child-process | driven library for executing child processes | Reactive Programming library
kandi X-RAY | child-process Summary
kandi X-RAY | child-process Summary
Event-driven library for executing child processes with ReactPHP. This library integrates Program Execution with the EventLoop. Child processes launched may be signaled and will emit an exit event upon termination. Additionally, process I/O streams (i.e. STDIN, STDOUT, STDERR) are exposed as Streams.
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Top functions reviewed by kandi - BETA
- Starts the process .
- Closes the process .
- Updates the status of the process .
- Poll the exit code .
- Returns true if the sigchild is enabled .
- Terminates the process .
- Determine if the process is running .
- Close the exit code pipe .
- Returns the current status .
- Check if session is stopped
child-process Key Features
child-process Examples and Code Snippets
Lines of Code : 7
License : No License
Copyimport {execa} from 'execa';
const subprocess = execa('echo', ['foo']);
subprocess.stdout.pipe(process.stdout);
const {stdout} = await subprocess;
console.log('child output:', stdout);
import {execa} from 'execa';
execa('echo', ['unicorns']).stdout.pipe(process.stdout);
function spawn(
cmd: string,
args: Array,
opts: SpawnOptions = {}
) {
return limit(
() =>
new Promise((resolve, reject) => {
let stdoutBuf = Buffer.from('');
let stderrBuf = Buffer.from('');
let isTTY = def _if_spawn_run_and_exit():
"""If spawned process, run requested spawn task and exit. Else a no-op."""
# `multiprocessing` module passes a script "from multiprocessing.x import y"
# to subprocess, followed by a main function call. We use thi public static void outputStreamDemo() throws IOException, InterruptedException {
Logger log = Logger.getLogger(ProcessUnderstanding.class.getName());
Process pr = Runtime.getRuntime()
.exec("javac -cp src src\\main\\java\\ Community Discussions
Trending Discussions on child-process
QUESTION
I'm trying to interact with an external command (in this case, exiftool) and reading the output byte by byte as in the example below. While I can get it to work if I'm willing to first read in all the output and wait for the child process to finish, using a BufReader seems to result in indefinitely waiting for the first byte. I used this example as reference for accessing stdout with a BufReader.
...ANSWER
Answered 2021-May-23 at 13:02You're not closing the child's stdin. Your stdin variable is a mutable reference, and dropping that has no effect on the referenced ChildStdin.
Use child.stdin.take() instead of child.stdin.as_mut():
QUESTION
var promise = require('child-process-promise').spawn;
promise('some_command_producing_output')
.then(function (result) {
...
})
.catch(function (err) {
...
});
ANSWER
Answered 2021-Apr-03 at 13:41You can do it by
QUESTION
If you try running this code:
...ANSWER
Answered 2021-Apr-03 at 11:47One way (I think the only practical way) of solving this problem is to come up with a managed random number generator class that you can pass to your worker function as an argument (the option chosen here) or used to initialize each process in the pool as a global variable. I have modified your code slightly so that instead of printing the random number, function do_thing returns the value and I have also modified the main process to create a pool size of 8 and to invoke do_thing 8 times. Finally, to ensure that all 8 processors each process one submitted task (I have 8 cores) instead of the first process processing all 8 tasks, which is a possibility when the job submitted completes very quickly, I have added a call to sleep to do_thing:
QUESTION
I'm building a chrome extension using typescript and webpack and started experiencing a few errors after introducing a recently release node module into my project.
The module I installed: https://github.com/gregtuc/StockSocket
The error appears in the browser when I load my extension
...ANSWER
Answered 2021-Mar-10 at 04:13The module you have chosen, StockSocket, is meant to be used in a Node.js environment and not a web browser. The errors with ‘fs’, ‘childprocess’, etc arise because StockSocket itself (of one of its dependencies) use these modules which are builtin in Node and not the browser.
Looking at the source code briefly for StockSocket, it uses puppeteer which is a node.js library for controlling a headless webbrowser. This makes StockSocket a poor fit for a browser extension. I’d have a look at the source code for StockSocket and see if you can replicate some of the behavior using browser APIs!
QUESTION
My child process is exiting after about 30 minutes with SIGTERM and no other debug output. Given the information on Node.js child process exits with SIGTERM, I think it's reasonably likely that the process is exiting due to exceeding its maxBuffer, as the uptime is non-deterministic and indeed is improved by increasing the maxBuffer. With the default 205 KB of maxBuffer, it consistently runs for 1-3 minutes; and with 10 MB, it consistently runs for 30-60 minutes.
The child process is producing a stream of text at an average rate of about 1 MB every 10 minutes (1.66 KB per second).
The log entries in the text stream are multi-line (see sample below of the lines that make up one log entry), so I am using Node to parse them line-by-line to extract the information of interest (from * << Request >> to - End ):
ANSWER
Answered 2021-Feb-26 at 18:50I searched the Node.js codebase's tests for mentions of maxBuffer and found one that shows how to diagnose that a child process exited due to exceeding its allotted maxBuffer, which I'll copy out here:
QUESTION
I'm working on Windows 10.
Here's my code based on this document:
Creating a Child Process with Redirected Input and Output
Here is the code of the Parent process (I have modified only CreateChildProcess(). The rest are the same):
ANSWER
Answered 2021-Feb-11 at 04:09Because you redirect the input handle of the child process to the pipe through the following code:
QUESTION
Within an electron.js app I'm trying to call and execute a python script from node.js based on the these indicatins: https://nodejs.org/api/child_process.html#child_process_child_process_execfile_file_args_options_callback
...ANSWER
Answered 2021-Jan-20 at 22:04Seems that your problem is that you're using webpack < 5 and copy-webpack-plugin 7 which aren't compatibles.
Just do :
QUESTION
I am trying to add a watermark over the a video in firebase storage using firebase functions and ffmpeg, but no matter what I try it always exit the same error.
...ANSWER
Answered 2021-Jan-10 at 20:52After many tries, I found that this will work if I passed the "overlay=10:10" through a variable and not directly, this code worked for me.
QUESTION
I am using CentOS 7 server, node version 10.23.0, child-process version 6.14.9 and I should watch the status of the given services.
For that, I'm using Childprocess.exec function in format systemctl status servicename. This command is working properly when service is active, but giving an error when service is inactive. In command line, despite status of the service, all is working good.
I've tried to use systemctl is-active servicename but there is also error. I don't know what is the reason. Error message is
ANSWER
Answered 2020-Dec-08 at 22:04Systemctl's exit codes are documented in man systemctl as:
QUESTION
ANSWER
Answered 2020-Nov-29 at 22:32You await your function, but that function is not really async. When a function has async keyword before it, what it actually does is wrap the whole function to Promise instance. But if you won't handle what is inside this function correctly, it won't work.
In your case, you need return Promise instance manually. It accepts callback with resolve & reject arguments. And you can call resolve to resolve the promise:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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