GDB调试例子
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This GDB was configured as "i386-SuSE-linux"...
(gdb)l????<-------------------- l命令相当于list，从第一行开始例出原码。
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)??????<-------------------- 直接回车表示，重复上一次命令
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) break16???<-------------------- 设置断点，在源程序第16行处。
Breakpoint 1 at 0x8048496: file tst.c, line 16.
(gdb) break func?<-------------------- 设置断点，在函数func()入口处。
Breakpoint 2 at 0x8048456: file tst.c, line 5.
(gdb) info break?<-------------------- 查看断点信息。
NumType??????????Disp EnbAddress???What
1??breakpoint????keep y?? 0x08048496 in main attst.c:16
2??breakpoint????keep y?? 0x08048456 in func attst.c:5
(gdb)r??????????<--------------------- 运行程序，run命令简写
Starting program: /home/hchen/test/tst
Breakpoint 1, main () attst.c:17???<---------- 在断点处停住。
17??????????????long result = 0;
(gdb)n?????????<--------------------- 单条语句执行，next命令简写。
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?????????<--------------------- 继续运行程序，continue命令简写。
Continuing.
result[1-100] =5050??????<----------程序输出。
Breakpoint 2, func (n=250) attst.c:5
5???????????????int sum=0,i;
(gdb) n
6???????????????for(i=1; i<=n; i++)
(gdb) pi???????<--------------------- 打印变量i的值，print命令简写。
$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???????<--------------------- 查看函数堆栈。
#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???<--------------------- 退出函数。
Run till exit from #0? func (n=250) attst.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????<--------------------- 继续运行。
Continuing.
result[1-250] =31375???<----------程序输出。
Program exited with code 027.<--------程序退出，调试结束。
(gdb)q????<--------------------- 退出gdb。
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参考：
http://unix-cd.com/unixcd12/article_7137.html
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