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backend/node_modules/tree-kill/index.js

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+'use strict';
+
+var childProcess = require('child_process');
+var spawn = childProcess.spawn;
+var exec = childProcess.exec;
+
+module.exports = function (pid, signal, callback) {
+    if (typeof signal === 'function' && callback === undefined) {
+        callback = signal;
+        signal = undefined;
+    }
+
+    pid = parseInt(pid);
+    if (Number.isNaN(pid)) {
+        if (callback) {
+            return callback(new Error("pid must be a number"));
+        } else {
+            throw new Error("pid must be a number");
+        }
+    }
+
+    var tree = {};
+    var pidsToProcess = {};
+    tree[pid] = [];
+    pidsToProcess[pid] = 1;
+
+    switch (process.platform) {
+    case 'win32':
+        exec('taskkill /pid ' + pid + ' /T /F', callback);
+        break;
+    case 'darwin':
+        buildProcessTree(pid, tree, pidsToProcess, function (parentPid) {
+          return spawn('pgrep', ['-P', parentPid]);
+        }, function () {
+            killAll(tree, signal, callback);
+        });
+        break;
+    // case 'sunos':
+    //     buildProcessTreeSunOS(pid, tree, pidsToProcess, function () {
+    //         killAll(tree, signal, callback);
+    //     });
+    //     break;
+    default: // Linux
+        buildProcessTree(pid, tree, pidsToProcess, function (parentPid) {
+          return spawn('ps', ['-o', 'pid', '--no-headers', '--ppid', parentPid]);
+        }, function () {
+            killAll(tree, signal, callback);
+        });
+        break;
+    }
+};
+
+function killAll (tree, signal, callback) {
+    var killed = {};
+    try {
+        Object.keys(tree).forEach(function (pid) {
+            tree[pid].forEach(function (pidpid) {
+                if (!killed[pidpid]) {
+                    killPid(pidpid, signal);
+                    killed[pidpid] = 1;
+                }
+            });
+            if (!killed[pid]) {
+                killPid(pid, signal);
+                killed[pid] = 1;
+            }
+        });
+    } catch (err) {
+        if (callback) {
+            return callback(err);
+        } else {
+            throw err;
+        }
+    }
+    if (callback) {
+        return callback();
+    }
+}
+
+function killPid(pid, signal) {
+    try {
+        process.kill(parseInt(pid, 10), signal);
+    }
+    catch (err) {
+        if (err.code !== 'ESRCH') throw err;
+    }
+}
+
+function buildProcessTree (parentPid, tree, pidsToProcess, spawnChildProcessesList, cb) {
+    var ps = spawnChildProcessesList(parentPid);
+    var allData = '';
+    ps.stdout.on('data', function (data) {
+        var data = data.toString('ascii');
+        allData += data;
+    });
+
+    var onClose = function (code) {
+        delete pidsToProcess[parentPid];
+
+        if (code != 0) {
+            // no more parent processes
+            if (Object.keys(pidsToProcess).length == 0) {
+                cb();
+            }
+            return;
+        }
+
+        allData.match(/\d+/g).forEach(function (pid) {
+          pid = parseInt(pid, 10);
+          tree[parentPid].push(pid);
+          tree[pid] = [];
+          pidsToProcess[pid] = 1;
+          buildProcessTree(pid, tree, pidsToProcess, spawnChildProcessesList, cb);
+        });
+    };
+
+    ps.on('close', onClose);
+}