Comments on: Redirecting Output from a Running Process

By: Pradnesh

Pradnesh — Mon, 08 Dec 2008 22:59:44 +0000

Hi,
I tried this…closed all open handles…opened the new ones to new device — “/dev/pts/4″
and then called setsid();
my setsid() is always returning -1.
Please help…

thanks,
Pradnesh

By: wilq

wilq — Fri, 18 Jul 2008 23:51:03 +0000

This method doesn’t work for me – when I try to redirect command “cat” to another controlling tty (e.g. from pts/2 to tty1). I do the steps exactly as described above, but finally setsid() returns -1 , and if I (before quitting from gdb) run “ps aux|grep cat” it still indicates the old tty. And what is worse, – right after I quit from gdb (q), “cat” procsess immediately dies. So I think it’s not enough just to change all file descriptors of ttys used by cat, it’s also necessary to change somehow controlling tty, so that “ps aux|grep cat” would show the new tty, rather than old one.
What do I wrong ? Please help.

By: etbe

etbe — Mon, 07 Apr 2008 12:21:23 +0000

http://sourceforge.net/projects/dmtcp

The above SourceForge project seems to do similar things to CryoPID, and they are working on suspending the state of a cluster too.

By: etbe

etbe — Tue, 04 Mar 2008 23:34:54 +0000

http://cryopid.berlios.de/
CryoPID allows suspending the state of a running process via ptrace and then restarting it later (after a reboot etc).

http://www.fazlamesai.net/?a=article&sid=4951
Thanks to the above blog post for pointing this out.

By: Todd Troxell

Todd Troxell — Wed, 27 Feb 2008 20:15:44 +0000

Awesome– I had no idea gdb could run function calls!

By: Russell Coker : redirecting output from a running process | vanimpe.eu

Russell Coker : redirecting output from a running process | vanimpe.eu — Wed, 27 Feb 2008 13:15:20 +0000

[...] log out. Of course, you’ve forgotten to use screen so when you log out, the process dies. The post by Rusell Coker shows that it is still possible to redirect the output of a running process. The [...]