Add third_party/pexpect

third_party/pexpect/tests/platform_checks/check_signals.py

Index: third_party/pexpect/tests/platform_checks/check_signals.py
diff --git a/third_party/pexpect/tests/platform_checks/check_signals.py b/third_party/pexpect/tests/platform_checks/check_signals.py
new file mode 100644
index 0000000000000000000000000000000000000000..d45bc8a3bd404672a4e9add4c34f73ced7be857d
--- /dev/null
+++ b/third_party/pexpect/tests/platform_checks/check_signals.py
@@ -0,0 +1,67 @@
+#!/usr/bin/env python
+import signal
+import os
+import time
+import pty
+import sys
+GLOBAL_SIGCHLD_RECEIVED = 0
+
+def signal_handler (signum, frame):
+    print '<HANDLER>'
+    global GLOBAL_SIGCHLD_RECEIVED
+    status = os.waitpid (-1, os.WNOHANG)
+    print 'WIFEXITED(status):', os.WIFEXITED(status)
+    print 'WEXITSTATUS(status):', os.WEXITSTATUS(status) 
+    GLOBAL_SIGCHLD_RECEIVED = 1
+
+def main ():
+#	sig_test ('SIG_IGN', 'ptyfork', 'yes')
+	sig_test ('handler', 'ptyfork', 'yes')
+#	sig_test ('SIG_IGN', 'ptyfork', 'no')
+#	sig_test ('handler', 'ptyfork', 'no')
+#	sig_test ('SIG_IGN', 'osfork', 'yes')
+#	sig_test ('handler', 'osfork', 'yes')
+#	sig_test ('SIG_IGN', 'osfork', 'no')
+#	sig_test ('handler', 'osfork', 'no')
+
+def sig_test (sig_handler_type, fork_type, child_output):
+	print 'Testing with:'
+	print '\tsig_handler_type:', sig_handler_type
+	print '\tfork_type:', fork_type
+	print '\tchild_output:', child_output
+
+	if sig_handler_type == 'SIG_IGN':
+		signal.signal (signal.SIGCHLD, signal.SIG_IGN)
+	else:
+		signal.signal (signal.SIGCHLD, signal_handler)
+	pid = -1
+	fd = -1
+	if fork_type == 'ptyfork':
+		pid, fd = pty.fork()
+	else:
+		pid = os.fork()
+
+	if pid == 0:
+		if child_output == 'yes':
+			os.write (sys.stdout.fileno(), 'This is a test.\nThis is a test.')
+		time.sleep(10000)
+
+	#print 'Sending SIGKILL to child pid:', pid
+	time.sleep(2)
+	os.kill (pid, signal.SIGKILL)
+
+	#print 'Entering to sleep...'
+	try:
+		time.sleep(2)
+	except:
+		pass
+	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
+
+if __name__ == '__main__':
+	main ()