Re: Can stdout/stderr of a running process be dynamically redirected in FreeBSD ?

On Sun, Jun 9, 2024, 12:28 PM Yuri <yuri@freebsd.org> wrote:

> Imagine the situation when there is a process that is running in the
> terminal and periodically printing something related to its progress.
>
> At some point this terminal output should be replaced by a TUI in the same
> terminal that would capture the original process' output and show it in its
> TUI sub-window, and would also show some other info.
>
>
> There is the project for Linux called "redirect" that does such
> stdout/stderr redirection: https://github.com/jerome-pouiller/reredirect/
>
> However, it uses ptrace functions that are missing in FreeBSD, like
> PTRACE_POKEUSER.
>
>
> Is it possible to perform the action like is described in the first
> paragraph in some other way, given that ptrace doesn't have required
> functions?
>
>
> This function is useful in many business contexts, when users run some
> long-running tools, and there is a variety of ways how results of these
> tools can be displayed to the user.
>

Look at the snp device and watch. They are close if a tty is involved.

Warner

> Thanks,
>
> Yuri
>
>
>