how to continue from a breakpoint in GNU/Hurd

[Yue Lu]

Hi.

I am writing a debugger demo under GNU/Hurd when I study the gdb source code. And I have met a big problem that when I set a breakpoint in the inferior, my code can't resume inferior from it.

I can get the exception message from the mach kernel when the inferior hit the breakpoint. As soon as I got the exception message, I removed the int3, and set the EIP to the previous values, then post a signal zero to the inferior by msg_sig_post_untraced_request(). at last I called thread_resume() to resume it. But thing goes wrong, the inferior is always stops at the breakpoint. and seems never to continue.

I don't know how to fix this, could any of you give me a suggestion? thanks very much.

--
Yue Lu (陆岳)