Date: Sun, 9 Jun 2024 11:00:17 -0700 From: Yuri <yuri@FreeBSD.org> To: Freebsd hackers list <freebsd-hackers@FreeBSD.org> Subject: Can stdout/stderr of a running process be dynamically redirected in FreeBSD ? Message-ID: <1e288f98-564a-488d-a98d-b7f45afac2c1@FreeBSD.org>
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[-- Attachment #1 --] 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. Thanks, Yuri [-- Attachment #2 --] <!DOCTYPE html> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body> <p><font face="monospace">Imagine the situation when there is a process that is running in the terminal and periodically printing something related to its progress.</font></p> <p><font face="monospace">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.<br> </font></p> <p><font face="monospace"><br> </font></p> <p><font face="monospace">There is the project for Linux called "redirect" that does such stdout/stderr redirection: <a class="moz-txt-link-freetext" href="https://github.com/jerome-pouiller/reredirect/">https://github.com/jerome-pouiller/reredirect/</a></font></p>; <p><font face="monospace">However, it uses ptrace functions that are missing in FreeBSD, like <span style="color:#000000;background-color:#ffffff;">PTRACE_POKEUSER</span>.</font></p> <p><font face="monospace"><br> </font></p> <p><font face="monospace">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?</font></p> <p><font face="monospace"><br> </font></p> <p><font face="monospace">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.<br> </font></p> <p><font face="monospace"><br> </font></p> <p><font face="monospace"><br> </font></p> <p><font face="monospace">Thanks,</font></p> <p><font face="monospace">Yuri</font></p> <p><font face="monospace"><br> </font></p> </body> </html>
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