Ignore SIGTTOU.

server/autoserv

 #!/usr/bin/python -u
 # Copyright 2007-2008 Martin J. Bligh <mbligh@google.com>, Google Inc.
 # Released under the GPL v2
 
 """
 Run an control file through the server side engine
 """
 
 import sys, os, re, traceback, signal, time, logging, getpass
 
@@ skipping 35 matching lines @@
 
     # Implement SIGTERM handler
     def handle_sigterm(signum, frame):
         if pid_file_manager:
             pid_file_manager.close_file(1, signal.SIGTERM)
         os.killpg(os.getpgrp(), signal.SIGKILL)
 
     # Set signal handler
     signal.signal(signal.SIGTERM, handle_sigterm)
 
+    # Ignore SIGTTOU's generated by output from forked children.
+    signal.signal(signal.SIGTTOU, signal.SIG_IGN)
+
     # Server side tests that call shell scripts often depend on $USER being set
     # but depending on how you launch your autotest scheduler it may not be set.
     os.environ['USER'] = getpass.getuser()
 
     if parser.options.machines:
         machines = parser.options.machines.replace(',', ' ').strip().split()
     else:
         machines = []
     machines_file = parser.options.machines_file
     label = parser.options.label
@@ skipping 163 matching lines @@
             # an 'abort' and return 1.
             exit_code = 1
     finally:
         if pid_file_manager:
             pid_file_manager.close_file(exit_code)
     sys.exit(exit_code)
 
 
 if __name__ == '__main__':
     main()