Update linux_command_demo.py

Author: xdai555

demo/linux_command_demo.py

@@ -1,4 +1,31 @@
-import subprocess
+from subprocess import Popen, PIPE
+import threading
+import os
+import signal
 
 
-def exec_cmd(cmd, interact=False):...
+# def exec_cmd(cmd, interact=False):...
+
+class Command():
+  """Python 2.7.5 带有超时功能的 subprocess"""
+    status = -1
+    output = error = ""
+
+    def __init__(self):
+        self.process = None
+
+    def run(self, cmd, timeout=60):
+        def target():
+            self.process = Popen(cmd, shell=True, stdin=PIPE,
+                                stderr=PIPE, stdout=PIPE, preexec_fn=os.setsid)
+            self.output, self.error = self.process.communicate()
+            self.output = self.output.strip()
+            self.status = self.process.returncode
+
+        thread = threading.Thread(target=target)
+        thread.start()
+        thread.join(timeout)
+        if thread.is_alive():
+            os.killpg(self.process.pid, signal.SIGTERM)
+            thread.join()
+        return self.status, self.output, self.error