Questions tagged [process]

A process is a running instance of a program. Use this tag for how Emacs interacts with programs that it runs (compilers, viewers, network backends, etc.)

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Why does calling `term-send-backspace` (just pressing backspace) create a newline in the `*terminal*` buffer in `term-mode`?

Specs: i@debord:~$ emacs --version GNU Emacs 26.3.50 Copyright (C) 2019 Free Software Foundation, Inc. GNU Emacs comes with ABSOLUTELY NO WARRANTY. You may redistribute copies of GNU Emacs under the ...
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1answer
25 views

Process shell exited abnormally with code 53 on windows 10

I'm using emacs 26.2 installed through msys2. Recently starting subprocesses from emacs has stopped working for me. Specifically M-x shell and shell-command-to-string. I get the feeling this is due to ...
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Is it possible to control DTR and/or RTS for a serial process (serial-term)?

I create a serial port process with (serial-term), or the underlying (make-serial-process ...). Is it possible to control the DTR and/or RTS pins for the port from within Emacs? Looking at the source ...
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33 views

Can emacs control other programs windows?

I am using start-process to start other programs as part of my workflow. For example starting a browser to display the HTML file I am working on, or Visual Studio to debug the EXE I just compiled. ...
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Elpy: how to stop the underlying RPC process?

Whenever elpy-mode is activated upon visiting a python file, I see a py.exe executable start, with a subtree of processes. This should be the remote procedure call (thanks @al0 for the explanation). ...
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1answer
52 views

How to pipe data through multiple processes?

Currently I'm generating text from a command, eg: (with-temp-buffer (call-process "my-command" nil t nil "my" "args") ;; operate on output in current buffer. ) How can I use pipes, something ...
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How does one debug errors in a process filter, (setq debug-on-error t) does not pop up a *Backtrace*?

With annoying frequency I get errors in my *Messages* buffer that seem to come from process-filters however, I never get a *Backtrace* for them. So, I have to play around and do similar experiments ...
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1answer
67 views

Get process id for the Emacs own process

I'm supporting some elisp code that creates a temporary filename using a prefix and the user id. When I develop this, that is not enough since I will be running multiple instances concurrently. So I'...
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32 views

Send a command to Emacs from an inferior process

Is it possible to send a command to Emacs from an inferior process? For my particular use-case, I would like to instruct Emacs to run the command inferior-ess-r-reload-hook (part of the ESS package) ...
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145 views

Emacs 26.3 + GnuTLS 3.6.11 does not validate TLS certificates

I am trying to check if the integrated GnuTLS library correctly validates a certificate provided from the server when a TLS connection is established. First, I checked gnutls-cli works fine on my ...
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1answer
22 views

Clojure nrepl: 'cider-jack-in returns error: “Spawning child process: Invalid argument”

Running GNUEmacs 26.3 on Windows 10, trying to set up environment per instructions for 'Clojure for the Brave and True' from here: https://github.com/flyingmachine/emacs-for-clojure/ I was able to ...
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1answer
48 views

how can I change the inferior Python process

I would like to be able to start Python 3 and ipython from Emacs in an inferior mode buffer. Currently start interpreter C-c C-p starts 2.7. I know there must be a way to change to start another ...
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1answer
60 views

How can I query Emacs from a separate process?

I'm interested in tracking how I spend my time at work. I have been using ManicTime, and it does much of what I want. However, I use Emacs as my primary editor, and ManicTime doesn't know how to get ...
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1answer
35 views

Troubleshooting a hanging `list-processes`

Normally I'd use M-x list-processes to see what Emacs is running in the background. But in this case list-processes itself hangs. What is the right thing to do in this situation?
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49 views

Is variable assignment an atomic operation in elisp?

I have a situation in a mode I'm writing that saves a portion of the output of a long-running asynchronous process to a variable at intermittent intervals. I need to access this data periodically. My ...
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1answer
46 views

Lexical binding in a process filter

The code constantly prints server-process: nil instead of the server process name: -*- lexical-binding: t; -*- (let* ((port 1234) (server-process 'something)) (setq server-process (...
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1answer
58 views

“call-process” hangs and does not launch the program

I’m dipping my toes into reading news with Gnus. I’d like to continue using the same editor as before for composing posts, so I put these forms in my gnus.el: (setq message-tab-body-function 'edit-in-...
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1answer
68 views

How can I tell when non-interactive bash process is done executing a command?

I'm trying to write a different shell command line interface where the input line stays at the top. Output of previous commands should stack below: > INPUT LINE LAST OUTPUT (of command 1) ...
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3answers
196 views

How to determine which program is running inside an emacs shell buffer?

I have an emacs shell buffer which may or may not be running a certain interactive program such as ftp or python. I wish to write a lisp function which will interact with this program, but I would ...
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48 views

How can I make multiple calls to external binaries?

I want to write an interactive function to Call an external binary Write the output of the binary into a buffer Process the buffer to extracts args for next call Call another external binary using ...
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1answer
108 views

Send content of region or current line to a tmp file, then execute shell script with filename as argument

I am transitioning to Emacs with evil-mode after years of Vim. For work reasons I have to use a GUI statistics program (Stata) frequently. This program does not integrate well with external editors. ...
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1answer
34 views

Replacement for the sit-for function

Using currently the sit-for function, every time i hit any key and cause user input the sit-for will stop. Is there any possibility to have something like sit-for, while being able to move the cursor ...
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1answer
71 views

How to create shortcut that will kill process for buffer with fixed name

I have code like this to run R command from Emacs: (defun call-r-command (command-list) "run R command in shell buffer window if there is displayed buffer that have shell it will use that window"...
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1answer
69 views

How to partially block user input while Emacs subprocess is running

I have a custom function that updates the etags file before prompting the user to input a desired tag to be located. Although I am pretty good about setting the current buffer to read-only before ...
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1answer
70 views

Launch ncurses application and cleanup once it exits

I'd like to occasionally use hg split and hg commit --interactive from Emacs, but those commands bring up a GUI. At the moment I either use a separate terminal or ansi-term for those, but would like ...
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88 views

How to kill a running process in compilation buffer in MS Windows?

I have tried using M-x kill-compilation and it doesn't kill the process (on Microsoft Windows). It just sends ^C, which makes my script to retry. When I try to M-x kill-buffer on the compilation ...
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32 views

Emacs report a process which does not exist

When start Emacs from the terminal as me@mbp: ~$ emacs --deamon It prompts that However, there does not exist such a pocesses me@mbp~$ ps 8559 PID TTY STAT TIME COMMAND me@mbp:~$ ps -el ...
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1answer
88 views

Open another emacs and cause conflicts

I have a GUI emacs running as the major working area, When I reading articles from web, need to open a emacs as a tool to keep note; Web on the left and new emacs on the right, Usually, get ...
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63 views

Unknown *emacs* process

I recently realized that every time I lunch emacs, after a minute, a strange buffer appear in buffers list that is linked to an emacs process, infact it also appear in system's process list: When I ...
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106 views

How to make process in compilation-mode think it's not running in interactive terminal?

I use minitest-mode which starts Ruby tests in compilation-mode: (compilation-start actual-command 'minitest-compilation-mode (lambda (arg) (minitest-buffer-name (or file-name "")))) Tests invoke ...
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1answer
34 views

External process hangs

I have written a simple Python 3 script: #!/usr/bin/env python3 print('Hello world!') The script works from the shell: $ ./hello-world Hello world! Then, I have written some Lisp to run the ...
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1answer
110 views

Why does :command argument of make-process not work when string passed as a variable? [duplicate]

This works fine: (make-process :name "my-proc2" :buffer " *my-proc2*" :command '("sh" "-c" "echo \"hi\"\nsleep 10\necho \"there\"") :connection-type 'pipe :...
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2answers
578 views

Kill inferior python in python.el mode

At the moment I am killing the Python interpreter with C-d each time I want to quit Python interpreter. What is the name of the function to kill the Python interpreter in Python mode (the one which ...
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1answer
63 views

Inconsistent point in an elisp program and in a visible non-focused process buffer

I am able to collect output data from a process, but I don't understand the coordination of point and process-mark. In particular, the visible cursor in a non-selected window visiting the buffer does ...
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1answer
95 views

Asynchrony when collecting output in a process buffer?

I want to capture output from a process buffer. This is not a duplicate of How do I reliably get output from a process? because that questioner is presupposing comint and an architecture for a ...
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2answers
233 views

shell command on region with process substitution

If I want to execute a shell command on a region I know I can use shell-command-on-region via M-|, what if the command I want to redirect my selection does not accept redirection to it's standard ...
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1answer
33 views

How Can I Prevent make-process from failing if the default-directory doesn't exist?

Usually, when you open a file, Emacs prompts you to run M-x make-directory RET RET if the directory doesn't exist. However, after writing my own advice, I realized that opening files in directories ...
4
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1answer
651 views

Differences between cmdproxy.exe and cmd.exe

What is the difference between: (call-process "cmdproxy" nil "foo" nil "/c" "dir") (call-process "cmd" nil "foo" nil "/c" "dir") ? I seem to get exactly the same results in Emacs 25.1 on ...
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2answers
313 views

Run a process synchronously and obtain stdout and stderr in different buffers?

I'm using emacs version 25.1.1. I would like to run a process synchronously and have its stdout and stderr end up in two different buffers. I know I can use make-process to separate stdout and stderr ...
5
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2answers
551 views

Set environment variables for spawned subprocesses

I would like to set the environment variables for a spawned subprocess only. They are controlled by process-environment. The documentation says: binding that variable with let is also reasonable ...
2
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1answer
71 views

What's the idiomatic way of writing an Emacs front-end to a command which supports streaming input and output like Telnet?

I would like to write an Emacs front-end to a server which supports Telnet connections, and I was wondering if there is an idiomatic way of doing this. Specifically, the program will work like this: ...
2
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1answer
1k views

Error in process filter

I am trying to play with the make-process function and get information from it. I am getting some errors in my process filter that I am having trouble understanding. When I run my ceedling-version ...
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0answers
404 views

How to get process name (or process) from PID in lisp?

I would like to check if my shell is running ssh or not by checking the process name. I tried to get the process name by: (let* ((proc (get-process "shell")) (proc-child-id (process-running-child-p ...
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1answer
296 views

Process input seems buggy in Emacs on OS X

I have a process that I'm trying to send input to on OS X. I'm using Emacs' builtin functions for doing this: process-send-string and process-send-region. However, it seems that there are issues when ...
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1answer
52 views

Can I merge the buffers opened in one emacs process into the other emacs process?

In bash in a terminal emulator, I run two independent emacs processes. I created them in bash by emacs -nw and in each, I opened several buffers. I switch between them by making one process into ...
5
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1answer
236 views

Asynchronous version of shell-command-on-region?

I have a problem which is very similar to this one. I have some text that I'd like to listen to with macOS's say utility. Unfortunately, Emacs locks up when I use shell-command-on-region because it is ...
4
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0answers
809 views

Run interactive shell script in new buffer using elisp

I am looking for a way to display and interact with long running shell scripts in a separate buffer. While using eshell works, I'd like to automate most shell tasks using elisp. The best way I came ...
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0answers
55 views

Running a single Emacs instance

I'd like to set in my dot-emacs a function to detect if an Emacs instance is already running, possibly exiting Emacs informing user. To do this I should query the OS for running processes. However (...
4
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1answer
269 views

Shell coding system

If, before M-x shell, I run C-x RET c (universal-coding-system-argument) I can change the coding system used by the shell. Therefore, given echo Straße > foo foo will be encoded in the related ...
2
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1answer
296 views

Interpolate environment variables in string

I am trying to write a function that will interpolate the enviroment variables stored in process-environment in a string. For example, if I have the string "This is $Foo and ${Bar}_none and '$skip'" ...