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Questions tagged [child-process]

For questions regarding child-process

In Unix, a child process is typically created as a copy of the parent, using the fork system call. The child process can then overlay itself with a different program (using exec) as required.

Each process may create many child processes but will have at most one parent process; if a process does not have a parent this usually indicates that it was created directly by the kernel.

The inter communication between a child process and a parent process can be done through normal communication schemes such as pipes, sockets, message queues, shared memories.

When a child process terminates, some information is returned to the parent process. When a child process terminates before the parent has called wait, the kernel retains some information about the process, such as its exit status, to enable its parent to call wait later

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Problems with exiting from CLI

I've created simple CLI using inquirer and child_process. And i have problem, when i'am closing process with CTLR+C, it seems like its still running process, because terminal not responding anything. And i have to close terminal every time and open…
Hanzo Hattori
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Child Process prints normal outputs from stderror while using Pacman -U

The problem is basically, child process prints normal outputs as errors and I think that causes to something being stopped. ERROR 1 ==> WARNING: A package has already been built, installing existing package... [sudo] password for user: // That…
rch
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Not able to run child process in node kafka consumer

const { spawn } = require('child_process'); const child = spawn('dir', ['./kafka'], { shell: true }); child.stdout.on('data', (data) => { console.log("child process started"); }); child.stderr.on('data', (data) => { console.error("failed to…
Arush Saxena
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How to prevent a infinite loop in nodejs child process spwan

I'm building an online ide by running the command to execute the code by spawn... but what should I do if there is an infinite loop in the code...The process is not being stopped const { childElements } = require("dom-helpers"); const path =…
Aditya Harsh
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Python-shell problem after packaging my app with electron builder (Node Js)

I finished my electron/node js & Python app (a steganography tool). So I'd like to package it to distribute it on github with a dmg, exe... So I installed electron-builder as my packager but when i package my app by taping: npm run dist or yarn run…
Xam Mlr
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ExpressJs spawn new CPU intensive task on request

This is a system architecture design question, so I'm not sure if it fits here. Excuse me if it doesn't and feel free to suggest the appropriate community. I have an ExpressJs server and a Python script that runs a CPU intensive task, typically it…
Mike Pham
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node.js second spawned child process doesn't receive stdin messages

I have an event in my node.js script which need to be called multiple times that spawns a child process. Not parallel just one child process at the time. var child = spawn('node', [script, arg1],{cwd: "./", stdio: …
Warmduscher
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Spawning top with arguments and parsing with grep

I want to spawn top with a few arguments to get the current cpu load & usage. If I type the full command on my ssh session top -bn1 | grep "Cpu(s)\|top -", I get the complete and working response. But how is the correct way to spawn this command…
borsTiHD
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C/bash: signal one process on the death of another

Think of this as a continuation of the good advice here: https://stackoverflow.com/a/56780616/16739703 except that I am hoping not to modify the child process. Edit: I have written code which minimises to: #include #include…
JamesC1
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Node child process spawn not executing command

I am trying to execute a child process command to convert a file from a format to another using FFmpeg. I have FFmpeg installed in my system and in the same code I am able to successfully merge a video and a file using cp.spawn. The next step would…
Daniel
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Can I run nodejs child-process (command line) in heroku?

I have created an app.js file that tries to run node span child-process. With that child process I tried to run mongodump (mongodb utility to create backups). In my local computer that codes works but in my node server in heroku the code fails and…
Rupak
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NodeJs synchronous child process

I'm trying to build a certificate generation module using nodeJS. The api to create certificate is as follows // Create certificate const express = require('express'); const router = express.Router(); const { createCanvas } =…
sheetaldharerao
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not able to kill process in node.js

I am working on a node script where I will be opening and closing the browser using child process but its opening the browser but not able to close it on pressing Ctrl + C. Here's my code: const { kill } = require('process'); var start =…
rudeTool
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How to exit the child process in javascript?

I am working on a node.js project where I have to define different endpoints to open and close browsers on specific endpoints. Like on: localhost:3000/open---> opens the browser localhost:3000/close---> closes the browser I have made child process…
rudeTool
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Why is Puppeteer not displayed as a child process on IIS?

I have a node.js server which runs a child process on the server when the user requests. This child process is managed by npm package 'child_process' and running a 'Puppeteer' script. The whole process works as expected on local. The problem is when…
daniron93
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