Date: Sat, 13 Mar 1999 11:18:04 -0500 (EST) From: Spike <spork@startrekmail.com> To: "Ben J. Cohen" <bjc23@hermes.cam.ac.uk> Cc: sporkl@ix.netcom.com, questions@FreeBSD.ORG Subject: Re: Redirection of processes and of X clients Message-ID: <Pine.BSF.4.05.9903131115400.626-100000@nyc-ny77-30.ix.netcom.com> In-Reply-To: <Pine.BSF.4.05.9903131614090.257-100000@bjc23.trin.cam.ac.uk>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sat, 13 Mar 1999, Ben J. Cohen wrote: > On Sat, 13 Mar 1999, Spike wrote: > >On Sat, 13 Mar 1999, Ben J. Cohen wrote: > > >> Firstly, is it possible to change the terminal a program is attached to > >> while it is running? > >> > >> For example, if I am running talk, is it possible to move the program from > >> ttyp2 to ttyv1 on the same machine (e.g. prior to shutting X down if I > >> don't want to lose the connection)? > >> > >> I don't know how this might be achieved, but I know that if you have a > >> program in the background, kill -SIGCONT pid will make it run in the > >> foreground (in some sense). > >> However, I don't see how to apply this in the case where a program is > >> attached to a terminal. > > > >I don't believe what you want is at easily feasible. A process sent to the > >background is still attached to your terminal. What you want to do is set > >the STDIN, STDOUT, and STDERR file descriptors to a different terminal. > >Unless the program supports the ability to reassign its STD* file > >descriptors, I don't think you can do this. > > That is basically what I want to do. > Does the program which is being "moved" have to support the reassignment > or is it sufficient to get another program to do it? I suppose you could make a program that would run a second program with that second program's STD* file descriptors pointing at the first program, and then the first program would wait for, SIGUSR1, or specific user input, and then accept a filename to re-direct it's STD* file descriptors to and therefor the second program's as well. It shouldn't be that hard to write, but I'm not very good with C. I think I will give it a try though. Don't expect too much. > > Is there a program (or can one feasibly be written) which does this? > > > Thanks, > > Ben. > > > -Spike Gronim sporkl@ix.netcom.com Finger gronimw@shell.stuy.edu for PGP public key. The majority only rules those who let them. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSF.4.05.9903131115400.626-100000>