1 files changed, 47 insertions, 0 deletions
diff --git a/node_modules/pidtree/lib/ps.js b/node_modules/pidtree/lib/ps.js
new file mode 100644
index 0000000..6d9bb5f
--- /dev/null
+++ b/node_modules/pidtree/lib/ps.js
@@ -0,0 +1,47 @@
+'use strict';
+
+var os = require('os');
+var bin = require('./bin');
+
+/**
+ * Gets the list of all the pids of the system through the ps command.
+ * @param  {Function} callback(err, list)
+ */
+function ps(callback) {
+  var args = ['-A', '-o', 'ppid,pid'];
+
+  bin('ps', args, function(err, stdout, code) {
+    if (err) return callback(err);
+    if (code !== 0) {
+      return callback(new Error('pidtree ps command exited with code ' + code));
+    }
+
+    // Example of stdout
+    //
+    // PPID   PID
+    //    1   430
+    //  430   432
+    //    1   727
+    //    1  7166
+
+    try {
+      stdout = stdout.split(os.EOL);
+
+      var list = [];
+      for (var i = 1; i < stdout.length; i++) {
+        stdout[i] = stdout[i].trim();
+        if (!stdout[i]) continue;
+        stdout[i] = stdout[i].split(/\s+/);
+        stdout[i][0] = parseInt(stdout[i][0], 10); // PPID
+        stdout[i][1] = parseInt(stdout[i][1], 10); // PID
+        list.push(stdout[i]);
+      }
+
+      callback(null, list);
+    } catch (error) {
+      callback(error);
+    }
+  });
+}
+
+module.exports = ps;