调试：coredump和linux下gdb单步调试、传递配置文件路径信息

GDB + coredump调试

开启coredump:ulimit -c unlimited

ulimit -a 显示当前用户的各种限制。

ulimit -n 的数值表示每个进程可以打开的文件数目。

GDB调试

在某个文件设断点：
     break filename:linenum     break filename:functionhttp://www.delorie.com/gnu/docs/gdb/gdb_29.html 另：http://blog.csdn.net/gnuhpc/article/details/4368831

http://blog.csdn.net/yeyuangen/article/details/6825542

GDB 概述
[b]————[/b]

GDB GNU UNIX VC BCB IDE UNIX GDB VC BCB “ ”

GDB

    1 

    2 

    3 

    4

GDB GDB

一个调试示例
[b]——————[/b]

tst.c

     1 #include <stdio.h>

     2

     3 int func(int n)

     4 {

     5         int sum=0,i;

     6         for(i=0; i<n; i++)

     7         {

     8                 sum+=i;

     9         }

    10         return sum;

    11 }

    12

    13

    14 main()

    15 {

    16         int i;

    17         long result = 0;

    18         for(i=1; i<=100; i++)

    19         {

    20                 result += i;

    21         }

    22

    23        printf("result[1-100] = %d \n", result );

    24        printf("result[1-250] = %d \n", func(250) );

    25 }

Linux 

    hchen/test> cc -g tst.c -o tst

GDB

hchen/test> gdb tst <---------- GDB

GNU gdb 5.1.1

Copyright 2002 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 "i386-suse-linux"...

(gdb) l     <-------------------- l list 

1        #include <stdio.h>

2

3        int func(int n)

4        {

5                int sum=0,i;

6                for(i=0; i<n; i++)

7                {

8                        sum+=i;

9                }

10               return sum;

(gdb)       <-------------------- 

11       }

12

13

14       main()

15       {

16               int i;

17               long result = 0;

18               for(i=1; i<=100; i++)

19               {

20                       result += i;   

(gdb) break 16    <-------------------- 16 

Breakpoint 1 at 0x8048496: file tst.c, line 16.

(gdb) break func <-------------------- func() 

Breakpoint 2 at 0x8048456: file tst.c, line 5.

(gdb) info break <-------------------- 

Num Type           Disp Enb Address    What

1   breakpoint     keep y   0x08048496 in main at tst.c:16

2   breakpoint     keep y   0x08048456 in
4000
func at tst.c:5

(gdb) r           <--------------------- run 

Starting program: /home/hchen/test/tst

Breakpoint 1, main () at tst.c:17    <---------- 

17               long result = 0;

(gdb) n          <--------------------- next 

18               for(i=1; i<=100; i++)

(gdb) n

20                       result += i;

(gdb) n

18               for(i=1; i<=100; i++)

(gdb) n

20                       result += i;

(gdb) c          <--------------------- continue 

Continuing.

result[1-100] = 5050       <----------

Breakpoint 2, func (n=250) at tst.c:5

5                int sum=0,i;

(gdb) n

6                for(i=1; i<=n; i++)

(gdb) p i        <--------------------- i print 

$1 = 134513808

(gdb) n

8                        sum+=i;

(gdb) n

6                for(i=1; i<=n; i++)

(gdb) p sum

$2 = 1

(gdb) n

8                        sum+=i;

(gdb) p i

$3 = 2

(gdb) n

6                for(i=1; i<=n; i++)

(gdb) p sum

$4 = 3

(gdb) bt        <--------------------- 

#0 func (n=250) at tst.c:5

#1 0x080484e4 in main () at tst.c:24

#2 0x400409ed in __libc_start_main () from /lib/libc.so.6

(gdb) finish    <--------------------- 

Run till exit from #0 func (n=250) at tst.c:5

0x080484e4 in main () at tst.c:24

24              printf("result[1-250] = %d \n", func(250) );

Value returned is $6 = 31375

(gdb) c     <--------------------- 

Continuing.

result[1-250] = 31375    <----------

Program exited with code 027. <-------- 

(gdb) q     <--------------------- gdb 

hchen/test>

gdb

GDB传递配置文件路径信息

tracker@TS232:~/testdir$ gdb /opt/taisan/Taskgen/current/bin/search_engine_url_status_task_creator

(gdb) run -r  /opt/taisan/Taskgen/current

 

tracker@TS232:~/testdir$ gdb /opt/taisan/Taskgen/current/bin/search_engine_url_status_task_creator

GNU gdb 6.8-debian

Copyright (C) 2008 Free Software Foundation, Inc.

License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law.  Type "show copying"

and "show warranty" for details.

This GDB was configured as "i486-linux-gnu"...

(gdb) run -r  /opt/taisan/Taskgen/current

Starting program: /home/tracker/taisan_test/app/Taskgen/taisan_taskgen_v2.10.0.0_chenmz_test_b201204171027/bin/search_engine_url_status_task_creator -r  /opt/taisan/Taskgen/current

[Thread debugging using libthread_db enabled]

[New Thread 0xb71546c0 (LWP 5113)]

[New Thread 0xb7153b90 (LWP 5116)]

[New Thread 0xb6952b90 (LWP 5117)]

[New Thread 0xb6151b90 (LWP 5118)]

[Thread 0xb6952b90 (LWP 5117) exited]

[New Thread 0xb5944b90 (LWP 5119)]

 

Program received signal SIGSEGV, Segmentation fault.

[Switching to Thread 0xb5944b90 (LWP 5119)]

0x08051795 in search_engine_url_status_task_creator_worker::wrap_run_loop (arg=0x925b608)

    at search_engine_url_status_task_creator_worker.cpp:70

70search_engine_url_status_task_creator_worker.cpp: No such file or directory.

in search_engine_url_status_task_creator_worker.cpp

(gdb) tracker@TS232:~/testdir$ gdb /opt/taisan/Taskgen/current/bin/search_engine_url_status_task_creator