Add third_party/pexpect

third_party/pexpect/tests/platform_checks/check_handler.py

+#!/usr/bin/env python
+import signal
+import os
+import time
+import pty
+import sys
+import fcntl
+import tty
+GLOBAL_SIGCHLD_RECEIVED = 0
+                                                                                 
+def nonblock (fd):                                                           
+        # if O_NDELAY is set read() returns 0 (ambiguous with EOF).
+        # if O_NONBLOCK is set read() returns -1 and sets errno to EAGAIN
+        original_flags = fcntl.fcntl (fd, fcntl.F_GETFL, 0)
+        flags = original_flags | os.O_NONBLOCK
+        fcntl.fcntl(fd, fcntl.F_SETFL, flags)
+        return original_flags
+
+def signal_handler (signum, frame):
+        print '<HANDLER>'
+        global GLOBAL_SIGCHLD_RECEIVED
+        status = os.waitpid (-1, os.WNOHANG)
+        if status[0] == 0:
+                print 'No process for waitpid:', status
+        else:
+                print 'Status:', status
+        print 'WIFEXITED(status):', os.WIFEXITED(status[1])
+        print 'WEXITSTATUS(status):', os.WEXITSTATUS(status[1]) 
+        GLOBAL_SIGCHLD_RECEIVED = 1
+
+def main ():
+        signal.signal (signal.SIGCHLD, signal_handler)
+        pid, fd = pty.fork()
+        if pid == 0:
+                os.write (sys.stdout.fileno(), 'This is a test.\nThis is a test.')
+                time.sleep(10000)
+        nonblock (fd)
+        tty.setraw(fd) #STDIN_FILENO)
+        print 'Sending SIGKILL to child pid:', pid
+        time.sleep(2)
+        os.kill (pid, signal.SIGKILL)
+
+        print 'Entering to sleep...'
+        try:
+                time.sleep(2)
+        except:
+                print 'Sleep interrupted'
+        try:
+                os.kill(pid, 0)
+                print '\tChild is alive. This is ambiguous because it may be a Zombie.'
+        except OSError as e:
+                print '\tChild appears to be dead.'
+#               print str(e)
+        print
+        print 'Reading from master fd:', os.read (fd, 1000)
+
+
+
+if __name__ == '__main__':
+        main ()