Add third_party/pexpect

third_party/pexpect/tests/platform_checks/check_handler.py

Index: third_party/pexpect/tests/platform_checks/check_handler.py
diff --git a/third_party/pexpect/tests/platform_checks/check_handler.py b/third_party/pexpect/tests/platform_checks/check_handler.py
new file mode 100644
index 0000000000000000000000000000000000000000..c0633eb80e066a2c10a7f9502ac45c2b0e5c5f8e
--- /dev/null
+++ b/third_party/pexpect/tests/platform_checks/check_handler.py
@@ -0,0 +1,60 @@
+#!/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 ()