread.so.0...done.
    
18. [Thread debugging using libthread_db enabled]
    
19. [New Thread -1213580864 (LWP 10433)]
    
20. Loaded symbols for /lib/libpthread.so.0
    
21. Reading symbols from /lib/libc.so.6...done.
    
22. Loaded symbols for /lib/libc.so.6
    
23. Reading symbols from /lib/libm.so.6...done.
    
24. Loaded symbols for /lib/libm.so.6
    
25. Reading symbols from /usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.4/libstdc++.so.5...done.
    
26. Loaded symbols for /usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.4/libstdc++.so.5
    
27. Reading symbols from /lib/libdl.so.2...done.
    
28. Loaded symbols for /lib/libdl.so.2
    
29. Reading symbols from /usr/lib/libasound.so.2...done.
    
30. Loaded symbols for /usr/lib/libasound.so.2
    
31. Reading symbols from /usr/lib/libX11.so.6...done.
    
32. Loaded symbols for /usr/lib/libX11.so.6
    
33. Reading symbols from /usr/lib/libXext.so.6...done.
    
34. Loaded symbols for /usr/lib/libXext.so.6
    
35. Reading symbols from /usr/lib/libvga.so.1...done.
    
36. Loaded symbols for /usr/lib/libvga.so.1
    
37. Reading symbols from /lib/ld-linux.so.2...done.
    
38. Loaded symbols for /lib/ld-linux.so.2
    
39. Reading symbols from /usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.4/libgcc_s.so.1...done.
    
40. Loaded symbols for /usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.4/libgcc_s.so.1
    
41. Reading symbols from /usr/lib/libXcursor.so.1.0.2...done.
    
42. Loaded symbols for /usr/lib/libXcursor.so.1.0.2
    
43. Reading symbols from /usr/lib/libXrender.so.1...done.
    
44. Loaded symbols for /usr/lib/libXrender.so.1
    
45. Reading symbols from /usr/lib/X11/locale/lib/common/xlcDef.so.2...done.
    
46. Loaded symbols for /usr/lib/X11/locale/lib/common/xlcDef.so.2
    
47. 0xffffe410 in ?? ()
    
48. (gdb) l
    
49. 357     
    
50. 358      return(0);
    
51. 359     }
    
52. 360     
    
53. 361     #ifdef EXTGUI
    
54. 362     int FCEUSDLmain(int argc, char *argv[])
    
55. 363     #else
    
56. 364     int main(int argc, char *argv[])
    
57. 365     #endif
    
58. 366     {
    
59. (gdb) s
    
60. Cannot find bounds of current function
    
61. (gdb)
    
62. Cannot find bounds of current function
    
63. (gdb) s
    
64. Cannot find bounds of current function
    
65. (gdb) n
    
66. Cannot find bounds of current function
    
67. (gdb)
    

复制代码

被attach的进程是停止执行了,可是用s,n等命令都不行
可是gdb的info里明明写着

1. You can examine and modify an attached process with [color="Magenta"]all[/color] the GDB commands that are ordinarily available when you start processes with `run'.

复制代码

rickxbx

试了一下,如果给你的被attach的进程设一个断点(breakpoint)则可以调试

nait

怎么设置断点啊?
我bt了一下,结果发现运行到共享库里去了,难怪n和s都不行呢
但是还是不知道该怎么办