如何在gdb断点的命令中执行和执行更多命令

Question

无论何时为断点定义命令，都无法执行例如：步骤，否则以下命令不会执行。

代码例如：

[/tmp]$ cat a.c 
void increment(int* x) { 
    *x = (*x) + 1; 
} 

int main() { 
    int a = 1; 
    for (int i = 0; i < 10; i++) 
    increment(&a); 
    return 0; 
} 

[/tmp]$ gcc --std=c99 a.c -O0 -g 
[/tmp]$ gdb a.out 

GDB：

(gdb) b increment 
Breakpoint 1 at 0x10000600: file a.c, line 2. 
(gdb) command 1 
Type commands for breakpoint(s) 1, one per line. 
End with a line saying just "end". 
>p *x 
>n 
>p *x 
>end 
(gdb) r 
Starting program: /tmp/a.out 

Breakpoint 1, increment (x=0x3ffffffff670) at a.c:2 
2   *x = (*x) + 1; 
$1 = 1 
3  } 
(gdb) p *x 
$2 = 2 

它n那是p *x之后执行的p *x和n，但不是该命令。

这也恰好与c，fin，s ...

Answer 1

我发现了一个办法，但它是一个解决办法....

让我们反思的是，gdb的剧本我写：

(gdb) b increment 
Breakpoint 1 at 0x10000600: file a.c, line 2. 
(gdb) command 1 
Type commands for breakpoint(s) 1, one per line. 
End with a line saying just "end". 
>p *x 
>n 
>end 
(gdb) r 
Starting program: /tmp/a.out 

Breakpoint 1, increment (x=0x3ffffffff670) at a.c:2 
2   *x = (*x) + 1; 
$1 = 1 
3  } 
(gdb) b 
Breakpoint 2 at 0x1000061c: file a.c, line 3. 
(gdb) command 2 
Type commands for breakpoint(s) 2, one per line. 
End with a line saying just "end". 
>p *x 
>end 
(gdb) p *x 
$2 = 2 
(gdb) c 
Continuing. 

Breakpoint 1, increment (x=0x3ffffffff670) at a.c:2 
2   *x = (*x) + 1; 
$3 = 2 

Breakpoint 2, increment (x=0x3ffffffff670) at a.c:3 
3  } 
$4 = 3 
(gdb) 

因此，基本上如果我需要做任何事情之后n，s,fin ...我定义了一个休息之后，并为这个新的断点一个新的命令将d任何我想要的东西。