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From: Shyam Saini <mayhs11saini@gmail.com>
To: Pintu Agarwal <pintu.ping@gmail.com>
Cc: open list <linux-kernel@vger.kernel.org>,
	pedro@palves.net, Kernelnewbies <kernelnewbies@kernelnewbies.org>
Subject: Re: Pause a process execution from external program
Date: Thu, 13 Jun 2019 13:22:12 +0530
Message-ID: <CAOfkYf7BZ1Ttrm7iVioq4mxZcJy7V44gNmusavPzgi=59=TY6g@mail.gmail.com> (raw)
In-Reply-To: <CAOuPNLifSHQmi+jCMzRGYz3kzct+NB_vyv-yiwL91adRZPkTrQ@mail.gmail.com>

Hi Pintu,


> Hi All,
> I was just wondering if this is possible in the Linux world.
> My requirement is:
> For some reason, I want to halt/pause the execution (for some
> specified time) of a running process/thread (at some location),
> without modified the source, may be by firing some events/signals from
> an another external program, by specifying the address location or a
> line number.
>
> Is this possible ?
> May be by using some system call, or other mechanism using the process PID.
> Assume that its a debugging system with all root privileges.
>
> Basically, its just like how "gdb" is able to set the break-point in a
> program, and able to stop its execution exactly at that location.
> I am wondering what mechanism "gdb" uses to do this?

gdb uses ptrace system call, may you can explore ptrace?

> I tried to check here, but could find the exact place, where this is handled:
> https://github.com/bminor/binutils-gdb/blob/master/gdb/breakpoint.c

from command line we use ctrl-z to stop execution of a foreground
process but you can program
SIGTSTP signal handler in your application code to do the same.

is that you want ?

Thanks a lot,
Shyam

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Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-13  7:43 Pintu Agarwal
2019-06-13  7:52 ` Shyam Saini [this message]
2019-06-13 14:53   ` Pintu Agarwal
2019-06-13 19:43   ` Valdis Klētnieks
2019-06-17 12:20     ` Pintu Agarwal
2019-06-13 15:21 ` Elias Kouskoumvekakis
2019-06-17 12:19   ` Pintu Agarwal

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