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processTree.ts
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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*
* Copied from https://github.com/microsoft/vscode-node-debug/blob/master/src/node/extension/processTree.ts
*--------------------------------------------------------------------------------------------*/
/* tslint:disable */
'use strict';
import { spawn, ChildProcessWithoutNullStreams } from 'child_process';
import { join } from 'path';
export class ProcessTreeNode {
children?: ProcessTreeNode[];
constructor(public pid: number, public ppid: number, public command: string, public args: string) {
}
}
export async function getProcessTree(rootPid: number) : Promise<ProcessTreeNode | undefined> {
const map = new Map<number, ProcessTreeNode>();
map.set(0, new ProcessTreeNode(0, 0, '???', ''));
try {
await getProcesses((pid: number, ppid: number, command: string, args: string) => {
if (pid !== ppid) {
map.set(pid, new ProcessTreeNode(pid, ppid, command, args));
}
});
} catch (err) {
return undefined;
}
const values = map.values();
for (const p of values) {
const parent = map.get(p.ppid);
if (parent && parent !== p) {
if (!parent.children) {
parent.children = [];
}
parent.children.push(p);
}
}
if (!isNaN(rootPid) && rootPid > 0) {
return map.get(rootPid);
}
return map.get(0);
}
export function getProcesses(one: (pid: number, ppid: number, command: string, args: string, date?: number) => void) : Promise<void> {
// returns a function that aggregates chunks of data until one or more complete lines are received and passes them to a callback.
function lines(callback: (a: string) => void) {
let unfinished = ''; // unfinished last line of chunk
return (data: string | Buffer) => {
const lines = data.toString().split(/\r?\n/);
const finishedLines = lines.slice(0, lines.length - 1);
finishedLines[0] = unfinished + finishedLines[0]; // complete previous unfinished line
unfinished = lines[lines.length - 1]; // remember unfinished last line of this chunk for next round
for (const s of finishedLines) {
callback(s);
}
};
}
return new Promise((resolve, reject) => {
let proc: ChildProcessWithoutNullStreams;
if (process.platform === 'win32') {
// attributes columns are in alphabetic order!
const CMD_PAT = /^(.*)\s+([0-9]+)\.[0-9]+[+-][0-9]+\s+([0-9]+)\s+([0-9]+)$/;
const wmic = join(process.env['WINDIR'] || 'C:\\Windows', 'System32', 'wbem', 'WMIC.exe');
proc = spawn(wmic, [ 'process', 'get', 'CommandLine,CreationDate,ParentProcessId,ProcessId' ]);
proc.stdout.setEncoding('utf8');
proc.stdout.on('data', lines(line => {
let matches = CMD_PAT.exec(line.trim());
if (matches && matches.length === 5) {
const pid = Number(matches[4]);
const ppid = Number(matches[3]);
const date = Number(matches[2]);
let args = matches[1].trim();
if (!isNaN(pid) && !isNaN(ppid) && args) {
let command = args;
if (args[0] === '"') {
const end = args.indexOf('"', 1);
if (end > 0) {
command = args.substr(1, end-1);
args = args.substr(end + 2);
}
} else {
const end = args.indexOf(' ');
if (end > 0) {
command = args.substr(0, end);
args = args.substr(end + 1);
} else {
args = '';
}
}
one(pid, ppid, command, args, date);
}
}
}));
} else if (process.platform === 'darwin') { // OS X
proc = spawn('/bin/ps', [ '-x', '-o', `pid,ppid,comm=${'a'.repeat(256)},command` ]);
proc.stdout.setEncoding('utf8');
proc.stdout.on('data', lines(line => {
const pid = Number(line.substr(0, 5));
const ppid = Number(line.substr(6, 5));
const command = line.substr(12, 256).trim();
const args = line.substr(269 + command.length);
if (!isNaN(pid) && !isNaN(ppid)) {
one(pid, ppid, command, args);
}
}));
} else { // linux
proc = spawn('/bin/ps', [ '-ax', '-o', 'pid:6,ppid:6,comm:20,command' ]); // we specify the column width explicitly
proc.stdout.setEncoding('utf8');
proc.stdout.on('data', lines(line => {
// the following substr arguments must match the column width specified for the "ps" command above
// regular substr is deprecated
const pid = Number(substr(line, 0, 6));
const ppid = Number(substr(line, 7, 6));
const shortName = substr(line, 14, 20).trim()
const fullCommand = substr(line, 35)
let command = shortName;
let args = fullCommand;
const pos = fullCommand.indexOf(shortName);
if (pos >= 0) {
// binaries with spaces in path may not work
// possible solution to read directly from /proc
const commandEndPositionMaybe = fullCommand.indexOf(" ", pos + shortName.length);
const commandEndPosition = commandEndPositionMaybe < 0 ? fullCommand.length : commandEndPositionMaybe;
command = fullCommand.substring(0, commandEndPosition)
args = fullCommand.substring(commandEndPosition).trimStart()
}
if (!isNaN(pid) && !isNaN(ppid)) {
one(pid, ppid, command, args);
}
}));
}
proc.on('error', err => {
reject(err);
});
proc.stderr.setEncoding('utf8');
proc.stderr.on('data', data => {
const e = data.toString();
if (e.indexOf('screen size is bogus') >= 0) {
// ignore this error silently; see https://github.com/microsoft/vscode/issues/75932
} else {
reject(new Error(data.toString()));
}
});
proc.on('close', (code, signal) => {
if (code === 0) {
resolve();
} else if (code !== null && code > 0) {
reject(new Error(`process terminated with exit code: ${code}`));
}
if (signal) {
reject(new Error(`process terminated with signal: ${signal}`));
}
});
proc.on('exit', (code, signal) => {
if (typeof code === 'number') {
if (code === 0) {
//resolve();
} else if (code > 0) {
reject(new Error(`process terminated with exit code: ${code}`));
}
}
if (signal) {
reject(new Error(`process terminated with signal: ${signal}`));
}
});
});
}
function substr(str: string, startIndex: number, length?: number) {
return str.slice(startIndex, length != undefined ? startIndex + length : str.length)
}