'Initialize data structures.'

def __init__(self):

    self.actions = []
    self.closed = []
    self.pipeCount = 0
    self.O_RDWR = (-1)
    self.O_NOCTTY = (-2)
    self.WNOHANG = (-4)
    self.WEXITSTATUS = (lambda x: 0)
    self.WIFEXITED = (lambda x: 1)
    self.seteuidCalls = []
    self.setegidCalls = []
