Update to PEP 3143 from Ben.

pep-3143.txt

@@ -210,8 +210,6 @@ The following options are defined.
     actually defined in the ``signal`` module will appear in the
     default map:
 
-    * ``signal.SIGCLD``: ``None``
-
     * ``signal.SIGTTIN``: ``None``
 
     * ``signal.SIGTTOU``: ``None``
@@ -220,6 +218,13 @@ The following options are defined.
 
     * ``signal.SIGTERM``: ``'terminate'``
 
+    Depending on how the program will interact with its child
+    processes, it may need to specify a signal map that includes the
+    ``signal.SIGCHLD`` signal (received when a child process exits).
+    See the specific operating system's documentation for more detail
+    on how to determine what circumstances dictate the need for signal
+    handlers.
+
 `uid`
     :Default: ``os.getuid()``
 
@@ -271,6 +276,10 @@ The following methods are defined.
     Open the daemon context, turning the current program into a daemon
     process. This performs the following steps:
 
+    * If this instance's `is_open` property is true, return
+      immediately. This makes it safe to call `open` multiple times on
+      an instance.
+
     * If the `prevent_core` attribute is true, set the resource limits
       for the process to prevent any core dump from the process.
 
@@ -312,6 +321,9 @@ The following methods are defined.
     * If the `pidfile` attribute is not ``None``, enter its context
       manager.
 
+    * Mark this instance as open (for the purpose of future `open` and
+      `close` calls).
+
     * Register the `close` method to be called during Python's exit
       processing.
 
@@ -321,11 +333,26 @@ The following methods are defined.
 `close()`
     :Return: ``None``
 
-    Close the daemon context. This performs the following step:
+    Close the daemon context. This performs the following steps:
+
+    * If this instance's `is_open` property is false, return
+      immediately. This makes it safe to call `close` multiple times
+      on an instance.
 
     * If the `pidfile` attribute is not ``None``, exit its context
       manager.
 
+    * Mark this instance as closed (for the purpose of future `open`
+      and `close` calls).
+
+`is_open`
+    :Return: ``True`` if the instance is open, ``False`` otherwise.
+
+    This property exposes the state indicating whether the instance is
+    currently open. It is ``True`` if the instance's `open` method has
+    been called and the `close` method has not subsequently been
+    called.
+
 `terminate(signal_number, stack_frame)`
     :Return: ``None``
 
@@ -577,9 +604,5 @@ rights and freedoms that would otherwise be restricted by copyright.
     Local variables:
     mode: rst
     coding: utf-8
-    time-stamp-start: "^Last-Modified:[         ]+\$Date: "
-    time-stamp-end: " \$$"
-    time-stamp-line-limit: 20
-    time-stamp-format: "%:y-%02m-%02d %02H:%02M"
     End:
     vim: filetype=rst fileencoding=utf-8 :