If it's broken... The top level definition for 2!:2 is at https://github.com/jsoftware/jsource/blob/master/jsrc/x.c#L90
(And, remember, line 4 of those .c files identifies the purpose of the file. And, in the current versions, if you can't find a function definition, try pasting a "jt" at the front of the name, because there's a bunch of defines set up for that abstraction). Anyways, the implementation itself is at the bottom of xh.c -- https://github.com/jsoftware/jsource/blob/master/jsrc/xh.c#L146 If it doesn't work on linux, it should be easy enough to submit a pull request with a description of the details of the issue and a fix for it. (If you're new to the source code, you can use cpp or gcc -E to expand the macros to get an idea about where to focus your attention. Expect to skip over a lot of garbage if you use this, of course...) Thanks, -- Raul On Mon, Mar 5, 2018 at 5:15 AM, bill lam <bbill....@gmail.com> wrote: > Last time check, those foreign conjunctions did not work under linux. It > was a long standing bug but not fixed. > > On Mon, Mar 5, 2018, 5:16 PM Nick S <simic...@gmail.com> wrote: > >> ssh can be run without pty allocation, the remote command can just be run >> under pipes, for openssh, the option is -T if I read the manual pages >> correctly. The real question is whether the program you want to run >> remotely needs a pty (Or the signal processing changes you can get from the >> pry). Certainly most of the oldstyle tools run fine without a pty - bash, >> ssh itself, grep, sed, and so forth don't need a pty. vi and such >> might...but many such tools have a paper tty mode left over from the dark >> ages when the TI Silent 700 was an advanced terminal. And that means no >> curses, no pty needed. The rule, to me, is that if the command will run in >> a pipeline where it gets its input from a pipe and the output can go to a >> pipe, it probably runs without caring about a pty. >> >> >> >> In my former life I did a metric ton of using ssh to run remote commands >> under program control to provide secure remote access to programs/systems >> while minimizing the chance of intercept. Centralized security logging, for >> example. So the real question is not about ptys and scraping full screen >> programs. >> >> The real question is, can I get a filehandle for stdin, stdout, and stderr >> and then use the appropriate file I/O primitives to send data to the remote >> process and get data from the process. >> >> My guess is that, under the covers, 2!:2 is used to create the ssh >> co-process. The raw foreign doc says it returns filehandles that are bound >> to standard input, output and error. If you can't get what you want from >> the library, well, most of the foreign primitives are not so hard to use >> directly. >> >> Do remember that this sort of co-process creation is only supported on >> Unix. You may not care whether your program runs under android or Windows, >> but this makes it non-portable. Yes, I think it is a bad thing that >> Windows does not support the native Unix process structure as a standard >> optional thing. There was movement that way for a bit, but that was >> abandoned, I think. It might run under cygwin. >> >> >> >> On Mar 3, 2018 08:15, "Raul Miller" <rauldmil...@gmail.com> wrote: >> >> You are correct. >> >> There is a lot of OS specific code needed for PTYs, and most everyone >> has other higher priorities than working through all those issues. >> >> Thanks, >> >> -- >> Raul >> >> On Sat, Mar 3, 2018 at 6:30 AM, Omar Passos Torres de Almeida >> <omar...@gmail.com> wrote: >> > Thanks! >> > I know those technics, but i was thinking in something coded in pure J or >> > some addon. I think not exists something like those in J. >> > >> > Omar >> > >> > >> > On 03/02/2018 11:25 PM, Raul Miller wrote: >> >> >> >> Working with ptys is kind of tricky, you'll want a program that >> >> specializes in that, like expect or maybe even something like tmux. >> >> >> >> https://en.wikipedia.org/wiki/Expect >> >> >> >> https://en.wikipedia.org/wiki/Tmux >> >> >> >> If you're working with tmux, for example, you can use tmux send-keys >> >> to "type" things into your ssh session. >> >> https://ricochen.wordpress.com/2011/11/14/tmux-techniques-by-example/ >> >> looks like it has some plausible examples of this. >> >> >> >> I hope this helps, >> >> >> > >> > ---------------------------------------------------------------------- >> > For information about J forums see http://www.jsoftware.com/forums.htm >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
