如何调试叉EXEC过程的入口点？ [英] How to debug the entry-point of fork-exec process?

问题描述

我有产卵，当它启动另一个进程（P）是C Linux应用程序（A）。当我要调试P I一开始像往常一样，我和DDD / GDB为P连接。

I have a C linux application (A) that spawns another process (P) when it is started. When I want to debug P I start A as usual and I connect with ddd/gdb to P.

问题出现时，我要调试P的入口点（主要的开始）。如果我按照通常的做法，当我在调试器连接到P是已到晚期。我找到的解决方案是在主磷的开头插入一个睡觉，所以我有时间使用gdb连接，但这并不是一个很优雅的解决方案。

Problems appear when I want to debug the entry-point (start of main) of P. If I follow the usual approach when I connect the debugger to P is already to late. The solution I've found was to insert a sleep at the begining of the main of P so I have time to connect with gdb but this is not a very elegant solution.

我已经使用 ASM（INT $ 3）也尝试过，但似乎并不工作。

I've also tried using asm("int $3") but it doesn't seems to work.

你有什么想法，我怎么能解决这个问题？ （preferably不改变A或P的code）

Do you have any idea how I could solve this problem? (preferably without altering the code of A or P)

推荐答案

您应该使用此选项：

set follow-fork-mode mode

其中的模式的是父，孩子或问。

要跟随父（这是默认值）是：

To follow the parent (this is the default) use:

set follow-fork-mode parent

要遵循孩子：

set follow-fork-mode child

要具备调试器问你每次：

To have the debugger ask you each time:

set follow-fork-mode ask

所以基本上你会开始了GDB连接到A，然后设置GDB跟随孩子，然后当A产卵P，广发行将连接到P和从A分离。

So basically you'd start out connecting gdb to A, then set gdb to follow the child, and then when A spawns P, gdb will connect to P and detach from A.

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