http://hg.python.org/cpython/rev/2468b58f7fce changeset: 76672:2468b58f7fce branch: 2.7 parent: 76669:55b2258c1c7c user: Ned Deily <nad@acm.org> date: Mon Apr 30 11:13:16 2012 -0700 summary: Issue #10433: Document unique behavior of 'os.getgroups' on Mac OS X. files: Doc/library/os.rst | 18 ++++++++++++++++++ 1 files changed, 18 insertions(+), 0 deletions(-) diff --git a/Doc/library/os.rst b/Doc/library/os.rst --- a/Doc/library/os.rst +++ b/Doc/library/os.rst @@ -157,6 +157,20 @@ Availability: Unix. + .. note:: On Mac OS X, :func:`getgroups` behavior differs somewhat from + other Unix platforms. If the Python interpreter was built with a + deployment target of :const:`10.5` or earlier, :func:`getgroups` returns + the list of effective group ids associated with the current user process; + this list is limited to a system-defined number of entries, typically 16, + and may be modified by calls to :func:`setgroups` if suitably privileged. + If built with a deployment target greater than :const:`10.5`, + :func:`getgroups` returns the current group access list for the user + associated with the effective user id of the process; the group access + list may change over the lifetime of the process, it is not affected by + calls to :func:`setgroups`, and its length is not limited to 16. The + deployment target value, :const:`MACOSX_DEPLOYMENT_TARGET`, can be + obtained with :func:`sysconfig.get_config_var`. + .. function:: initgroups(username, gid) @@ -306,6 +320,10 @@ .. versionadded:: 2.2 + .. note:: On Mac OS X, the length of *groups* may not exceed the + system-defined maximum number of effective group ids, typically 16. + See the documentation for :func:`getgroups` for cases where it may not + return the same group list set by calling setgroups(). .. function:: setpgrp() -- Repository URL: http://hg.python.org/cpython