From 7180d4878114f8e427764b29a781b7c0a7e1f2dc Mon Sep 17 00:00:00 2001
From: Ronald Oussoren <ronaldoussoren@mac.com>
Date: Fri, 23 Jul 2010 12:36:59 +0000
Subject: [PATCH] Merged revisions 83075 via svnmerge from
 svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r83075 | ronald.oussoren | 2010-07-23 12:54:59 +0100 (Fri, 23 Jul 2010) | 5 lines

  Fix for issue 7895. Avoid crashing the interpreter
  when calling platform.mac_ver after calling os.fork by
  reading from a system configuration file instead of
  using OSX APIs.
........
---
 Lib/platform.py           | 61 ++++++++++++++++++++++++++++++++-------
 Lib/test/test_platform.py | 19 ++++++++++++
 Misc/NEWS                 |  2 ++
 3 files changed, 71 insertions(+), 11 deletions(-)

diff --git a/Lib/platform.py b/Lib/platform.py
index be49f8925a7..64025a3acb5 100755
--- a/Lib/platform.py
+++ b/Lib/platform.py
@@ -696,27 +696,19 @@ def _bcd2str(bcd):
 
     return hex(bcd)[2:]
 
-def mac_ver(release='',versioninfo=('','',''),machine=''):
-
-    """ Get MacOS version information and return it as tuple (release,
-        versioninfo, machine) with versioninfo being a tuple (version,
-        dev_stage, non_release_version).
-
-        Entries which cannot be determined are set to the paramter values
-        which default to ''. All tuple entries are strings.
-
+def _mac_ver_gestalt():
+    """
         Thanks to Mark R. Levinson for mailing documentation links and
         code examples for this function. Documentation for the
         gestalt() API is available online at:
 
            http://www.rgaros.nl/gestalt/
-
     """
     # Check whether the version info module is available
     try:
         import _gestalt
     except ImportError:
-        return release,versioninfo,machine
+        return None
     # Get the infos
     sysv, sysa = _mac_ver_lookup(('sysv','sysa'))
     # Decode the infos
@@ -740,6 +732,53 @@ def mac_ver(release='',versioninfo=('','',''),machine=''):
         machine = {0x1: '68k',
                    0x2: 'PowerPC',
                    0xa: 'i386'}.get(sysa,'')
+
+    return release,versioninfo,machine
+
+def _mac_ver_xml():
+    fn = '/System/Library/CoreServices/SystemVersion.plist'
+    if not os.path.exists(fn):
+        return None
+
+    try:
+        import plistlib
+    except ImportError:
+        return None
+
+    pl = plistlib.readPlist(fn)
+    release = pl['ProductVersion']
+    versioninfo=('', '', '')
+    machine = os.uname()[4]
+    if machine == 'ppc':
+        # for compatibility with the gestalt based code
+        machine = 'PowerPC'
+
+    return release,versioninfo,machine
+
+
+def mac_ver(release='',versioninfo=('','',''),machine=''):
+
+    """ Get MacOS version information and return it as tuple (release,
+        versioninfo, machine) with versioninfo being a tuple (version,
+        dev_stage, non_release_version).
+
+        Entries which cannot be determined are set to the paramter values
+        which default to ''. All tuple entries are strings.
+    """
+
+    # First try reading the information from an XML file which should
+    # always be present
+    info = _mac_ver_xml()
+    if info is not None:
+        return info
+
+    # If that doesn't work for some reason fall back to reading the
+    # information using gestalt calls.
+    info = _mac_ver_gestalt()
+    if info is not None:
+        return info
+
+    # If that also doesn't work return the default values
     return release,versioninfo,machine
 
 def _java_getprop(name,default):
diff --git a/Lib/test/test_platform.py b/Lib/test/test_platform.py
index af371856862..466cbe37ea0 100644
--- a/Lib/test/test_platform.py
+++ b/Lib/test/test_platform.py
@@ -167,6 +167,25 @@ class PlatformTest(unittest.TestCase):
             else:
                 self.assertEquals(res[2], 'PowerPC')
 
+
+    @unittest.skipUnless(sys.platform == 'darwin', "OSX only test")
+    def test_mac_ver_with_fork(self):
+        # Issue7895: platform.mac_ver() crashes when using fork without exec
+        #
+        # This test checks that the fix for that issue works.
+        #
+        pid = os.fork()
+        if pid == 0:
+            # child
+            info = platform.mac_ver()
+            os._exit(0)
+
+        else:
+            # parent
+            cpid, sts = os.waitpid(pid, 0)
+            self.assertEquals(cpid, pid)
+            self.assertEquals(sts, 0)
+
     def test_dist(self):
         res = platform.dist()
 
diff --git a/Misc/NEWS b/Misc/NEWS
index 5c25c6cacac..4756dafea83 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -78,6 +78,8 @@ C-API
 Library
 -------
 
+- Issue #7895: platform.mac_ver() no longer crashes after calling os.fork()
+
 - Issue #9323: Fixed a bug in trace.py that resulted in loosing the
   name of the script being traced.  Patch by Eli Bendersky.