gdb 调式 apache ，单步执行，程序执行顺序不定，怎么回事？

MacLinuXp

我用gdb调试 一个apache demo模块的时候，不知怎么会是，出现下面这种情况，感觉就像多线程一样。

1. [root@localhost modules]# gdb httpd
   
2. GNU gdb (GDB) Fedora (7.3.50.20110722-13.fc16)
   
3. Copyright (C) 2011 Free Software Foundation, Inc.
   
4. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
   
5. This is free software: you are free to change and redistribute it.
   
6. There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
   
7. and "show warranty" for details.
   
8. This GDB was configured as "i686-redhat-linux-gnu".
   
9. For bug reporting instructions, please see:
   
10. <http://www.gnu.org/software/gdb/bugs/>...
    
11. Reading symbols from /usr/sbin/httpd...Reading symbols from /usr/lib/debug/usr/sbin/httpd.debug...done.
    
12. done.
    
13. (gdb) b read_post_data
    
14. Function "read_post_data" not defined.
    
15. Make breakpoint pending on future shared library load? (y or [n]) y
    
16. 
    
17. Breakpoint 1 (read_post_data) pending.
    
18. (gdb) run -X -f /etc/httpd/conf/httpd.conf
    
19. Starting program: /usr/sbin/httpd -X -f /etc/httpd/conf/httpd.conf
    
20. [Thread debugging using libthread_db enabled]
    
21. Using host libthread_db library "/lib/libthread_db.so.1".
    
22. httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain for ServerName
    
23. warning: Temporarily disabling breakpoints for unloaded shared library "/etc/httpd/modules/mod_pronunciation_score.so"
    
24. 
    
25. Breakpoint 1, read_post_data (req=0x801a71d0, post=0xbfffee68, post_size=0xbfffee6c)
    
26.     at mod_pronunciation_score.c:17
    
27. 17         static int read_post_data(request_rec *req, char **post, size_t *post_size){
    
28. Missing separate debuginfos, use: debuginfo-install cyrus-sasl-lib-2.1.23-27.fc16.i686 nspr-4.9-2.fc16.i686 nss-3.13.4-2.fc16.i686 nss-util-3.13.4-2.fc16.i686
    
29. (gdb) n
    
30. 18            char buffer[DFT_BUF_SIZE] = {0};
    
31. (gdb) n
    
32. 17         static int read_post_data(request_rec *req, char **post, size_t *post_size){
    
33. (gdb) n
    
34. 18            char buffer[DFT_BUF_SIZE] = {0};
    
35. (gdb) n
    
36. 17         static int read_post_data(request_rec *req, char **post, size_t *post_size){
    
37. (gdb) n
    
38. 18            char buffer[DFT_BUF_SIZE] = {0};
    
39. (gdb) n
    
40. 17         static int read_post_data(request_rec *req, char **post, size_t *post_size){
    
41. (gdb) n
    
42. 23            if(ap_setup_client_block(req, REQUEST_CHUNKED_DECHUNK) != OK){
    
43. (gdb) n
    
44. 17         static int read_post_data(request_rec *req, char **post, size_t *post_size){
    
45. (gdb) n
    
46. 21            bytes = count = offset = 0;
    
47. (gdb)
    

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GFree_Wind

去掉优化选项

MacLinuXp

回复 2# GFree_Wind

去掉优化选项？gcc的优化选项么？我直接 yum 安装的 httpd 和 httpd-devel。


   

MacLinuXp

回复 2# GFree_Wind

多谢，我应该是 在 编译模块的时候去掉编译选项， apxs -c -Wc,-O0 xxx.c 这样就OK了。