Re: how to assert user input to fifo to then read from it

[Alex fxmbsw7 Ratchev]

On Thu, Aug 25, 2022, 13:32 Greg Wooledge <greg@wooledge.org> wrote:

> On Thu, Aug 25, 2022 at 11:36:11AM +0200, Alex fxmbsw7 Ratchev wrote:
> > im doing some apt update cmds script
> > in there i realized i need detached input for , when as dedicated auto
> > updater used , a question appears , to answer this
> > ( seeing by log then reacting to via printf to fifo , and checking then
> log
> > further )
> >
> > the script yet is attached
> > the in question is line 20 , it does exec <"$fi"
> > .. and my question is what previously to exec to put scripts stdin ( may
> > not be tty .. ? ) into that fifo , then that the exec < that_fifo
> >
> > understood halfways ?
>
> If we remove the FIFO from the equation, it sounds like you want to
> inject some scripted data into the terminal's input buffer.
>

i try an auto updater, that prints to stdout and tee -a logfile
that autoupdater be run via sysvinit , and ( dennis hinted it out ,
noninteractive something , but i need this code)
but the idea is run dedicated autoupdater , and have coded the possibility
that when it hangs on dpkg question, via fifo to input to it

i learnt roughly only fifos will work for intercomm

and in that, i figured, i need the code to delegate user input to fifo ,
which then gets to be stdin of the runtime

.. script start , put to-script fd to fifo , and set scripts stdin fd be
from that fifo

i can imagine , exec <fifo , ( apt dpkg commands
..<abort>
a cat >fifo be foreground process
while apt dpkg commands run in background , or coproc

.. complicated

thanks much !

There's this:
>
> greg@remote:/home/greybot/factoids$ cat tiocsti ; echo
> The TIOCSTI ioctl() command lets you insert input into a terminal driver's
> queue. "Simulate Terminal Input".
>
> If you can do the injection in C, you can use that.
>
> Otherwise, maybe you can do something with tmux or screen?  I don't know
> those programs well enough.
>
> Or if all else fails, there's always Expect.
>
>