July 2009 - WLUG - wlug.mailman3.com

Re: [Wlug] Making a pipe or socket look like a file.

by J. R. Mauro

On Jun 30, 2009, at 22:47, Alex Camilo <alex.camilo(a)gmail.com> wrote: > I'm thinking fuse might work. I'l look into working with fuse in It's dead simple, even in C. And then you can have a bunch of files for specific tasks > > python when I get to a real computer. Thanks! > > > > On Jun 30, 2009, at 10:35 PM, "J. R. Mauro" <jrm8005(a)gmail.com> wrote: > >> >> >> >> >> On Jun 30, 2009, at 22:24, Mike Frysinger <vapier(a)gentoo.org> wrote: >> >>> On Tuesday 30 June 2009 21:47:18 J. R. Mauro wrote: >>> >>> please dont top post >> >> Who did? >> >>> >>> >>>> On Jun 30, 2009, at 21:42, Alex Camilo <alex.camilo(a)gmail.com> >>>> wrote: >>>>> I'm trying to extend the functionality of a piece of CAD software >>>>> i'm using. The software package is called eagle and it has a >>>>> custom >>>>> in application scripting language that allows you to access an >>>>> open >>>>> CAD document by manipulating a tree of objects. The scripting >>>>> language is fairly limited when it comes to talking to the outside >>>>> world and only offers rudimentary file IO. I was wondering if any >>>>> of >>>>> you know how to make one end of a unix socket look like a file? >>>> >>>> Unfortunately, you can't. It's one of the design flaws of Unix. You >>>> might be able to wrap it with a FUSE filesystem. But sockets and >>>> FIFOs >>>> are unfortunately "special" >>> >>> i imagine you could use netcat to redirect from a named pipe so that >>> you can >> >> FIFOs are kind of a hack. Make a fuse filesystem in 20 lines of >> python >> and you get something more robust and specialized, plus network >> transparency for free >> >>> >>> read/write via the network ... seems to work for me >>> >>> $ mkfifo fifo >>> shell 1: $ nc -l -p 12345 localhost > fifo >>> shell 2: $ cat fifo >>> shell 3: $ nc localhost 12345 >>> -mike >> _______________________________________________ >> Wlug mailing list >> Wlug(a)mail.wlug.org >> http://mail.wlug.org/mailman/listinfo/wlug > _______________________________________________ > Wlug mailing list > Wlug(a)mail.wlug.org > http://mail.wlug.org/mailman/listinfo/wlug

July 1, 2009

Re: [Wlug] Making a pipe or socket look like a file.

by Alex Camilo

I'm thinking fuse might work. I'l look into working with fuse in python when I get to a real computer. Thanks! On Jun 30, 2009, at 10:35 PM, "J. R. Mauro" <jrm8005(a)gmail.com> wrote: > > > > > On Jun 30, 2009, at 22:24, Mike Frysinger <vapier(a)gentoo.org> wrote: > >> On Tuesday 30 June 2009 21:47:18 J. R. Mauro wrote: >> >> please dont top post > > Who did? > >> >> >>> On Jun 30, 2009, at 21:42, Alex Camilo <alex.camilo(a)gmail.com> >>> wrote: >>>> I'm trying to extend the functionality of a piece of CAD software >>>> i'm using. The software package is called eagle and it has a custom >>>> in application scripting language that allows you to access an open >>>> CAD document by manipulating a tree of objects. The scripting >>>> language is fairly limited when it comes to talking to the outside >>>> world and only offers rudimentary file IO. I was wondering if any >>>> of >>>> you know how to make one end of a unix socket look like a file? >>> >>> Unfortunately, you can't. It's one of the design flaws of Unix. You >>> might be able to wrap it with a FUSE filesystem. But sockets and >>> FIFOs >>> are unfortunately "special" >> >> i imagine you could use netcat to redirect from a named pipe so that >> you can > > FIFOs are kind of a hack. Make a fuse filesystem in 20 lines of python > and you get something more robust and specialized, plus network > transparency for free > >> >> read/write via the network ... seems to work for me >> >> $ mkfifo fifo >> shell 1: $ nc -l -p 12345 localhost > fifo >> shell 2: $ cat fifo >> shell 3: $ nc localhost 12345 >> -mike > _______________________________________________ > Wlug mailing list > Wlug(a)mail.wlug.org > http://mail.wlug.org/mailman/listinfo/wlug

July 1, 2009

Re: [Wlug] Making a pipe or socket look like a file.

by J. R. Mauro

On Jun 30, 2009, at 22:24, Mike Frysinger <vapier(a)gentoo.org> wrote: > On Tuesday 30 June 2009 21:47:18 J. R. Mauro wrote: > > please dont top post Who did? > > >> On Jun 30, 2009, at 21:42, Alex Camilo <alex.camilo(a)gmail.com> wrote: >>> I'm trying to extend the functionality of a piece of CAD software >>> i'm using. The software package is called eagle and it has a custom >>> in application scripting language that allows you to access an open >>> CAD document by manipulating a tree of objects. The scripting >>> language is fairly limited when it comes to talking to the outside >>> world and only offers rudimentary file IO. I was wondering if any of >>> you know how to make one end of a unix socket look like a file? >> >> Unfortunately, you can't. It's one of the design flaws of Unix. You >> might be able to wrap it with a FUSE filesystem. But sockets and >> FIFOs >> are unfortunately "special" > > i imagine you could use netcat to redirect from a named pipe so that > you can FIFOs are kind of a hack. Make a fuse filesystem in 20 lines of python and you get something more robust and specialized, plus network transparency for free > > read/write via the network ... seems to work for me > > $ mkfifo fifo > shell 1: $ nc -l -p 12345 localhost > fifo > shell 2: $ cat fifo > shell 3: $ nc localhost 12345 > -mike

July 1, 2009

Re: [Wlug] Making a pipe or socket look like a file.

by Mike Frysinger

On Tuesday 30 June 2009 21:47:18 J. R. Mauro wrote: please dont top post > On Jun 30, 2009, at 21:42, Alex Camilo <alex.camilo(a)gmail.com> wrote: > > I'm trying to extend the functionality of a piece of CAD software > > i'm using. The software package is called eagle and it has a custom > > in application scripting language that allows you to access an open > > CAD document by manipulating a tree of objects. The scripting > > language is fairly limited when it comes to talking to the outside > > world and only offers rudimentary file IO. I was wondering if any of > > you know how to make one end of a unix socket look like a file? > > Unfortunately, you can't. It's one of the design flaws of Unix. You > might be able to wrap it with a FUSE filesystem. But sockets and FIFOs > are unfortunately "special" i imagine you could use netcat to redirect from a named pipe so that you can read/write via the network ... seems to work for me $ mkfifo fifo shell 1: $ nc -l -p 12345 localhost > fifo shell 2: $ cat fifo shell 3: $ nc localhost 12345 -mike

July 1, 2009

Re: [Wlug] Making a pipe or socket look like a file.

by Scott Venier

J. R. Mauro wrote: > Unfortunately, you can't. It's one of the design flaws of Unix. You > might be able to wrap it with a FUSE filesystem. But sockets and FIFOs are > unfortunately "special" > FIFOs do exist in the filesystem (see mkfifo(3)), but they're only unidirectional. If you want bidirectional, either need a pair of FIFOs, or as a bit of a hack, you could have your external process open up a unix socket and write the fd number and it's PID into some pre-arranged file (say, /tmp/<username>/eagle/socket_location). Your script could then open that file, and use the information to construct a path to /proc/<PID>/fd/<fd> and access the socket as a file that way. Or, I suppose you could simplify the script side by making that pre-arranged file into a symlink to /proc/<PID>/fd/<fd>. Scott

July 1, 2009

Re: [Wlug] Making a pipe or socket look like a file.

by J. R. Mauro

Unfortunately, you can't. It's one of the design flaws of Unix. You might be able to wrap it with a FUSE filesystem. But sockets and FIFOs are unfortunately "special" On Jun 30, 2009, at 21:42, Alex Camilo <alex.camilo(a)gmail.com> wrote: > I'm trying to extend the functionality of a piece of CAD software > i'm using. The software package is called eagle and it has a custom > in application scripting language that allows you to access an open > CAD document by manipulating a tree of objects. The scripting > language is fairly limited when it comes to talking to the outside > world and only offers rudimentary file IO. I was wondering if any of > you know how to make one end of a unix socket look like a file? > _______________________________________________ > Wlug mailing list > Wlug(a)mail.wlug.org > http://mail.wlug.org/mailman/listinfo/wlug

July 1, 2009

Making a pipe or socket look like a file.

by Alex Camilo

I'm trying to extend the functionality of a piece of CAD software i'm using. The software package is called eagle and it has a custom in application scripting language that allows you to access an open CAD document by manipulating a tree of objects. The scripting language is fairly limited when it comes to talking to the outside world and only offers rudimentary file IO. I was wondering if any of you know how to make one end of a unix socket look like a file?

July 1, 2009