diff -ur Python-2.6.1.orig/configure.in Python-2.6.1-res/configure.in
--- Python-2.6.1.orig/configure.in	2008-11-16 02:02:56.000000000 -0600
+++ Python-2.6.1-res/configure.in	2009-09-16 16:13:56.148979072 -0500
@@ -2448,12 +2448,13 @@
 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 mkfifo mknod mktime \
  mremap nice pathconf pause plock poll pthread_init \
  putenv readlink realpath \
  select setegid seteuid setgid \
- setlocale setregid setreuid setsid setpgid setpgrp setuid setvbuf snprintf \
+ setlocale setregid setreuid setresuid setresgid \
+ setsid setpgid setpgrp setuid setvbuf snprintf \
  sigaction siginterrupt sigrelse strftime \
  sysconf tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
  truncate uname unsetenv utimes waitpid wait3 wait4 wcscoll _getpty)
diff -ur Python-2.6.1.orig/Modules/posixmodule.c Python-2.6.1-res/Modules/posixmodule.c
--- Python-2.6.1.orig/Modules/posixmodule.c	2008-10-09 13:06:58.000000000 -0500
+++ Python-2.6.1-res/Modules/posixmodule.c	2009-09-16 16:20:31.614544286 -0500
@@ -8301,6 +8301,88 @@
 }
 #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)
+{
+	int ruid, euid, suid;
+        if (!PyArg_ParseTuple(args, "iii", &ruid, &euid, &suid)) {
+        	return NULL;
+        } else if (setresuid(ruid, euid, suid) < 0) {
+        	return posix_error();
+        } else {
+        	Py_INCREF(Py_None);
+        	return Py_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)
+{
+	int rgid, egid, sgid;
+        if (!PyArg_ParseTuple(args, "iii", &rgid, &egid, &sgid)) {
+        	return NULL;
+        } else if (setresgid(rgid, egid, sgid) < 0) {
+        	return posix_error();
+        } else {
+        	Py_INCREF(Py_None);
+        	return Py_None;
+        }
+}
+#endif
+
+#ifdef HAVE_GETRESUID
+PyDoc_STRVAR(posix_getresuid__doc__,
+"getresuid() -> (ruid, euid, sgid)\n\n\
+Get tuple of the current process's real, effective, and saved user ids.");
+
+static PyObject*
+posix_getresuid (PyObject *self, PyObject *noargs)
+{
+	int ruid, euid, suid;
+        n = getresuid(&ruid, &euid, &suid);
+        if (n < 0)
+        	posix_error();
+        } else {
+	        return PyTuple_Pack(3,
+                                    PyInt_FromLong((long)ruid),
+                                    PyInt_FromLong((long)euid),
+                                    PyInt_FromLong((long)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)
+{
+	int rgid, egid, sgid;
+        n = getresgid(&rgid, &egid, &sgid);
+        if (n < 0)
+        	posix_error();
+        } else {
+	        return PyTuple_Pack(3,
+                                    PyInt_FromLong((long)rgid),
+                                    PyInt_FromLong((long)egid),
+                                    PyInt_FromLong((long)sgid));
+        }
+}
+#endif
+
 static PyMethodDef posix_methods[] = {
 	{"access",	posix_access, METH_VARARGS, posix_access__doc__},
 #ifdef HAVE_TTYNAME
@@ -8611,6 +8693,19 @@
  #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_VARARGS, posix_getresuid__doc__),
+#endif
+#ifdef HAVE_GETRESGID
+        {"getresgid",	posix_getresgid, METH_VARARGS, posix_getresgid__doc__),
+#endif
+
 	{NULL,		NULL}		 /* Sentinel */
 };