running script in background active tty
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From: "Brian K. White" <email@example.com> Newsgroups: comp.unix.sco.misc Subject: Re: Cant run program in background Date: Tue, 03 Oct 2000 18:55:58 -0400 Message-ID: <39DA63FE.F407DDF5@squonk.net> References: <adsC5.870$R04.firstname.lastname@example.org> Cache-Post-Path: email@example.com Fabio Giannotti wrote: > > On 5.0.5, I have a ELF 32-bit LSB executable (tin) that seems to not want to > work unless it is on an active tty. > > If I try to run the program in the background (using &), I get: > > select() failed: Error: Invalid arguement > > Is there a way to "fool" it into thinking it is on an active tty? > (Ultimately, I want to run this in cron.) > > Thanks in advance, > Fabio *maybe* with expect (see skunkware) maybe with nohup (standard command)
and/or maybe by simply redirecting one or more of fd's 0, 1, and 2. explanation: maybe when a program goes into the background it just closes 0 (stdin), 1(stdout), and 2 (errout) and so you can't call select() on nothing. so maybe if you supply someting for select() to act on that will be good enough. so perhaps just tuoch a couple files progin, progout and run with prog 0<progin >progout 2>&1 or perhaps use an existing but always unused tty disable tty06 prog </dev/tty06 >/dev/tty06 2>/dev/tty06 (I just tried this with a simple "more" command and it didn't quite work as I'd hoped. it displayed the output on tty06, but didn't accept any keystrokes from tty06 or anywhere else, had to kill -HUP the process. but something like this might still get you program to run if you don't need to send it any keystrokes anyways. or you could store the input in a regular file and do prog <file >/dev/tty06 2>&1 I think linux has a command for running a program on a particular tty instead of the current one, something like "vcopen" , anyone know of a sco equivalent? -- Brian K. White http://www.squonk.net/users/linut +++++[>+++[>+++++>+++++++<<-]<-]>>+.>.+++++.+++++++.-.[>+<---]>++. filePro BBx Linux SCO Prosper/FACTS AutoCAD #callahans Satriani
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