如何在 GDB 工具中使用 actions 命令？

Question

下面是我用来理解 gdb 中的动作命令的代码。

#include <stdio.h>
int Use_Action(int CatchedInt, char * CatchedStr)
{
    printf("CatchedInt = %d, CatchedStr = %s\n", CatchedInt, CatchedStr);
    return 0;
}
int main(void)
{
    int PassingInt = 20;
    char PassingStr[10] = "Hello";

    Use_Action(PassingInt, PassingStr);
}

在 GDB 工具中，我在 https://sourceware.org/gdb/current/onlinedocs/gdb/Tracepoint-Actions.html

的帮助下完成了以下操作

(gdb) trace Use_Action 
Tracepoint 1 at 0x1169: file action.c, line 5.
(gdb) info tracepoints 
Num     Type           Disp Enb Address            What
1       tracepoint     keep y   0x0000000000001169 in Use_Action at action.c:5
    not installed on target
(gdb) actions 
Enter actions for tracepoint 1, one per line.
End with a line saying just "end".
>collect CatchedInt
>end
(gdb) info tracepoints 
Num     Type           Disp Enb Address            What
1       tracepoint     keep y   0x0000000000001169 in Use_Action at action.c:5
        collect CatchedInt
    not installed on target

如果我通过命令 collect Catchedint 收集了 "Catchedint" 的值，那么如何显示该值。我错过了什么吗？或者我理解错了这个动作命令！！？

Answer 1

Is there something I missed?

是：您需要在收集跟踪时实际运行程序，使用 tstart、run 和 tstop 命令。

如果您尝试这样做，您可能会收到此错误：

(gdb) tstart
You can't do that when your target is `exec'

那是因为只有一些目标支持跟踪点，而本地执行不支持。您需要改用 gdbserver。

如何在 GDB 工具中使用 actions 命令？

How to use actions command in GDB tool?

c

gdb