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:function http://www.delorie.com/gnu/docs/gdb/gdb_29.html 另：http://blog.csdn.net/gnuhpc/article/details/4368831http://blog.csdn.net/yeyuangen/article/details/6825542
GDB 概述
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GDB GNU UNIX VC BCB IDE UNIX GDB VC BCB “ ”
GDB
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GDB GDB
一个调试示例
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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 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