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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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Node.js detect a child process exit

I am working in node, as it happens via a visual studio code extension. I successfully create child processes and can terminate them on command. I am looking to run code when the process unexpectedly exits, this appears to be what the "exit" event…
edencorbin
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child_process.exec/spawn triggers callback/close with npm install command (via Gulp / Shipit)

I'm using Shipit for deployment. On deploy, Shipit checks out the current Git Sha, to a tmp directory, then I run npm install followed by gulp build, then proceed with the deploy. Shipit uses Orchestrator for it's task flow, as Gulp does. Shipit…
Tim Kelty
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NodeJS batch multi processing - child processes in a pool (or multithreading)

NodeJS batch multi threading processing - child processes in a pool. I know a child process is a process, not a thread. I used wrong semantics, because most people know what your intent is when you speak of "multithreading". So I'll keep it in the…
Redsandro
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How to transfer/stream big data from/to child processes in node.js without using the blocking stdio?

I have a bunch of (child)processes in node.js that need to transfer large amounts of data. When I read the manual it says the the stdio and ipc inferface between them are blocking, so that won't do. I'm looking into using file descriptors but I…
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Script output is buffered into one message, despite separate echo statements?

I have a shell script with three echo statements: echo 'first message' echo 'second message' echo 'third message' I then run this script in node and collect the output via this code: var child =…
temporary_user_name
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Node JS - Cannot Kill Process Executed with Child Process Exec

We are trying to kill the process of a chrome browser launched with nodes child_process exec command var process = cp.exec(`"chrome.exe" --app="..."`, () => {}); // working great But when we try process.kill(); //nothing happens... Does the…
user4602228
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EPIPE error in Node.js

The following code run fine on JPEG, Docx, zip and several other file formats. Then I try is on mpg-filer however, I am hit by a "Error: write EPIPE" that I am unable to debug. Using a try/catch construction also result in an uncaught exception. The…
rlp
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exec vs execFile nodeJs

I want to run a command in command-prompt using nodejs. Based on https://dzone.com/articles/understanding-execfile-spawn-exec-and-fork-in-node, i used child_process.execFile('protractor', ['./src/convertedJs/tempProtractorconfig.js'], (err, stdout,…
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Node.js child process exits with SIGTERM

I'm spawning a child process using Node 6.9. const child = require('child_process').execFile('command', args); child.stdout.on('data', (data) => { console.log('child:', data); }); child.stderr.on('data', (data) => { console.log('child:',…
mitchkman
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NodeJs Error: spawn C:\Windows\system32\cmd.exe; ENOENT

This is my script : var exec = require('child_process').exec; exec('dir', function(error, stdout, stderr) { // 'dir' is for example if (error) { console.error(`exec error: ${error}`); return; } …
Jiohn Dioe
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SIGSEGV from spawn child_process in AWS Lambda function

I'm trying to spawn a synchronous child process (to run ffprobe) in AWS Lambda function, but it dies almost instantly (200ms) with signal SIGSEGV. My understanding of a segmentation fault is that it is a process that is trying to access memory it…
Chris Paton
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Stripe with React JS

I need to create token with Stripe.js in React JS, but I can't find any easy way. In node.js I would do something like this: stripeClient.tokens.create({ card: { number: '4242424242424242', exp_month: 12, exp_year:…
Jan Omacka
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Node.js child processes and pipes - OSX vs Ubuntu

I am trying to get two long running node.js processes to communicate - a parent and a child - using pipes and Node's child-process module. I want the child to be able to send data back to the parent asynchronously, and I was hoping to use a pipe to…
Jacob
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NodeJS: child_process.exec not executing function

I'm attempting to do something I think is very simple -- execute an 'echo' line using child_process.exec. My code looks as such: var exec = require('child_process').exec; exec('echo "HELLO"', function (error, stdout, stderr) { …
streetlight
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Checking if a child process is running

I've built a portal, one of the pages lists releases from Octopus Deploy. However, some information needed about each release is held inside its zip in a data store (shared drive). I currently get releases from Octopus's API then check a mongo db…
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