[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Using file descriptors in Emacs

From: Eli Zaretskii
Subject: Re: Using file descriptors in Emacs
Date: Sun, 11 Sep 2016 19:39:06 +0300

> From: address@hidden
> Date: Sun, 11 Sep 2016 12:00:21 -0400
> I suppose one could add the capability to pass in a process object as
> the source of input for a new process object. This could be implemented
> by forcing the passed-in process object to a state where it does not
> have (and cannot have) a process-filter function. Then the file
> descriptor used for input to the passed-in process object could be
> manipulated appropriately to make it the stdin of the new process
> object. The new process object in turn will be in a special state where
> it cannot accept input from Emacs.
> Likewise for the capability to pass in a process object as the
> destination for a program's output, instead of a process-filter, and the
> capability to redirect arbitrary file descriptor numbers to point at
> process objects (or other file descriptors).
> Then also it is necessary to handle redirecting to and from files
> without going through Emacs. That could be done by creating a new kind
> of process object which is created by opening a file, and then that can
> be passed in in the way I describe above.

Yes, something like that.

> But to me that sounds somewhat unnatural for the process API.

To me it sounds most natural.  All of our APIs in this area are like

> Are those the kind of extensions you were envisioning?


Btw, running a pipe of processes raises another issue, unrelated to
file descriptors: we would need a way to make sure the processes do
not start running until all the redirections are set up, otherwise
some of them will die with SIGPIPE or somesuch.

reply via email to

[Prev in Thread] Current Thread [Next in Thread]