diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index c64c5ad..588a752 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -196,6 +196,19 @@
 
    Return the parent's process id. Availability: Unix.
 
+.. function:: getresgid()
+
+   Return a tuple (ruid, euid, suid) denoting the current process's
+   real, effective, and saved user ids. Availability: Unix.
+
+   .. versionadded:: 2.7/3.2
+
+.. function:: getresuid()
+
+   Return a tuple (rgid, egid, sgid) denoting the current process's
+   real, effective, and saved user ids. Availability: Unix.
+
+   .. versionadded:: 2.7/3.2
 
 .. function:: getuid()
 
@@ -267,15 +280,28 @@
    for the semantics. Availability: Unix.
 
 
-.. function:: setreuid(ruid, euid)
-
-   Set the current process's real and effective user ids. Availability: Unix.
-
-
 .. function:: setregid(rgid, egid)
 
    Set the current process's real and effective group ids. Availability: Unix.
 
+.. function:: setresgid(rgid, egid, sgid)
+
+   Set the current process's real, effective, and saved group ids.
+   Availability: Unix.
+
+   .. versionadded:: 2.7/3.2
+
+.. function:: setresuid(ruid, euid, suid)
+
+   Set the current process's real, effective, and saved user ids.
+   Availibility: Unix.
+
+   .. versionadded:: 2.7/3.2
+
+.. function:: setreuid(ruid, euid)
+
+   Set the current process's real and effective user ids. Availability: Unix.
+
 
 .. function:: getsid(pid)
 
diff --git a/Lib/test/test_posix.py b/Lib/test/test_posix.py
index 2047e52..f3edf33 100644
--- a/Lib/test/test_posix.py
+++ b/Lib/test/test_posix.py
@@ -40,6 +40,48 @@
                 posix_func()
                 self.assertRaises(TypeError, posix_func, 1)
 
+    if hasattr(posix, 'getresuid'):
+        def test_getresuid(self):
+            user_ids = posix.getresuid()
+            self.assertEqual(len(user_ids), 3)
+            for val in user_ids:
+                self.assertGreaterEqual(val, 0)
+
+    if hasattr(posix, 'getresgid'):
+        def test_getresgid(self):
+            group_ids = posix.getresgid()
+            self.assertEqual(len(group_ids), 3)
+            for val in group_ids:
+                self.assertGreaterEqual(val, 0)
+
+    if hasattr(posix, 'setresuid'):
+        def test_setresuid(self):
+            current_user_ids = posix.getresuid()
+            self.assertIsNone(posix.setresuid(*current_user_ids))
+            # -1 means don't change that value.
+            self.assertIsNone(posix.setresuid(-1, -1, -1))
+
+        def test_setresuid_exception(self):
+            # Don't do this test if someone is silly enough to run us as root.
+            current_user_ids = posix.getresuid()
+            if 0 not in current_user_ids:
+                new_user_ids = (current_user_ids[0]+1, -1, -1)
+                self.assertRaises(OSError, posix.setresuid, *new_user_ids)
+
+    if hasattr(posix, 'setresgid'):
+        def test_setresgid(self):
+            current_group_ids = posix.getresgid()
+            self.assertIsNone(posix.setresgid(*current_group_ids))
+            # -1 means don't change that value.
+            self.assertIsNone(posix.setresgid(-1, -1, -1))
+
+        def test_setresgid_exception(self):
+            # Don't do this test if someone is silly enough to run us as root.
+            current_group_ids = posix.getresgid()
+            if 0 not in current_group_ids:
+                new_group_ids = (current_group_ids[0]+1, -1, -1)
+                self.assertRaises(OSError, posix.setresgid, *new_group_ids)
+
     def test_statvfs(self):
         if hasattr(posix, 'statvfs'):
             self.assertTrue(posix.statvfs(os.curdir))
diff --git a/Misc/NEWS b/Misc/NEWS
index 1cff0b7..4ca20ed 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -388,6 +388,8 @@
 Extension Modules
 -----------------
 
+- Issue #6508: Add posix.{getresuid,getresgid,setresuid,setresgid}.
+
 - Issue #7078: Set struct.__doc__ from _struct.__doc__.
 
 - Issue #3366: Add gamma function to math module.
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 22b637e..eaf5b40 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -6953,6 +6953,82 @@
 }
 #endif
 
+#ifdef HAVE_SETRESUID
+PyDoc_STRVAR(posix_setresuid__doc__,
+"setresuid(ruid, euid, suid)\n\n\
+Set the current process's real, effective, and saved user ids.");
+
+static PyObject*
+posix_setresuid (PyObject *self, PyObject *args)
+{
+	/* We assume uid_t is no larger than a long. */
+	long ruid, euid, suid;
+	if (!PyArg_ParseTuple(args, "lll", &ruid, &euid, &suid))
+		return NULL;
+	if (setresuid(ruid, euid, suid) < 0)
+		return posix_error();
+	Py_RETURN_NONE;
+}
+#endif
+
+#ifdef HAVE_SETRESGID
+PyDoc_STRVAR(posix_setresgid__doc__,
+"setresgid(rgid, egid, sgid)\n\n\
+Set the current process's real, effective, and saved group ids.");
+
+static PyObject*
+posix_setresgid (PyObject *self, PyObject *args)
+{
+	/* We assume uid_t is no larger than a long. */
+	long rgid, egid, sgid;
+	if (!PyArg_ParseTuple(args, "lll", &rgid, &egid, &sgid))
+		return NULL;
+	if (setresgid(rgid, egid, sgid) < 0)
+		return posix_error();
+	Py_RETURN_NONE;
+}
+#endif
+
+#ifdef HAVE_GETRESUID
+PyDoc_STRVAR(posix_getresuid__doc__,
+"getresuid() -> (ruid, euid, suid)\n\n\
+Get tuple of the current process's real, effective, and saved user ids.");
+
+static PyObject*
+posix_getresuid (PyObject *self, PyObject *noargs)
+{
+	uid_t ruid, euid, suid;
+	long l_ruid, l_euid, l_suid;
+	if (getresuid(&ruid, &euid, &suid) < 0)
+		return posix_error();
+	/* Force the values into long's as we don't know the size of uid_t. */
+	l_ruid = ruid;
+	l_euid = euid;
+	l_suid = suid;
+	return Py_BuildValue("(lll)", l_ruid, l_euid, l_suid);
+}
+#endif
+
+#ifdef HAVE_GETRESGID
+PyDoc_STRVAR(posix_getresgid__doc__,
+"getresgid() -> (rgid, egid, sgid)\n\n\
+Get tuple of the current process's real, effective, and saved user ids.");
+
+static PyObject*
+posix_getresgid (PyObject *self, PyObject *noargs)
+{
+	uid_t rgid, egid, sgid;
+	long l_rgid, l_egid, l_sgid;
+	if (getresgid(&rgid, &egid, &sgid) < 0)
+		return posix_error();
+	/* Force the values into long's as we don't know the size of uid_t. */
+	l_rgid = rgid;
+	l_egid = egid;
+	l_sgid = sgid;
+	return Py_BuildValue("(lll)", l_rgid, l_egid, l_sgid);
+}
+#endif
+
 static PyMethodDef posix_methods[] = {
 	{"access",	posix_access, METH_VARARGS, posix_access__doc__},
 #ifdef HAVE_TTYNAME
@@ -7242,6 +7318,19 @@
  #ifdef __VMS
  	{"urandom", vms_urandom, METH_VARARGS, vms_urandom__doc__},
  #endif
+#ifdef HAVE_SETRESUID
+        {"setresuid",	posix_setresuid, METH_VARARGS, posix_setresuid__doc__},
+#endif
+#ifdef HAVE_SETRESGID
+        {"setresgid",	posix_setresgid, METH_VARARGS, posix_setresgid__doc__},
+#endif
+#ifdef HAVE_GETRESUID
+        {"getresuid",	posix_getresuid, METH_NOARGS, posix_getresuid__doc__},
+#endif
+#ifdef HAVE_GETRESGID
+        {"getresgid",	posix_getresgid, METH_NOARGS, posix_getresgid__doc__},
+#endif
+
 	{NULL,		NULL}		 /* Sentinel */
 };
 
diff --git a/configure b/configure
index c42b514..69ad375 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Revision: 76328 .
+# From configure.in Revision: 76405 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61 for python 3.2.
 #
@@ -3800,7 +3800,7 @@
   { echo "$as_me:$LINENO: result: no" >&5
 echo "${ECHO_T}no" >&6; }
 fi
-rm -f -r conftest*
+rm -f conftest*
 
 
 
@@ -5338,7 +5338,7 @@
 else
   ac_cv_header_stdc=no
 fi
-rm -f -r conftest*
+rm -f conftest*
 
 fi
 
@@ -5359,7 +5359,7 @@
 else
   ac_cv_header_stdc=no
 fi
-rm -f -r conftest*
+rm -f conftest*
 
 fi
 
@@ -6457,7 +6457,7 @@
 
 
 fi
-rm -f -r conftest*
+rm -f conftest*
 
 { echo "$as_me:$LINENO: result: $was_it_defined" >&5
 echo "${ECHO_T}$was_it_defined" >&6; }
@@ -6987,7 +6987,7 @@
 else
   ac_cv_type_uid_t=no
 fi
-rm -f -r conftest*
+rm -f conftest*
 
 fi
 { echo "$as_me:$LINENO: result: $ac_cv_type_uid_t" >&5
@@ -15529,7 +15529,7 @@
 else
   unistd_defines_pthreads=no
 fi
-rm -f -r conftest*
+rm -f conftest*
 
     { echo "$as_me:$LINENO: result: $unistd_defines_pthreads" >&5
 echo "${ECHO_T}$unistd_defines_pthreads" >&6; }
@@ -16827,7 +16827,7 @@
   $EGREP "yes" >/dev/null 2>&1; then
   ipv6type=$i
 fi
-rm -f -r conftest*
+rm -f conftest*
 
 			;;
 		kame)
@@ -16850,7 +16850,7 @@
 				ipv6libdir=/usr/local/v6/lib
 				ipv6trylibc=yes
 fi
-rm -f -r conftest*
+rm -f conftest*
 
 			;;
 		linux-glibc)
@@ -16871,7 +16871,7 @@
   ipv6type=$i;
 				ipv6trylibc=yes
 fi
-rm -f -r conftest*
+rm -f conftest*
 
 			;;
 		linux-inet6)
@@ -16909,7 +16909,7 @@
 				ipv6lib=inet6;
 				ipv6libdir=/usr/local/v6/lib
 fi
-rm -f -r conftest*
+rm -f conftest*
 
 			;;
 		v6d)
@@ -16932,7 +16932,7 @@
 				ipv6libdir=/usr/local/v6/lib;
 				BASECFLAGS="-I/usr/local/v6/include $BASECFLAGS"
 fi
-rm -f -r conftest*
+rm -f conftest*
 
 			;;
 		zeta)
@@ -16954,7 +16954,7 @@
 				ipv6lib=inet6;
 				ipv6libdir=/usr/local/v6/lib
 fi
-rm -f -r conftest*
+rm -f conftest*
 
 			;;
 		esac
@@ -17375,17 +17375,21 @@
 
 
 
+
+
+
+
 for ac_func in alarm setitimer getitimer bind_textdomain_codeset chown \
  clock confstr ctermid execv fchmod fchown fork fpathconf ftime ftruncate \
  gai_strerror getgroups getlogin getloadavg getpeername getpgid getpid \
- getpriority getpwent getspnam getspent getsid getwd \
+ getpriority getresuid getresgid getpwent getspnam getspent getsid getwd \
  kill killpg lchmod lchown lstat mbrtowc mkfifo mknod mktime \
  mremap nice pathconf pause plock poll pthread_init \
  putenv readlink realpath \
  select sem_open sem_timedwait sem_getvalue sem_unlink setegid seteuid \
  setgid \
- setlocale setregid setreuid setsid setpgid setpgrp setuid setvbuf snprintf \
- sigaction siginterrupt sigrelse strftime strlcpy \
+ setlocale setregid setreuid setresuid setresgid setsid setpgid setpgrp setuid setvbuf \
+ sigaction siginterrupt sigrelse snprintf strftime strlcpy \
  sysconf tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
  truncate uname unsetenv utimes waitpid wait3 wait4 \
  wcscoll wcsftime wcsxfrm _getpty
@@ -25044,7 +25048,7 @@
 _ACEOF
 
 fi
-rm -f -r conftest*
+rm -f conftest*
 
   cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
@@ -25063,7 +25067,7 @@
 _ACEOF
 
 fi
-rm -f -r conftest*
+rm -f conftest*
 
 fi
 
@@ -25333,7 +25337,7 @@
 _ACEOF
 
 fi
-rm -f -r conftest*
+rm -f conftest*
 
 fi
 
diff --git a/configure.in b/configure.in
index ac63667..ca9037b 100644
--- a/configure.in
+++ b/configure.in
@@ -2417,14 +2417,14 @@
 AC_CHECK_FUNCS(alarm setitimer getitimer bind_textdomain_codeset chown \
  clock confstr ctermid execv fchmod fchown fork fpathconf ftime ftruncate \
  gai_strerror getgroups getlogin getloadavg getpeername getpgid getpid \
- getpriority getpwent getspnam getspent getsid getwd \
+ getpriority getresuid getresgid getpwent getspnam getspent getsid getwd \
  kill killpg lchmod lchown lstat mbrtowc mkfifo mknod mktime \
  mremap nice pathconf pause plock poll pthread_init \
  putenv readlink realpath \
  select sem_open sem_timedwait sem_getvalue sem_unlink setegid seteuid \
  setgid \
- setlocale setregid setreuid setsid setpgid setpgrp setuid setvbuf snprintf \
- sigaction siginterrupt sigrelse strftime strlcpy \
+ setlocale setregid setreuid setresuid setresgid setsid setpgid setpgrp setuid setvbuf \
+ sigaction siginterrupt sigrelse snprintf strftime strlcpy \
  sysconf tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
  truncate uname unsetenv utimes waitpid wait3 wait4 \
  wcscoll wcsftime wcsxfrm _getpty)
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 223c996..b8404f3 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -314,6 +314,12 @@
 /* Define to 1 if you have the `getpwent' function. */
 #undef HAVE_GETPWENT
 
+/* Define to 1 if you have the `getresgid' function. */
+#undef HAVE_GETRESGID
+
+/* Define to 1 if you have the `getresuid' function. */
+#undef HAVE_GETRESUID
+
 /* Define to 1 if you have the `getsid' function. */
 #undef HAVE_GETSID
 
@@ -578,6 +584,12 @@
 /* Define to 1 if you have the `setregid' function. */
 #undef HAVE_SETREGID
 
+/* Define to 1 if you have the `setresgid' function. */
+#undef HAVE_SETRESGID
+
+/* Define to 1 if you have the `setresuid' function. */
+#undef HAVE_SETRESUID
+
 /* Define to 1 if you have the `setreuid' function. */
 #undef HAVE_SETREUID