105 lines
2.6 KiB
JavaScript
105 lines
2.6 KiB
JavaScript
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'use strict';
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var getAll = require('./get');
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/**
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* Get the list of children and grandchildren pids of the given PID.
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* @param {Number|String} PID A PID. If -1 will return all the pids.
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* @param {Object} [options] Optional options object.
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* @param {Boolean} [options.root=false] Include the provided PID in the list.
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* @param {Boolean} [options.advanced=false] Returns a list of objects in the
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* format {pid: X, ppid: Y}.
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* @param {Function} callback(err, list) Called when the list is ready.
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*/
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function list(PID, options, callback) {
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if (typeof options === 'function') {
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callback = options;
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options = {};
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}
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if (typeof options !== 'object') {
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options = {};
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}
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PID = parseInt(PID, 10);
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if (isNaN(PID) || PID < -1) {
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callback(new TypeError('The pid provided is invalid'));
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return;
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}
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getAll(function(err, list) {
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if (err) {
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callback(err);
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return;
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}
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// If the user wants the whole list just return it
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if (PID === -1) {
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for (var i = 0; i < list.length; i++) {
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list[i] = options.advanced
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? {ppid: list[i][0], pid: list[i][1]}
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: (list[i] = list[i][1]);
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}
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callback(null, list);
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return;
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}
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var root;
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for (var l = 0; l < list.length; l++) {
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if (list[l][1] === PID) {
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root = options.advanced ? {ppid: list[l][0], pid: PID} : PID;
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break;
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}
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if (list[l][0] === PID) {
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root = options.advanced ? {pid: PID} : PID; // Special pids like 0 on *nix
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}
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}
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if (!root) {
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callback(new Error('No maching pid found'));
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return;
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}
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// Build the adiacency Hash Map (pid -> [children of pid])
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var tree = {};
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while (list.length > 0) {
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var element = list.pop();
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if (tree[element[0]]) {
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tree[element[0]].push(element[1]);
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} else {
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tree[element[0]] = [element[1]];
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}
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}
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// Starting by the PID provided by the user, traverse the tree using the
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// adiacency Hash Map until the whole subtree is visited.
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// Each pid encountered while visiting is added to the pids array.
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var idx = 0;
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var pids = [root];
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while (idx < pids.length) {
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var curpid = options.advanced ? pids[idx++].pid : pids[idx++];
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if (!tree[curpid]) continue;
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var length = tree[curpid].length;
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for (var j = 0; j < length; j++) {
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pids.push(
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options.advanced
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? {ppid: curpid, pid: tree[curpid][j]}
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: tree[curpid][j]
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);
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}
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delete tree[curpid];
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}
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if (!options.root) {
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pids.shift(); // Remove root
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}
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callback(null, pids);
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});
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}
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module.exports = list;
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