[yqtao@localhost linux]$ cat buging.c 
#include <stdio.h>
int getSum(int n) {
    int sum=0,i;
    for (i=1;i<=n;i++)
        sum+=i;
    return sum;
}
int main(){
    int res=getSum(100);
    printf("1+2+...+100=%d\n",res);
}

// 查看源碼
// 查看第幾行附近
// 可簡寫成l 2
(gdb) list 2   
1    #include <stdio.h>
2    int getSum(int n) {
3        int sum=0,i;
4        for (i=1;i<=n;i++)
5            sum+=i;
6        return sum;
7    }

// 查看main函數(shù)附近的源碼
(gdb) list main
3        int sum=0,i;
4        for (i=1;i<=n;i++)
5            sum+=i;
6        return sum;
7    }
8    int main(){
9        int res=getSum(100);
10       printf("1+2+...+100=%d\n",res);
11   }


// 設(shè)置斷點
// break +n在第幾行設(shè)斷點
(gdb) break 8
Breakpoint 1 at 0x4004fa: file buging.c, line 8.
// break +函數(shù)名 ，在函數(shù)名處設(shè)斷點
(gdb) break getSum
Breakpoint 2 at 0x4004cb: file buging.c, line 3.

//查看斷點信息
(gdb) info breakpoints 
Num   Type      Disp Enb Address      What
1    breakpoint   keep y  0x00000000004004fa in main at buging.c:8
2    breakpoint   keep y  0x00000000004004cb in getSum at buging.c:3

// 刪除斷點
// delete +n 或 d +n
// 如果不加數(shù)字則刪除全部的斷點
(gdb) d 2
(gdb) info breakpoints 
Num   Type      Disp Enb Address      What
1    breakpoint   keep y  0x00000000004004fa in main at buging.c:8

disable +n //關(guān)閉斷點
enable +n  //啟動斷點

// 進(jìn)入gdb
[yqtao@localhost linux]$ gdb buging
// 在main()函數(shù)處設(shè)斷點
(gdb) info breakpoints 
// 運行程序
(gdb) run
Breakpoint 1, main () at buging.c:9
9        int res=getSum(100);

(gdb) step
getSum (n=100) at buging.c:4
4        for (i=1;i<=n;i++)
// 查看代碼
(gdb) l
1    #include <stdio.h>
2    int getSum(int n) {
3        int sum=0,i;
4        for (i=1;i<=n;i++)
5            sum+=i;
6        return sum;
7    }
8    int main(){
9        int res=getSum(100);
10       printf("1+2+...+100=%d\n",res);
// 下一步
(gdb) s
5            sum+=i;
// 打印sum的值
// 看到sum是為賦初值的
(gdb) p sum
$1 = 4195633
// info locals
//打印當(dāng)前斷點處所在函數(shù)的所有局部變量的值，不包括函數(shù)參數(shù)。
(gdb) info locals
sum = 4195635
i = 3