[9fans] Inferno: starting a process in a stopped state

[Edouard Klein <edou@rdklein.fr>]

Hi !

I'm writing dis assembly, and I would like to debug my program right
from the entrypoint.

I intend to use the /prog filesystem for that, thanks to which one can
stop a program by echoing "stop" to dbgctl file.

However, what I need to do is stop the program at the very start.

I have multiple ideas, such as introducing a sleep or a read that would
let me enough time to stop the program, but they have the bad property
of modifying the program.

I could create a loader program that would exec the target program and
stop the loader right before the exec, and I suspect (but I'm not sure)
that would let me stop the target program.

But these all sound very rube goldbergy to me.

Is there a way to start a program in a stopped state that I have
overlooked ?

Thanks in advance,

Cheers,

Edouard.

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