child-process

问题 Python process forked by NodeJS - Alternative to process.send() for Python? I followed the solution above but doesnt seem to work (no messages are being send by the child python code. Here is my code: const spawn = require('child_process').spawn; var child = spawn('python3', ['child.py'], { stdio:[null, null, null, 'pipe'] }); child.on('message', function(message) { console.log('Received message...'); console.log(message); }); and # !/usr/bin/python3 import os os.write(3, str.encode("HELLO"))

问题 I'm writing a node.js script that permanently runs in the background and initiates file downloads from time to time. I want to use WGET for downloading the files, since it seems more robust until I really know what I'm doing with node.js. The problem is that I want to see the progress of the downloads in question. But I can't find a way to start WGET through node.js in a way that a new shell window is opened and displayed for WGET. Node's exec and spawn functions run external commands in the

问题 Please imagine that some child processes are generated by pcntl_fork() and they open mysql connection using PDO respectively. If parent process send a SIGTERM signal with posix_kill() to a child process, the child process will be killed immediately. So, I have a question about this. When the child process is terminated,will it also close the mysql connection automatically? Or should I call exit() function? I know the child process keep the connection if SIGKILL is sent. However,I don't know

问题 I'm having a weird problem with child process in node.js I have some code running in a child process like this, but the child process exits with code 0 in between lines of synchronous code. var fs = require('fs'); var http = require('http'); var mkdirp = require('mkdirp'); var urlPath = __dirname + "\\urls.txt"; var savePath = __dirname + "\\"; var objects = []; var globalI = 0; var file; if (!fs.existsSync(urlPath)) { console.log("File at " + urlPath + " does not exist!"); } else { if(!fs

问题 I'm trying to run the cURL command to install RVM and ruby via child_process.spawn , but it always errors out: let spawnProcess = spawn('\curl -sSL https://get.rvm.io | bash -s stable --ruby') spawnProcess.stdout.on('data', data => { console.log('DATA RECEIVED') console.log(data) }) spawnProcess.stdout.on('close', () => { alert('done!') }) spawnProcess.stderr.on('data', function(){ console.log('ON DATA') console.log(arguments) }) spawnProcess.on('error', error => { console.log('ON ERROR')

问题 I am writing a bash script in which I wrote a handler to take care of when the user pressed Control+C, (by using trap interruptHandler SIGINT ) but the SIGINT gets sent to both the bash script and the child process that is currently running, closing the child process. How can I prevent this from happening? edit: here's the script, don't critique my skills too much.. #!/bin/bash trap "interruptHandler" SIGINT inInterrupt=false; quit=false; if [ -z ${cachedir+x} ]; then cachedir=~/.cache

问题 I have a static list of "hosts" with their info, and a dynamic list of "host agents". Each host has one and only one agent for as long as it connects to the server by a TCP connection. As the host may or may not be connected, its agent process may or may not be started. When a TCP packet arrives with the host ID, I need to find out if the "agent" of this host is started or not. Connection is responsible for receive and send data from tcp socket, parse the data to find out which host it should

问题 I'm reading a node.js project which includes the child_process library. What exactly is a child process? Is this similar a javascript web worker? What advantages are there to running processes in a child process rather than simply executing it normally? I'm assuming this some how gives you more access to memory? 回答1: When you run terminal on Linux (bash process), and execute a command, for example ls -lh /usr , the terminal starts a child process ls , that writes to stdout all files in the

问题 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 where ve stored information from the zip files ive already accessed so we only have to read the zip files once, the first time they are created. The logic for this currently all works however when it's reading the zip files for the first time it is

问题 I want to open google chrome with nodejs, but I get this error (I used execFile and spawn), code var execFile = require('child_process').execFile, spawn = require('child_process').spawn, spawn('C\\Program Files\\Google\\Chrome\\Application\\chrome.exe', function (error, stdout, stderr) { if (error !== null) { console.log('exec error: ' + error); } }); events.js:72 throw er; // Unhandled 'error' event ^ Error: spawn ENOENT at errnoException (child_process.js:998:11) at Process.ChildProcess.