Transferring a parent process and its childs

[Charlie Brown]

Suppose I have a konsole running with a process building a port package and plasma session crashed (again ) and now I want to transfer the process and its sub process to a tty, what's the proper way of doing it? and is reptyr the right tool?

 

[cracauer@]

Use tmux

 

[AlfredoLlaquet]

If the supposition is the current reality, it's too late for using tmux. sysutils/reptyr is indeed worth a try.

 

[Charlie Brown]

If the supposition is the current reality, it's too late for using tmux. sysutils/reptyr is indeed worth a try.

yes the supposition is true, but the way I understood it, reptyr can manage to transfer only one process, not the tree of that process. I did run a make install which has many child process, it still running in the konsole, but the plasma session isn't working.

 

[AlfredoLlaquet]

If you transfer the parent process, it might have the intended results or it might not. Here ends my knowledge.

 

[scottro]

systeutils/reptyr with tmux is probably what you want. Start whatever you're doing in a tmux session make a note of its PID. As I write this, I was thinking that that was what I used to do, but I realize I'm remembering incorrectly. Still, it sounds like it might work. <shrug> Sorry, it really did seem a good idea when I started typing--I'm leaving the thought here to see what other, smarter people will say.

 

[Charlie Brown]

Maybe the child processes of the make program are in the file descriptor of that programs?

reptyr works by attaching to the target program using
ptrace(2), redirecting relevant file descriptors,

 

[Charlie Brown]

-T

Use an alternate mode of attaching, "TTY-stealing". In
this mode, reptyr will not ptrace(2) the target
process, but will attempt to discover the terminal
emulator for that process' pty, and steal the master
end of the pty. This mode is more reliable and flexible
in many circumstances (for instance, it can attach all
processes on a tty, rather than just a single process).
However, as a downside, children of sshd(8) cannot be
attached via -T unless reptyr is run as root. See for
more information about tty-stealing.

it migth work but this not a quote from freebsd manpages ,but rather termux. I'll have to check if the option is in freebsd too.

[edit]

Yes same its the same manpages.

 

[Charlie Brown]

I'm currently running it:
reptyr -T [PID]

 

[Charlie Brown]

Its not working on freebsd I get a bad adress as output:

reptyr supports Linux and FreeBSD. Not all functionality is currently available on FreeBSD. (Notably, FreeBSD doesn't support reptyr -T at this time.

so the man page isn't correct.
https://github.com/jpluimers/nelhage.reptyr

 

[Charlie Brown]

It didn't work (I mean for me, my need, otherwise it worked as expected) reptyr [PID] it waited for child process to stop, it would have waited the build to be done. This is not what I was looking for. the only option that would have worked doesn't on freebsd.

I did [CTR-C] to terminate it and it kill the all thing because it was the parent process I was messing with.

I'm making install again in tty this time

I'll leave this thread open in case someone have anything to add and maybe a solution.