From: Gregory P. Smith <greg@mad-scientist.com>
Date: Sat, 4 Jul 2009 02:28:47 +0000 (+0000)
Subject: Merged revisions 73818 via svnmerge from
X-Git-Tag: v3.2a1~2889
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=b970b869750ffbd0576153d26e7416e583225f44;p=python

Merged revisions 73818 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r73818 | gregory.p.smith | 2009-07-03 13:48:31 -0700 (Fri, 03 Jul 2009) | 2 lines

  Adds the select.PIPE_BUF attribute to expose the system constant.
........
---

diff --git a/Doc/library/select.rst b/Doc/library/select.rst
index 6dbf16f834..bffb9cba75 100644
--- a/Doc/library/select.rst
+++ b/Doc/library/select.rst
@@ -94,6 +94,15 @@ The module defines the following:
       library, and does not handle file descriptors that don't originate from
       WinSock.
 
+.. attribute:: select.PIPE_BUF
+
+   Files reported as ready for writing by :func:`select`, :func:`poll` or
+   similar interfaces in this module are guaranteed to not block on a write
+   of up to :const:`PIPE_BUF` bytes.
+   This value is guaranteed by POSIX to be at least 512.
+
+   .. versionadded:: 2.7
+
 
 .. _epoll-objects:
 
diff --git a/Modules/selectmodule.c b/Modules/selectmodule.c
index 191296e0d9..085537513b 100644
--- a/Modules/selectmodule.c
+++ b/Modules/selectmodule.c
@@ -1764,6 +1764,8 @@ PyInit_select(void)
 	Py_INCREF(SelectError);
 	PyModule_AddObject(m, "error", SelectError);
 
+	PyModule_AddIntConstant(m, "PIPE_BUF", PIPE_BUF);
+
 #if defined(HAVE_POLL)
 #ifdef __APPLE__
 	if (select_have_broken_poll()) {